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William Watanabe - Lead Technical Advisor / Software Engineer in New York City, NY

William Watanabe

Mid-level Full-Stack Software Engineer specializing in authentication and SolidJS/TypeScript

SolidAuthCalifornia State University, Long BeachNew York City, NY3 Years ExperienceMid LevelWorks On-Site

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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.

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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)

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Experience

Lead Technical Advisor / Software EngineerOFFSZN · Jun 2025 – Aug 2025contract
Full Stack Software EngineerSolidAuth · May 2023 – Present

Education

California State University, Long Beachbachelor, International Business
Codesmithbootcamp, Computer Science / Advanced Software Engineering Residency

Skills

JavaScriptTypeScriptPostgreSQLSQLNode.jsReactReduxGitWebpackMongoDBNoSQLSQLiteDockerCI/CDAWS

Languages

EnglishJapanese

Publications

2 publications

DenoAuthenticationAuthorizationSolidJSSolidStart

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Connect with William

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Typically responds within 24 hours

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William WatanabeMid-level Full-Stack Software Engineer specializing in authentication and SolidJS/TypeScript