Senior Full Stack Engineer (React/Node.js) for Restaurant Fintech SaaS – Payments, Wallets & M-Pesa

About Us We are building MezaFlow, a restaurant technology platform in Kenya that enables customers to: Scan QR codes Order food digitally Pay using M-Pesa Track order status Our vision is to evolve MezaFlow into a restaurant payments and financial operating system. Current Features QR ordering Customer ordering flow Waiter dashboard Admin dashboard Restaurant onboarding IntaSend payments eTIMS readiness Next Features IntaSend Wallet as a Service Restaurant wallets Commission deductions Daily settlements Multi-branch management Revenue analytics Financial reporting Technical Stack Frontend React.js Next.js TypeScript Tailwind Backend Node.js NestJS or Express.js PostgreSQL Redis Infrastructure Docker Linux Nginx CI/CD Requirements You must have built at least one of the following: ✅ Payment platforms ✅ Wallet systems ✅ Marketplace platforms ✅ Multi-tenant SaaS products ✅ Restaurant POS systems ✅ Fintech applications Deliverables Review and improve architecture Implement IntaSend payments Implement Wallet as a Service Build transaction ledger Build settlements engine Production deployment Documentation and handover IMPORTANT: This project involves handling customer payments and financial data. We are looking for a senior engineer who thinks about scalability, security, and system design not just coding screens.