Istvan A.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.

Enterprise full-stack architect with two decades delivering high-impact systems for the financial sector and beyond. My work powers real results: payments platforms processing millions in daily trades at Marex, B2B e-commerce handling €150k+ in orders daily, and analytics dashboards used by JP Morgan to visualize billions in global trade data. I specialize in React, Node.js, TypeScript, and AWS cloud architecture — and increasingly in AI/LLM integration that transforms how businesses operate. From greenfield builds to rescuing struggling projects, I bring architectural clarity and hands-on execution. I've built foundational tooling and CI pipelines adopted across Deutsche Bank, architected platforms from zero to production at Hostettler AG, and consistently deliver systems designed for scalability and longevity. Whether you need a fractional CTO, a technical lead, or a senior developer who understands the full picture — I solve complex problems and ship quality code.