Backend Engineer · Payments & Fintech · LLM Systems
I've built payment systems in production since 2021: payment-gateway and Thai bank integrations, Stripe and PayPal payments, payouts and refunds. I work mainly in TypeScript, NestJS and PostgreSQL in Bangkok.
I also build LLM features where the model's output is checked in code before anyone relies on it (receipt parsing in Harn, comment triage in The Kept Journal). MSc Data Science, Germany.
A multi-app rental platform that carries a tenancy from booking and payment through a bilingual contract, handover and payout to the landlord.
Transactional outbox with SKIP LOCKED dispatch, and CI rules that keep payment and payout code behind its owning module.
Upload a receipt, share one link, and everyone ticks what they ate and pays by cash or bank transfer with a slip.
Optimistic concurrency on D1, and receipt parsing whose model output is checked against the totals in code.
A travel journal site with a built-in admin and CMS, running on Cloudflare Workers with a Supabase Postgres database.
Encrypted credential store (AES-256-GCM), idempotent publishing, and a script check that fails if any Postgres table lacks RLS.
Case study: The Kept JournalLive site for The Kept Journal: thekeptjournal.net
A small personal project from early 2026 exploring BullMQ job queues. Built as a demo, not a production system.
A BullMQ job-queue service in NestJS with a REST control API (enqueue, retry, pause, resume, remove) and a live Next.js dashboard over WebSockets. A demo: the workers and the dashboard's throughput figures are simulated; job progress and completion events are real WebSocket pushes.
Open to backend and fintech roles. The fastest way to reach me is email.