Selected Work

Backend Engineer & System Architect

Designed and built a production-style payment platform using Go, PostgreSQL, Redis, Docker Compose, and Next.js. The system supports order creation, payment charging, HMAC-secured callbacks, refunds, invoice generation, and transaction logs. Implemented idempotency protection, authorization, transactional outbox processing, retries, dead-letter queues, and background workers for reliable asynchronous workflows.

Backend Engineer & API Architect

Built an API gateway platform with a Next.js 15 Backend-for-Frontend layer in front of a Go gateway service and PostgreSQL. The BFF proxies requests server-side, applying auth, timeouts and envelope mapping, and never exposes JWTs to browser JavaScript. The Go gateway implements JWT authentication, rate limiting, API and store services, and forwarding to configured upstream APIs, shipped with Kubernetes manifests.

Go Backend Engineer & Systems Developer

Developed a lightweight local LLM gateway for coding agents using Go. The gateway provides a unified interface for multiple providers, automatic failover, model-list refresh, response caching, token compression, and per-agent token and cost tracking. Designed as a low-memory static binary with no external runtime dependencies, improving reliability and visibility for local AI-assisted development workflows.

Backend Engineer & Quantitative Software Developer

Built a financial data platform using Python and FastAPI for Indonesian stock market analysis. The platform includes live quotes, multi-ticker screening, technical indicators, bandarmology validation, FIFO portfolio tracking, market-regime filtering, historical backtesting, and AI-generated market summaries. Designed data-processing workflows and API endpoints for market analysis, portfolio calculations, and reproducible trading research.

Python Developer & Quantitative Research Engineer

Created a Python command-line stock screening tool for Indonesian and IHSG markets. The application detects Stage 2 trends, volatility contraction patterns, pullbacks, breakouts, and reversals. It also includes technical indicators, institutional-flow analysis, market-regime filters, multiple backtesting strategies, and walk-forward out-of-sample evaluation for more disciplined and reproducible analysis.

Full-Stack Engineer & Application Architect

Built a local-first notes and Kanban application focused on privacy, offline use, and low resource consumption. The application provides note management, task organization, and board-based workflows without requiring a cloud account. Implemented local persistence, a responsive interface, and desktop packaging with Tauri for users who want full control of their data.