Principal Engineer — Fintech & Agentic AI · Ho Chi Minh City, Vietnam 🇻🇳
I turn fuzzy product ideas into resilient distributed systems. Over 6+ years I've grown from intern to Principal Engineer at a YC-backed fintech, shipping a multi-bank savings & deposit platform end-to-end — and more recently, building multi-agent AI infrastructure that makes AI-generated code trustworthy in production.
- Fintech platforms — multi-bank savings & Certificate of Deposit products, Temporal-orchestrated financial workflows, interest calculation & reconciliation pipelines, partitioned PostgreSQL at scale, streaming regulatory report exports
- Agentic AI infrastructure — founded an internal multi-agent platform: per-user sandboxed AI assistants across Slack / Discord / Telegram / WhatsApp with Docker-in-Docker isolation, RBAC dashboards, horizontal shard scaling, and E2E harnesses with mock LLM services
- Engineering leverage — hexagonal architecture (ports & adapters), NestJS microservices in NX monorepos, pyramid testing, spec-driven development with AI agents
Contributor of:
- nestjs/nest
- nestjs/swagger
- nestjs/cache-manager
- nestjs/docs.nestjs.com
- DefinitelyTyped
- openclaw
- claude-mem
- automaton
- oh-my-openagent
- multica
- 🏦 Scaled a partner banking SDK from a single integration into a true multi-bank platform serving a nationwide user base
- ⚡ Cut API latency dramatically with Redis caching models on a high-traffic GraphQL API
- 🧪 Replaced most manual QC with a pyramid testing model and a deep automated test suite
- 🚀 Hardened CI/CD pipelines for faster, safer deploys
- 🤖 Took an internal AI platform from zero to production: multi-channel assistants, proactive outreach engine, soak-tested horizontal scaling
Core: TypeScript · Node.js · NestJS · PostgreSQL · Temporal · Redis · GraphQL / gRPC Cloud & Infra: AWS (Lambda, SQS, SNS, S3) · Docker · GitHub Actions · Serverless · NX monorepos AI engineering: Claude Code · multi-agent orchestration · prompt engineering · evaluation & soak harnesses · spec-driven development Also: Python · Kafka · MongoDB · React/Preact