commit d5a2859b648471ae9ef60cd08ff185890c8a18a7
Author: Lucien Cartier-Tilet <lucien@phundrak.com>
Date:   Sun Dec 21 18:19:21 2025 +0100

    feat: rust project initialization

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 @@
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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;
+    }
+}