Marvin.

Payserve Limited

• Build a cloud-based property management platform letting landlords and property managers run residential and commercial portfolios from one system
• Design REST APIs for authentication, payment processing, inventory management, and asynchronous background jobs
• Implement enterprise authentication with RBAC, MFA, audit logging, and session security
• Improve data access patterns across MongoDB and PostgreSQL to absorb rising transaction volumes
• Deliver client solutions across Laravel, .NET, JavaScript, and Node.js environments, integrating third-party payment providers and business services

Zetech University

• Built integrations synchronizing data between Moodle, the Student Management System, Microsoft Dynamics 365 Business Central, and internal university systems
• Built an automated suspension engine synchronizing finance and academic status across systems
• Corrected over 38,000 inconsistent usernames in production without downtime
• Automated synchronization processes that previously required manual intervention

Podium Streak

• Developed a cloud-based POS platform for salons, barbershops, supermarkets, restaurants, pharmacies, and other retail businesses covering sales, inventory, payments, and financial management
• Built backend services and scalable REST APIs using ASP.NET Core (C#)
• Integrated QuickBooks, KRA eTIMS, and Business Central for accounting, tax compliance, and ERP synchronization
• Implemented local and international payment integrations, including reusable multi-tenant M-Pesa payment services
• Designed contract-first APIs enabling parallel frontend and backend development
• Implemented background jobs for invoice synchronization, payment callbacks, notifications, and image processing

Belva Digital

• Developed Laravel-based business systems and administration portals
• Built REST APIs consumed by web applications
• Designed relational database schemas using MySQL and PostgreSQL
• Delivered client solutions across Laravel, Go, and Node.js environments
• Participated in deployments, production support, and feature delivery

Deveint Limited

• Built backend services using Go (Gin) for business applications consumed by Flutter, React, and Next.js clients
• Designed scalable backend architectures and optimized SQL database performance
• Developed workflow automation tools supporting internal business operations
• Supported production deployments and ongoing maintenance