Senior .NET Developer

Senior .NET Full-Stack Developer , Saint Louis, MO (remote/on-site when required). Clearance Required None; MoDOT MACHS background check required. Position Summary The Senior .NET Full-Stack Developer is the primary application-layer engineer on the TMS contract. This individual owns break/fix resolution, preventive maintenance, and SOW development across the most complex TMS modules: Bridge Management System (124K+ lines, MVC), MMS (MMSBusLayer 146K+ lines, MMSWebApp 135K+ lines), SIMS (58K+ lines), Railroad Management System (54K+ lines), and the Travelways suite. The developer follows MoDOT Best Practices, participates in code walkthroughs, and maintains third‑party dependency currency (DevExpress 24.2+, .NET 8+, C# v12). Key Responsibilities Diagnose, resolve, and document all error and malfunction reports within the 2‑business‑day SLA (§2.3.5); deliver code corrections with documentation adequate to explain the problem resolved and any operational differences. Maintain and enhance TMS applications across the .NET Webforms and ASP.NET MVC stack using C#v12, Visual Studio (current release), Azure DevOps, and GIT source repository. Perform preventive maintenance: small modifications to retain or restore functionality, production monitoring to detect errors, and regular updates to 3rd‑party dependencies including DevExpress24.2+ and code-language versions (§2.3.8). Develop SOW programming deliverables on schedule and within firm‑fixed hours; stage work for MoDOT system test per approval workflow. Participate in code and architecture walkthroughs per MoDOT Best Practices (§2.2.3); follow all MoDOT coding standards. Support impact analysis before each release: identify and document effects of proposed changes on data-dependent TMS modules (§2.3.8). Enter all time worked into MoDOT's Service Desk Plus at end of each week; resolve assigned tickets within timeframes agreed with the Project Manager. Maintain compatibility with MoDOT's evolving infrastructure: implement modifications within 30 days of notification of any architecture change (§2.1.5). Produce and maintain technical documentation (engineering notebooks, flowcharts, code commentary) as part of Technical Records obligations (§2.3.4). Ensure all developed solutions meet ADA/Section508 accessibility standards; document and review recommendations with MoDOT before development. Required Qualifications Minimum 3years of professional .NET application development experience (C#, ASP.NET MVC, .NET Framework and/or .NET8+). Minimum 1year of experience with Webforms and MVC web development in a .NET environment (§2.2.3). Minimum 1year of experience with Web Services (SOA) (§2.2.3). Minimum 1year of experience with REST/SOAP APIs (§2.2.3). Experience with Oracle database in a .NET application context. Experience with Azure DevOps and GIT source control. Minimum 1year of experience similar to MoDOT's current computer technical architecture. Ability to pass MoDOT background check. Preferred Qualifications Minimum 1year of experience with Oracle Spatial database (§2.2.3). Minimum 1year of experience with transportation-related applications (§2.2.3). Experience with location referencing applications and data (§2.2.3). Experience with DevExpress controls in a .NET web application. Familiarity with Crystal Reports for report modification embedded in .NET applications. Experience with ESRI ArcGIS SDK/API integration within .NET web applications. Missouri residency or St.Louis metro area location. What’s in It For You Full Benefits Package 10 Days PTO 10 Paid Holidays 401K #J-18808-Ljbffr