Marius Cristian B.Private profile: Upwork shows its earnings only to signed-in members, so we check it every few weeks, not daily. MRR here is a rough estimate (Upwork's six-month earnings ÷ months active). Last read Nov 5, 2026.

I'm a software developer with 5+ years of professional React experience and a Claude Certified Architect (Foundations, Anthropic) — I design and build production-grade AI-powered applications alongside classic web & mobile work. Currently building a large-scale testing platform in the automotive industry, I work across web and mobile (React & React Native) and I ship real products — including my own apps live in production. What I bring: • 5+ years of React in production teams (Agile, cross-functional) • React Native apps for Android & iOS • AI system design & integration — Claude Agent SDK, Claude API, MCP (Model Context Protocol), multi-agent orchestration, prompt engineering, and structured output for production-reliable AI features • Web3/blockchain frontends — wallet connection, dashboards, MVPs delivered for Web3 companies • Strong automated testing: Cypress (E2E), Jest, React Testing Library — reliable code, fewer regressions Recent work of my own: MediLens, a medication-tracking Android app with on-device OCR scanning, a 98,000+ medicine database in 6 languages, drug-interaction checks and offline reminders (iOS in progress); its promo site and a free browser-based interaction checker; and SmileVillage, a fast, responsive single-page site for a dental practice. I build these under my studio, SoftLight Apps. Available ~15–20 hours/week (evenings & weekends, EU timezone). I communicate clearly and finish what I start. If you want an experienced developer who ships — with or without AI in the stack — let's talk.