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Software Developer (.NET MVC / C#)

TriOptus LLC

Saint Paul, MN
Software Developer (.NET MVC / C#)


Location: St. Paul, MN (Hybrid - Onsite Mon/Tue/Thu)


Job Type: Full-Time Contract


Duration: March 16, 2026 - August 31, 2027


Interview Mode: Microsoft Teams

About the Role


We are seeking an experienced .NET Software Developer to support modernization, redevelopment, and critical security updates for large-scale, high-impact justice and public safety applications. This role involves rewriting legacy systems, enhancing existing features, and supporting integrations across multiple enterprise applications.

You will work closely with cross-functional teams-including architects, analysts, QA, and technical stakeholders-to deliver secure, maintainable, and scalable solutions.

Key Responsibilities

  • Modernize and rewrite legacy applications using ASP.NET MVC, C#, .NET 5+ , and modern architectural patterns.
  • Implement application enhancements, security updates, and integration improvements.
  • Develop and support REST/SOAP web services , Windows Services , and Web API components.
  • Collaborate with business analysts, architects, and QA teams to translate requirements into high-quality technical solutions.
  • Participate in Agile Scrum processes, sprint planning, and development ceremonies.
  • Perform unit testing, integration testing, and troubleshoot complex software issues.
  • Support CI/CD pipelines and automation within DevOps environments.
  • Provide knowledge transfer and assist team members with integration and deployment processes.
Required Qualifications
  • 7+ years in ASP.NET MVC development with C# .
  • 5+ years unit testing experience (NUnit preferred).
  • 5+ years working with Entity Framework .
  • 5+ years developing REST/SOAP web services .
  • 5+ years building Windows Services (.NET 5.0 or above) .
  • Strong experience with T-SQL, stored procedures, SQL Server .
  • Skills in HTML, CSS, JavaScript, jQuery, Bootstrap 4/5 .
  • Experience with XML, XSLT , and object-oriented design.
  • Hands-on DevOps CI/CD experience.
  • Ability to triage and resolve complex technical issues.
  • Familiarity with Domain-Driven Design (DDD) .
  • Preferred: Experience with law enforcement or criminal justice systems.
Work Environment
  • Hybrid schedule:
    • Onsite: Monday, Tuesday, Thursday
    • Remote: Wednesday, Friday
  • Onsite location: St. Paul, MN
Why This Opportunity?
  • Long-term engagement (17+ months)
  • Mission-critical modernization work impacting justice and public safety
  • Hands-on work with modern .NET technologies
  • Collaborative environment with cross-functional technical teams



#DotNetDeveloper #CSharpDeveloper #ASPNETMVC #DotNetJobs #SoftwareDeveloper #FullStackDeveloper #CSharp #DotNet #EntityFramework #JavaScript #WebAPI #RESTAPI #SQLServer #DevOps #CICD #AgileDevelopment
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Vacancy posted 2 days ago
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