Mandiseli Mfeya

Developed full-stack web applications using .NET Core, C#, React, and Angular. Created and consumed RESTful APIs to facilitate secure data exchange between services. Optmized backend services integrated with MS SQL Server and MongoDB.

Junior Software Developer - UVU Africa – Capaciti

(2023-01 - 2025-01)

• Developed full-stack web applications using .NET Core, C#, React, and Angular.
• Created and consumed RESTful APIs to facilitate secure data exchange between services.
• Optmized backend services integrated with MS SQL Server and MongoDB.
• Led performance optimization initiatives improving app speed by 35%
• Designed and implemented backend systems for data processing using Node.js and ASP.NET.
• Refactored and optimized front-end and back-end systems, improving performance by 30%.
• Developed React-based UI components and integrated them with Node.js backend.
• Enhanced database performance (MySQL, MongoDB, MS SQL Server) through query optimizations.
• Mentored interns developers during sprints and code reviews
• Key Achievements:
• Refactored legacy APIs, increasing backend performance by 40%
• Introduced monitoring tools for proactive debugging and reliability
• Reason for leaving: I completed my contract successfully.

Freelance Web Developer

(2022-10 - 2024-08)

• Delivered custom CMS websites and e-commerce platforms using WordPress, HTML, CSS, Flutter, Angular, and React
• Developed, updated, maintained, and created company mobile applications using Flutter with MySQL database.
• Integrated Firebase and AWS Lambda for backend features
• Conducted security reviews and performance enhancements
• Delivered client websites, provided technical consultations, and trained end-users.
• Supported clients with device setup, remote troubleshooting, and cloud services.
• Key Projects:
• E-commerce Website (WordPress + WooCommerce)
• Reason for leaving: I completed my contract successfully.

Software Developer Intern - UVU Africa – Capaciti

(2022-07 - 2023-01)

• Developed single-page apps with React, Angular, HTML, CSS, C#, Node.js, MongoDB, ASP.NET, and MS SQL Server
• Engineered scalable modules using ASP.Net Core and React in a microservices architecture
• Worked on web solutions using ASP.Net MVC and React, improving page responsiveness.
• Designed and implemented backend APIs and ensured cross-origin communication.
• Improved data performance by refining queries in MySQL, MS SQL Server and MongoDB.
• Integrated third-party APIs and built internal tools
• Maintained 90%+ code coverage through unit/integration testing
• Created Python scripts and SQL queries for automated reporting
• Delivered interactive dashboards for business analytics
• Assisted with code reviews, security checks, and Agile sprint ceremonies.
• Reason For Leaving: I was internally promoted to a junior developer role.

IT Technical Support - First Choice Varsity College

(2014-04 - 2022-03)

• Delivered 1st and 2nd line technical support to 100+ users.
• Diagnosed and resolved issues related to hardware, software, printers, and networking.
• Supported mobile devices (iOS/Android) and performed installations.
• Managed user accounts via Active Directory and provided access control.
• Installed and configured laptops, mobile phones, switches, and printers.
• Educated users on software and service usage to reduce repeat incidents.
• Reason for leaving: I left because I had to relocate to cape town.

National Diploma - Information Technology - Walter Sisulu University (2008 - 2011)

Grade 12 - Umtata College (2005 - 2007)