Senior Fintech / Full-Stack Developer — Marketplace Monetization, Payments & Payouts

Project Overview We have an existing multi-module marketplace built with React.js, Node.js/NestJS, MongoDB, REST APIs, cloud infrastructure, authentication/admin systems and GitHub. We need an experienced... (Budget: ₹500000 - ₹1000000 INR, Jobs: Amazon Web Services, API Integration, FinTech, MongoDB, Next.js, Node.js, Payment Gateway Integration, Payment Processing, React.js, Software Architecture)