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 Minimum of 5 years of experience as a software engineer in backend development Strong experience building applications using .NET (C#) Experience developing and maintaining GraphQL APIs Experience with Postgres and/or MSSQL databases Experience designing and maintaining data models and schemas Experience serving as a senior or lead engineer on development projects - Experience with Agile methodologies, Docker/containerization, and CI/CD pipelines - Ability to work independently and collaboratively while mentoring junior developers - Strong experience gathering requirements and working directly with stakeholders Preferred Qualifications Experience working with legislative systems or legislative data Experience with 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. About Mobomo: Mobomo is a full-service DevOps agency dedicated to creating elegant solutions to solve complex problems. Mobomo benefits include health care, paid time off, retirement savings and professional development. Mobomo is an equal opportunity employer and we value diversity at our company. We do not discriminate on the basis of race, religion, color, national origin, gender, gender identity or expression, sexual orientation, age, marital status, citizenship status, veteran status, disability status or any other basis as protected by federal state, or local law.