Waseem A.

✅ Top Rated Plus | 100% Job Success | 6,500+ hours | $200K+ earned on Upwork ✅ Senior .NET Engineer: 17 years building backends that scale under real load ✅ Architecture-level work: high-traffic APIs, system integrations, SQL performance ✅ Delivered for Tractor Supply (Fortune 500), Allivet & Edible Arrangements I build .NET backends that stay fast and correct when the load is real. Most of my work is the hard part, the systems that handle traffic, money and third-party integrations without falling over, and clients usually bring me in when something is slow, duplicating data, or breaking at peak. 𝗥𝗲𝗰𝗲𝗻𝘁 𝗪𝗼𝗿𝗸 ➜ Allivet & Tractor Supply (Fortune 500): Multi-Tenant REST API Tech: ASP.NET Core (.NET 6), Azure Service Bus, Redis, Azure Functions, SQL Server, Splunk 🔹Stopped duplicate orders during request retries by adding idempotency keys 🔹Moved slow blocking calls onto Service Bus with background workers to cut response times 🔹Used Redis caching and Azure Functions to keep products, customers and subscriptions syncing reliably to the Salesforce Commerce storefront ➜ Allivet Web Admin: E-Commerce & Subscription Platform Tech: .NET Core, Web API, SQL Server, Azure, CommerceHub, Deposco 🔹Integrated CommerceHub payment gateway: card tokenization, authorization, capture, void and refund 🔹Connected Deposco warehouse management and rebuilt the financial posting process 🔹Ran the full catalog, orders, autoships, inventory and warehouses end to end ➜ Franchise Management System (ERP): used by 150+ international clients Tech: ASP.NET MVC, Web API, Azure, SQL Server 🔹Architected and optimized the central platform serving 150+ franchise clients worldwide 🔹Exposed REST APIs for mobile apps using Repository, Unit of Work and Singleton patterns 🔹Built the supporting systems too: video training (Wowza streaming), field audit tools, and a marketplace with Amazon Pay and BlueSnap ➜ County Taxation Filing System Tech: ASP.NET Core, Azure Functions, Logic Apps, Angular 10, SQL Server 🔹Built yearly tax filing with PDF generation and historical data imports 🔹Rebuilt a batch engine that brought large-scale query processing down from minutes to seconds 𝗪𝗵𝘆 𝗖𝗹𝗶𝗲𝗻𝘁𝘀 𝐇𝗶𝗿𝗲 𝗠𝗲 ✔ End-to-end ownership: from architecture and database design through to deployment, not just the coding in the middle ✔ I solve the hard backend problems: idempotency, event-driven sync, the outbox pattern, background jobs, multi-database setups, and SQL that's slow under load ✔ AI-augmented delivery: I use Claude Code and GitHub Copilot every day to move faster on scaffolding, refactoring and debugging, and I review everything they produce ✔ Clear and reliable: regular updates, no surprises, no ghosting 𝗖𝗼𝗿𝗲 𝗦𝘁𝗮𝗰𝗸 ASP.NET Core, C#, Web API (REST & SOAP), SQL Server, Entity Framework, Azure (Service Bus, Functions, App Service, Logic Apps), Redis, Angular, Splunk If you've got a .NET system that's slow under load, an integration that keeps failing, or an API that needs to scale, send me the details and I'll tell you how I'd approach it.