From d5a2859b648471ae9ef60cd08ff185890c8a18a7 Mon Sep 17 00:00:00 2001
From: Lucien Cartier-Tilet <lucien@phundrak.com>
Date: Sun, 21 Dec 2025 18:19:21 +0100
Subject: [PATCH] feat: rust project initialization

---
 .envrc                       |   24 +
 .gitignore                   |   42 +
 .tarpaulin.ci.toml           |    6 +
 .tarpaulin.local.toml        |    7 +
 Cargo.lock                   | 2699 ++++++++++++++++++++++++++++++++++
 Cargo.toml                   |   31 +
 bacon.toml                   |   84 ++
 deny.toml                    |   51 +
 flake.lock                   |  358 +++++
 flake.nix                    |   57 +
 justfile                     |   48 +
 nix/package.nix              |   21 +
 nix/rust-version.nix         |   11 +
 nix/shell.nix                |   49 +
 settings/base.yaml           |    8 +
 settings/development.yaml    |    8 +
 settings/production.yaml     |    8 +
 sonar-project.properties     |    1 +
 src/lib.rs                   |   81 +
 src/main.rs                  |    7 +
 src/middleware/mod.rs        |    5 +
 src/middleware/rate_limit.rs |  208 +++
 src/route/health.rs          |   38 +
 src/route/meta.rs            |   86 ++
 src/route/mod.rs             |   37 +
 src/settings.rs              |  284 ++++
 src/startup.rs               |  227 +++
 src/telemetry.rs             |   69 +
 28 files changed, 4555 insertions(+)
 create mode 100644 .envrc
 create mode 100644 .gitignore
 create mode 100644 .tarpaulin.ci.toml
 create mode 100644 .tarpaulin.local.toml
 create mode 100644 Cargo.lock
 create mode 100644 Cargo.toml
 create mode 100644 bacon.toml
 create mode 100644 deny.toml
 create mode 100644 flake.lock
 create mode 100644 flake.nix
 create mode 100644 justfile
 create mode 100644 nix/package.nix
 create mode 100644 nix/rust-version.nix
 create mode 100644 nix/shell.nix
 create mode 100644 settings/base.yaml
 create mode 100644 settings/development.yaml
 create mode 100644 settings/production.yaml
 create mode 100644 sonar-project.properties
 create mode 100644 src/lib.rs
 create mode 100644 src/main.rs
 create mode 100644 src/middleware/mod.rs
 create mode 100644 src/middleware/rate_limit.rs
 create mode 100644 src/route/health.rs
 create mode 100644 src/route/meta.rs
 create mode 100644 src/route/mod.rs
 create mode 100644 src/settings.rs
 create mode 100644 src/startup.rs
 create mode 100644 src/telemetry.rs

diff --git a/.envrc b/.envrc
new file mode 100644
index 0000000..b9d0f4c
--- /dev/null
+++ b/.envrc
@@ -0,0 +1,24 @@
+#!/usr/bin/env bash
+
+if ! has nix_direnv_version || ! nix_direnv_version 3.1.0; then
+  source_url "https://raw.githubusercontent.com/nix-community/nix-direnv/3.1.0/direnvrc" "sha256-yMJ2OVMzrFaDPn7q8nCBZFRYpL/f0RcHzhmw/i6btJM="
+fi
+
+export DEVENV_IN_DIRENV_SHELL=true
+
+# Load .env file if present
+dotenv_if_exists
+
+watch_file flake.nix
+watch_file flake.lock
+watch_file .envrc.local
+watch_file nix/shell.nix
+
+# Check if .envrc.local exists and contains a shell preference
+if [[ -f .envrc.local ]]; then
+  source .envrc.local
+fi
+
+if ! use flake . --no-pure-eval; then
+  echo "Devenv could not be built. The devenv environment was not loaded. Make the necessary changes to flake.nix and hit enter to try again." >&2
+fi
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..9de1006
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,42 @@
+.temp
+.cache
+.devenv
+
+# Logs
+logs
+*.log
+
+# Misc
+.DS_Store
+.fleet
+.idea
+
+# Local env files
+.env
+.env.*
+!.env.example
+
+# Backend
+target/
+coverage/
+
+# Frontend
+## Nuxt dev/build outputs
+.output
+.data
+.nuxt
+.nitro
+.cache
+dist
+
+## Node dependencies
+node_modules
+
+# Nix
+result
+.data/
+
+
+# Added by cargo
+
+/target
diff --git a/.tarpaulin.ci.toml b/.tarpaulin.ci.toml
new file mode 100644
index 0000000..610e47e
--- /dev/null
+++ b/.tarpaulin.ci.toml
@@ -0,0 +1,6 @@
+[all]
+out = ["Xml"]
+target-dir = "coverage"
+output-dir = "coverage"
+fail-under = 60
+exclude-files = ["target/*"]
diff --git a/.tarpaulin.local.toml b/.tarpaulin.local.toml
new file mode 100644
index 0000000..97443d2
--- /dev/null
+++ b/.tarpaulin.local.toml
@@ -0,0 +1,7 @@
+[all]
+out = ["Html", "Lcov"]
+skip-clean = true
+target-dir = "coverage"
+output-dir = "coverage"
+fail-under = 60
+exclude-files = ["target/*", "private/*"]
diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..a9a55e5
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,2699 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..08e1309
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,31 @@
+[package]
+name = "sta"
+version = "0.1.0"
+edition = "2024"
+publish = false
+authors = ["Lucien Cartier-Tilet <lucien@phundrak.com>"]
+license = "AGPL-3.0-only"
+
+[lib]
+path = "src/lib.rs"
+
+[[bin]]
+path = "src/main.rs"
+name = "sta"
+
+[dependencies]
+chrono = { version = "0.4.42", features = ["serde"] }
+config = { version = "0.15.19", features = ["yaml"] }
+dotenvy = "0.15.7"
+governor = "0.8.1"
+poem = { version = "3.1.12", default-features = false, features = ["csrf", "rustls", "test"] }
+poem-openapi = { version = "5.1.16", features = ["chrono", "swagger-ui"] }
+serde = "1.0.228"
+serde_json = "1.0.148"
+thiserror = "2.0.17"
+tokio = { version = "1.48.0", features = ["macros", "rt-multi-thread"] }
+tracing = "0.1.44"
+tracing-subscriber = { version = "0.3.22", features = ["fmt", "std", "env-filter", "registry", "json", "tracing-log"] }
+
+[lints.rust]
+unexpected_cfgs = { level = "warn", check-cfg = ['cfg(tarpaulin_include)'] }
diff --git a/bacon.toml b/bacon.toml
new file mode 100644
index 0000000..31c1d7a
--- /dev/null
+++ b/bacon.toml
@@ -0,0 +1,84 @@
+# This is a configuration file for the bacon tool
+#
+# Bacon repository: https://github.com/Canop/bacon
+# Complete help on configuration: https://dystroy.org/bacon/config/
+# You can also check bacon's own bacon.toml file
+#  as an example: https://github.com/Canop/bacon/blob/main/bacon.toml
+
+default_job = "clippy-all"
+
+[jobs.check]
+command = ["cargo", "check", "--color", "always"]
+need_stdout = false
+
+[jobs.check-all]
+command = ["cargo", "check", "--all-targets", "--color", "always"]
+need_stdout = false
+
+# Run clippy on the default target
+[jobs.clippy]
+command = [
+    "cargo", "clippy",
+    "--color", "always",
+]
+need_stdout = false
+
+[jobs.clippy-all]
+command = [
+    "cargo", "clippy",
+    "--all-targets",
+    "--color", "always",
+]
+need_stdout = false
+
+[jobs.test]
+command = [
+    "cargo", "test", "--color", "always",
+    "--", "--color", "always", # see https://github.com/Canop/bacon/issues/124
+]
+need_stdout = true
+
+[jobs.doc]
+command = ["cargo", "doc", "--color", "always", "--no-deps"]
+need_stdout = false
+
+# If the doc compiles, then it opens in your browser and bacon switches
+# to the previous job
+[jobs.doc-open]
+command = ["cargo", "doc", "--color", "always", "--no-deps", "--open"]
+need_stdout = false
+on_success = "back" # so that we don't open the browser at each change
+
+# You can run your application and have the result displayed in bacon,
+# *if* it makes sense for this crate.
+# Don't forget the `--color always` part or the errors won't be
+# properly parsed.
+# If your program never stops (eg a server), you may set `background`
+# to false to have the cargo run output immediately displayed instead
+# of waiting for program's end.
+[jobs.run]
+command = [
+    "cargo", "run",
+    "--color", "always",
+    # put launch parameters for your program behind a `--` separator
+]
+need_stdout = true
+allow_warnings = true
+background = true
+
+# This parameterized job runs the example of your choice, as soon
+# as the code compiles.
+# Call it as
+#    bacon ex -- my-example
+[jobs.ex]
+command = ["cargo", "run", "--color", "always", "--example"]
+need_stdout = true
+allow_warnings = true
+
+# You may define here keybindings that would be specific to
+# a project, for example a shortcut to launch a specific job.
+# Shortcuts to internal functions (scrolling, toggling, etc.)
+# should go in your personal global prefs.toml file instead.
+[keybindings]
+# alt-m = "job:my-job"
+c = "job:clippy-all" # comment this to have 'c' run clippy on only the default target
diff --git a/deny.toml b/deny.toml
new file mode 100644
index 0000000..5bcf59b
--- /dev/null
+++ b/deny.toml
@@ -0,0 +1,51 @@
+[output]
+feature-depth = 1
+
+[advisories]
+ignore = [
+  "RUSTSEC-2025-0134"
+]
+
+[licenses]
+# List of explicitly allowed licenses
+# See https://spdx.org/licenses/ for list of possible licenses
+allow = [
+  "AGPL-3.0-only",
+  "Apache-2.0 WITH LLVM-exception",
+  "Apache-2.0",
+  "BSD-3-Clause",
+  "ISC",
+  "MIT",
+  "MPL-2.0",
+  "OpenSSL",
+  "Unicode-3.0",
+  "Zlib",
+]
+confidence-threshold = 0.8
+exceptions = []
+
+[licenses.private]
+ignore = false
+registries = []
+
+[bans]
+multiple-versions = "allow"
+wildcards = "allow"
+highlight = "all"
+workspace-default-features = "allow"
+external-default-features = "allow"
+allow = []
+deny = []
+skip = []
+skip-tree = []
+
+[sources]
+unknown-registry = "deny"
+unknown-git = "deny"
+allow-registry = ["https://github.com/rust-lang/crates.io-index"]
+allow-git = []
+
+[sources.allow-org]
+github = []
+gitlab = []
+bitbucket = []
diff --git a/flake.lock b/flake.lock
new file mode 100644
index 0000000..b49e38f
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,358 @@
+{
+  "nodes": {
+    "alejandra": {
+      "inputs": {
+        "fenix": "fenix",
+        "flakeCompat": "flakeCompat",
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1744324181,
+        "narHash": "sha256-Oi1n2ncF4/AWeY6X55o2FddIRICokbciqFYK64XorYk=",
+        "owner": "kamadorueda",
+        "repo": "alejandra",
+        "rev": "3e2a85506627062313e131bf8a85315f3387c8e0",
+        "type": "github"
+      },
+      "original": {
+        "owner": "kamadorueda",
+        "ref": "4.0.0",
+        "repo": "alejandra",
+        "type": "github"
+      }
+    },
+    "cachix": {
+      "inputs": {
+        "devenv": [
+          "devenv"
+        ],
+        "flake-compat": [
+          "devenv",
+          "flake-compat"
+        ],
+        "git-hooks": [
+          "devenv",
+          "git-hooks"
+        ],
+        "nixpkgs": [
+          "devenv",
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1760971495,
+        "narHash": "sha256-IwnNtbNVrlZIHh7h4Wz6VP0Furxg9Hh0ycighvL5cZc=",
+        "owner": "cachix",
+        "repo": "cachix",
+        "rev": "c5bfd933d1033672f51a863c47303fc0e093c2d2",
+        "type": "github"
+      },
+      "original": {
+        "owner": "cachix",
+        "ref": "latest",
+        "repo": "cachix",
+        "type": "github"
+      }
+    },
+    "devenv": {
+      "inputs": {
+        "cachix": "cachix",
+        "flake-compat": "flake-compat",
+        "flake-parts": "flake-parts",
+        "git-hooks": "git-hooks",
+        "nix": "nix",
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1766843567,
+        "narHash": "sha256-062oL6KZCH7ePf4BBG61OdFJUh5ovw6zTpd/lVwy/xk=",
+        "owner": "cachix",
+        "repo": "devenv",
+        "rev": "d0f2c8545f09e5aba9d321079a284b550371879d",
+        "type": "github"
+      },
+      "original": {
+        "owner": "cachix",
+        "repo": "devenv",
+        "type": "github"
+      }
+    },
+    "devenv-root": {
+      "flake": false,
+      "locked": {
+        "narHash": "sha256-d6xi4mKdjkX2JFicDIv5niSzpyI0m/Hnm8GGAIU04kY=",
+        "type": "file",
+        "url": "file:///dev/null"
+      },
+      "original": {
+        "type": "file",
+        "url": "file:///dev/null"
+      }
+    },
+    "fenix": {
+      "inputs": {
+        "nixpkgs": [
+          "alejandra",
+          "nixpkgs"
+        ],
+        "rust-analyzer-src": "rust-analyzer-src"
+      },
+      "locked": {
+        "lastModified": 1730615655,
+        "narHash": "sha256-2HBR3zLn57LXKNRtxBb+O+uDqHM4n0pz51rPayMl4cg=",
+        "owner": "nix-community",
+        "repo": "fenix",
+        "rev": "efeb50e2535b17ffd4a135e6e3e5fd60a525180c",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "repo": "fenix",
+        "type": "github"
+      }
+    },
+    "flake-compat": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1761588595,
+        "narHash": "sha256-XKUZz9zewJNUj46b4AJdiRZJAvSZ0Dqj2BNfXvFlJC4=",
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "rev": "f387cd2afec9419c8ee37694406ca490c3f34ee5",
+        "type": "github"
+      },
+      "original": {
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "type": "github"
+      }
+    },
+    "flake-parts": {
+      "inputs": {
+        "nixpkgs-lib": [
+          "devenv",
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1760948891,
+        "narHash": "sha256-TmWcdiUUaWk8J4lpjzu4gCGxWY6/Ok7mOK4fIFfBuU4=",
+        "owner": "hercules-ci",
+        "repo": "flake-parts",
+        "rev": "864599284fc7c0ba6357ed89ed5e2cd5040f0c04",
+        "type": "github"
+      },
+      "original": {
+        "owner": "hercules-ci",
+        "repo": "flake-parts",
+        "type": "github"
+      }
+    },
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1731533236,
+        "narHash": "sha256-l0KFg5HjrsfsO/JpG+r7fRrqm12kzFHyUHqHCVpMMbI=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "11707dc2f618dd54ca8739b309ec4fc024de578b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "flakeCompat": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1696426674,
+        "narHash": "sha256-kvjfFW7WAETZlt09AgDn1MrtKzP7t90Vf7vypd3OL1U=",
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "rev": "0f9255e01c2351cc7d116c072cb317785dd33b33",
+        "type": "github"
+      },
+      "original": {
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "type": "github"
+      }
+    },
+    "git-hooks": {
+      "inputs": {
+        "flake-compat": [
+          "devenv",
+          "flake-compat"
+        ],
+        "gitignore": "gitignore",
+        "nixpkgs": [
+          "devenv",
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1760663237,
+        "narHash": "sha256-BflA6U4AM1bzuRMR8QqzPXqh8sWVCNDzOdsxXEguJIc=",
+        "owner": "cachix",
+        "repo": "git-hooks.nix",
+        "rev": "ca5b894d3e3e151ffc1db040b6ce4dcc75d31c37",
+        "type": "github"
+      },
+      "original": {
+        "owner": "cachix",
+        "repo": "git-hooks.nix",
+        "type": "github"
+      }
+    },
+    "gitignore": {
+      "inputs": {
+        "nixpkgs": [
+          "devenv",
+          "git-hooks",
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1709087332,
+        "narHash": "sha256-HG2cCnktfHsKV0s4XW83gU3F57gaTljL9KNSuG6bnQs=",
+        "owner": "hercules-ci",
+        "repo": "gitignore.nix",
+        "rev": "637db329424fd7e46cf4185293b9cc8c88c95394",
+        "type": "github"
+      },
+      "original": {
+        "owner": "hercules-ci",
+        "repo": "gitignore.nix",
+        "type": "github"
+      }
+    },
+    "nix": {
+      "inputs": {
+        "flake-compat": [
+          "devenv",
+          "flake-compat"
+        ],
+        "flake-parts": [
+          "devenv",
+          "flake-parts"
+        ],
+        "git-hooks-nix": [
+          "devenv",
+          "git-hooks"
+        ],
+        "nixpkgs": [
+          "devenv",
+          "nixpkgs"
+        ],
+        "nixpkgs-23-11": [
+          "devenv"
+        ],
+        "nixpkgs-regression": [
+          "devenv"
+        ]
+      },
+      "locked": {
+        "lastModified": 1761648602,
+        "narHash": "sha256-H97KSB/luq/aGobKRuHahOvT1r7C03BgB6D5HBZsbN8=",
+        "owner": "cachix",
+        "repo": "nix",
+        "rev": "3e5644da6830ef65f0a2f7ec22830c46285bfff6",
+        "type": "github"
+      },
+      "original": {
+        "owner": "cachix",
+        "ref": "devenv-2.30.6",
+        "repo": "nix",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1764580874,
+        "narHash": "sha256-GMlWyeVh6fVuPeJI+ZmbJVV8DDS5wfdfDY88FHt5g/8=",
+        "owner": "cachix",
+        "repo": "devenv-nixpkgs",
+        "rev": "dcf61356c3ab25f1362b4a4428a6d871e84f1d1d",
+        "type": "github"
+      },
+      "original": {
+        "owner": "cachix",
+        "ref": "rolling",
+        "repo": "devenv-nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "alejandra": "alejandra",
+        "devenv": "devenv",
+        "devenv-root": "devenv-root",
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs",
+        "rust-overlay": "rust-overlay"
+      }
+    },
+    "rust-analyzer-src": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1730555913,
+        "narHash": "sha256-KNHZUlqsEibg3YtfUyOFQSofP8hp1HKoY+laoesBxRM=",
+        "owner": "rust-lang",
+        "repo": "rust-analyzer",
+        "rev": "f17a5bbfd0969ba2e63a74505a80e55ecb174ed9",
+        "type": "github"
+      },
+      "original": {
+        "owner": "rust-lang",
+        "ref": "nightly",
+        "repo": "rust-analyzer",
+        "type": "github"
+      }
+    },
+    "rust-overlay": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1766803264,
+        "narHash": "sha256-eGK6He8BR6L7N73kyyjz/vGxZX1Usnr8Gwfs3D18KgE=",
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "rev": "6b5c52313aaf3f3e1a0a6757bb89846edfb5195c",
+        "type": "github"
+      },
+      "original": {
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "type": "github"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/flake.nix b/flake.nix
new file mode 100644
index 0000000..1f48f99
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,57 @@
+{
+  inputs = {
+    nixpkgs.url = "github:cachix/devenv-nixpkgs/rolling";
+    flake-utils.url = "github:numtide/flake-utils";
+    alejandra = {
+      url = "github:kamadorueda/alejandra/4.0.0";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+    devenv = {
+      url = "github:cachix/devenv";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+    rust-overlay = {
+      url = "github:oxalica/rust-overlay";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+    devenv-root = {
+      url = "file+file:///dev/null";
+      flake = false;
+    };
+  };
+
+  nixConfig = {
+    extra-trusted-public-keys = [
+      "devenv.cachix.org-1:w1cLUi8dv3hnoSPGAuibQv+f9TZLr6cv/Hm9XgU50cw="
+    ];
+    extra-substituters = [
+      "https://devenv.cachix.org"
+    ];
+  };
+
+  outputs = {
+    self,
+    nixpkgs,
+    flake-utils,
+    rust-overlay,
+    alejandra,
+    ...
+  } @ inputs:
+    flake-utils.lib.eachDefaultSystem (
+      system: let
+        overlays = [(import rust-overlay)];
+        pkgs = import nixpkgs {inherit system overlays;};
+        rustVersion = pkgs.rust-bin.stable.latest.default;
+        rustPlatform = pkgs.makeRustPlatform {
+          cargo = rustVersion;
+          rustc = rustVersion;
+        };
+      in {
+        formatter = alejandra.defaultPackage.${system};
+        packages = import ./nix/package.nix {inherit pkgs rustPlatform;};
+        devShell = import ./nix/shell.nix {
+          inherit inputs pkgs self rustVersion system;
+        };
+      }
+    );
+}
diff --git a/justfile b/justfile
new file mode 100644
index 0000000..3bf3a14
--- /dev/null
+++ b/justfile
@@ -0,0 +1,48 @@
+default: run
+
+run:
+	cargo run
+
+run-release:
+	cargo run --release
+
+format:
+	cargo fmt --all
+
+format-check:
+	cargo fmt --check --all
+
+audit:
+	cargo deny check
+
+build:
+	cargo build
+
+build-release:
+	cargo build --release
+
+lint:
+	cargo clippy --all-targets
+
+release-build:
+	cargo build --release
+
+release-run:
+	cargo run --release
+
+test:
+	cargo test
+
+coverage:
+	mkdir -p coverage
+	cargo tarpaulin --config .tarpaulin.local.toml
+
+coverage-ci:
+	mkdir -p coverage
+	cargo tarpaulin --config .tarpaulin.ci.toml
+
+check-all: format-check lint coverage audit
+
+## Local Variables:
+## mode: makefile
+## End:
diff --git a/nix/package.nix b/nix/package.nix
new file mode 100644
index 0000000..fa7ab0d
--- /dev/null
+++ b/nix/package.nix
@@ -0,0 +1,21 @@
+{
+  pkgs,
+  rustPlatform,
+  ...
+}: let
+  cargoToml = builtins.fromTOML (builtins.readFile ../Cargo.toml);
+  name = cargoToml.package.name;
+  version = cargoToml.package.version;
+  rustBuild = rustPlatform.buildRustPackage {
+    pname = name;
+    inherit version;
+    src = ../.;
+    cargoLock.lockFile = ../Cargo.lock;
+  };
+  settingsDir = pkgs.runCommand "settings" {} ''
+    mkdir -p $out/settings
+    cp ${../settings}/*.yaml $out/settings/
+  '';
+in {
+  jj-mcp = rustBuild;
+}
diff --git a/nix/rust-version.nix b/nix/rust-version.nix
new file mode 100644
index 0000000..aa84d34
--- /dev/null
+++ b/nix/rust-version.nix
@@ -0,0 +1,11 @@
+{
+  rust-overlay,
+  inputs,
+  system,
+  ...
+}: let
+  overlays = [(import rust-overlay)];
+in rec {
+  pkgs = import inputs.nixpkgs {inherit system overlays;};
+  version = pkgs.rust-bin.stable.latest.default;
+}
diff --git a/nix/shell.nix b/nix/shell.nix
new file mode 100644
index 0000000..851d4c4
--- /dev/null
+++ b/nix/shell.nix
@@ -0,0 +1,49 @@
+{
+  inputs,
+  pkgs,
+  self,
+  rustVersion,
+  system,
+  ...
+}:
+inputs.devenv.lib.mkShell {
+  inherit inputs pkgs;
+  modules = [
+    {
+      packages = with pkgs; [
+        (rustVersion.override {
+          extensions = [
+            "clippy"
+            "rust-src"
+            "rust-analyzer"
+            "rustfmt"
+          ];
+        })
+        bacon
+        cargo-deny
+        cargo-edit
+        cargo-shuttle
+        cargo-tarpaulin
+        just
+        marksman # Markdown LSP server
+        tombi # TOML LSP server
+      ];
+
+      processes.run.exec = "bacon run";
+
+      enterShell = ''
+        echo "🦀 Rust MCP development environment loaded!"
+        echo "📦 Rust version: $(rustc --version)"
+        echo "📦 Cargo version: $(cargo --version)"
+        echo ""
+        echo "Available tools:"
+        echo "  - rust-analyzer (LSP)"
+        echo "  - clippy (linter)"
+        echo "  - rustfmt (formatter)"
+        echo "  - bacon (continuous testing/linting)"
+        echo "  - cargo-deny (dependency checker)"
+        echo "  - cargo-tarpaulin (code coverage)"
+      '';
+    }
+  ];
+}
diff --git a/settings/base.yaml b/settings/base.yaml
new file mode 100644
index 0000000..4b7f6fa
--- /dev/null
+++ b/settings/base.yaml
@@ -0,0 +1,8 @@
+application:
+  port: 3100
+  version: "0.1.0"
+
+rate_limit:
+  enabled: true
+  burst_size: 10
+  per_seconds: 60
diff --git a/settings/development.yaml b/settings/development.yaml
new file mode 100644
index 0000000..f89252b
--- /dev/null
+++ b/settings/development.yaml
@@ -0,0 +1,8 @@
+frontend_url: http://localhost:3000
+debug: true
+
+application:
+  protocol: http
+  host: 127.0.0.1
+  base_url: http://127.0.0.1:3100
+  name: "sta-dev"
diff --git a/settings/production.yaml b/settings/production.yaml
new file mode 100644
index 0000000..1c45abf
--- /dev/null
+++ b/settings/production.yaml
@@ -0,0 +1,8 @@
+debug: false
+frontend_url: ""
+
+application:
+  name: "sta-prod"
+  protocol: https
+  host: 0.0.0.0
+  base_url: ""
diff --git a/sonar-project.properties b/sonar-project.properties
new file mode 100644
index 0000000..9d29184
--- /dev/null
+++ b/sonar-project.properties
@@ -0,0 +1 @@
+sonar.projectKey=sta
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..c3472e2
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,81 @@
+//! Backend API server for STA
+//!
+//! This is a REST API built with the Poem framework that provides:
+//! - Health check endpoints
+//! - Application metadata endpoints
+
+#![deny(clippy::all)]
+#![deny(clippy::pedantic)]
+#![deny(clippy::nursery)]
+#![warn(missing_docs)]
+#![allow(clippy::unused_async)]
+
+/// Custom middleware implementations
+pub mod middleware;
+/// API route handlers and endpoints
+pub mod route;
+/// Application configuration settings
+pub mod settings;
+/// Application startup and server configuration
+pub mod startup;
+/// Logging and tracing setup
+pub mod telemetry;
+
+type MaybeListener = Option<poem::listener::TcpListener<String>>;
+
+fn prepare(listener: MaybeListener) -> startup::Application {
+    dotenvy::dotenv().ok();
+    let settings = settings::Settings::new().expect("Failed to read settings");
+    if !cfg!(test) {
+        let subscriber = telemetry::get_subscriber(settings.debug);
+        telemetry::init_subscriber(subscriber);
+    }
+    tracing::event!(
+        target: "backend",
+        tracing::Level::DEBUG,
+        "Using these settings: {:?}",
+        settings
+    );
+    let application = startup::Application::build(settings, listener);
+    tracing::event!(
+        target: "backend",
+        tracing::Level::INFO,
+        "Listening on http://{}:{}/",
+        application.host(),
+        application.port()
+    );
+    tracing::event!(
+        target: "backend",
+        tracing::Level::INFO,
+        "Documentation available at http://{}:{}/",
+        application.host(),
+        application.port()
+    );
+    application
+}
+
+/// Runs the application with the specified TCP listener.
+///
+/// # Errors
+///
+/// Returns a `std::io::Error` if the server fails to start or encounters
+/// an I/O error during runtime (e.g., port already in use, network issues).
+#[cfg(not(tarpaulin_include))]
+pub async fn run(listener: MaybeListener) -> Result<(), std::io::Error> {
+    let application = prepare(listener);
+    application.make_app().run().await
+}
+
+#[cfg(test)]
+fn make_random_tcp_listener() -> poem::listener::TcpListener<String> {
+    let tcp_listener =
+        std::net::TcpListener::bind("127.0.0.1:0").expect("Failed to bind a random TCP listener");
+    let port = tcp_listener.local_addr().unwrap().port();
+    poem::listener::TcpListener::bind(format!("127.0.0.1:{port}"))
+}
+
+#[cfg(test)]
+fn get_test_app() -> startup::App {
+    let tcp_listener = make_random_tcp_listener();
+    prepare(Some(tcp_listener)).make_app().into()
+}
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..55bddfe
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,7 @@
+//! Backend server entry point.
+
+#[cfg(not(tarpaulin_include))]
+#[tokio::main]
+async fn main() -> Result<(), std::io::Error> {
+    sta::run(None).await
+}
diff --git a/src/middleware/mod.rs b/src/middleware/mod.rs
new file mode 100644
index 0000000..16c713b
--- /dev/null
+++ b/src/middleware/mod.rs
@@ -0,0 +1,5 @@
+//! Custom middleware for the application.
+//!
+//! This module contains custom middleware implementations including rate limiting.
+
+pub mod rate_limit;
diff --git a/src/middleware/rate_limit.rs b/src/middleware/rate_limit.rs
new file mode 100644
index 0000000..f907b28
--- /dev/null
+++ b/src/middleware/rate_limit.rs
@@ -0,0 +1,208 @@
+//! Rate limiting middleware using the governor crate.
+//!
+//! This middleware implements per-IP rate limiting using the Generic Cell Rate
+//! Algorithm (GCRA) via the governor crate. It stores rate limiters in memory
+//! without requiring external dependencies like Redis.
+
+use std::{net::IpAddr, num::NonZeroU32, sync::Arc, time::Duration};
+
+use governor::{
+    Quota, RateLimiter,
+    clock::DefaultClock,
+    state::{InMemoryState, NotKeyed},
+};
+use poem::{Endpoint, Error, IntoResponse, Middleware, Request, Response, Result};
+
+/// Rate limiting configuration.
+#[derive(Debug, Clone)]
+pub struct RateLimitConfig {
+    /// Maximum number of requests allowed in the time window (burst size).
+    pub burst_size: u32,
+    /// Time window in seconds for rate limiting.
+    pub per_seconds: u64,
+}
+
+impl RateLimitConfig {
+    /// Creates a new rate limit configuration.
+    ///
+    /// # Arguments
+    ///
+    /// * `burst_size` - Maximum number of requests allowed in the time window
+    /// * `per_seconds` - Time window in seconds
+    #[must_use]
+    pub const fn new(burst_size: u32, per_seconds: u64) -> Self {
+        Self {
+            burst_size,
+            per_seconds,
+        }
+    }
+
+    /// Creates a rate limiter from this configuration.
+    ///
+    /// # Panics
+    ///
+    /// Panics if `burst_size` is zero.
+    #[must_use]
+    pub fn create_limiter(&self) -> RateLimiter<NotKeyed, InMemoryState, DefaultClock> {
+        let quota = Quota::with_period(Duration::from_secs(self.per_seconds))
+            .expect("Failed to create quota")
+            .allow_burst(NonZeroU32::new(self.burst_size).expect("Burst size must be non-zero"));
+        RateLimiter::direct(quota)
+    }
+}
+
+impl Default for RateLimitConfig {
+    fn default() -> Self {
+        // Default: 10 requests per second with burst of 20
+        Self::new(20, 1)
+    }
+}
+
+/// Middleware for rate limiting based on IP address.
+pub struct RateLimit {
+    limiter: Arc<RateLimiter<NotKeyed, InMemoryState, DefaultClock>>,
+}
+
+impl RateLimit {
+    /// Creates a new rate limiting middleware with the given configuration.
+    #[must_use]
+    pub fn new(config: &RateLimitConfig) -> Self {
+        Self {
+            limiter: Arc::new(config.create_limiter()),
+        }
+    }
+}
+
+impl<E: Endpoint> Middleware<E> for RateLimit {
+    type Output = RateLimitEndpoint<E>;
+
+    fn transform(&self, ep: E) -> Self::Output {
+        RateLimitEndpoint {
+            endpoint: ep,
+            limiter: self.limiter.clone(),
+        }
+    }
+}
+
+/// The endpoint wrapper that performs rate limiting checks.
+pub struct RateLimitEndpoint<E> {
+    endpoint: E,
+    limiter: Arc<RateLimiter<NotKeyed, InMemoryState, DefaultClock>>,
+}
+
+impl<E: Endpoint> Endpoint for RateLimitEndpoint<E> {
+    type Output = Response;
+
+    async fn call(&self, req: Request) -> Result<Self::Output> {
+        // Check rate limit
+        if self.limiter.check().is_err() {
+            let client_ip = Self::get_client_ip(&req)
+                .map_or_else(|| "unknown".to_string(), |ip| ip.to_string());
+
+            tracing::event!(
+                target: "backend::middleware::rate_limit",
+                tracing::Level::WARN,
+                client_ip = %client_ip,
+                "Rate limit exceeded"
+            );
+
+            return Err(Error::from_status(
+                poem::http::StatusCode::TOO_MANY_REQUESTS,
+            ));
+        }
+
+        // Process the request
+        let response = self.endpoint.call(req).await;
+        response.map(IntoResponse::into_response)
+    }
+}
+
+impl<E> RateLimitEndpoint<E> {
+    /// Extracts the client IP address from the request.
+    fn get_client_ip(req: &Request) -> Option<IpAddr> {
+        req.remote_addr()
+            .as_socket_addr()
+            .map(std::net::SocketAddr::ip)
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn rate_limit_config_new() {
+        let config = RateLimitConfig::new(10, 60);
+        assert_eq!(config.burst_size, 10);
+        assert_eq!(config.per_seconds, 60);
+    }
+
+    #[test]
+    fn rate_limit_config_default() {
+        let config = RateLimitConfig::default();
+        assert_eq!(config.burst_size, 20);
+        assert_eq!(config.per_seconds, 1);
+    }
+
+    #[test]
+    fn rate_limit_config_creates_limiter() {
+        let config = RateLimitConfig::new(5, 1);
+        let limiter = config.create_limiter();
+
+        // First 5 requests should succeed
+        for _ in 0..5 {
+            assert!(limiter.check().is_ok());
+        }
+
+        // 6th request should fail
+        assert!(limiter.check().is_err());
+    }
+
+    #[tokio::test]
+    async fn rate_limit_middleware_allows_within_limit() {
+        use poem::{EndpointExt, Route, handler, test::TestClient};
+
+        #[handler]
+        async fn index() -> String {
+            "Hello".to_string()
+        }
+
+        let config = RateLimitConfig::new(5, 60);
+        let app = Route::new()
+            .at("/", poem::get(index))
+            .with(RateLimit::new(&config));
+        let cli = TestClient::new(app);
+
+        // First 5 requests should succeed
+        for _ in 0..5 {
+            let response = cli.get("/").send().await;
+            response.assert_status_is_ok();
+        }
+    }
+
+    #[tokio::test]
+    async fn rate_limit_middleware_blocks_over_limit() {
+        use poem::{EndpointExt, Route, handler, test::TestClient};
+
+        #[handler]
+        async fn index() -> String {
+            "Hello".to_string()
+        }
+
+        let config = RateLimitConfig::new(3, 60);
+        let app = Route::new()
+            .at("/", poem::get(index))
+            .with(RateLimit::new(&config));
+        let cli = TestClient::new(app);
+
+        // First 3 requests should succeed
+        for _ in 0..3 {
+            let response = cli.get("/").send().await;
+            response.assert_status_is_ok();
+        }
+
+        // 4th request should be rate limited
+        let response = cli.get("/").send().await;
+        response.assert_status(poem::http::StatusCode::TOO_MANY_REQUESTS);
+    }
+}
diff --git a/src/route/health.rs b/src/route/health.rs
new file mode 100644
index 0000000..0d6a4bb
--- /dev/null
+++ b/src/route/health.rs
@@ -0,0 +1,38 @@
+//! Health check endpoint for monitoring service availability.
+
+use poem_openapi::{ApiResponse, OpenApi};
+
+use super::ApiCategory;
+
+#[derive(ApiResponse)]
+enum HealthResponse {
+    /// Success
+    #[oai(status = 200)]
+    Ok,
+    /// Too Many Requests - rate limit exceeded
+    #[oai(status = 429)]
+    #[allow(dead_code)]
+    TooManyRequests,
+}
+
+/// Health check API for monitoring service availability.
+#[derive(Default, Clone)]
+pub struct HealthApi;
+
+#[OpenApi(tag = "ApiCategory::Health")]
+impl HealthApi {
+    #[oai(path = "/health", method = "get")]
+    async fn ping(&self) -> HealthResponse {
+        tracing::event!(target: "backend::health", tracing::Level::DEBUG, "Accessing health-check endpoint");
+        HealthResponse::Ok
+    }
+}
+
+#[tokio::test]
+async fn health_check_works() {
+    let app = crate::get_test_app();
+    let cli = poem::test::TestClient::new(app);
+    let resp = cli.get("/api/health").send().await;
+    resp.assert_status_is_ok();
+    resp.assert_text("").await;
+}
diff --git a/src/route/meta.rs b/src/route/meta.rs
new file mode 100644
index 0000000..c2083de
--- /dev/null
+++ b/src/route/meta.rs
@@ -0,0 +1,86 @@
+//! Application metadata endpoint for retrieving version and name information.
+
+use poem::Result;
+use poem_openapi::{ApiResponse, Object, OpenApi, payload::Json};
+
+use super::ApiCategory;
+use crate::settings::ApplicationSettings;
+
+#[derive(Object, Debug, Clone, serde::Serialize, serde::Deserialize)]
+struct Meta {
+    version: String,
+    name: String,
+}
+
+impl From<&MetaApi> for Meta {
+    fn from(value: &MetaApi) -> Self {
+        let version = value.version.clone();
+        let name = value.name.clone();
+        Self { version, name }
+    }
+}
+
+#[derive(ApiResponse)]
+enum MetaResponse {
+    /// Success
+    #[oai(status = 200)]
+    Meta(Json<Meta>),
+    /// Too Many Requests - rate limit exceeded
+    #[oai(status = 429)]
+    #[allow(dead_code)]
+    TooManyRequests,
+}
+
+/// API for retrieving application metadata (name and version).
+#[derive(Clone)]
+pub struct MetaApi {
+    name: String,
+    version: String,
+}
+
+impl From<&ApplicationSettings> for MetaApi {
+    fn from(value: &ApplicationSettings) -> Self {
+        let name = value.name.clone();
+        let version = value.version.clone();
+        Self { name, version }
+    }
+}
+
+#[OpenApi(tag = "ApiCategory::Meta")]
+impl MetaApi {
+    #[oai(path = "/meta", method = "get")]
+    async fn meta(&self) -> Result<MetaResponse> {
+        tracing::event!(target: "backend::meta", tracing::Level::DEBUG, "Accessing meta endpoint");
+        Ok(MetaResponse::Meta(Json(self.into())))
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    #[tokio::test]
+    async fn meta_endpoint_returns_correct_data() {
+        let app = crate::get_test_app();
+        let cli = poem::test::TestClient::new(app);
+        let resp = cli.get("/api/meta").send().await;
+        resp.assert_status_is_ok();
+
+        let json_value: serde_json::Value = resp.json().await.value().deserialize();
+
+        assert!(
+            json_value.get("version").is_some(),
+            "Response should have version field"
+        );
+        assert!(
+            json_value.get("name").is_some(),
+            "Response should have name field"
+        );
+    }
+
+    #[tokio::test]
+    async fn meta_endpoint_returns_200_status() {
+        let app = crate::get_test_app();
+        let cli = poem::test::TestClient::new(app);
+        let resp = cli.get("/api/meta").send().await;
+        resp.assert_status_is_ok();
+    }
+}
diff --git a/src/route/mod.rs b/src/route/mod.rs
new file mode 100644
index 0000000..e7b37c4
--- /dev/null
+++ b/src/route/mod.rs
@@ -0,0 +1,37 @@
+//! API route handlers for the backend server.
+//!
+//! This module contains all the HTTP endpoint handlers organized by functionality:
+//! - Health checks
+//! - Application metadata
+
+use poem_openapi::Tags;
+
+mod health;
+mod meta;
+
+use crate::settings::Settings;
+
+#[derive(Tags)]
+enum ApiCategory {
+    Health,
+    Meta,
+}
+
+pub(crate) struct Api {
+    health: health::HealthApi,
+    meta: meta::MetaApi,
+}
+
+impl From<&Settings> for Api {
+    fn from(value: &Settings) -> Self {
+        let health = health::HealthApi;
+        let meta = meta::MetaApi::from(&value.application);
+        Self { health, meta }
+    }
+}
+
+impl Api {
+    pub fn apis(self) -> (health::HealthApi, meta::MetaApi) {
+        (self.health, self.meta)
+    }
+}
diff --git a/src/settings.rs b/src/settings.rs
new file mode 100644
index 0000000..f90f6ce
--- /dev/null
+++ b/src/settings.rs
@@ -0,0 +1,284 @@
+//! Application configuration settings.
+//!
+//! This module provides configuration structures that can be loaded from:
+//! - YAML configuration files (base.yaml and environment-specific files)
+//! - Environment variables (prefixed with APP__)
+//!
+//! Settings include application details, email server configuration, and environment settings.
+
+/// Application configuration settings.
+///
+/// Loads configuration from YAML files and environment variables.
+#[derive(Debug, serde::Deserialize, Clone, Default)]
+pub struct Settings {
+    /// Application-specific settings (name, version, host, port, etc.)
+    pub application: ApplicationSettings,
+    /// Debug mode flag
+    pub debug: bool,
+    /// Frontend URL for CORS configuration
+    pub frontend_url: String,
+    /// Rate limiting configuration
+    #[serde(default)]
+    pub rate_limit: RateLimitSettings,
+}
+
+impl Settings {
+    /// Creates a new `Settings` instance by loading configuration from files and environment variables.
+    ///
+    /// # Errors
+    ///
+    /// Returns a `config::ConfigError` if:
+    /// - Configuration files cannot be read or parsed
+    /// - Required configuration values are missing
+    /// - Configuration values cannot be deserialized into the expected types
+    ///
+    /// # Panics
+    ///
+    /// Panics if:
+    /// - The current directory cannot be determined
+    /// - The `APP_ENVIRONMENT` variable contains an invalid value (not "dev", "development", "prod", or "production")
+    pub fn new() -> Result<Self, config::ConfigError> {
+        let base_path = std::env::current_dir().expect("Failed to determine the current directory");
+        let settings_directory = base_path.join("settings");
+        let environment: Environment = std::env::var("APP_ENVIRONMENT")
+            .unwrap_or_else(|_| "dev".into())
+            .try_into()
+            .expect("Failed to parse APP_ENVIRONMENT");
+        let environment_filename = format!("{environment}.yaml");
+        // Lower = takes precedence
+        let settings = config::Config::builder()
+            .add_source(config::File::from(settings_directory.join("base.yaml")))
+            .add_source(config::File::from(
+                settings_directory.join(environment_filename),
+            ))
+            .add_source(
+                config::Environment::with_prefix("APP")
+                    .prefix_separator("__")
+                    .separator("__"),
+            )
+            .build()?;
+        settings.try_deserialize()
+    }
+}
+
+/// Application-specific configuration settings.
+#[derive(Debug, serde::Deserialize, Clone, Default)]
+pub struct ApplicationSettings {
+    /// Application name
+    pub name: String,
+    /// Application version
+    pub version: String,
+    /// Port to bind to
+    pub port: u16,
+    /// Host address to bind to
+    pub host: String,
+    /// Base URL of the application
+    pub base_url: String,
+    /// Protocol (http or https)
+    pub protocol: String,
+}
+
+/// Application environment.
+#[derive(Debug, PartialEq, Eq, Default)]
+pub enum Environment {
+    /// Development environment
+    #[default]
+    Development,
+    /// Production environment
+    Production,
+}
+
+impl std::fmt::Display for Environment {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        let self_str = match self {
+            Self::Development => "development",
+            Self::Production => "production",
+        };
+        write!(f, "{self_str}")
+    }
+}
+
+impl TryFrom<String> for Environment {
+    type Error = String;
+
+    fn try_from(value: String) -> Result<Self, Self::Error> {
+        Self::try_from(value.as_str())
+    }
+}
+
+impl TryFrom<&str> for Environment {
+    type Error = String;
+
+    fn try_from(value: &str) -> Result<Self, Self::Error> {
+        match value.to_lowercase().as_str() {
+            "development" | "dev" => Ok(Self::Development),
+            "production" | "prod" => Ok(Self::Production),
+            other => Err(format!(
+                "{other} is not a supported environment. Use either `development` or `production`"
+            )),
+        }
+    }
+}
+
+/// Rate limiting configuration.
+#[derive(Debug, serde::Deserialize, Clone)]
+pub struct RateLimitSettings {
+    /// Whether rate limiting is enabled
+    #[serde(default = "default_rate_limit_enabled")]
+    pub enabled: bool,
+    /// Maximum number of requests allowed in the time window (burst size)
+    #[serde(default = "default_burst_size")]
+    pub burst_size: u32,
+    /// Time window in seconds for rate limiting
+    #[serde(default = "default_per_seconds")]
+    pub per_seconds: u64,
+}
+
+impl Default for RateLimitSettings {
+    fn default() -> Self {
+        Self {
+            enabled: default_rate_limit_enabled(),
+            burst_size: default_burst_size(),
+            per_seconds: default_per_seconds(),
+        }
+    }
+}
+
+const fn default_rate_limit_enabled() -> bool {
+    true
+}
+
+const fn default_burst_size() -> u32 {
+    100
+}
+
+const fn default_per_seconds() -> u64 {
+    60
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn environment_display_development() {
+        let env = Environment::Development;
+        assert_eq!(env.to_string(), "development");
+    }
+
+    #[test]
+    fn environment_display_production() {
+        let env = Environment::Production;
+        assert_eq!(env.to_string(), "production");
+    }
+
+    #[test]
+    fn environment_from_str_development() {
+        assert_eq!(
+            Environment::try_from("development").unwrap(),
+            Environment::Development
+        );
+        assert_eq!(
+            Environment::try_from("dev").unwrap(),
+            Environment::Development
+        );
+        assert_eq!(
+            Environment::try_from("Development").unwrap(),
+            Environment::Development
+        );
+        assert_eq!(
+            Environment::try_from("DEV").unwrap(),
+            Environment::Development
+        );
+    }
+
+    #[test]
+    fn environment_from_str_production() {
+        assert_eq!(
+            Environment::try_from("production").unwrap(),
+            Environment::Production
+        );
+        assert_eq!(
+            Environment::try_from("prod").unwrap(),
+            Environment::Production
+        );
+        assert_eq!(
+            Environment::try_from("Production").unwrap(),
+            Environment::Production
+        );
+        assert_eq!(
+            Environment::try_from("PROD").unwrap(),
+            Environment::Production
+        );
+    }
+
+    #[test]
+    fn environment_from_str_invalid() {
+        let result = Environment::try_from("invalid");
+        assert!(result.is_err());
+        assert!(result.unwrap_err().contains("not a supported environment"));
+    }
+
+    #[test]
+    fn environment_from_string_development() {
+        assert_eq!(
+            Environment::try_from("development".to_string()).unwrap(),
+            Environment::Development
+        );
+    }
+
+    #[test]
+    fn environment_from_string_production() {
+        assert_eq!(
+            Environment::try_from("production".to_string()).unwrap(),
+            Environment::Production
+        );
+    }
+
+    #[test]
+    fn environment_from_string_invalid() {
+        let result = Environment::try_from("invalid".to_string());
+        assert!(result.is_err());
+    }
+
+    #[test]
+    fn environment_default_is_development() {
+        let env = Environment::default();
+        assert_eq!(env, Environment::Development);
+    }
+
+    #[test]
+    fn rate_limit_settings_default() {
+        let settings = RateLimitSettings::default();
+        assert!(settings.enabled);
+        assert_eq!(settings.burst_size, 100);
+        assert_eq!(settings.per_seconds, 60);
+    }
+
+    #[test]
+    fn rate_limit_settings_deserialize_full() {
+        let json = r#"{"enabled": true, "burst_size": 50, "per_seconds": 30}"#;
+        let settings: RateLimitSettings = serde_json::from_str(json).unwrap();
+        assert!(settings.enabled);
+        assert_eq!(settings.burst_size, 50);
+        assert_eq!(settings.per_seconds, 30);
+    }
+
+    #[test]
+    fn rate_limit_settings_deserialize_partial() {
+        let json = r#"{"enabled": false}"#;
+        let settings: RateLimitSettings = serde_json::from_str(json).unwrap();
+        assert!(!settings.enabled);
+        assert_eq!(settings.burst_size, 100); // default
+        assert_eq!(settings.per_seconds, 60); // default
+    }
+
+    #[test]
+    fn rate_limit_settings_deserialize_empty() {
+        let json = "{}";
+        let settings: RateLimitSettings = serde_json::from_str(json).unwrap();
+        assert!(settings.enabled); // default
+        assert_eq!(settings.burst_size, 100); // default
+        assert_eq!(settings.per_seconds, 60); // default
+    }
+}
diff --git a/src/startup.rs b/src/startup.rs
new file mode 100644
index 0000000..af3598e
--- /dev/null
+++ b/src/startup.rs
@@ -0,0 +1,227 @@
+//! Application startup and server configuration.
+//!
+//! This module handles:
+//! - Building the application with routes and middleware
+//! - Setting up the OpenAPI service and Swagger UI
+//! - Configuring CORS
+//! - Starting the HTTP server
+
+use poem::middleware::{AddDataEndpoint, Cors, CorsEndpoint};
+use poem::{EndpointExt, Route};
+use poem_openapi::OpenApiService;
+
+use crate::{
+    middleware::rate_limit::{RateLimit, RateLimitConfig},
+    route::Api,
+    settings::Settings,
+};
+
+use crate::middleware::rate_limit::RateLimitEndpoint;
+
+type Server = poem::Server<poem::listener::TcpListener<String>, std::convert::Infallible>;
+/// The configured application with rate limiting, CORS, and settings data.
+pub type App = AddDataEndpoint<CorsEndpoint<RateLimitEndpoint<Route>>, Settings>;
+
+/// Application builder that holds the server configuration before running.
+pub struct Application {
+    server: Server,
+    app: poem::Route,
+    host: String,
+    port: u16,
+    settings: Settings,
+}
+
+/// A fully configured application ready to run.
+pub struct RunnableApplication {
+    server: Server,
+    app: App,
+}
+
+impl RunnableApplication {
+    /// Runs the application server.
+    ///
+    /// # Errors
+    ///
+    /// Returns a `std::io::Error` if the server fails to start or encounters
+    /// an I/O error during runtime (e.g., port already in use, network issues).
+    pub async fn run(self) -> Result<(), std::io::Error> {
+        self.server.run(self.app).await
+    }
+}
+
+impl From<RunnableApplication> for App {
+    fn from(value: RunnableApplication) -> Self {
+        value.app
+    }
+}
+
+impl From<Application> for RunnableApplication {
+    fn from(value: Application) -> Self {
+        // Configure rate limiting based on settings
+        let rate_limit_config = if value.settings.rate_limit.enabled {
+            tracing::event!(
+                target: "backend::startup",
+                tracing::Level::INFO,
+                burst_size = value.settings.rate_limit.burst_size,
+                per_seconds = value.settings.rate_limit.per_seconds,
+                "Rate limiting enabled"
+            );
+            RateLimitConfig::new(
+                value.settings.rate_limit.burst_size,
+                value.settings.rate_limit.per_seconds,
+            )
+        } else {
+            tracing::event!(
+                target: "backend::startup",
+                tracing::Level::INFO,
+                "Rate limiting disabled (using very high limits)"
+            );
+            // Use very high limits to effectively disable rate limiting
+            RateLimitConfig::new(u32::MAX, 1)
+        };
+
+        let app = value
+            .app
+            .with(RateLimit::new(&rate_limit_config))
+            .with(Cors::new())
+            .data(value.settings);
+
+        let server = value.server;
+        Self { server, app }
+    }
+}
+
+impl Application {
+    fn setup_app(settings: &Settings) -> poem::Route {
+        let api_service = OpenApiService::new(
+            Api::from(settings).apis(),
+            settings.application.clone().name,
+            settings.application.clone().version,
+        )
+        .url_prefix("/api");
+        let ui = api_service.swagger_ui();
+        poem::Route::new()
+            .nest("/api", api_service.clone())
+            .nest("/specs", api_service.spec_endpoint_yaml())
+            .nest("/", ui)
+    }
+
+    fn setup_server(
+        settings: &Settings,
+        tcp_listener: Option<poem::listener::TcpListener<String>>,
+    ) -> Server {
+        let tcp_listener = tcp_listener.unwrap_or_else(|| {
+            let address = format!(
+                "{}:{}",
+                settings.application.host, settings.application.port
+            );
+            poem::listener::TcpListener::bind(address)
+        });
+        poem::Server::new(tcp_listener)
+    }
+
+    /// Builds a new application with the given settings and optional TCP listener.
+    ///
+    /// If no listener is provided, one will be created based on the settings.
+    #[must_use]
+    pub fn build(
+        settings: Settings,
+        tcp_listener: Option<poem::listener::TcpListener<String>>,
+    ) -> Self {
+        let port = settings.application.port;
+        let host = settings.application.clone().host;
+        let app = Self::setup_app(&settings);
+        let server = Self::setup_server(&settings, tcp_listener);
+        Self {
+            server,
+            app,
+            host,
+            port,
+            settings,
+        }
+    }
+
+    /// Converts the application into a runnable application.
+    #[must_use]
+    pub fn make_app(self) -> RunnableApplication {
+        self.into()
+    }
+
+    /// Returns the host address the application is configured to bind to.
+    #[must_use]
+    pub fn host(&self) -> String {
+        self.host.clone()
+    }
+
+    /// Returns the port the application is configured to bind to.
+    #[must_use]
+    pub const fn port(&self) -> u16 {
+        self.port
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    fn create_test_settings() -> Settings {
+        Settings {
+            application: crate::settings::ApplicationSettings {
+                name: "test-app".to_string(),
+                version: "1.0.0".to_string(),
+                port: 8080,
+                host: "127.0.0.1".to_string(),
+                base_url: "http://localhost:8080".to_string(),
+                protocol: "http".to_string(),
+            },
+            debug: false,
+            frontend_url: "http://localhost:3000".to_string(),
+            rate_limit: crate::settings::RateLimitSettings {
+                enabled: false,
+                burst_size: 100,
+                per_seconds: 60,
+            },
+        }
+    }
+
+    #[test]
+    fn application_build_and_host() {
+        let settings = create_test_settings();
+        let app = Application::build(settings.clone(), None);
+        assert_eq!(app.host(), settings.application.host);
+    }
+
+    #[test]
+    fn application_build_and_port() {
+        let settings = create_test_settings();
+        let app = Application::build(settings, None);
+        assert_eq!(app.port(), 8080);
+    }
+
+    #[test]
+    fn application_host_returns_correct_value() {
+        let settings = create_test_settings();
+        let app = Application::build(settings, None);
+        assert_eq!(app.host(), "127.0.0.1");
+    }
+
+    #[test]
+    fn application_port_returns_correct_value() {
+        let settings = create_test_settings();
+        let app = Application::build(settings, None);
+        assert_eq!(app.port(), 8080);
+    }
+
+    #[test]
+    fn application_with_custom_listener() {
+        let settings = create_test_settings();
+        let tcp_listener =
+            std::net::TcpListener::bind("127.0.0.1:0").expect("Failed to bind random port");
+        let port = tcp_listener.local_addr().unwrap().port();
+        let listener = poem::listener::TcpListener::bind(format!("127.0.0.1:{port}"));
+
+        let app = Application::build(settings, Some(listener));
+        assert_eq!(app.host(), "127.0.0.1");
+        assert_eq!(app.port(), 8080);
+    }
+}
diff --git a/src/telemetry.rs b/src/telemetry.rs
new file mode 100644
index 0000000..70c3c21
--- /dev/null
+++ b/src/telemetry.rs
@@ -0,0 +1,69 @@
+//! Logging and tracing configuration.
+//!
+//! This module provides utilities for setting up structured logging using the tracing crate.
+//! Supports both pretty-printed logs for development and JSON logs for production.
+
+use tracing_subscriber::layer::SubscriberExt;
+
+/// Creates a tracing subscriber configured for the given debug mode.
+///
+/// In debug mode, logs are pretty-printed to stdout.
+/// In production mode, logs are output as JSON.
+#[must_use]
+pub fn get_subscriber(debug: bool) -> impl tracing::Subscriber + Send + Sync {
+    let env_filter = if debug { "debug" } else { "info" }.to_string();
+    let env_filter = tracing_subscriber::EnvFilter::try_from_default_env()
+        .unwrap_or_else(|_| tracing_subscriber::EnvFilter::new(env_filter));
+    let stdout_log = tracing_subscriber::fmt::layer().pretty();
+    let subscriber = tracing_subscriber::Registry::default()
+        .with(env_filter)
+        .with(stdout_log);
+    let json_log = if debug {
+        None
+    } else {
+        Some(tracing_subscriber::fmt::layer().json())
+    };
+    subscriber.with(json_log)
+}
+
+/// Initializes the global tracing subscriber.
+///
+/// # Panics
+///
+/// Panics if:
+/// - A global subscriber has already been set
+/// - The subscriber cannot be set as the global default
+pub fn init_subscriber(subscriber: impl tracing::Subscriber + Send + Sync) {
+    tracing::subscriber::set_global_default(subscriber).expect("Failed to set subscriber");
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn get_subscriber_debug_mode() {
+        let subscriber = get_subscriber(true);
+        // If we can create the subscriber without panicking, the test passes
+        // We can't easily inspect the subscriber's internals, but we can verify it's created
+        let _ = subscriber;
+    }
+
+    #[test]
+    fn get_subscriber_production_mode() {
+        let subscriber = get_subscriber(false);
+        // If we can create the subscriber without panicking, the test passes
+        let _ = subscriber;
+    }
+
+    #[test]
+    fn get_subscriber_creates_valid_subscriber() {
+        // Test both debug and non-debug modes create valid subscribers
+        let debug_subscriber = get_subscriber(true);
+        let prod_subscriber = get_subscriber(false);
+
+        // Basic smoke test - if these are created without panicking, they're valid
+        let _ = debug_subscriber;
+        let _ = prod_subscriber;
+    }
+}