William Watanabe

About

Mid-level full-stack engineer (Los Angeles) who built and shipped an end-to-end authentication system for SolidAuth, an open-source SolidStart ecosystem library published to NPM with 1000+ downloads. Experienced designing React/TypeScript + Node + Postgres architectures, operating lightweight production systems on AWS (EC2/S3/RDS/IAM/CloudWatch), and building resilient third-party ingestion/integration flows with idempotency, retries, queues, and backfills; also worked in an early-stage NIL startup (OFFSZN) shipping core onboarding/profile features amid changing requirements.

Experience

Education

Key Strengths

• Owned and shipped end-to-end auth system (backend, frontend components, packaging/deployment) for open-source SolidAuth
• Demonstrated adoption metric: 1000+ NPM downloads
• Full-stack architecture design with clear separation of concerns (React/TS + Node + Postgres)
• Performance-minded backend/data design (indexes, efficient queries, pagination, cache-friendly APIs)
• Production AWS operations with environment isolation and CloudWatch-based logging/metrics/alarms
• High-ownership execution in ambiguous early-stage startup environment (OFFSZN) shipping onboarding/profile quickly
• Improved maintainability via modular frontend hooks/utilities and backend service layer abstractions
• Reliable integration/pipeline design for flaky external APIs (idempotency, retries/backoff, queues, replayability, backfills, reconciliation, alerting)