SinnerCode

Location: Vietnam (UTC+7) Remote: Yes, remote only. Contract or part-time; can overlap with EU mornings or US evenings Willing to relocate: No Technologies: TypeScript, React, Next.js, Node.js (Fastify), Python (FastAPI, aiogram), PostgreSQL, Redis, Docker, GitHub Actions; webhooks and API integrations, Telegram bots and Mini Apps, LLM features (RAG with citations, Claude/OpenAI APIs, pgvector) Résumé/CV: https://sinnercode228.github.io/portfolio/ GitHub: https://github.com/sinnercode228 Email: sinnercode228 [at] gmail [dot] com

Full-stack developer doing commercial web work since 2019. Started with online stores and service sites, then internal tools for sales and service teams (a lead-handling CRM, a document approval portal, supplier catalog sync), then subscription and payment products, including a Telegram sales platform with automatic delivery. I usually own the whole thing: schema, API, UI, deploy, support.

Client code is private, so my public repos are standalone projects with live demos: Relay, a webhook hub with a Redis lease queue and retries; DocMind, RAG where the source cards are on screen before the first answer token; Pulse, cookieless analytics with HyperLogLog rollups; FlowDesk, a CRM with rotating refresh tokens and a race-safe refresh.

Looking for contract work: integrations, internal tools, Telegram bots and Mini Apps, LLM features on top of an existing product, or taking over a codebase someone else started and getting it to production.