what i build
services- architecture
System architecture
End-to-end design from data model to deployment. Postgres, queues, caching, multi-tenant boundaries, scalability budgets.
- api
REST & GraphQL APIs
Production-grade backends. TypeScript + Node + Postgres. Auth, rate limits, observability, OpenAPI.
- admin
Admin & dashboards
Internal tools and SaaS dashboards. React 19, Next.js, Tailwind, Tanstack Table, RBAC, audit logs.
- mobile
Mobile apps
Capacitor + Preact/React. One codebase to web + iOS + Android. NFC, push, payments, deep links.
- devops
DevOps & cloud
Hetzner / Cloudflare / R2 / Postgres tuning / PM2 / nginx. No Kubernetes-for-the-sake-of-it.
- ai
AI integration
LLM agents, streaming chat, retrieval, function-calling. OpenAI / Anthropic / DeepSeek with cost caps and abuse protection — production, not demos.