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Chi Yeung To
Senior Full-Stack Engineer specializing in AI platforms and cloud-native web/mobile apps
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About
Founding/solo engineer who rebuilt an early-stage product from the ground up: Ask NETA, an AI assistant for electricians to answer complex electrical code questions. Delivered a full-stack TypeScript system (React web + React Native iOS/Android, Express API, Postgres on AWS) with CI/CD, observability, and a Vertex AI RAG pipeline, reaching 3,000 MAUs in the first month; also built a real-time distributed scoring system handling unreliable hardware data with sequencing and retries.
Experience
Education
Key Strengths
- Solo engineer who shipped an AI assistant (web + iOS + Android) end-to-end (frontend, backend, infra, deployment)
- Scaled product from 0 to 3,000 monthly active users in the first month (organic growth)
- Strong DevOps/CI/CD ownership: Docker + GitHub Actions deploying to Coolify with rapid same-day fixes
- Quality-focused development using BDD and automated tests to prevent regressions
- Designed robust migration safety checks (migration tracking/verification) to keep backend and Postgres schema in sync
- Built RAG-based search using Google Vertex AI grounded in official electrical codes
- Implemented production observability and alerting (Sentry + PostHog + Discord notifications)
- Designed reliable ingestion/reconciliation for flaky hardware data using sequence IDs and exponential backoff retries (real-time bowling scoring system)
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