// projects
Selected work
Each project documents its architecture, technology decisions, reliability design, and observability — not just what it does, but how it is operated.
- 01Blogify AI5 agents
Multi-agent content pipeline with sandboxed secrets and cost telemetry.
Python · FastAPI · Google ADK · Postgres · Grafana · tmpfs
- 02Distributed System Basics18.86s p95 terminal
Lease-fenced async job runner with Postgres as truth, Redis as transport, and a reaper for stale work.
Python · FastAPI · PostgreSQL · Redis · AWS EC2 · Prometheus
- 03Pinpoint PDF3-stage retrieval
Layout-aware RAG with multi-query, RRF, and a cross-encoder rerank stage.
Python · FastAPI · Pinecone · PyMuPDF · Cross-encoder
- 04E-Library REST API< 50ms read p95
RBAC-protected Express/TS API with Redis cache-aside and Prometheus SLIs.
TypeScript · Express · Postgres · Redis · Prometheus · EC2
- 05Blogify Edge~2–3× faster sign-in
Hono on Workers with OAuth2 PKCE and Web Crypto-signed sessions.
TypeScript · Hono · Cloudflare Workers · Web Crypto · OAuth2 PKCE