I'm Andrii Tsiurupa, a backend and fullstack developer specializing in payment systems, fintech infrastructure, and API design. I build production-grade solutions end-to-end — from crypto payment flows and webhook services to operator dashboards — using TypeScript, NestJS, and Next.js. My stack includes PostgreSQL, Redis, MongoDB, Docker, and AI-augmented development workflows. Based in Lugano, Switzerland, I'm open to backend and fintech roles across Switzerland and the EU, with a strong preference for teams that care about robust architecture and reliable payments infrastructure.…I'm Andrii Tsiurupa, a backend and fullstack developer specializing in payment systems, fintech infrastructure, and API design. I build production-grade solutions end-to-end — from crypto payment flows and webhook services to operator dashboards — using TypeScript, NestJS, and Next.js. My stack includes PostgreSQL, Redis, MongoDB, Docker, and AI-augmented development workflows. Based in Lugano, Switzerland, I'm open to backend and fintech roles across Switzerland and the EU, with a strong preference for teams that care about robust architecture and reliable payments infrastructure.WWWW…