We are seeking a full-time, backend-focused Senior .NET Developer to support application modernization initiatives and ongoing maintenance of legacy systems. This role requires a hands-on engineer with strong experience in modern backend technologies, containerized environments, and CI/CD pipelines, as well as the ability to lead and mentor other developers. Responsibilities Participate in the analysis, design, and development of system modernization efforts Support and enhance existing legacy applications Lead and contribute to Agile development activities, including standups, user stories, backlog grooming, and task execution Build, maintain, and enhance backend services using .NET (C#), GraphQL, and relational databases Contribute to and support CI/CD pipeline development and deployment processes Implement and maintain containerized solutions and troubleshoot deployment issues Design and implement unit tests, review load testing results, and identify performance bottlenecks Troubleshoot defects and recommend system optimizations and enhancements Collaborate closely with stakeholders and a small development team, providing technical guidance and mentorship Required Qualifications Strong experience gathering requirements and working directly with stakeholders Preferred Qualifications Experience working with legislative systems or legislative data Microsoft Azure Familiarity with MEAN stack (MongoDB, Express, Angular, Node.js) and/or React.js Location Capitol Hill, Washington D.C. Some work may be performed off-site with approval and at the discretion of the POC.