Chapa Payment Gateway Platform Development

Chapa is a secure and scalable payment gateway platform developed to simplify digital transactions for businesses and developers across Africa. The platform enables seamless payment processing, transaction tracking, and financial reporting through an intuitive interface and powerful backend infrastructure.

Built using Flutter for the mobile experience, Go (Golang) for backend services, and Supabase for authentication and data management, Chapa was designed to deliver speed, reliability, and trust for both merchants and customers.

As a Full Stack Developer, I was responsible for building and integrating the end-to-end system—from mobile payment flows to backend transaction logic—ensuring compliance, fault tolerance, and performance optimization.

Chapa’s design philosophy emphasizes accessibility, real-time processing, and extensibility, making it suitable for small businesses and large enterprises alike.

Frontend: Flutter (Dart), Material Design Backend: Golang (Fiber / Gin Framework), REST APIs Database: Supabase (PostgreSQL) Infrastructure: Docker, Replit (for initial builds), Cloud-based deployment Integrations: Payment APIs, Webhooks, Analytics Services

Backend Architecture & API Development

Designed and implemented RESTful APIs in Golang to handle payments, refunds, and merchant onboarding.

Integrated with external payment processors and bank APIs for real-time transaction validation and reconciliation.

Applied concurrency patterns and caching to achieve low-latency performance under high transaction loads.

Authentication & Data Management

Integrated Supabase for secure authentication, role-based access, and database management.

Designed relational schemas to handle merchant profiles, transactions, wallets, and payout logs.

Ensured data consistency and integrity through well-defined validation and error-handling routines.

Flutter Mobile Application

Developed a cross-platform mobile app using Flutter to allow users to send and receive payments, view balances, and track transaction history.

Implemented real-time transaction status updates and push notifications for payment confirmations.

Ensured the app followed modern UX principles with a clean and responsive design.

Security & Compliance

Implemented strong encryption and tokenization practices to protect sensitive user and payment data.

Integrated audit logging and monitoring for transaction traceability and regulatory compliance.

Followed PCI-DSS and GDPR-aligned practices for user data and financial security.

Deployment & Monitoring

Containerized the backend using Docker for smooth deployment across environments.

Set up CI/CD pipelines to automate testing and version releases.

Integrated monitoring tools for real-time system health and transaction analytics.

Transaction Reliability: Achieved a 99.9% success rate in processing transactions during load testing.

Performance: Reduced average API response time to under 250ms using optimized Golang routines.

Scalability: Designed the system to handle thousands of concurrent transactions per second.

User Adoption: Early deployments increased merchant onboarding by 40% through a simplified signup flow.

Security: Delivered enterprise-grade data protection and compliance-ready architecture for fintech scalability.