Amber: kanban board
A multi-user kanban board: sign-up, boards, columns, drag-and-drop cards. Go + SQLite without CGO, the front end is embedded in the binary.
- tests
- 7
- routes
- 18
14 projects
Backends
Services with an API, a database and tests: mostly Go, with some in Python and TypeScript. A language filter sits inside the section.
- 386 tests
- 227 routes
- 24,370 lines of Go
Backends: Projects
Short: link shortener
Link shortening with aliases and expiry, click statistics by day, browser and device, a token-protected dashboard. IP addresses are not stored.
- tests
- 12
- routes
- 11
Appointment booking
Online booking: free slots computed from service duration and working hours, double-booking protection, an admin panel. A fictional studio, demo.
- tests
- 12
- routes
- 18
Pulse: uptime monitor
An uptime monitor: scheduled HTTP and TCP checks, uptime, p50/p95, an incident detector, a live SSE dashboard and a public status page. Go + SQLite without CGO.
- tests
- 18
- routes
- 15
Conveyor: job queue
A background job queue: priorities, delayed and cron jobs, retries with backoff and jitter, dead-letter, idempotency keys, leases with fencing, Prometheus metrics.
- tests
- 25
- routes
- 19
Rooms: realtime chat and board
Realtime rooms: chat with SQLite history, an online list, a typing indicator, a shared board with strokes and cursors, anonymous nicknames. WebSocket (RFC 6455) written on the stdlib.
- tests
- 48
- routes
- 7
Sluice: API gateway
An API gateway on the pure stdlib: host/prefix routes from a JSON config with hot reload that keeps connections alive, round-robin and least-conn balancing, health checks, a per-node circuit breaker, retries of idempotent requests, rate limiting, hashed API keys, Prometheus metrics and a live SSE dashboard.
- tests
- 48
- routes
- 11
Card Index: notes with search
A Markdown notes base on Go and SQLite: [[wiki]] links with backlinks and a link graph, FTS5 full-text search (bm25, highlighting, simplified Russian morphology), version history with its own diff, autosave with conflict resolution, .md export and import.
- tests
- 32
- routes
- 19
Raft KV: a key-value store on Raft
A from-scratch teaching implementation of Raft on the pure stdlib: leader election, log replication, quorum commit, a log and term/vote on disk with fsync, snapshots with compaction, linearizable reads (read-index) and follower-to-leader redirects. It is tested with a deterministic network and time simulator that checks linearizability; the dashboard can kill the leader and cut the network (demo).
- tests
- 27
- routes
- 13
Keyring: an authentication service
An authentication and authorization service in Go: EdDSA JWTs with key rotation and JWKS, refresh tokens with rotation and theft detection, TOTP 2FA (RFC 6238) with backup codes, RBAC, lockout on brute force, password reset by a one-time token, an audit log, a device list, openapi.yaml. Not independently audited, not a production IdP.
- tests
- 50
- routes
- 35
Ledger: personal finance tracker
Personal finance tracking: accounts in different currencies with manual exchange rates, income, expenses and transfers, budgets, payments on a cron-like schedule, CSV import with a preview, reports. Money is stored only in integer minor units, users' data is isolated, and the charts are drawn in SVG with no library. Go + SQLite with a Nuxt 4 front end.
- tests
- 30
- routes
- 45
Pixel Wall: a shared canvas
A shared 256x256 canvas in the spirit of r/place: 16 colors, a cooldown per session and IP, an own WebSocket layer on the stdlib (RFC 6455) with a binary protocol (4 bits per pixel), a snapshot plus deltas, a snapshot with a journal and recovery, a timelapse, zoom and pan, a minimap, PNG export and admin tools. A side project.
- tests
- 77
- routes
- 16
catalog-api: a catalog API with search
A product catalog API on Python 3.12 and FastAPI: SQLite with FTS5 full-text search (bm25 ranking), facets by category, price, availability, tags and attributes, cursor pagination, ETag, CSV import and export, price history, API keys with roles and an audit log. The storefront and the admin panel are served by the app itself, with no framework. A side project.
Konvert: notes encrypted in the browser
A one-time note service on TypeScript, Cloudflare Workers and D1: the text is encrypted in the browser (AES-256-GCM), the key lives only in the URL fragment and never reaches the server. A note has a lifetime, an optional password and burns after the first read. A side project.