diff --git a/.devcontainer/devcontainer.json b/.devcontainer/devcontainer.json
new file mode 100644
index 0000000..1981045
--- /dev/null
+++ b/.devcontainer/devcontainer.json
@@ -0,0 +1,42 @@
+{
+  "name": "Finance App Development",
+  "image": "mcr.microsoft.com/devcontainers/typescript-node:1-20-bullseye",
+  "features": {
+    "ghcr.io/devcontainers/features/git:1": {}
+  },
+  "customizations": {
+    "vscode": {
+      "extensions": [
+        "astro-build.astro-vscode",
+        "biomejs.biome-vscode",
+        "GitHub.copilot",
+        "GitHub.copilot-chat",
+        "ms-vscode.vscode-typescript-next",
+        "bradlc.vscode-tailwindcss"
+      ],
+      "settings": {
+        "editor.formatOnSave": true,
+        "editor.defaultFormatter": "biomejs.biome-vscode",
+        "[astro]": {
+          "editor.defaultFormatter": "astro-build.astro-vscode"
+        },
+        "editor.codeActionsOnSave": {
+          "source.organizeImports.biome": true,
+          "quickfix.biome": true
+        },
+        "typescript.updateImportsOnFileMove.enabled": "always",
+        "editor.bracketPairColorization.enabled": true,
+        "files.exclude": {
+          "**/.git": true,
+          "**/.DS_Store": true,
+          "**/node_modules": true,
+          "**/.idea": true
+        },
+        "terminal.integrated.defaultProfile.linux": "bash"
+      }
+    }
+  },
+  "forwardPorts": [3000],
+  "postCreateCommand": "npm install",
+  "remoteUser": "node"
+}
diff --git a/astro.config.mjs b/astro.config.mjs
index c5a9652..388e3c2 100644
--- a/astro.config.mjs
+++ b/astro.config.mjs
@@ -1,20 +1,20 @@
 // @ts-check
-import { defineConfig } from "astro/config";
+import { defineConfig } from 'astro/config';
 
-import cloudflare from "@astrojs/cloudflare";
+import cloudflare from '@astrojs/cloudflare';
 
-import react from "@astrojs/react";
+import react from '@astrojs/react';
 
 // https://astro.build/config
 export default defineConfig({
-  output: "server",
+  output: 'server',
   adapter: cloudflare(),
   integrations: [react()],
   vite: {
     resolve: {
       alias: {
-        "react-dom/server": "react-dom/server",
-        "react-dom/server.browser": "react-dom/server",
+        'react-dom/server': 'react-dom/server',
+        'react-dom/server.browser': 'react-dom/server',
       },
     },
   },
diff --git a/biome.json b/biome.json
new file mode 100644
index 0000000..dff6a0e
--- /dev/null
+++ b/biome.json
@@ -0,0 +1,39 @@
+{
+  "$schema": "https://biomejs.dev/schemas/1.5.3/schema.json",
+  "organizeImports": {
+    "enabled": true
+  },
+  "linter": {
+    "enabled": true,
+    "rules": {
+      "recommended": true,
+      "suspicious": {
+        "noExplicitAny": "warn"
+      },
+      "style": {
+        "useTemplate": "error",
+        "useConst": "error"
+      }
+    }
+  },
+  "formatter": {
+    "enabled": true,
+    "indentStyle": "space",
+    "indentWidth": 2,
+    "lineWidth": 100
+  },
+  "javascript": {
+    "formatter": {
+      "quoteStyle": "single",
+      "semicolons": "always"
+    }
+  },
+  "files": {
+    "ignore": [
+      "dist",
+      "node_modules",
+      ".astro",
+      "coverage"
+    ]
+  }
+}
\ No newline at end of file
diff --git a/package-lock.json b/package-lock.json
index d265133..36d1dff 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -19,6 +19,7 @@
         "react-dom": "^19.1.0"
       },
       "devDependencies": {
+        "@biomejs/biome": "^1.9.4",
         "@types/supertest": "^6.0.3",
         "@vitest/coverage-v8": "^3.1.2",
         "supertest": "^7.1.0",
@@ -444,6 +445,170 @@
         "node": ">=18"
       }
     },
+    "node_modules/@biomejs/biome": {
+      "version": "1.9.4",
+      "resolved": "https://registry.npmjs.org/@biomejs/biome/-/biome-1.9.4.tgz",
+      "integrity": "sha512-1rkd7G70+o9KkTn5KLmDYXihGoTaIGO9PIIN2ZB7UJxFrWw04CZHPYiMRjYsaDvVV7hP1dYNRLxSANLaBFGpog==",
+      "dev": true,
+      "hasInstallScript": true,
+      "license": "MIT OR Apache-2.0",
+      "bin": {
+        "biome": "bin/biome"
+      },
+      "engines": {
+        "node": ">=14.21.3"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/biome"
+      },
+      "optionalDependencies": {
+        "@biomejs/cli-darwin-arm64": "1.9.4",
+        "@biomejs/cli-darwin-x64": "1.9.4",
+        "@biomejs/cli-linux-arm64": "1.9.4",
+        "@biomejs/cli-linux-arm64-musl": "1.9.4",
+        "@biomejs/cli-linux-x64": "1.9.4",
+        "@biomejs/cli-linux-x64-musl": "1.9.4",
+        "@biomejs/cli-win32-arm64": "1.9.4",
+        "@biomejs/cli-win32-x64": "1.9.4"
+      }
+    },
+    "node_modules/@biomejs/cli-darwin-arm64": {
+      "version": "1.9.4",
+      "resolved": "https://registry.npmjs.org/@biomejs/cli-darwin-arm64/-/cli-darwin-arm64-1.9.4.tgz",
+      "integrity": "sha512-bFBsPWrNvkdKrNCYeAp+xo2HecOGPAy9WyNyB/jKnnedgzl4W4Hb9ZMzYNbf8dMCGmUdSavlYHiR01QaYR58cw==",
+      "cpu": [
+        "arm64"
+      ],
+      "dev": true,
+      "license": "MIT OR Apache-2.0",
+      "optional": true,
+      "os": [
+        "darwin"
+      ],
+      "engines": {
+        "node": ">=14.21.3"
+      }
+    },
+    "node_modules/@biomejs/cli-darwin-x64": {
+      "version": "1.9.4",
+      "resolved": "https://registry.npmjs.org/@biomejs/cli-darwin-x64/-/cli-darwin-x64-1.9.4.tgz",
+      "integrity": "sha512-ngYBh/+bEedqkSevPVhLP4QfVPCpb+4BBe2p7Xs32dBgs7rh9nY2AIYUL6BgLw1JVXV8GlpKmb/hNiuIxfPfZg==",
+      "cpu": [
+        "x64"
+      ],
+      "dev": true,
+      "license": "MIT OR Apache-2.0",
+      "optional": true,
+      "os": [
+        "darwin"
+      ],
+      "engines": {
+        "node": ">=14.21.3"
+      }
+    },
+    "node_modules/@biomejs/cli-linux-arm64": {
+      "version": "1.9.4",
+      "resolved": "https://registry.npmjs.org/@biomejs/cli-linux-arm64/-/cli-linux-arm64-1.9.4.tgz",
+      "integrity": "sha512-fJIW0+LYujdjUgJJuwesP4EjIBl/N/TcOX3IvIHJQNsAqvV2CHIogsmA94BPG6jZATS4Hi+xv4SkBBQSt1N4/g==",
+      "cpu": [
+        "arm64"
+      ],
+      "dev": true,
+      "license": "MIT OR Apache-2.0",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": ">=14.21.3"
+      }
+    },
+    "node_modules/@biomejs/cli-linux-arm64-musl": {
+      "version": "1.9.4",
+      "resolved": "https://registry.npmjs.org/@biomejs/cli-linux-arm64-musl/-/cli-linux-arm64-musl-1.9.4.tgz",
+      "integrity": "sha512-v665Ct9WCRjGa8+kTr0CzApU0+XXtRgwmzIf1SeKSGAv+2scAlW6JR5PMFo6FzqqZ64Po79cKODKf3/AAmECqA==",
+      "cpu": [
+        "arm64"
+      ],
+      "dev": true,
+      "license": "MIT OR Apache-2.0",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": ">=14.21.3"
+      }
+    },
+    "node_modules/@biomejs/cli-linux-x64": {
+      "version": "1.9.4",
+      "resolved": "https://registry.npmjs.org/@biomejs/cli-linux-x64/-/cli-linux-x64-1.9.4.tgz",
+      "integrity": "sha512-lRCJv/Vi3Vlwmbd6K+oQ0KhLHMAysN8lXoCI7XeHlxaajk06u7G+UsFSO01NAs5iYuWKmVZjmiOzJ0OJmGsMwg==",
+      "cpu": [
+        "x64"
+      ],
+      "dev": true,
+      "license": "MIT OR Apache-2.0",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": ">=14.21.3"
+      }
+    },
+    "node_modules/@biomejs/cli-linux-x64-musl": {
+      "version": "1.9.4",
+      "resolved": "https://registry.npmjs.org/@biomejs/cli-linux-x64-musl/-/cli-linux-x64-musl-1.9.4.tgz",
+      "integrity": "sha512-gEhi/jSBhZ2m6wjV530Yy8+fNqG8PAinM3oV7CyO+6c3CEh16Eizm21uHVsyVBEB6RIM8JHIl6AGYCv6Q6Q9Tg==",
+      "cpu": [
+        "x64"
+      ],
+      "dev": true,
+      "license": "MIT OR Apache-2.0",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": ">=14.21.3"
+      }
+    },
+    "node_modules/@biomejs/cli-win32-arm64": {
+      "version": "1.9.4",
+      "resolved": "https://registry.npmjs.org/@biomejs/cli-win32-arm64/-/cli-win32-arm64-1.9.4.tgz",
+      "integrity": "sha512-tlbhLk+WXZmgwoIKwHIHEBZUwxml7bRJgk0X2sPyNR3S93cdRq6XulAZRQJ17FYGGzWne0fgrXBKpl7l4M87Hg==",
+      "cpu": [
+        "arm64"
+      ],
+      "dev": true,
+      "license": "MIT OR Apache-2.0",
+      "optional": true,
+      "os": [
+        "win32"
+      ],
+      "engines": {
+        "node": ">=14.21.3"
+      }
+    },
+    "node_modules/@biomejs/cli-win32-x64": {
+      "version": "1.9.4",
+      "resolved": "https://registry.npmjs.org/@biomejs/cli-win32-x64/-/cli-win32-x64-1.9.4.tgz",
+      "integrity": "sha512-8Y5wMhVIPaWe6jw2H+KlEm4wP/f7EW3810ZLmDlrEEy5KvBsb9ECEfu/kMWD484ijfQ8+nIi0giMgu9g1UAuuA==",
+      "cpu": [
+        "x64"
+      ],
+      "dev": true,
+      "license": "MIT OR Apache-2.0",
+      "optional": true,
+      "os": [
+        "win32"
+      ],
+      "engines": {
+        "node": ">=14.21.3"
+      }
+    },
     "node_modules/@capsizecss/unpack": {
       "version": "2.4.0",
       "resolved": "https://registry.npmjs.org/@capsizecss/unpack/-/unpack-2.4.0.tgz",
diff --git a/package.json b/package.json
index 82c96f3..164dbb1 100644
--- a/package.json
+++ b/package.json
@@ -8,7 +8,10 @@
     "preview": "astro preview",
     "astro": "astro",
     "test": "vitest",
-    "test:coverage": "vitest run --coverage"
+    "test:coverage": "vitest run --coverage",
+    "format": "biome format --write .",
+    "lint": "biome lint .",
+    "check": "biome check --apply ."
   },
   "dependencies": {
     "@astrojs/cloudflare": "^12.5.1",
@@ -22,10 +25,11 @@
     "react-dom": "^19.1.0"
   },
   "devDependencies": {
+    "@biomejs/biome": "^1.9.4",
     "@types/supertest": "^6.0.3",
     "@vitest/coverage-v8": "^3.1.2",
     "supertest": "^7.1.0",
     "vitest": "^3.1.2",
     "wrangler": "^4.13.1"
   }
-}
+}
\ No newline at end of file
diff --git a/tsconfig.json b/tsconfig.json
index 69c1600..92a18df 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -1,14 +1,9 @@
 {
   "extends": "astro/tsconfigs/strict",
-  "include": [
-    ".astro/types.d.ts",
-    "**/*"
-  ],
-  "exclude": [
-    "dist"
-  ],
+  "include": [".astro/types.d.ts", "**/*"],
+  "exclude": ["dist"],
   "compilerOptions": {
     "jsx": "react-jsx",
     "jsxImportSource": "react"
   }
-}
\ No newline at end of file
+}