Remote .NET Software Engineer – Windows/Desktop Modernization

Triwill Group; United States; Remote; USD 100,000 - 140,000; Full time

Benefits offered by this job

Medical, dental, and vision coverage

401(k) with company contributions

Vacation, sick leave, and holidays

Job summary

Triwill Group is seeking a Software Engineer (Desktop .NET) to keep established government software reliable and evolving while building the next SaaS generation. You will own features across C#, VB.NET, WinForms, .NET Framework, and modern .NET with SQL Server databases, ASP.NET/IIS portals, and data integrations.

You’ll work with domain experts to diagnose issues, improve reliability, and plan thoughtful modernization that reduces risk and improves customer experience.

Qualifications

• 5+ years of professional software engineering experience with substantial .NET application ownership.
• Strong C# experience and practical experience maintaining VB.NET code.
• Experience with both modern .NET and .NET Framework, including Windows desktop development with WinForms or a comparable UI framework.
• Strong SQL Server and T-SQL skills, including stored procedures, query optimization, schema design, and production data troubleshooting.
• Experience with LINQ and Entity Framework or another .NET data-access approach.
• Experience maintaining ASP.NET applications hosted in IIS.
• Experience with reporting tools such as SAP Crystal Reports.
• Practical unit and integration testing experience in established codebases.
• Strong Git fundamentals, including branches, commits, merges, conflict resolution, pull requests, and the ability to diagnose repository state beyond GUI tooling.
• Experience with CI/CD in GitHub Actions, Azure DevOps, or a comparable system.
• Experience creating and maintaining NuGet packages.
• Working knowledge of structured logging, error tracking, monitoring, and production diagnosis.
• Experience working on a modern product team using agile processes.
• Practical experience with AI coding tools such as Claude Code, Codex, or comparable tools.
• Strong interpersonal skills and a tactful, empathetic communication style.

Responsibilities

• Maintain, debug, and extend Windows applications built with C#, VB.NET, WinForms, .NET Framework, and modern .NET.
• Refactor or modernize established code when changes provide clear reliability, maintainability, or customer benefits.
• Improve shared functionality through well-scoped libraries and NuGet packages.
• Develop and tune SQL Server schemas, T-SQL queries, stored procedures, and data-conversion logic with a strong focus on correctness.
• Maintain ASP.NET/IIS web portals and the interfaces between portal, desktop, and database components.
• Build and troubleshoot operational reports, including SAP Crystal Reports, and structured import/export workflows using formats such as JSON and XML.
• Improve development and delivery practices through consistent Git/GitHub workflows, automated builds and testing, packaging, and repeatable releases.
• Strengthen production diagnostics through structured logging, error tracking, monitoring, and tools that help reproduce and resolve customer-reported issues.
• Investigate escalated defects, communicate findings clearly, estimate product work, and carry accepted fixes through release and production follow-up.
• Partner with domain experts and Customer Engineering to understand business rules and develop maintainable product solutions.
• Document product, build, and release knowledge so expertise can be shared effectively across the team.
• Use AI-assisted development tools thoughtfully while remaining accountable for code quality and customer impact.

Skills

C#

VB.NET

WinForms

.NET Framework

ASP.NET

IIS

SQL Server

T-SQL

LINQ

Entity Framework

Git

CI/CD

GitHub Actions

Azure DevOps

NuGet

JSON

XML

REST APIs

AI coding tools

Tools

SAP Crystal Reports

NuGet

Job description

Triwill Group is seeking a Software Engineer (Desktop .NET) to keep established government software reliable and evolving while building the next SaaS generation. You will own features across C#, VB.NET, WinForms, .NET Framework, and modern .NET with SQL Server databases, ASP.NET/IIS portals, and data integrations.

You’ll work with domain experts to diagnose issues, improve reliability, and plan thoughtful modernization that reduces risk and improves customer experience.