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Oh011/README.md

Hi, I'm Omar Hisham 👋

I'm a Backend Software Engineer (ASP.NET Core) and Computer Science student at Cairo University.

I focus on building scalable backend systems, distributed architectures, and event-driven applications using .NET technologies.

I enjoy designing systems with real-world constraints like performance, consistency, caching, and messaging.

🧠 What I Do

  • Backend Development with ASP.NET Core
  • Clean Architecture & CQRS
  • Distributed Systems (RabbitMQ, Redis, Background Jobs)
  • API Design & System Design
  • Database Design (SQL Server, PostgreSQL)
  • Basic Frontend Integration (Angular)

🛠 Skills & Tools

Languages: C#, C++, Python, SQL, JavaScript
Backend: ASP.NET Core, EF Core, MediatR, SignalR
Architecture: Clean Architecture, CQRS
Messaging & Caching: RabbitMQ, Redis
Databases: SQL Server, PostgreSQL
Dev Tools: Git, Docker, Visual Studio
Concepts: System Design, SOLID, Design Patterns

🚀 Featured Projects

🧾 Inventory & Order Management System

🔗 GitHub: https://github.com/Oh011/Inventory_system
🔗 API (Swagger): [http://smartinventory.runasp.net/swagger]

A full-scale backend system built with ASP.NET Core using Clean Architecture and CQRS.

  • 70+ REST APIs covering full business workflow (inventory, sales, purchasing)
  • Role-based authentication (JWT + Refresh Tokens)
  • Real-time updates using SignalR
  • Domain Events for decoupled architecture
  • Background processing with Hangfire
  • PDF generation for invoices and reports
  • Optimistic concurrency control for stock safety

🔔 Notification Service

🔗 GitHub: https://github.com/Oh011/notification-service

Event-driven notification system built for scalable messaging.

  • RabbitMQ-based event processing pipeline
  • Queue separation per channel (Email / In-App)
  • Retry mechanism + Dead Letter Queue (DLQ)
  • Redis caching for subscribers and preferences
  • API Key secured external integration layer
  • Supports high-throughput async notifications

🔗 URL Shortener System

🔗 GitHub: https://github.com/Oh011/url-shortener
🔗 API (Swagger): [http://swifturl.runasp.net/swagger]

Scalable URL shortening service designed with real-world constraints.

  • Base62 short code generation (collision-safe)
  • PostgreSQL sharding with consistent hashing
  • Redis caching achieving high redirect hit rate
  • Async analytics tracking using background jobs
  • Designed for high read/write ratio workloads

🖥 Virtual Machine (C++)

🔗 GitHub: https://github.com/Oh011/Machine-simulator

Custom CPU simulator implementing low-level instructions and memory operations.

🛒 Fresh Cart – Angular E-Commerce

🔗 GitHub: https://github.com/Oh011/E-commerce
🔗 Live: https://oh011.github.io/E-commerce

A modern single-page e-commerce application built with Angular and TypeScript.

📊 GitHub Stats

stats

langs

📫 Contact

Pinned Loading

  1. Inventory_system Inventory_system Public

    Inventory & Order Management System built with ASP.NET Core, Clean Architecture, CQRS, SignalR, and EF Core with real-time stock control, purchase orders, invoicing, PDF exports, and domain event-d…

    C# 1

  2. NotificationService NotificationService Public

    ASP.NET Core Notification Service supporting topic-based notifications, RabbitMQ async processing, Redis caching, retries, DLQ, and real-time delivery.

    C# 1

  3. Task-Management-System Task-Management-System Public

    C# 1

  4. url-shortener url-shortener Public

    Scalable URL shortener built with ASP.NET Core and Clean Architecture

    C# 1

  5. Api-Ecommerce Api-Ecommerce Public

    C#

  6. DigitalWalletSystem DigitalWalletSystem Public

    Full-featured digital wallet backend built with .NET 10, Clean Architecture, and CQRS for fintech applications

    C#