Phatdanai Shinpanjapol

URL shortener with click tracking. Go library plus a TypeScript port that powers the live /r/* links on this site.

Sliding-window rate limiter for Go. One interface, multiple backends (memory + Redis), plus net/http middleware that just works.

A small webhook dispatcher with HMAC-signed delivery, durable retry, and a Postgres queue. Go library plus a synchronous TS demo on this site.

Drop-into-anything email/password auth library for Go — argon2id passwords, opaque session tokens, pluggable Store, RBAC middleware.

Backend-agnostic transactional email library for Go. One Sender interface, three backends (memory / SMTP / Brevo), zero external dependencies.

DRF-style filter / search / sort / paginate helper for Go list endpoints. One Spec, swappable backends (slice, GORM), allowlist by construction.

Storage-agnostic object storage library for Go — one interface, multiple backends (memory, S3-compatible).

Recruitment platform that combines live coding assessments with video recording in a single workflow.

Community platform serving 20,000+ KMUTT students — campus-wide services in a single integrated system.

Email-based one-time-password flow — request, verify, expire. Built as a portfolio demo, designed so the patterns transfer into real auth systems.

One-screen full-stack demo. Real signup + opaque sessions + per-user task dashboard with filter/search/sort/CRUD. Composes the PS-safe research libraries inside this portfolio's Next.js runtime against Neon.