Backend engineer working mostly in TypeScript (Node.js) and Go. I design services around DDD, CQRS and event-driven patterns, and I like turning architecture rules into checks that run in CI instead of leaving them in a wiki.
📫 kyhsa93@naver.com · ✍️ kyhsa93.github.io (한국어)
| Project | What it shows |
|---|---|
| backend-service-playbook | One DDD backend design (Account / Card / Payment) implemented independently in 5 stacks: NestJS, Go, Spring Boot (Java, Kotlin), FastAPI. Each ships a compliance harness that scores layering, dependency direction and naming, plus a scaffolding generator. CI covers each stack, CodeQL, gitleaks, Trivy and docs-drift checks. |
| nestjs-rest-cqrs-example ⭐ 870+ | Layered DDD + CQRS reference in NestJS: aggregates, domain events, repository interfaces, MySQL, and an outbox publishing to SQS (LocalStack). |
| k8s-playbook | A catalog of Kubernetes deployment anti-patterns with an automated detection harness, checked against Argo CD / Flux / Kargo setups. |
| jipgye (site) | A daily data pipeline on GitHub Actions: collects Seoul apartment transactions and rates, computes rent-vs-jeonse and renewal costs, and refuses to publish a number when the sample is too small. Test suite in CI, published corrections as GitHub Releases. |
I write about backend architecture and the things that only break in production: aggregate design, testing pitfalls, benchmarking AI agents against architecture rules. → All posts
Languages TypeScript · Go · Java/Kotlin · Python Backend NestJS · Spring Boot · FastAPI · MySQL · TypeORM · AWS SQS Infra Docker · Kubernetes · GitHub Actions · Terraform
Microservice design with DDD · event-driven architecture · containers and orchestration · cloud native (AWS, GCP)
Side projects (a browser raid game, an ASCII FPS, a toddler-milestone PWA) are in side-projects.