Marvin.

Payserve Limited

• Build and maintain production services for invoicing, payment workflows, and resident operations using Go, Node.js, React, and React Native
• Design REST APIs and background workers with predictable contracts across teams
• Implement M-Pesa/Daraja, email, and SMS integrations for transaction workflows
• Improve service reliability through structured logging, queue-based processing, and async job handling
• Optimize MongoDB/PostgreSQL queries and indexes under growing production load

Belva Digital

• Built client-facing applications using Laravel, Go, and Python for campaign and business platforms: Pika na Power, ViuTravel, Co-op Bank, KPLC
• Designed relational database schemas in MySQL/PostgreSQL with attention to performance, normalization, and reporting
• Worked with cloud deployment contexts including AWS and Azure-hosted workflows
• Refactored backend modules to improve maintainability and reduce response-time bottlenecks

Deveint Limited

• Built backend services in Go for core business logic and API endpoints
• Delivered supporting Python services for integrations and workflow-specific backend tasks
• Integrated and maintained APIs consumed by Flutter, React, and Next.js applications
• Designed data models and query patterns to improve consistency and developer onboarding speed

Soft IQ Technologies Ltd

• Developed operational dashboards using React and FastAPI for logistics and internal reporting
• Implemented JWT-based authentication and admin features with role-aware dashboard behavior
• Configured Linux server workflows including SSH deployment and Nginx service configuration
• Assisted with integration connecting business processes to Microsoft Dynamics 365