Senior Full-Stack Engineer (Node.js / React / React Native)

We're hiring an autonomous Senior Full-Stack Engineer to own development of robust web and mobile applications, from backend architecture to polished UIs. You'll build scalable Node.js (TypeScript) services and high-performance React.js / React Native frontends, manage iOS/Android deployment pipelines, and integrate third-party APIs and payment gateways. This is a senior role: 6+ years commercial experience, advanced Node.js/TypeScript (Express, NestJS), SQL/NoSQL design, microservices, production-proven React/React Native, a CS degree, and exceptional English. Remote within North or South America with full overlap to LA (Pacific) time. Hourly contract, 40-80 hrs/month with occasional full-time capacity. Nice-to-have: fintech/PCI, Web3/blockchain, and Bun/Biome/Hono. Recent grads or bootcamp-only portfolios won't be considered.