Full Stack Developer Needed

Senior Full-Stack Fintech Developer – React/Next.js, Node.js, Payments APIs momo2momo is a fintech platform being developed to support money movement across mobile money, banking, and payment ecosystems. We are looking for an experienced Full-Stack Fintech Developer to help take the product from its current MVP stage through integration, testing, security hardening, and production deployment. The ideal candidate should have strong experience with React/Next.js or React Native, Node.js, REST APIs, PostgreSQL/MySQL, AWS/GCP, Git/GitHub, authentication, and application/API security. Fintech experience is important. You should be comfortable working with payment gateways, mobile money, banking APIs, KYC/AML services, webhooks, transaction flows, reconciliation, retries, idempotency, and third-party integrations. Responsibilities Review the existing codebase and identify technical gaps. Complete frontend and backend development. Build and integrate secure REST APIs. Integrate payment, mobile money, banking, KYC/AML, and third-party APIs. Implement webhooks, transaction status handling, retries, and error management. Improve database design, authentication, security, testing, logging, and monitoring. Support AWS/GCP deployment and CI/CD. Help move momo2momo from MVP to a secure, scalable, production-ready platform. Required Skills React / Next.js / React Native Node.js REST APIs PostgreSQL / MySQL AWS or GCP Git/GitHub Payment/API integrations Authentication and API security Testing, monitoring, and scalable backend architecture Preferred Experience Mobile money, fintech, digital wallets, remittance, payment gateways, banking APIs, KYC/AML, or cross-border payment systems. When Applying Please briefly answer: What fintech/payment systems have you worked on? Which payment, mobile-money, or banking APIs have you integrated? Have you implemented webhooks and transaction reconciliation? How do you handle payment idempotency and API credential security? Can you review and continue development of an existing codebase? Please share relevant GitHub, portfolio, or project examples. Engagement: Remote contract, with potential for longer-term work based on performance.