Omar Mohamed Fathy Abd Elhady OmarMahamad

⚡ Omar Mohammed | Software Engineer (.NET & AI Systems)

🎓 B.Sc. in Artificial Intelligence | 🏆 ITI Graduate (.NET Track) | 📍 Cairo, Egypt

💡 About Me

I am a Software Engineer specializing in .NET Back-End Architecture and AI-Driven Cloud Systems. Blending a formal academic background in Artificial Intelligence Engineering with enterprise .NET practices, I architect resilient, scalable, and zero-trust backend systems adhering strictly to Clean Architecture and Domain-Driven Design (DDD).

🚀 Production-Tested Scale: Solo architected the backend for a commercial AI voice platform serving 500+ active users with 99.9% uptime.
🏛️ Domain-Driven Design (DDD): Deep hands-on experience enforcing domain invariants, rich entities, immutable Value Objects, and transactional domain events.
⚡ High Concurrency & Fault Tolerance: Designing resilient APIs utilizing atomic credit locking, race-condition mitigation, and asynchronous background worker queues.
🛡️ Zero-Trust Security & Anti-Fraud: Implementing advanced cryptographic protections, HMAC verification, device fingerprinting, and defensive media pipelines.

🏆 Featured Flagship Case Studies

🎙️ Case Study 01: Sada AI — Commercial AI Audio Platform

Role: Solo Backend Architect & Engineer | Status: Production / Commercial | Link: sadaai.io

A high-concurrency commercial Arabic Text-to-Speech (TTS) and voice orchestration SaaS engineered from scratch.

📈 Commercial Scale: Orchestrates 168+ AI voice profiles across multiple upstream vendors, serving 500+ users with 99.9% production uptime.
⚡ High-Concurrency TTS & Atomic Locking: Built an intelligent provider-routing abstraction with smart request queuing and atomic credit locking to completely eliminate race conditions and prevent wallet overspending during high-traffic spikes.
🛡️ In-House Device Intelligence & Anti-Fraud: Engineered a custom risk-operations engine detecting account farming and free-tier entitlement abuse using device clustering, browser fingerprinting, and HMAC-signed installation tokens.
🔒 Defensive Media Security Pipeline: Integrated low-level media sanitization using SkiaSharp to inspect magic bytes and re-encode user-uploaded imagery, neutralizing steganography and polyglot payloads prior to Cloudflare R2 persistence.
🌐 Hardened Linux Infrastructure: Orchestrated rootless Docker deployments behind an NGINX reverse proxy with Cloudflare Origin TLS, automated EF Core migrations, and server-side telemetry via Meta Conversions API (CAPI).

Tech Stack: .NET 9 C# Clean Architecture (DDD) EF Core SQL Server 2022 Cloudflare R2 & WAF Docker NGINX Serilog

⚡ Case Study 02: Temp-Back_End — Enterprise Web API Foundation

Role: Author & Maintainer | Status: Open Source | Repo: github.com/OmarMahamad/Temp-Back_End

An enterprise-grade, production-ready .NET 9 Web API starter template built with strict Clean Architecture, Domain-Driven Design (DDD), and automated CI/CD.

📊 Commercial Impact: Adopted across 3 commercial client implementations, slashing initial backend scaffolding and setup time by 50%.
🛡️ Zero Build Degradation: Maintained 0 Errors, 0 Warnings under strict compiler analyzers and automated static checks.
🧪 Comprehensive Test Harness: 58 automated unit tests (xUnit + Moq) executing in ~1.0 second with 100% pass rate.
🔑 Zero-Trust Identity Hardening: PBKDF2 cryptographic hashing (100,000 iterations + 128-bit salt), constant-time comparisons (CryptographicOperations.FixedTimeEquals) to eliminate timing attacks, and stateful JWT with 7-day sliding refresh token rotation and multi-device revocation.
🔄 Automated Domain Events: MediatR-powered domain event publication dispatched automatically inside EF Core's ChangeTracker during SaveChangesAsync.

┌─────────────────────────────────────────────────────────────┐
│                      Presentation / API                     │
│  Controllers ── Swagger / OpenAPI ── RFC Exception Filters  │
└──────────────────────────────┬──────────────────────────────┘
                               │ references
┌──────────────────────────────▼──────────────────────────────┐
│                      Application Core                       │
│    Commands & Queries (CQRS / MediatR) ── DTOs ── Mappers   │
└──────────────┬──────────────────────────────┬───────────────┘
               │                              │
    implements │                              │ references
┌──────────────▼──────────────┐┌──────────────▼───────────────┐
│        Infrastructure       ││            Domain            │
│  EF Core 9 ── SQL Server    ││  Entities (Private Setters)  │
│  Cloudinary CDN ── Docker   ││  Value Objects ── Domain Evt │
└─────────────────────────────┘└──────────────────────────────┘

Tech Stack: .NET 9.0 C# 13 EF Core 9 SQL Server 2022 Docker GitHub Actions (CI/CD) xUnit / Moq MediatR

🛠️ Technical Arsenal

Domain	Technologies & Frameworks
Backend & Core
Architecture & Design
Databases & Storage
DevOps & Cloud
Testing & Reliability

📈 GitHub Insights

🎓 Education & Professional Foundation

B.Sc. in Artificial Intelligence — Egyptian Russian University (Graduation Project: One Blood — Grade: A+)
Information Technology Institute (ITI) — Back-End .NET Development Track (Intensive Program)
Industry Experience: Full-Stack .NET Developer at Clutch (Jan 2026 – Jun 2026: Engineered API & SQLite synchronization, background worker services, and resolved 70+ compiler warnings across POS/Inventory modules).
Leadership & Awards: Backend & AI Team Lead at the Grand Egyptian Museum (GEM Hackathon 2) — Led overnight delivery of an AI vision & tourist engagement pipeline, ranking among Top 30 Teams Nationwide prior to the museum's opening.

🤝 Let's Build Something Exceptional

Open for Back-End .NET Engineer and AI Systems Integration opportunities.

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