Hazem Khalifa

I’m a .NET Backend Developer with 2+ years of experience building RESTful APIs and ASP.NET Core MVC systems, focused on Clean Architecture and performance optimization. I enjoy turning complex business requirements into maintainable services with clear separation of concerns.

In my freelance work, I designed and delivered an ERP Financial System with role-based authorization, API security, and background processing. I applied Clean Architecture principles (Repository/UoW/Factory), FluentValidation, AutoMapper, Serilog, and automated PDF report export to deliver production-ready outcomes.

Previously, I optimized LINQ queries using stored procedures and Redis caching, improving API response time by 20% and reducing downtime by 15% through deployment scripts. I also strengthened quality with xUnit tests, containerized development environments with Docker, and mentored junior developers during onboarding and code reviews.

My projects reflect a strong emphasis on secure APIs (ASP.NET Core Identity, JWT authentication, role-based authorization), reliable architecture (Onion/Clean patterns, CQRS), and scalable operations (BackgroundService, structured logging, global exception handling). I’m excited to keep building cloud-ready, secure backends that perform under real load.