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Mark Happel

@markhappel

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I build and modernize high-performance .NET applications, APIs, SQL Server systems, and automated delivery pipelines.

United States

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What I'm looking for

I'm looking for software engineering or freelance opportunities where I can build and modernize .NET applications, improve data-intensive systems, and own work from requirements through deployment.

I've built enterprise software at ARS National Services, Scantron, Genesys, and Forte, with a focus on modernizing .NET applications, improving SQL Server performance, and delivering reliable web, desktop, and data-processing systems. At ARS, I reduced database latency by up to 40%, automated ETL work that saved more than 20 hours weekly per engineer, and cut manual reporting effort by 90%.

I'm currently building a production-grade full-stack Blazor WebAssembly application independently, covering REST APIs, authentication, Azure deployment, Azure SQL, GitHub Actions, and ongoing maintenance. I also bring team leadership experience, including leading five engineers at Scantron, along with deep experience in C#, .NET, SQL Server, CI/CD, and legacy modernization.

Experience

Work history, roles, and key accomplishments

Senior Application Engineer (.NET/C#)

ARS National Services

Feb 2017 - Mar 2025 (8 years 1 month)

Developed multi-tenant .NET Core applications with Razor Pages and Entity Framework, optimized SQL Server databases, and led migration to Azure DevOps with CI/CD automation.