diff --git a/.air.toml b/.air.toml
index 4d032b7..09d0e83 100644
--- a/.air.toml
+++ b/.air.toml
@@ -1,58 +1,27 @@
-#:schema https://json.schemastore.org/any.json
-
-env_files = []
+# Air config for Windows
 root = "."
-testdata_dir = "testdata"
 tmp_dir = "tmp"
 
 [build]
-  args_bin = []
   bin = "tmp/main.exe"
   cmd = "go build -o tmp/main.exe ."
   delay = 1000
-  entrypoint = []
-  exclude_dir = ["assets", "tmp", "vendor", "testdata"]
-  exclude_file = []
+  exclude_dir = ["assets", "tmp", "vendor", "testdata", "frontend", "internal/static/build"]
   exclude_regex = ["_test.go"]
-  exclude_unchanged = false
-  follow_symlink = false
-  full_bin = ""
-  ignore_dangerous_root_dir = false
-  include_dir = []
-  include_ext = ["go", "tpl", "tmpl", "html"]
-  include_file = []
+  include_ext = ["go"]
   kill_delay = "0s"
   log = "build-errors.log"
-  poll = false
-  poll_interval = 0
-  post_cmd = []
-  pre_cmd = []
-  rerun = false
-  rerun_delay = 500
-  send_interrupt = false
   stop_on_error = false
 
+[log]
+  time = false
+
 [color]
-  app = ""
   build = "yellow"
   main = "magenta"
   runner = "green"
   watcher = "cyan"
 
-[log]
-  main_only = false
-  silent = false
-  time = false
-
-[misc]
-  clean_on_exit = false
-
-[proxy]
-  app_port = 0
-  app_start_timeout = 0
-  enabled = false
-  proxy_port = 0
-
 [screen]
   clear_on_rebuild = false
   keep_scroll = true
diff --git a/.air.unix.toml b/.air.unix.toml
index b6f15ac..71590dc 100644
--- a/.air.unix.toml
+++ b/.air.unix.toml
@@ -11,7 +11,7 @@ tmp_dir = "tmp"
   cmd = "go build -o tmp/main ."
   delay = 1000
   entrypoint = []
-  exclude_dir = ["assets", "tmp", "vendor", "testdata"]
+  exclude_dir = ["assets", "tmp", "vendor", "testdata", "frontend", "internal/static/build"]
   exclude_file = []
   exclude_regex = ["_test.go"]
   exclude_unchanged = false
@@ -19,7 +19,7 @@ tmp_dir = "tmp"
   full_bin = ""
   ignore_dangerous_root_dir = false
   include_dir = []
-  include_ext = ["go", "tpl", "tmpl", "html"]
+  include_ext = ["go"]
   include_file = []
   kill_delay = "0s"
   log = "build-errors.log"
diff --git a/.gitignore b/.gitignore
index 33f44c0..15bbe45 100644
--- a/.gitignore
+++ b/.gitignore
@@ -20,3 +20,32 @@ __debug_bin*
 
 # Air
 tmp/
+
+# Frontend
+frontend/node_modules/
+frontend/build/
+frontend/.svelte-kit/
+internal/static/build/
+node_modules
+
+# Output
+.output
+.vercel
+.netlify
+.wrangler
+/.svelte-kit
+/build
+
+# OS
+.DS_Store
+Thumbs.db
+
+# Env
+.env
+.env.*
+!.env.example
+!.env.test
+
+# Vite
+vite.config.js.timestamp-*
+vite.config.ts.timestamp-*
diff --git a/CLAUDE.md b/CLAUDE.md
index 823e155..f0f844e 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -9,8 +9,8 @@ Self-hosted personal expense tracker built in Go with minimal dependencies. Goal
 - `golang.org/x/crypto/bcrypt` for password hashing
 
 ## Commands
-- `go run .` — start server
-- `go run scripts/dev.go` — hot reload (`.air.toml` on Windows, `.air.unix.toml` on Unix)
+- `go run scripts/dev.go` — dev (Vite + Go, cross-platform)
+- `go run scripts/build.go` — production build
 - `go build ./...` — verify compilation
 - `go vet ./...` — static analysis
 - `go fmt ./...` — format
diff --git a/frontend/.gitignore b/frontend/.gitignore
new file mode 100644
index 0000000..3b462cb
--- /dev/null
+++ b/frontend/.gitignore
@@ -0,0 +1,23 @@
+node_modules
+
+# Output
+.output
+.vercel
+.netlify
+.wrangler
+/.svelte-kit
+/build
+
+# OS
+.DS_Store
+Thumbs.db
+
+# Env
+.env
+.env.*
+!.env.example
+!.env.test
+
+# Vite
+vite.config.js.timestamp-*
+vite.config.ts.timestamp-*
diff --git a/frontend/.npmrc b/frontend/.npmrc
new file mode 100644
index 0000000..b6f27f1
--- /dev/null
+++ b/frontend/.npmrc
@@ -0,0 +1 @@
+engine-strict=true
diff --git a/frontend/package-lock.json b/frontend/package-lock.json
new file mode 100644
index 0000000..d157718
--- /dev/null
+++ b/frontend/package-lock.json
@@ -0,0 +1,1387 @@
+{
+	"name": "frontend",
+	"version": "0.0.1",
+	"lockfileVersion": 3,
+	"requires": true,
+	"packages": {
+		"": {
+			"name": "frontend",
+			"version": "0.0.1",
+			"devDependencies": {
+				"@sveltejs/adapter-auto": "^7.0.1",
+				"@sveltejs/adapter-static": "^3.0.10",
+				"@sveltejs/kit": "^2.57.0",
+				"@sveltejs/vite-plugin-svelte": "^7.0.0",
+				"svelte": "^5.55.2",
+				"svelte-check": "^4.4.6",
+				"typescript": "^6.0.2",
+				"vite": "^8.0.7"
+			}
+		},
+		"node_modules/@emnapi/core": {
+			"version": "1.10.0",
+			"resolved": "https://registry.npmjs.org/@emnapi/core/-/core-1.10.0.tgz",
+			"integrity": "sha512-yq6OkJ4p82CAfPl0u9mQebQHKPJkY7WrIuk205cTYnYe+k2Z8YBh11FrbRG/H6ihirqcacOgl2BIO8oyMQLeXw==",
+			"dev": true,
+			"license": "MIT",
+			"optional": true,
+			"dependencies": {
+				"@emnapi/wasi-threads": "1.2.1",
+				"tslib": "^2.4.0"
+			}
+		},
+		"node_modules/@emnapi/runtime": {
+			"version": "1.10.0",
+			"resolved": "https://registry.npmjs.org/@emnapi/runtime/-/runtime-1.10.0.tgz",
+			"integrity": "sha512-ewvYlk86xUoGI0zQRNq/mC+16R1QeDlKQy21Ki3oSYXNgLb45GV1P6A0M+/s6nyCuNDqe5VpaY84BzXGwVbwFA==",
+			"dev": true,
+			"license": "MIT",
+			"optional": true,
+			"dependencies": {
+				"tslib": "^2.4.0"
+			}
+		},
+		"node_modules/@emnapi/wasi-threads": {
+			"version": "1.2.1",
+			"resolved": "https://registry.npmjs.org/@emnapi/wasi-threads/-/wasi-threads-1.2.1.tgz",
+			"integrity": "sha512-uTII7OYF+/Mes/MrcIOYp5yOtSMLBWSIoLPpcgwipoiKbli6k322tcoFsxoIIxPDqW01SQGAgko4EzZi2BNv2w==",
+			"dev": true,
+			"license": "MIT",
+			"optional": true,
+			"dependencies": {
+				"tslib": "^2.4.0"
+			}
+		},
+		"node_modules/@jridgewell/gen-mapping": {
+			"version": "0.3.13",
+			"resolved": "https://registry.npmjs.org/@jridgewell/gen-mapping/-/gen-mapping-0.3.13.tgz",
+			"integrity": "sha512-2kkt/7niJ6MgEPxF0bYdQ6etZaA+fQvDcLKckhy1yIQOzaoKjBBjSj63/aLVjYE3qhRt5dvM+uUyfCg6UKCBbA==",
+			"dev": true,
+			"license": "MIT",
+			"dependencies": {
+				"@jridgewell/sourcemap-codec": "^1.5.0",
+				"@jridgewell/trace-mapping": "^0.3.24"
+			}
+		},
+		"node_modules/@jridgewell/remapping": {
+			"version": "2.3.5",
+			"resolved": "https://registry.npmjs.org/@jridgewell/remapping/-/remapping-2.3.5.tgz",
+			"integrity": "sha512-LI9u/+laYG4Ds1TDKSJW2YPrIlcVYOwi2fUC6xB43lueCjgxV4lffOCZCtYFiH6TNOX+tQKXx97T4IKHbhyHEQ==",
+			"dev": true,
+			"license": "MIT",
+			"dependencies": {
+				"@jridgewell/gen-mapping": "^0.3.5",
+				"@jridgewell/trace-mapping": "^0.3.24"
+			}
+		},
+		"node_modules/@jridgewell/resolve-uri": {
+			"version": "3.1.2",
+			"resolved": "https://registry.npmjs.org/@jridgewell/resolve-uri/-/resolve-uri-3.1.2.tgz",
+			"integrity": "sha512-bRISgCIjP20/tbWSPWMEi54QVPRZExkuD9lJL+UIxUKtwVJA8wW1Trb1jMs1RFXo1CBTNZ/5hpC9QvmKWdopKw==",
+			"dev": true,
+			"license": "MIT",
+			"engines": {
+				"node": ">=6.0.0"
+			}
+		},
+		"node_modules/@jridgewell/sourcemap-codec": {
+			"version": "1.5.5",
+			"resolved": "https://registry.npmjs.org/@jridgewell/sourcemap-codec/-/sourcemap-codec-1.5.5.tgz",
+			"integrity": "sha512-cYQ9310grqxueWbl+WuIUIaiUaDcj7WOq5fVhEljNVgRfOUhY9fy2zTvfoqWsnebh8Sl70VScFbICvJnLKB0Og==",
+			"dev": true,
+			"license": "MIT"
+		},
+		"node_modules/@jridgewell/trace-mapping": {
+			"version": "0.3.31",
+			"resolved": "https://registry.npmjs.org/@jridgewell/trace-mapping/-/trace-mapping-0.3.31.tgz",
+			"integrity": "sha512-zzNR+SdQSDJzc8joaeP8QQoCQr8NuYx2dIIytl1QeBEZHJ9uW6hebsrYgbz8hJwUQao3TWCMtmfV8Nu1twOLAw==",
+			"dev": true,
+			"license": "MIT",
+			"dependencies": {
+				"@jridgewell/resolve-uri": "^3.1.0",
+				"@jridgewell/sourcemap-codec": "^1.4.14"
+			}
+		},
+		"node_modules/@napi-rs/wasm-runtime": {
+			"version": "1.1.4",
+			"resolved": "https://registry.npmjs.org/@napi-rs/wasm-runtime/-/wasm-runtime-1.1.4.tgz",
+			"integrity": "sha512-3NQNNgA1YSlJb/kMH1ildASP9HW7/7kYnRI2szWJaofaS1hWmbGI4H+d3+22aGzXXN9IJ+n+GiFVcGipJP18ow==",
+			"dev": true,
+			"license": "MIT",
+			"optional": true,
+			"dependencies": {
+				"@tybys/wasm-util": "^0.10.1"
+			},
+			"funding": {
+				"type": "github",
+				"url": "https://github.com/sponsors/Brooooooklyn"
+			},
+			"peerDependencies": {
+				"@emnapi/core": "^1.7.1",
+				"@emnapi/runtime": "^1.7.1"
+			}
+		},
+		"node_modules/@oxc-project/types": {
+			"version": "0.127.0",
+			"resolved": "https://registry.npmjs.org/@oxc-project/types/-/types-0.127.0.tgz",
+			"integrity": "sha512-aIYXQBo4lCbO4z0R3FHeucQHpF46l2LbMdxRvqvuRuW2OxdnSkcng5B8+K12spgLDj93rtN3+J2Vac/TIO+ciQ==",
+			"dev": true,
+			"license": "MIT",
+			"funding": {
+				"url": "https://github.com/sponsors/Boshen"
+			}
+		},
+		"node_modules/@polka/url": {
+			"version": "1.0.0-next.29",
+			"resolved": "https://registry.npmjs.org/@polka/url/-/url-1.0.0-next.29.tgz",
+			"integrity": "sha512-wwQAWhWSuHaag8c4q/KN/vCoeOJYshAIvMQwD4GpSb3OiZklFfvAgmj0VCBBImRpuF/aFgIRzllXlVX93Jevww==",
+			"dev": true,
+			"license": "MIT"
+		},
+		"node_modules/@rolldown/binding-android-arm64": {
+			"version": "1.0.0-rc.17",
+			"resolved": "https://registry.npmjs.org/@rolldown/binding-android-arm64/-/binding-android-arm64-1.0.0-rc.17.tgz",
+			"integrity": "sha512-s70pVGhw4zqGeFnXWvAzJDlvxhlRollagdCCKRgOsgUOH3N1l0LIxf83AtGzmb5SiVM4Hjl5HyarMRfdfj3DaQ==",
+			"cpu": [
+				"arm64"
+			],
+			"dev": true,
+			"license": "MIT",
+			"optional": true,
+			"os": [
+				"android"
+			],
+			"engines": {
+				"node": "^20.19.0 || >=22.12.0"
+			}
+		},
+		"node_modules/@rolldown/binding-darwin-arm64": {
+			"version": "1.0.0-rc.17",
+			"resolved": "https://registry.npmjs.org/@rolldown/binding-darwin-arm64/-/binding-darwin-arm64-1.0.0-rc.17.tgz",
+			"integrity": "sha512-4ksWc9n0mhlZpZ9PMZgTGjeOPRu8MB1Z3Tz0Mo02eWfWCHMW1zN82Qz/pL/rC+yQa+8ZnutMF0JjJe7PjwasYw==",
+			"cpu": [
+				"arm64"
+			],
+			"dev": true,
+			"license": "MIT",
+			"optional": true,
+			"os": [
+				"darwin"
+			],
+			"engines": {
+				"node": "^20.19.0 || >=22.12.0"
+			}
+		},
+		"node_modules/@rolldown/binding-darwin-x64": {
+			"version": "1.0.0-rc.17",
+			"resolved": "https://registry.npmjs.org/@rolldown/binding-darwin-x64/-/binding-darwin-x64-1.0.0-rc.17.tgz",
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+			"cpu": [
+				"x64"
+			],
+			"dev": true,
+			"license": "MIT",
+			"optional": true,
+			"os": [
+				"darwin"
+			],
+			"engines": {
+				"node": "^20.19.0 || >=22.12.0"
+			}
+		},
+		"node_modules/@rolldown/binding-freebsd-x64": {
+			"version": "1.0.0-rc.17",
+			"resolved": "https://registry.npmjs.org/@rolldown/binding-freebsd-x64/-/binding-freebsd-x64-1.0.0-rc.17.tgz",
+			"integrity": "sha512-hwnz3nw9dbJ05EDO/PvcjaaewqqDy7Y1rn1UO81l8iIK1GjenME75dl16ajbvSSMfv66WXSRCYKIqfgq2KCfxw==",
+			"cpu": [
+				"x64"
+			],
+			"dev": true,
+			"license": "MIT",
+			"optional": true,
+			"os": [
+				"freebsd"
+			],
+			"engines": {
+				"node": "^20.19.0 || >=22.12.0"
+			}
+		},
+		"node_modules/@rolldown/binding-linux-arm-gnueabihf": {
+			"version": "1.0.0-rc.17",
+			"resolved": "https://registry.npmjs.org/@rolldown/binding-linux-arm-gnueabihf/-/binding-linux-arm-gnueabihf-1.0.0-rc.17.tgz",
+			"integrity": "sha512-IS+W7epTcwANmFSQFrS1SivEXHtl1JtuQA9wlxrZTcNi6mx+FDOYrakGevvvTwgj2JvWiK8B29/qD9BELZPyXQ==",
+			"cpu": [
+				"arm"
+			],
+			"dev": true,
+			"license": "MIT",
+			"optional": true,
+			"os": [
+				"linux"
+			],
+			"engines": {
+				"node": "^20.19.0 || >=22.12.0"
+			}
+		},
+		"node_modules/@rolldown/binding-linux-arm64-gnu": {
+			"version": "1.0.0-rc.17",
+			"resolved": "https://registry.npmjs.org/@rolldown/binding-linux-arm64-gnu/-/binding-linux-arm64-gnu-1.0.0-rc.17.tgz",
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+			"cpu": [
+				"arm64"
+			],
+			"dev": true,
+			"license": "MIT",
+			"optional": true,
+			"os": [
+				"linux"
+			],
+			"engines": {
+				"node": "^20.19.0 || >=22.12.0"
+			}
+		},
+		"node_modules/@rolldown/binding-linux-arm64-musl": {
+			"version": "1.0.0-rc.17",
+			"resolved": "https://registry.npmjs.org/@rolldown/binding-linux-arm64-musl/-/binding-linux-arm64-musl-1.0.0-rc.17.tgz",
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+				"arm64"
+			],
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+			"license": "MIT",
+			"optional": true,
+			"os": [
+				"linux"
+			],
+			"engines": {
+				"node": "^20.19.0 || >=22.12.0"
+			}
+		},
+		"node_modules/@rolldown/binding-linux-ppc64-gnu": {
+			"version": "1.0.0-rc.17",
+			"resolved": "https://registry.npmjs.org/@rolldown/binding-linux-ppc64-gnu/-/binding-linux-ppc64-gnu-1.0.0-rc.17.tgz",
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+			"cpu": [
+				"ppc64"
+			],
+			"dev": true,
+			"license": "MIT",
+			"optional": true,
+			"os": [
+				"linux"
+			],
+			"engines": {
+				"node": "^20.19.0 || >=22.12.0"
+			}
+		},
+		"node_modules/@rolldown/binding-linux-s390x-gnu": {
+			"version": "1.0.0-rc.17",
+			"resolved": "https://registry.npmjs.org/@rolldown/binding-linux-s390x-gnu/-/binding-linux-s390x-gnu-1.0.0-rc.17.tgz",
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+			"cpu": [
+				"s390x"
+			],
+			"dev": true,
+			"license": "MIT",
+			"optional": true,
+			"os": [
+				"linux"
+			],
+			"engines": {
+				"node": "^20.19.0 || >=22.12.0"
+			}
+		},
+		"node_modules/@rolldown/binding-linux-x64-gnu": {
+			"version": "1.0.0-rc.17",
+			"resolved": "https://registry.npmjs.org/@rolldown/binding-linux-x64-gnu/-/binding-linux-x64-gnu-1.0.0-rc.17.tgz",
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+			"cpu": [
+				"x64"
+			],
+			"dev": true,
+			"license": "MIT",
+			"optional": true,
+			"os": [
+				"linux"
+			],
+			"engines": {
+				"node": "^20.19.0 || >=22.12.0"
+			}
+		},
+		"node_modules/@rolldown/binding-linux-x64-musl": {
+			"version": "1.0.0-rc.17",
+			"resolved": "https://registry.npmjs.org/@rolldown/binding-linux-x64-musl/-/binding-linux-x64-musl-1.0.0-rc.17.tgz",
+			"integrity": "sha512-0phclDw1spsL7dUB37sIARuis2tAgomCJXAHZlpt8PXZ4Ba0dRP1e+66lsRqrfhISeN9bEGNjQs+T/Fbd7oYGw==",
+			"cpu": [
+				"x64"
+			],
+			"dev": true,
+			"license": "MIT",
+			"optional": true,
+			"os": [
+				"linux"
+			],
+			"engines": {
+				"node": "^20.19.0 || >=22.12.0"
+			}
+		},
+		"node_modules/@rolldown/binding-openharmony-arm64": {
+			"version": "1.0.0-rc.17",
+			"resolved": "https://registry.npmjs.org/@rolldown/binding-openharmony-arm64/-/binding-openharmony-arm64-1.0.0-rc.17.tgz",
+			"integrity": "sha512-0ag/hEgXOwgw4t8QyQvUCxvEg+V0KBcA6YuOx9g0r02MprutRF5dyljgm3EmR02O292UX7UeS6HzWHAl6KgyhA==",
+			"cpu": [
+				"arm64"
+			],
+			"dev": true,
+			"license": "MIT",
+			"optional": true,
+			"os": [
+				"openharmony"
+			],
+			"engines": {
+				"node": "^20.19.0 || >=22.12.0"
+			}
+		},
+		"node_modules/@rolldown/binding-wasm32-wasi": {
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+			"dev": true,
+			"license": "MIT",
+			"dependencies": {
+				"fdir": "^6.5.0",
+				"picomatch": "^4.0.4"
+			},
+			"engines": {
+				"node": ">=12.0.0"
+			},
+			"funding": {
+				"url": "https://github.com/sponsors/SuperchupuDev"
+			}
+		},
+		"node_modules/totalist": {
+			"version": "3.0.1",
+			"resolved": "https://registry.npmjs.org/totalist/-/totalist-3.0.1.tgz",
+			"integrity": "sha512-sf4i37nQ2LBx4m3wB74y+ubopq6W/dIzXg0FDGjsYnZHVa1Da8FH853wlL2gtUhg+xJXjfk3kUZS3BRoQeoQBQ==",
+			"dev": true,
+			"license": "MIT",
+			"engines": {
+				"node": ">=6"
+			}
+		},
+		"node_modules/tslib": {
+			"version": "2.8.1",
+			"resolved": "https://registry.npmjs.org/tslib/-/tslib-2.8.1.tgz",
+			"integrity": "sha512-oJFu94HQb+KVduSUQL7wnpmqnfmLsOA/nAh6b6EH0wCEoK0/mPeXU6c3wKDV83MkOuHPRHtSXKKU99IBazS/2w==",
+			"dev": true,
+			"license": "0BSD",
+			"optional": true
+		},
+		"node_modules/typescript": {
+			"version": "6.0.3",
+			"resolved": "https://registry.npmjs.org/typescript/-/typescript-6.0.3.tgz",
+			"integrity": "sha512-y2TvuxSZPDyQakkFRPZHKFm+KKVqIisdg9/CZwm9ftvKXLP8NRWj38/ODjNbr43SsoXqNuAisEf1GdCxqWcdBw==",
+			"dev": true,
+			"license": "Apache-2.0",
+			"bin": {
+				"tsc": "bin/tsc",
+				"tsserver": "bin/tsserver"
+			},
+			"engines": {
+				"node": ">=14.17"
+			}
+		},
+		"node_modules/vite": {
+			"version": "8.0.10",
+			"resolved": "https://registry.npmjs.org/vite/-/vite-8.0.10.tgz",
+			"integrity": "sha512-rZuUu9j6J5uotLDs+cAA4O5H4K1SfPliUlQwqa6YEwSrWDZzP4rhm00oJR5snMewjxF5V/K3D4kctsUTsIU9Mw==",
+			"dev": true,
+			"license": "MIT",
+			"dependencies": {
+				"lightningcss": "^1.32.0",
+				"picomatch": "^4.0.4",
+				"postcss": "^8.5.10",
+				"rolldown": "1.0.0-rc.17",
+				"tinyglobby": "^0.2.16"
+			},
+			"bin": {
+				"vite": "bin/vite.js"
+			},
+			"engines": {
+				"node": "^20.19.0 || >=22.12.0"
+			},
+			"funding": {
+				"url": "https://github.com/vitejs/vite?sponsor=1"
+			},
+			"optionalDependencies": {
+				"fsevents": "~2.3.3"
+			},
+			"peerDependencies": {
+				"@types/node": "^20.19.0 || >=22.12.0",
+				"@vitejs/devtools": "^0.1.0",
+				"esbuild": "^0.27.0 || ^0.28.0",
+				"jiti": ">=1.21.0",
+				"less": "^4.0.0",
+				"sass": "^1.70.0",
+				"sass-embedded": "^1.70.0",
+				"stylus": ">=0.54.8",
+				"sugarss": "^5.0.0",
+				"terser": "^5.16.0",
+				"tsx": "^4.8.1",
+				"yaml": "^2.4.2"
+			},
+			"peerDependenciesMeta": {
+				"@types/node": {
+					"optional": true
+				},
+				"@vitejs/devtools": {
+					"optional": true
+				},
+				"esbuild": {
+					"optional": true
+				},
+				"jiti": {
+					"optional": true
+				},
+				"less": {
+					"optional": true
+				},
+				"sass": {
+					"optional": true
+				},
+				"sass-embedded": {
+					"optional": true
+				},
+				"stylus": {
+					"optional": true
+				},
+				"sugarss": {
+					"optional": true
+				},
+				"terser": {
+					"optional": true
+				},
+				"tsx": {
+					"optional": true
+				},
+				"yaml": {
+					"optional": true
+				}
+			}
+		},
+		"node_modules/vitefu": {
+			"version": "1.1.3",
+			"resolved": "https://registry.npmjs.org/vitefu/-/vitefu-1.1.3.tgz",
+			"integrity": "sha512-ub4okH7Z5KLjb6hDyjqrGXqWtWvoYdU3IGm/NorpgHncKoLTCfRIbvlhBm7r0YstIaQRYlp4yEbFqDcKSzXSSg==",
+			"dev": true,
+			"license": "MIT",
+			"workspaces": [
+				"tests/deps/*",
+				"tests/projects/*",
+				"tests/projects/workspace/packages/*"
+			],
+			"peerDependencies": {
+				"vite": "^3.0.0 || ^4.0.0 || ^5.0.0 || ^6.0.0 || ^7.0.0 || ^8.0.0"
+			},
+			"peerDependenciesMeta": {
+				"vite": {
+					"optional": true
+				}
+			}
+		},
+		"node_modules/zimmerframe": {
+			"version": "1.1.4",
+			"resolved": "https://registry.npmjs.org/zimmerframe/-/zimmerframe-1.1.4.tgz",
+			"integrity": "sha512-B58NGBEoc8Y9MWWCQGl/gq9xBCe4IiKM0a2x7GZdQKOW5Exr8S1W24J6OgM1njK8xCRGvAJIL/MxXHf6SkmQKQ==",
+			"dev": true,
+			"license": "MIT"
+		}
+	}
+}
diff --git a/frontend/package.json b/frontend/package.json
new file mode 100644
index 0000000..c9a5ccb
--- /dev/null
+++ b/frontend/package.json
@@ -0,0 +1,24 @@
+{
+	"name": "frontend",
+	"private": true,
+	"version": "0.0.1",
+	"type": "module",
+	"scripts": {
+		"dev": "vite dev",
+		"build": "vite build",
+		"preview": "vite preview",
+		"prepare": "svelte-kit sync || echo ''",
+		"check": "svelte-kit sync && svelte-check --tsconfig ./tsconfig.json",
+		"check:watch": "svelte-kit sync && svelte-check --tsconfig ./tsconfig.json --watch"
+	},
+	"devDependencies": {
+		"@sveltejs/adapter-auto": "^7.0.1",
+		"@sveltejs/adapter-static": "^3.0.10",
+		"@sveltejs/kit": "^2.57.0",
+		"@sveltejs/vite-plugin-svelte": "^7.0.0",
+		"svelte": "^5.55.2",
+		"svelte-check": "^4.4.6",
+		"typescript": "^6.0.2",
+		"vite": "^8.0.7"
+	}
+}
diff --git a/frontend/src/app.css b/frontend/src/app.css
new file mode 100644
index 0000000..fc0f0c8
--- /dev/null
+++ b/frontend/src/app.css
@@ -0,0 +1,35 @@
+label {
+	display: flex;
+	flex-direction: column;
+	gap: 0.25rem;
+	font-size: 0.875rem;
+	font-weight: 500;
+}
+
+input {
+	padding: 0.5rem;
+	border: 1px solid #d1d5db;
+	border-radius: 4px;
+	font-size: 1rem;
+}
+
+button[type='submit'] {
+	padding: 0.625rem;
+	background: #111827;
+	color: white;
+	border: none;
+	border-radius: 4px;
+	font-size: 1rem;
+	cursor: pointer;
+}
+
+button[type='submit']:disabled {
+	opacity: 0.6;
+	cursor: not-allowed;
+}
+
+.error {
+	color: #dc2626;
+	font-size: 0.875rem;
+	margin: 0;
+}
diff --git a/frontend/src/app.d.ts b/frontend/src/app.d.ts
new file mode 100644
index 0000000..da08e6d
--- /dev/null
+++ b/frontend/src/app.d.ts
@@ -0,0 +1,13 @@
+// See https://svelte.dev/docs/kit/types#app.d.ts
+// for information about these interfaces
+declare global {
+	namespace App {
+		// interface Error {}
+		// interface Locals {}
+		// interface PageData {}
+		// interface PageState {}
+		// interface Platform {}
+	}
+}
+
+export {};
diff --git a/frontend/src/app.html b/frontend/src/app.html
new file mode 100644
index 0000000..6a2bb58
--- /dev/null
+++ b/frontend/src/app.html
@@ -0,0 +1,12 @@
+<!doctype html>
+<html lang="en">
+	<head>
+		<meta charset="utf-8" />
+		<meta name="viewport" content="width=device-width, initial-scale=1" />
+		<meta name="text-scale" content="scale" />
+		%sveltekit.head%
+	</head>
+	<body data-sveltekit-preload-data="hover">
+		<div style="display: contents">%sveltekit.body%</div>
+	</body>
+</html>
diff --git a/frontend/src/lib/api.ts b/frontend/src/lib/api.ts
new file mode 100644
index 0000000..d86ebf4
--- /dev/null
+++ b/frontend/src/lib/api.ts
@@ -0,0 +1,44 @@
+import { goto } from '$app/navigation';
+import { clearToken, getToken } from './auth';
+import type { ApiList, ApiResponse } from './types';
+
+async function apiFetch<T>(path: string, init: RequestInit = {}): Promise<T> {
+	const token = getToken();
+	const headers: Record<string, string> = {
+		'Content-Type': 'application/json',
+		...(init.headers as Record<string, string> | undefined),
+	};
+	if (token) {
+		headers['Authorization'] = `Bearer ${token}`;
+	}
+
+	const res = await fetch(path, { ...init, headers });
+
+	if (res.status === 401) {
+		clearToken();
+		goto('/login');
+		throw new Error('unauthorized');
+	}
+
+	if (!res.ok) {
+		throw new Error(`${res.status} ${res.statusText}`);
+	}
+
+	return res.json() as Promise<T>;
+}
+
+export function get<T>(path: string): Promise<ApiResponse<T>> {
+	return apiFetch<ApiResponse<T>>(path);
+}
+
+export function getList<T>(path: string): Promise<ApiList<T>> {
+	return apiFetch<ApiList<T>>(path);
+}
+
+export function post<T>(path: string, body: unknown): Promise<ApiResponse<T>> {
+	return apiFetch<ApiResponse<T>>(path, {
+		method: 'POST',
+		body: JSON.stringify(body),
+	});
+}
+
diff --git a/frontend/src/lib/auth.ts b/frontend/src/lib/auth.ts
new file mode 100644
index 0000000..0b0dcad
--- /dev/null
+++ b/frontend/src/lib/auth.ts
@@ -0,0 +1,21 @@
+const TOKEN_KEY = 'token';
+const USER_ID_KEY = 'user_id';
+
+export function getToken(): string | null {
+	return localStorage.getItem(TOKEN_KEY);
+}
+
+export function getUserId(): number | null {
+	const id = localStorage.getItem(USER_ID_KEY);
+	return id ? parseInt(id, 10) : null;
+}
+
+export function setToken(token: string, userId: number): void {
+	localStorage.setItem(TOKEN_KEY, token);
+	localStorage.setItem(USER_ID_KEY, String(userId));
+}
+
+export function clearToken(): void {
+	localStorage.removeItem(TOKEN_KEY);
+	localStorage.removeItem(USER_ID_KEY);
+}
diff --git a/frontend/src/lib/types.ts b/frontend/src/lib/types.ts
new file mode 100644
index 0000000..077f1e6
--- /dev/null
+++ b/frontend/src/lib/types.ts
@@ -0,0 +1,34 @@
+export interface ApiResponse<T> {
+	success: boolean;
+	data: T;
+	error?: string;
+}
+
+export interface ApiList<T> {
+	success: boolean;
+	data: T[];
+	meta: { count: number };
+}
+
+export interface User {
+	id: number;
+	name: string;
+	email: string;
+	created_at: string;
+}
+
+export interface Expense {
+	id: number;
+	group_id?: number;
+	paid_by: number;
+	description: string;
+	amount: number;
+	date: string;
+	created_at: string;
+}
+
+export interface LoginResponse {
+	token: string;
+	user_id: number;
+	expires_at: string;
+}
diff --git a/frontend/src/routes/+layout.svelte b/frontend/src/routes/+layout.svelte
new file mode 100644
index 0000000..5752312
--- /dev/null
+++ b/frontend/src/routes/+layout.svelte
@@ -0,0 +1,62 @@
+<script lang="ts">
+	import '../app.css';
+	import { page } from '$app/state';
+	import { goto } from '$app/navigation';
+	import { getToken, clearToken } from '$lib/auth';
+	import { onMount } from 'svelte';
+
+	const publicRoutes = ['/login', '/register'];
+
+	let { children } = $props();
+
+	onMount(() => {
+		if (!publicRoutes.includes(page.url.pathname) && !getToken()) {
+			goto('/login');
+		}
+	});
+
+	function logout() {
+		clearToken();
+		goto('/login');
+	}
+</script>
+
+{#if !publicRoutes.includes(page.url.pathname)}
+	<nav>
+		<a href="/">Expenses</a>
+		<button onclick={logout}>Logout</button>
+	</nav>
+{/if}
+
+<main>
+	{@render children()}
+</main>
+
+<style>
+	nav {
+		display: flex;
+		gap: 1rem;
+		padding: 0.875rem 1.5rem;
+		border-bottom: 1px solid #e5e7eb;
+		align-items: center;
+	}
+	nav a {
+		text-decoration: none;
+		color: inherit;
+		font-weight: 500;
+	}
+	nav button {
+		margin-left: auto;
+		background: none;
+		border: 1px solid #d1d5db;
+		padding: 0.25rem 0.75rem;
+		border-radius: 4px;
+		cursor: pointer;
+		font-size: 0.875rem;
+	}
+	main {
+		max-width: 800px;
+		margin: 2rem auto;
+		padding: 0 1rem;
+	}
+</style>
diff --git a/frontend/src/routes/+layout.ts b/frontend/src/routes/+layout.ts
new file mode 100644
index 0000000..83addb7
--- /dev/null
+++ b/frontend/src/routes/+layout.ts
@@ -0,0 +1,2 @@
+export const ssr = false;
+export const prerender = false;
diff --git a/frontend/src/routes/+page.svelte b/frontend/src/routes/+page.svelte
new file mode 100644
index 0000000..cea24e1
--- /dev/null
+++ b/frontend/src/routes/+page.svelte
@@ -0,0 +1,100 @@
+<script lang="ts">
+	import { onMount } from 'svelte';
+	import { getList } from '$lib/api';
+	import { getUserId } from '$lib/auth';
+	import type { Expense } from '$lib/types';
+
+	let expenses = $state<Expense[]>([]);
+	let error = $state('');
+	let loading = $state(true);
+
+	onMount(async () => {
+		const userId = getUserId();
+		if (!userId) return;
+		try {
+			const res = await getList<Expense>(`/api/expenses?user_id=${userId}`);
+			expenses = res.data ?? [];
+		} catch {
+			error = 'Failed to load expenses';
+		} finally {
+			loading = false;
+		}
+	});
+
+	function formatAmount(amount: number): string {
+		return new Intl.NumberFormat('en-US', { style: 'currency', currency: 'USD' }).format(amount);
+	}
+</script>
+
+<div class="header">
+	<h1>Expenses</h1>
+	<a href="/expenses/new" class="btn">+ Add</a>
+</div>
+
+{#if loading}
+	<p class="muted">Loading...</p>
+{:else if error}
+	<p class="error">{error}</p>
+{:else if expenses.length === 0}
+	<p class="muted">No expenses yet. <a href="/expenses/new">Add one.</a></p>
+{:else}
+	<table>
+		<thead>
+			<tr>
+				<th>Description</th>
+				<th>Date</th>
+				<th class="right">Amount</th>
+			</tr>
+		</thead>
+		<tbody>
+			{#each expenses as expense}
+				<tr>
+					<td>{expense.description}</td>
+					<td>{expense.date}</td>
+					<td class="right">{formatAmount(expense.amount)}</td>
+				</tr>
+			{/each}
+		</tbody>
+	</table>
+{/if}
+
+<style>
+	.header {
+		display: flex;
+		justify-content: space-between;
+		align-items: center;
+		margin-bottom: 1.5rem;
+	}
+	.btn {
+		padding: 0.5rem 1rem;
+		background: #111827;
+		color: white;
+		text-decoration: none;
+		border-radius: 4px;
+		font-size: 0.875rem;
+	}
+	table {
+		width: 100%;
+		border-collapse: collapse;
+	}
+	th,
+	td {
+		text-align: left;
+		padding: 0.75rem;
+		border-bottom: 1px solid #e5e7eb;
+	}
+	th {
+		font-weight: 600;
+		font-size: 0.875rem;
+		color: #6b7280;
+	}
+	.right {
+		text-align: right;
+	}
+	.error {
+		color: #dc2626;
+	}
+	.muted {
+		color: #6b7280;
+	}
+</style>
diff --git a/frontend/src/routes/expenses/new/+page.svelte b/frontend/src/routes/expenses/new/+page.svelte
new file mode 100644
index 0000000..c6ed144
--- /dev/null
+++ b/frontend/src/routes/expenses/new/+page.svelte
@@ -0,0 +1,88 @@
+<script lang="ts">
+	import { goto } from '$app/navigation';
+	import { post } from '$lib/api';
+	import { getUserId } from '$lib/auth';
+	import type { Expense } from '$lib/types';
+
+	let description = $state('');
+	let amount = $state('');
+	let date = $state(new Date().toISOString().split('T')[0]);
+	let error = $state('');
+	let loading = $state(false);
+
+	async function handleSubmit(e: SubmitEvent) {
+		e.preventDefault();
+		error = '';
+		loading = true;
+		const userId = getUserId();
+		if (!userId) {
+			error = 'Not authenticated';
+			loading = false;
+			return;
+		}
+		try {
+			const res = await post<Expense>('/api/expenses', {
+				paid_by: userId,
+				description,
+				amount: parseFloat(amount),
+				date,
+			});
+			if (!res.success) {
+				error = res.error ?? 'Failed to create expense';
+				return;
+			}
+			goto('/');
+		} catch {
+			error = 'Failed to create expense';
+		} finally {
+			loading = false;
+		}
+	}
+</script>
+
+<div class="header">
+	<a href="/" class="back">← Back</a>
+	<h1>New expense</h1>
+</div>
+
+<form onsubmit={handleSubmit}>
+	<label>
+		Description
+		<input type="text" bind:value={description} required />
+	</label>
+	<label>
+		Amount
+		<input type="number" bind:value={amount} min="0.01" step="0.01" required />
+	</label>
+	<label>
+		Date
+		<input type="date" bind:value={date} required />
+	</label>
+	{#if error}<p class="error">{error}</p>{/if}
+	<button type="submit" disabled={loading}>
+		{loading ? 'Saving...' : 'Add expense'}
+	</button>
+</form>
+
+<style>
+	.header {
+		display: flex;
+		align-items: center;
+		gap: 1rem;
+		margin-bottom: 1.5rem;
+	}
+	.back {
+		color: #6b7280;
+		text-decoration: none;
+		font-size: 0.875rem;
+	}
+	h1 {
+		margin: 0;
+	}
+	form {
+		display: flex;
+		flex-direction: column;
+		gap: 1rem;
+		max-width: 400px;
+	}
+</style>
diff --git a/frontend/src/routes/login/+page.svelte b/frontend/src/routes/login/+page.svelte
new file mode 100644
index 0000000..3590c62
--- /dev/null
+++ b/frontend/src/routes/login/+page.svelte
@@ -0,0 +1,68 @@
+<script lang="ts">
+	import { goto } from '$app/navigation';
+	import { post } from '$lib/api';
+	import { setToken } from '$lib/auth';
+	import type { LoginResponse } from '$lib/types';
+
+	let email = $state('');
+	let password = $state('');
+	let error = $state('');
+	let loading = $state(false);
+
+	async function handleSubmit(e: SubmitEvent) {
+		e.preventDefault();
+		error = '';
+		loading = true;
+		try {
+			const res = await post<LoginResponse>('/api/auth/login', { email, password });
+			if (!res.success) {
+				error = res.error ?? 'Login failed';
+				return;
+			}
+			setToken(res.data.token, res.data.user_id);
+			goto('/');
+		} catch {
+			error = 'Login failed';
+		} finally {
+			loading = false;
+		}
+	}
+</script>
+
+<div class="container">
+	<h1>Sign in</h1>
+	<form onsubmit={handleSubmit}>
+		<label>
+			Email
+			<input type="email" bind:value={email} required />
+		</label>
+		<label>
+			Password
+			<input type="password" bind:value={password} required />
+		</label>
+		{#if error}<p class="error">{error}</p>{/if}
+		<button type="submit" disabled={loading}>
+			{loading ? 'Signing in...' : 'Sign in'}
+		</button>
+	</form>
+	<p><a href="/register">Create account</a></p>
+</div>
+
+<style>
+	.container {
+		max-width: 360px;
+		margin: 4rem auto;
+	}
+	h1 {
+		margin-bottom: 1.5rem;
+	}
+	form {
+		display: flex;
+		flex-direction: column;
+		gap: 1rem;
+	}
+	p {
+		margin-top: 1rem;
+		font-size: 0.875rem;
+	}
+</style>
diff --git a/frontend/src/routes/register/+page.svelte b/frontend/src/routes/register/+page.svelte
new file mode 100644
index 0000000..32ed94a
--- /dev/null
+++ b/frontend/src/routes/register/+page.svelte
@@ -0,0 +1,71 @@
+<script lang="ts">
+	import { goto } from '$app/navigation';
+	import { post } from '$lib/api';
+	import type { User } from '$lib/types';
+
+	let name = $state('');
+	let email = $state('');
+	let password = $state('');
+	let error = $state('');
+	let loading = $state(false);
+
+	async function handleSubmit(e: SubmitEvent) {
+		e.preventDefault();
+		error = '';
+		loading = true;
+		try {
+			const res = await post<User>('/api/users/register', { name, email, password });
+			if (!res.success) {
+				error = res.error ?? 'Registration failed';
+				return;
+			}
+			goto('/login');
+		} catch {
+			error = 'Registration failed';
+		} finally {
+			loading = false;
+		}
+	}
+</script>
+
+<div class="container">
+	<h1>Create account</h1>
+	<form onsubmit={handleSubmit}>
+		<label>
+			Name
+			<input type="text" bind:value={name} required />
+		</label>
+		<label>
+			Email
+			<input type="email" bind:value={email} required />
+		</label>
+		<label>
+			Password
+			<input type="password" bind:value={password} required minlength="8" />
+		</label>
+		{#if error}<p class="error">{error}</p>{/if}
+		<button type="submit" disabled={loading}>
+			{loading ? 'Creating...' : 'Create account'}
+		</button>
+	</form>
+	<p><a href="/login">Already have an account?</a></p>
+</div>
+
+<style>
+	.container {
+		max-width: 360px;
+		margin: 4rem auto;
+	}
+	h1 {
+		margin-bottom: 1.5rem;
+	}
+	form {
+		display: flex;
+		flex-direction: column;
+		gap: 1rem;
+	}
+	p {
+		margin-top: 1rem;
+		font-size: 0.875rem;
+	}
+</style>
diff --git a/frontend/static/robots.txt b/frontend/static/robots.txt
new file mode 100644
index 0000000..b6dd667
--- /dev/null
+++ b/frontend/static/robots.txt
@@ -0,0 +1,3 @@
+# allow crawling everything by default
+User-agent: *
+Disallow:
diff --git a/frontend/svelte.config.js b/frontend/svelte.config.js
new file mode 100644
index 0000000..831e44a
--- /dev/null
+++ b/frontend/svelte.config.js
@@ -0,0 +1,18 @@
+import adapter from '@sveltejs/adapter-static';
+
+/** @type {import('@sveltejs/kit').Config} */
+const config = {
+	compilerOptions: {
+		runes: ({ filename }) => (filename.split(/[/\\]/).includes('node_modules') ? undefined : true)
+	},
+	kit: {
+		adapter: adapter({
+			pages: '../internal/static/build',
+			assets: '../internal/static/build',
+			fallback: 'index.html',
+			precompress: false,
+		}),
+	}
+};
+
+export default config;
diff --git a/frontend/tsconfig.json b/frontend/tsconfig.json
new file mode 100644
index 0000000..2c2ed3c
--- /dev/null
+++ b/frontend/tsconfig.json
@@ -0,0 +1,20 @@
+{
+	"extends": "./.svelte-kit/tsconfig.json",
+	"compilerOptions": {
+		"rewriteRelativeImportExtensions": true,
+		"allowJs": true,
+		"checkJs": true,
+		"esModuleInterop": true,
+		"forceConsistentCasingInFileNames": true,
+		"resolveJsonModule": true,
+		"skipLibCheck": true,
+		"sourceMap": true,
+		"strict": true,
+		"moduleResolution": "bundler"
+	}
+	// Path aliases are handled by https://svelte.dev/docs/kit/configuration#alias
+	// except $lib which is handled by https://svelte.dev/docs/kit/configuration#files
+	//
+	// To make changes to top-level options such as include and exclude, we recommend extending
+	// the generated config; see https://svelte.dev/docs/kit/configuration#typescript
+}
diff --git a/frontend/vite.config.ts b/frontend/vite.config.ts
new file mode 100644
index 0000000..f9b292a
--- /dev/null
+++ b/frontend/vite.config.ts
@@ -0,0 +1,11 @@
+import { sveltekit } from '@sveltejs/kit/vite';
+import { defineConfig } from 'vite';
+
+export default defineConfig({
+	plugins: [sveltekit()],
+	server: {
+		proxy: {
+			'/api': 'http://localhost:41605',
+		},
+	},
+});
diff --git a/internal/handlers/auth_handler.go b/internal/handlers/auth_handler.go
index cea3cfc..74913ae 100644
--- a/internal/handlers/auth_handler.go
+++ b/internal/handlers/auth_handler.go
@@ -91,6 +91,6 @@ func (h *AuthHandler) Logout(w http.ResponseWriter, r *http.Request) {
 }
 
 func (h *AuthHandler) RegisterRoutes(mux *http.ServeMux, protect func(http.HandlerFunc) http.HandlerFunc) {
-	mux.HandleFunc("POST /auth/login", h.Login)
-	mux.HandleFunc("POST /auth/logout", protect(h.Logout))
+	mux.HandleFunc("POST /api/auth/login", h.Login)
+	mux.HandleFunc("POST /api/auth/logout", protect(h.Logout))
 }
diff --git a/internal/handlers/expense_handler.go b/internal/handlers/expense_handler.go
index de3ac0a..c7c870e 100644
--- a/internal/handlers/expense_handler.go
+++ b/internal/handlers/expense_handler.go
@@ -173,9 +173,9 @@ func (h *ExpenseHandler) Delete(w http.ResponseWriter, r *http.Request) {
 }
 
 func (h *ExpenseHandler) RegisterRoutes(mux *http.ServeMux, protect func(http.HandlerFunc) http.HandlerFunc) {
-	mux.HandleFunc("POST /expenses", protect(h.Create))
-	mux.HandleFunc("GET /expenses/{id}", protect(h.GetByID))
-	mux.HandleFunc("GET /expenses", protect(h.ListByUser))
-	mux.HandleFunc("PUT /expenses/{id}", protect(h.Update))
-	mux.HandleFunc("DELETE /expenses/{id}", protect(h.Delete))
+	mux.HandleFunc("POST /api/expenses", protect(h.Create))
+	mux.HandleFunc("GET /api/expenses/{id}", protect(h.GetByID))
+	mux.HandleFunc("GET /api/expenses", protect(h.ListByUser))
+	mux.HandleFunc("PUT /api/expenses/{id}", protect(h.Update))
+	mux.HandleFunc("DELETE /api/expenses/{id}", protect(h.Delete))
 }
diff --git a/internal/handlers/spa_handler.go b/internal/handlers/spa_handler.go
new file mode 100644
index 0000000..1f7284e
--- /dev/null
+++ b/internal/handlers/spa_handler.go
@@ -0,0 +1,41 @@
+package handlers
+
+import (
+	"io/fs"
+	"net/http"
+	"os"
+)
+
+type SPAHandler struct {
+	fileServer http.Handler
+	staticFS   http.FileSystem
+}
+
+func NewSPAHandler(fsys fs.FS) (*SPAHandler, error) {
+	sub, err := fs.Sub(fsys, "build")
+	if err != nil {
+		return nil, err
+	}
+	hfs := http.FS(sub)
+	return &SPAHandler{
+		fileServer: http.FileServer(hfs),
+		staticFS:   hfs,
+	}, nil
+}
+
+func (h *SPAHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	f, err := h.staticFS.Open(r.URL.Path)
+	if err == nil {
+		f.Close()
+		h.fileServer.ServeHTTP(w, r)
+		return
+	}
+	if !os.IsNotExist(err) {
+		http.Error(w, "internal server error", http.StatusInternalServerError)
+		return
+	}
+	// SPA fallback: serve index.html for client-side routing
+	r2 := r.Clone(r.Context())
+	r2.URL.Path = "/"
+	h.fileServer.ServeHTTP(w, r2)
+}
diff --git a/internal/handlers/user_handler.go b/internal/handlers/user_handler.go
index 690e3a2..300188f 100644
--- a/internal/handlers/user_handler.go
+++ b/internal/handlers/user_handler.go
@@ -136,7 +136,7 @@ func (h *UserHandler) List(w http.ResponseWriter, r *http.Request) {
 }
 
 func (h *UserHandler) RegisterRoutes(mux *http.ServeMux, protect func(http.HandlerFunc) http.HandlerFunc) {
-	mux.HandleFunc("POST /users/register", h.Register)
-	mux.HandleFunc("GET /users/{id}", protect(h.GetByID))
-	mux.HandleFunc("GET /users", protect(h.List))
+	mux.HandleFunc("POST /api/users/register", h.Register)
+	mux.HandleFunc("GET /api/users/{id}", protect(h.GetByID))
+	mux.HandleFunc("GET /api/users", protect(h.List))
 }
diff --git a/internal/static/static.go b/internal/static/static.go
new file mode 100644
index 0000000..ee17f96
--- /dev/null
+++ b/internal/static/static.go
@@ -0,0 +1,6 @@
+package static
+
+import "embed"
+
+//go:embed all:build
+var FS embed.FS
diff --git a/main.go b/main.go
index cbcde64..c506e26 100644
--- a/main.go
+++ b/main.go
@@ -11,6 +11,7 @@ import (
 	"github.com/nirupam52/expenseTrack/internal/handlers"
 	"github.com/nirupam52/expenseTrack/internal/repository"
 	"github.com/nirupam52/expenseTrack/internal/response"
+	"github.com/nirupam52/expenseTrack/internal/static"
 )
 
 func main() {
@@ -40,7 +41,7 @@ func main() {
 
 	mux := http.NewServeMux()
 
-	mux.HandleFunc("GET /ping", func(w http.ResponseWriter, r *http.Request) {
+	mux.HandleFunc("GET /api/ping", func(w http.ResponseWriter, r *http.Request) {
 		if err := response.WriteSuccess(w, http.StatusOK, "pong"); err != nil {
 			log.Printf("failed to write response: %v", err)
 		}
@@ -50,6 +51,12 @@ func main() {
 	userHandler.RegisterRoutes(mux, protect)
 	expenseHandler.RegisterRoutes(mux, protect)
 
+	spaHandler, err := handlers.NewSPAHandler(static.FS)
+	if err != nil {
+		log.Fatalf("could not create spa handler: %v", err)
+	}
+	mux.Handle("/", spaHandler)
+
 	addr := fmt.Sprintf(":%s", appConfig.Port)
 	log.Printf("server listening on %s", addr)
 	log.Fatal(http.ListenAndServe(addr, mux))
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..d8bed53
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,6 @@
+{
+  "name": "expenseTrack",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {}
+}
diff --git a/scripts/build.go b/scripts/build.go
new file mode 100644
index 0000000..6c00e3e
--- /dev/null
+++ b/scripts/build.go
@@ -0,0 +1,40 @@
+//go:build ignore
+
+package main
+
+import (
+	"log"
+	"os"
+	"os/exec"
+	"runtime"
+)
+
+func main() {
+	vite := exec.Command(npm(), "run", "build")
+	vite.Dir = "frontend"
+	vite.Stdout = os.Stdout
+	vite.Stderr = os.Stderr
+	if err := vite.Run(); err != nil {
+		log.Fatalf("frontend build failed: %v", err)
+	}
+
+	bin := "expensetrack"
+	if runtime.GOOS == "windows" {
+		bin = "expensetrack.exe"
+	}
+	build := exec.Command("go", "build", "-o", bin, ".")
+	build.Stdout = os.Stdout
+	build.Stderr = os.Stderr
+	if err := build.Run(); err != nil {
+		log.Fatalf("go build failed: %v", err)
+	}
+
+	log.Printf("built: %s", bin)
+}
+
+func npm() string {
+	if runtime.GOOS == "windows" {
+		return "npm.cmd"
+	}
+	return "npm"
+}
diff --git a/scripts/dev.go b/scripts/dev.go
index a90753f..87bc57b 100644
--- a/scripts/dev.go
+++ b/scripts/dev.go
@@ -3,21 +3,46 @@
 package main
 
 import (
+	"log"
 	"os"
 	"os/exec"
+	"os/signal"
 	"runtime"
 )
 
 func main() {
-	// Pick the right Air config for the current OS
+	vite := exec.Command(npm(), "run", "dev")
+	vite.Dir = "frontend"
+	vite.Stdout = os.Stdout
+	vite.Stderr = os.Stderr
+	if err := vite.Start(); err != nil {
+		log.Fatalf("failed to start vite: %v", err)
+	}
+
 	config := ".air.unix.toml"
 	if runtime.GOOS == "windows" {
 		config = ".air.toml"
 	}
+	air := exec.Command("air", "-c", config)
+	air.Stdout = os.Stdout
+	air.Stderr = os.Stderr
+	air.Stdin = os.Stdin
+	if err := air.Start(); err != nil {
+		vite.Process.Kill()
+		log.Fatalf("failed to start air (is it installed? go install github.com/air-verse/air@latest): %v", err)
+	}
+
+	sig := make(chan os.Signal, 1)
+	signal.Notify(sig, os.Interrupt)
+	<-sig
 
-	cmd := exec.Command("air", "-c", config)
-	cmd.Stdout = os.Stdout
-	cmd.Stderr = os.Stderr
-	cmd.Stdin = os.Stdin
-	cmd.Run()
+	vite.Process.Kill()
+	air.Process.Kill()
+}
+
+func npm() string {
+	if runtime.GOOS == "windows" {
+		return "npm.cmd"
+	}
+	return "npm"
 }