Serg M.

.Net developer · Blazor developer · .Net full stack · 15+ years in enterprise software I do not do quick fixes. I find out why the system got slow, why releases hurt, and why nobody wants to open that project — then I fix that instead of the symptom. One person for the database, the API and the UI ✔️ 🧭 WHEN PEOPLE CALL ME • A legacy .NET system blocks every new feature, and touching it feels like a gamble • Reporting screens are so slow that people export to Excel and work there instead • Performance and tech debt reach customers before anyone files a ticket • Two contractors build one product, and the seam between them shows in the UI • The code has to keep working long after the developer who wrote it is gone 📊 WHERE THIS HAS BEEN TESTED 15+ years as a .net developer across logistics, healthcare, fintech and banking, UK insurance, government services and back-office SaaS. 5,000+ hours delivered on Upwork at 100% Job Success. The oldest system I still maintain was written before Blazor existed; the newest is .NET 8 with blazor webassembly on top. ⚙️ HOW I BUILD I am a .net developer first: C#, ASP.NET Core, APIs, SQL, and service boundaries that still make sense a year later. Then a blazor developer — 5+ years in, blazor server where the screen has to be live, blazor webassembly where it has to survive a bad connection — so the UI is never somebody else's problem. Then a .net full stack engineer, because the schema and the screen are the same conversation. • Services — asp.net, ASP.NET Core, ASP.NET Web API, ASP.NET MVC, .NET Framework, .net core, restful api • Data — .net backend work on Entity Framework or hand-tuned SQL against Microsoft SQL Server and MySQL • UI — blazor webassembly, blazor server, .net blazor, blazor c#, MudBlazor, blazor syncfusion and blazor telerik for dense grids and real reporting • Legacy — .NET Framework and WCF moved to .net core in deployable stages, no feature freeze • Cross-platform — blazor maui as a maui developer and c sharp developer, clean mvvm • Cloud — azure serverless and azure function where they actually fit Frontend when a project already lives there: HTML, HTML5, CSS, CSS 3, JavaScript, jQuery, Angular, AngularJS, React, Node.js. Also Web Design, WordPress integrations and light Adobe Photoshop. 🎯 WORK THAT FITS ME BEST • Legacy .NET Framework to .net core migrations without a rewrite • Reporting and back-office platforms with heavy data grids • Secure api and .net backend systems led by a .net backend developer • Blazor web platforms led by a blazor developer • .net full stack dashboards and internal tooling • Xamarin to MAUI moves and cross-platform apps 🚧 WHAT I WILL PUSH BACK ON • A rewrite, when a staged migration ships sooner and costs less • A framework picked because it looked good in a conference talk • "Just make it faster" before anyone has measured what is actually slow • A deadline that assumes nothing will be discovered along the way I would rather have that argument in week one than in month four. 🤝 WHAT WORKING WITH ME IS LIKE One senior .net developer owns the domain model and the APIs, the same blazor developer ships the UI without a second contractor, and .net full stack ownership runs from first commit to production. I finish things end to end instead of leaving seams between layers. I write updates you can read in thirty seconds. I say "I do not know yet" instead of guessing, then come back with an answer. If something is going to slip, you hear it early and not on the deadline. 🧩 HOW IT RUNS Discovery → technical alignment → architecture → iterative delivery → documentation → handover. You always know what is being built, why, and what comes next. At the end you get working software, a schema that explains itself, and enough written down that the next .net developer or blazor developer does not need me on a call. 🛠️ ALSO IN SCOPE Angular, AngularJS, React and Node.js as a react node developer, plus xamarin, wordpress, figma, Adobe Photoshop, Web Design, flutterflow and obs. I can slot into a java developer heavy team and keep css responsive layouts consistent. As an AI-Assisted Dev I run Cursor, cursor.ai, Claude, GitHub Copilot and agentic ai review-first: the tools draft, I verify, the tests decide. 📍 AVAILABILITY Working hours overlap solidly with EU and US teams. Clear English, a predictable schedule, and a codebase treated like it has to outlive the contract — because it usually does. If you need a senior .net developer, a strong blazor developer and real .net full stack ownership in one hire, let's talk. ❋═══════❋═══════❋ 💙💛 In times of war, code can still be an act of peace. I'm based in Ukraine and continue to deliver production-grade software from a secure location. By working with me, you're not only hiring a professional — you're supporting a people who keep building, even under fire. Let's create something impactful together. ✨