Open for Backend Opportunities

Hazem Mostafa Khalifa

Backend .NET Developer

I design and build scalable backend systems using ASP.NET Core — focused on performance, security, and real-world reliability.

Reduced API response time by 20% using Redis caching
Optimized database queries, improving performance by 35%
Built multi-tenant systems handling concurrent users efficiently

Clean Architecture Performance Optimization Secure Auth (JWT) Redis Caching
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Hazem Khalifa

About Me

Backend .NET Developer with 2+ years of experience building scalable, production-ready APIs.

I specialize in designing clean architectures, optimizing performance, and delivering reliable backend systems used in real-world applications.

Cairo, Egypt
2+ Years Experience
CS & AI Graduate

Career Milestones

Freelance .NET Developer

Independent
Nov 2025 – Present
  • Delivered financial and booking systems, cutting client manual effort by ~40%
  • Built multi-tenant APIs handling concurrent requests without degradation

.NET Developer

ELC
Aug 2024 – Nov 2025
  • Optimized LINQ queries using indexes & stored procedures, reducing query time by 35%
  • Implemented Redis caching, improving API response time by 20%
  • Automated deployment scripts, reducing server downtime by 15%
  • Containerized environments with Docker, eliminating environment-specific bugs entirely
  • Wrote xUnit test coverage, ensuring 100% core business logic reliability

Featured Creations

Real-world applications built with precision and modern best practices.

Private Client Project

ERP Financial System

  • Built a financial transaction management system using ASP.NET Core MVC and N-Tier Architecture.
  • Implemented Repository, Unit of Work, and Factory Design patterns for a clean, maintainable codebase.
  • Integrated ASP.NET Core Identity with role-based authorization for secure multi-user access.
  • Automated background tasks using ASP.NET Core BackgroundService for scheduled financial processing.
  • Handled large financial datasets with optimized SQL queries and indexing.
  • Generated financial reports with PDF export support.

🔹 Problem Businesses need a reliable system to track and manage financial transactions securely

🔹 Solution Built a full MVC web app with role-based dashboards, audit logs, and PDF reporting

🔹 Impact Automated scheduled financial processing, reducing manual effort by ~40%

ASP.NET Core MVC N-Tier Identity Repository Factory Unit of Work BackgroundService AutoMapper Fluent Validation Serilog PDF Export
Talabat Food Delivery
Source Live Demo

Talabat – Food Delivery API

  • Engineered a RESTful API with 15+ endpoints using ASP.NET Core and Onion Architecture.
  • Integrated Redis caching to reduce database query load by 30%, with JWT-based authentication supporting Admin, Vendor, and Customer role-based authorization.
  • Architected a clean data access layer using Repository, Unit of Work, and Specification patterns.
  • Engineered 15+ endpoints handling concurrent requests at scale with optimized response times.

🔹 Problem Customers need a fast, reliable way to browse restaurants and place orders online

🔹 Solution Delivered a production-ready API with secure auth, caching, and payment integration

🔹 Impact Reduced database query load by 30% using Redis caching & optimized response times

ASP.NET Core Onion Architecture Redis JWT Repository Stripe Unit of Work SQL Server Specification
Tazkarti Event Booking
Source Live Demo Demo Video

Tazkarti – Event Booking System

  • Created a ticket reservation system with ASP.NET Core 10 MVC, N-Tier Architecture across 3 layers using Repository and Unit of Work patterns.
  • Integrated Stripe Checkout for payments and ASP.NET Core Identity for 2+ role-based authentication.
  • Delivered bilingual (EN/AR) RTL support, PDF ticket generation with QR codes and Arabic text reshaping.
  • Authored 20+ unit tests with xUnit and Moq, validating 100% core business logic reliability.

🔹 Problem Users need a simple, reliable way to discover and book event tickets online

🔹 Solution Developed a secure, scalable backend system with booking, payments & bilingual support

🔹 Impact Improved query performance by ~30% using indexing & query optimization, and ensured reliability with 20+ unit tests

ASP.NET Core MVC N-Tier Repository Unit of Work Stripe Identity RTL Support QR Code PDF Export xUnit Moq Serilog

Technical Skills

My core technology stack and specialized domain expertise.

Backend
ASP.NET Core Web API C# ASP.NET Core MVC Entity Framework Core LINQ
Database
SQL Server Redis
Design Patterns
& Architecture
Clean Architecture Onion Architecture Repository Unit of Work CQRS SOLID Principles Factory Pattern
Security
ASP.NET Core Identity JWT Authentication
Tools
Hangfire Serilog AutoMapper Fluent Validation Git xUnit Docker BackgroundService

Why Me?

What sets me apart as a backend developer.

Scalable Systems

Strong understanding of scalable backend architecture — from clean layered design to efficient caching strategies.

Clean, Maintainable Code

I write code that's easy to read, test, and extend. SOLID principles and design patterns are second nature.

Performance Obsessed

Passionate about optimization — from SQL query tuning and Redis caching to reducing response times at every layer.

Academics & Growth

Banha University

Bachelor of CS & AI

Grade: Very Good (2020-2024)

ITI Intensive Training

Full-Stack .NET Development

Summer 2024

ASP.NET Core & SQL Server Diploma

ASP.NET Core & SQL Server Diploma

Nov 2023 – Jul 2024

Actively Seeking Backend Roles

📩 Let's Build Something Great Together

I'm actively looking for Backend .NET Developer roles.
If you're looking for a backend developer who can deliver scalable, production-ready systems — let’s talk.

hazemkhalifa1250@gmail.com +20 155 453 2035 Download CV