Designed, developed, and maintained full-stack web applications for international clients, delivering feature enhancements and production bug fixes within established codebases. Built and optimized RESTful API endpoints using C# and ASP.NET MVC. Wrote and optimized T-SQL queries against SQL Server. Collaborated with distributed teams using Git, participated in code reviews, and documented technical processes. Investigated and resolved production issues through structured debugging.

Designed and executed comprehensive test cases, regression tests, and end-to-end evaluation scenarios for web applications (C#, ASP.NET MVC, Entity Framework, SQL Server). Tested RESTful APIs using Postman. Investigated reported defects by reproducing issues and analyzing application behavior and database records. Maintained rigorous test documentation and defect reports.

Supported, maintained and enhanced a live Human Resource Management System (C#, ASP.NET MVC, Entity Framework). Designed, built, and tested RESTful API endpoints using Postman. Wrote and optimized T-SQL queries against SQL Server. Developed and maintained company websites. Investigated and resolved production bugs through structured debugging.

Contributed to development, testing, and deployment of a live ERP system (C#, ASP.NET MVC, Entity Framework) supporting SACCOs and a church organization in Kenya. Cleaned, validated, and migrated client data into the ERP system via SQL Server. Performed functional testing of application features.