Mostafa Mohammad Abu S.Private profile: Upwork shows its earnings only to signed-in members, so we check it every few weeks, not daily. MRR here is a rough estimate (Upwork's six-month earnings ÷ months active). Last read Nov 5, 2026.

Results-driven Senior Software Engineer with 7+ years of experience building scalable, high-performance web applications and backend systems using C#, ASP.NET Core, SQL Server, Angular, and modern cloud technologies. I specialize in designing clean, maintainable architectures and delivering reliable solutions for enterprise-level applications, SaaS platforms, ETL systems, OAuth authentication systems, and AI-powered solutions. I can help you with: - ASP.NET Core / .NET Backend Development - Full-Stack Web Application Development - REST API & Microservice Development - OAuth 2.0 / OpenID Connect Authentication - Microsoft Entra ID / JWT / Role-Based Authorization - AI Agents & AI Workflow Automation - ChatGPT / OpenAI API Integration - ETL & Data Processing Systems - SQL Server, PostgreSQL, Redis & Database Optimization - Angular & Modern Frontend Development - Docker, RabbitMQ, Kafka & Event-Driven Architecture - Clean Architecture & SOLID Principles - System Design & Performance Optimization I have worked with international clients and engineering teams to build scalable SaaS platforms, workflow automation systems, enterprise applications, and cloud-based solutions. My focus is on writing clean, maintainable code and delivering reliable software that solves real business problems. Why work with me? - Strong problem-solving and communication skills - Clean, scalable, production-ready code - Fast learning and adaptability - Reliable delivery and long-term support - Experience leading development teams and architecting systems Whether you need a secure authentication system, scalable backend APIs, AI-powered automation, or a complete full-stack application, I can help deliver high-quality solutions tailored to your business needs.