09/04/2026 updated

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Senior Full-Stack Engineer | Senior .NET Developer (B2B Contractor)

Istanbul, Turkey
Only remote
B.S. in Information Technology
Istanbul, Turkey
Only remote
B.S. in Information Technology

Profile attachments

2026-09-MazenQasem.pdf

About me

Highly accomplished Senior Full-Stack Engineer with over 15 years of experience architecting scalable web applications, enterprise micro-services, and cloud/on-premise hybrid systems

C Sharp (Programming Language)Health Information Management
Hochqualifizierter Senior Full-Stack-Entwickler mit über 15 Jahren Erfahrung in der Architektur skalierbarer Webanwendungen, Enterprise-Microservices und Cloud-/On-Premise-Hybridsystemen. Nachweisliche Erfolge als freiberuflicher B2B-Auftragnehmer für internationale Kunden in den Bereichen Gesundheitswesen (Krankenhausinformationssysteme), Logistik, E-Commerce und Agrartechnologie. Experte für das Microsoft .NET-Ökosystem, moderne JavaScript/TypeScript-Pipelines, Datenbank-Performance-Optimierung und Middleware zur schichtübergreifenden Datensynchronisierung. Autor veröffentlichter Open-Source-Entwicklungstools für Unternehmen auf NuGet.

Experience

Professional experience10+ years
Freelancer since2023

Languages

ArabicNative speakerEnglishFluent

Project history

Freelance Lead Architect & Senior B2B Contractor

Freelance (Industrial AgTech - Ommat Egg Farms)
Architected a multi-tenant enterprise management system for tracking poultry production lifecycles and daily health/yield metrics against industrial benchmarks. Reduced server resource utilization (RAM and CPU usage by 58%) by optimizing EF Core LINQ queries, eliminating unhandled exceptions, and resolving architectural performance warnings.

Author & Maintainer

ADT.AspNetCore.Mvc.Vite (NuGet Package)
Architected and published a high-performance open-source framework bridging ASP.NET Core MVC with Vite frontend build workflows. Integrated enterprise-grade components including SignalR hubs, Serilog logging, and automated production console clearance. Implemented automated CI/CD deployment pipelines via GitHub Actions and Trusted Publishing to NuGet.org.

Freelance Lead Architect & Senior B2B Contractor

Freelance (Multi-Vendor SaaS - Sublint Market)
Developed a high-throughput e-commerce platform supporting thousands of daily transactions, featuring registration-free dynamic guest checkouts and automated barcode generation.

Freelance Lead Architect & Senior B2B Contractor

Freelance (TGC Container Portal - Logistics Modernization & Hybrid Sync Engine)
Architected and deployed an ASP.NET MVC web application for local container inspection workflows on-site. Re-engineered the local application into a secure, multi-tenant cloud portal granting remote access to port authorities and external stakeholders, cutting manual data entry by 70%. Designed and built a custom, fault-tolerant bidirectional middleware that continuously synchronizes local legacy databases with cloud SQL infrastructure in real time, with custom retry-logic, transaction logs, and payload validation.

Senior Full-Stack Developer

Blue Bird Global Company
Architected a centralized financial and sales reporting system using ASP.NET MVC and MySQL, cutting manual report processing time by 50%. Designed automated database maintenance routines, indexing strategies, and disaster recovery protocols, maintaining 100% data integrity.

Modernization Lead & QA Lead

Saudi German Hospitals Group
Directed the enterprise modernization of mission-critical healthcare systems (HIS) from legacy VB6 and Oracle Dev2000 to modern .NET Web frameworks. Led high-volume data migration strategies, accurately migrating millions of electronic health records across MS SQL Server and Oracle databases. Served as QA Lead (2017), establishing structured automated and manual testing standards that uncovered 300+ critical edge-case bugs prior to production releases.

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