Projects

Each project below is written as problem, architecture, key decisions, failure handling, observability, result, and lessons learned — not a technology list.

RelayHub

Live

An event-integration platform: events are ingested, validated, transformed, and delivered to downstream targets with retry, dead-letter handling, replay, and metrics — the same behavior this site's Live Lab lets you trigger yourself.

Java
Spring Boot
Kafka
PostgreSQL

English Core Speaking

Live

A full-stack English speaking practice service: a NestJS backend and Vue 3 frontend, with OAuth-based sign-in and an external AI/LLM API integration for evaluating spoken responses.

NestJS
Vue 3
PostgreSQL
Prisma