Available for Backend Roles

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 40% at Poktco (Saudi Arabia) Optimized database queries, improving performance by 35% Built multi-tenant systems handling concurrent users efficiently
Clean Architecture Performance Optimization Secure Auth (JWT) Redis Caching CI/CD
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Hazem Khalifa
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About Me

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

I specialize in designing clean architectures, optimizing performance, and delivering reliable backend systems — from ERP financial platforms and HR management systems to e-commerce APIs and real estate platforms.

Cairo, Egypt
2+ Years Experience
CS & AI Graduate

Career Milestones

Freelance .NET Developer

Independent Egypt
May 2025 – Present
  • Designed and delivered SaifLine — a production ERP Financial System with RESTful APIs, role-based authorization, and performance optimization via stored procedures (35% query time reduction)
  • Built HRMS — a comprehensive HR management system covering employee profiles, fingerprint-based attendance, payroll, leaves, and hiring workflows with a full employee self-service portal
  • Developed REG? — a scalable real estate platform with property listing, search, and administration features using Clean Architecture
  • Integrated Hangfire background jobs; delivered all projects on time for paying clients

Backend Developer

Poktco Saudi Arabia · Remote
Nov 2025 – May 2026
  • Developed and maintained a full-featured e-commerce API using ASP.NET Core Web API and Clean Architecture
  • Implemented product management, order processing, user authentication, and coupon systems with EF Core and SQL Server
  • Built Excel import/export features, sales analytics, top-selling product tracking, and low-stock alerts
  • Integrated multiple payment gateways and applied Redis caching strategies for improved performance
  • Implemented JWT authentication with refresh tokens and role-based authorization for different user roles
  • Optimized database queries and API endpoints, improving response time by 40%; applied SOLID principles throughout

.NET Developer

ELC Egypt
Aug 2024 – Nov 2025
  • Optimized LINQ queries via stored procedures and Redis caching, improving API response time by 20% and reducing server downtime by 15% through CI/CD pipelines
  • Authored xUnit tests covering core business logic, reducing post-deployment bugs; containerized dev environments with Docker
  • Applied secure coding practices including JWT-based auth, role-based authorization, and data validation; mentored junior developers during onboarding and code reviews
  • Managed code via Git/GitHub with branching strategies and pull request workflows

Featured Creations

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

Freelance
Private Client Project

HRMS – HR Management System

  • Built a comprehensive HR system managing employee profiles, fingerprint-based attendance, fixed & shift schedules, and payroll operations (bonuses, deductions, penalties)
  • Implemented leaves management, hiring workflows, and a dedicated employee self-service portal
  • Developed a full reporting system for HR managers to monitor workforce performance and organizational data
  • Used ASP.NET Core Web API, Clean Architecture, EF Core, and role-based authorization

🔹 Problem Companies struggle to manage all employee operations and HR data in one place

🔹 Solution Delivered a full-featured HR platform with self-service portal and advanced reporting

🔹 Impact Automated HR workflows, reducing manual admin effort significantly

ASP.NET Core Clean Architecture EF Core SQL Server JWT Hangfire Serilog
Employment
Private Company Project

Poktco – E-commerce API

  • Developed a full-featured e-commerce REST API using ASP.NET Core Web API and Clean Architecture
  • Implemented product management, order processing, coupon systems, and Excel import/export with sales analytics
  • Integrated multiple payment gateways, Redis caching, and JWT auth with refresh tokens
  • Optimized API endpoints and DB queries, improving response time by 40%

🔹 Problem Business needed a scalable e-commerce backend with analytics and multi-payment support

🔹 Solution Built a production-grade API with caching, analytics, and role-based access

🔹 Impact 40% improvement in API response time through caching and query optimization

ASP.NET Core Web API Clean Architecture EF Core Redis JWT + Refresh Tokens SQL Server SOLID
Freelance
Private Client Project

SaifLine – 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 patterns for a clean, maintainable codebase
  • Integrated ASP.NET Core Identity with role-based authorization and Hangfire for scheduled background processing
  • Generated financial reports with PDF export support; optimized SQL queries with stored procedures (35% query reduction)

🔹 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 Reduced manual effort by ~40% through automated scheduled financial processing

ASP.NET Core MVC N-Tier Identity Hangfire AutoMapper Fluent Validation PDF Export Serilog
Talabat Food Delivery Open Source
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 and role-based authorization
  • Architected clean data access layer using Repository, Unit of Work, and Specification patterns
  • Integrated Stripe payment and handled 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 Stripe Repository SQL Server
Tazkarti Event Booking Open Source
Source Live Demo Demo

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 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 with booking, payments & bilingual support

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

ASP.NET Core MVC N-Tier Stripe Identity RTL Support QR Code PDF Export xUnit Moq
Freelance
Private Client Project

REG? – Real Estate Platform

  • Developed a scalable real estate management system with property listing, search, and administration features
  • Implemented Clean Architecture, EF Core, and SQL Server for robust data management
  • Secured the platform with JWT-based authentication and role-based authorization for different user types

🔹 Problem Agencies need a centralized platform to manage and showcase property listings

🔹 Solution Built a clean, secure real estate API with advanced search and admin controls

🔹 Impact Streamlined property management and improved listing visibility for the client

ASP.NET Core Clean Architecture EF Core SQL Server JWT AutoMapper

Technical Arsenal

My core technology stack and specialized domain expertise.

Backend
ASP.NET Core Web API C# ASP.NET Core MVC .NET Framework SignalR
Database & ORM
SQL Server Entity Framework Core Dapper LINQ Redis
Architecture
Clean Architecture Onion Architecture N-Tier Repository Unit of Work CQRS SOLID Design Patterns
Security
ASP.NET Core Identity JWT Authentication Refresh Tokens Role-Based Authorization
Cloud & DevOps
Azure AWS Docker GitHub Actions CI/CD Git
Testing
xUnit NUnit Moq FluentAssertions Unit Testing Integration Testing
Tools & Libs
Hangfire Serilog NLog AutoMapper Fluent Validation Swagger Postman

Why Me?

What sets me apart as a backend developer.

Scalable Systems

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

Clean, Maintainable Code

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

Performance Obsessed

Passionate about optimization — from SQL query tuning and Redis caching to reducing response times at every layer. Proven 40% API improvement at Poktco.

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

Specialized .NET 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