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Benefits: Competitive salary Opportunity for advancement Training & development Role: Senior .NET Developer Mainframe Modernization Location: Austin, TX - Remote Why Join Us? Remote work flexibility Long-term contract with strong renewal potential Collaborative Agile team environment Chance to influence enterprise-level architecture and modernization strategy About the Role Were seeking a Senior .NET Developer with prior experience supporting the Railroad Commission of Texas (RRC), ideally in the LoneSTAR application. Youll lead technical initiatives in a high-visibility mainframe modernization projectapplying your deep expertise in .NET Core, C#, MS-SQL, JSON, and Azure technologies to build robust integrations and scalable APIs. This position is ideal for developers with proven state agency experience who can independently navigate complex projects, collaborate across departments, and lead junior developers in delivering secure, high-quality software. Key Responsibilities Lead full SDLC efforts including architecture, coding, testing, deployment, and production support Build modern APIs and microservices using .NET Core, C#, and Azure stack (App Services, Functions, Logic Apps) Enhance and support the LoneSTAR application and associated RBDMS platforms Develop secure, scalable, and testable code using CI/CD practices in Azure DevOps Collaborate with cross-functional teams including PMs, BAs, architects, and DevOps Troubleshoot and resolve complex technical issues and support after-hours deployments Guide and mentor junior developers, conduct code reviews, and contribute to a culture of technical excellence Required Skills & Qualifications Bachelor's in Computer Science or related field 8+ years of .NET development experience with C# 8+ years in .NET Core and team-based environments 2+ years of hands-on experience with the RRC LoneSTAR application Strong SQL Server experience, JSON, Swagger, and production support skills Available for occasional night/weekend deployment support Detail-oriented, self-driven, and comfortable leading initiatives Preferred Skills Experience with GoAnywhere secure file transfer Azure DevOps, Visual Studio IDE, Telerik/Kendo UI Familiarity with microservices, SOA, REST APIs Unit test development and regression analysis PDF generation (e.g., iText), multi-environment Azure deployment This is a remote position.