Claudiu Stefan

Co-led the development and launch of a delivery marketplace in Spain, enabling four React Native/Expo apps tailored for customers, drivers, kitchens, and operations. Engineered Next.js/React apps and Node.js/Hono APIs for order management, restaurant workflows, payment processing, and real-time tracking, using PostgreSQL/PostGIS, Redis, and Stripe. Implemented a Python/FastAPI and gRPC dispatch service for order assignments, multi-stop route optimization, preparation time predictions, and estimated arrival times. Enabled driver clock-out functionality independent of precise GPS while maintaining strict location validation for clock-in. Managed automated testing, CI/CD pipelines, and production infrastructure hosted on Hetzner using Docker, Coolify, and GitHub Actions.

Developed and launched a subscription-based wellness application with a paying user base using React Native/Expo and Supabase for user check-ins, health data integration, and subscription billing. Integrated Anthropic APIs via proxy and edge functions to support meal analysis, generate personalized user insights, and run push notification campaigns. Owned end-to-end product delivery across mobile apps, backend services, web admin portal, content creation tools, analytics dashboards, and app store releases.

Directed Building Management System (BMS) installation for a major Microsoft data centre expansion, overseeing HVAC, power monitoring, and environmental control systems. Completed control wiring and point-to-point testing in coordination with commissioning teams, ensuring the system was ready for handover.