Sr Software Engineer / Active TS/SCI

Responsibilities Peraton is currently hiring a Senior Full Stack Software Engineer (O&M) to support our Operations and Maintenance (O&M) team to support a mission-critical enterprise application used by the federal government, ensuring reliability, security, and continuous modernization of a complex production environment.Location: Washington, DC Role OverviewIn this role, you will sustain, optimize, and enhance a mature enterprise application. Your focus will be on stability, refactoring, troubleshooting, and implementing minor feature enhancements across Angular front ends and .NET Core microservices.Key Responsibilities: Maintain and optimize existing .NET Core microservices and ASP.NET applications for high availability and performance.Troubleshoot, debug, and upgrade Angular-based Single-Page Applications (SPAs).Manage and tune SQL Server databases, including repairing stored procedures and improving query performance.Analyze legacy application logic to identify and resolve high-priority bugs and production incidents.Apply security patches, performance improvements, and minor feature enhancements based on stakeholder needs. Qualifications Minimum Qualifications: Bachelor’s degree in Computer Science, Engineering, or equivalent experience.10+ years of hands-on full-stack engineering experience, with emphasis on O&M or legacy system maintenance.Strong back-end expertise in C#, .NET Core, ASP.NET, and reverse engineering/debugging.Proven experience maintaining and refactoring Angular/TypeScript production codebases.Advanced skills in SQL Server, T-SQL, and performance tuning.U.S. citizenship required.Active Top Secret clearance with SCI eligbility and eligible to obtain a polygraph. Preferred, Nice to Have Qualifications: Experience with ElasticSearch for log monitoring and troubleshooting.Ability to maintain and update SQL Server Reporting Services (SSRS) reports.Familiarity with Ext JS for supporting older UI components. Peraton Overview Peraton is a next-generation national security company that drives missions of consequence spanning the globe and extending to the farthest reaches of the galaxy. As the world’s leading mission capability integrator and transformative enterprise IT provider, we deliver trusted, highly differentiated solutions and technologies to protect our nation and allies. Peraton operates at the critical nexus between traditional and nontraditional threats across all domains: land, sea, space, air, and cyberspace. The company serves as a valued partner to essential government agencies and supports every branch of the U.S. armed forces. Each day, our employees do the can’t be done by solving the most daunting challenges facing our customers. Visit peraton.com to learn how we’re keeping people around the world safe and secure. Target Salary Range $135,000 - $216,000. This represents the typical salary range for this position. Salary is determined by various factors, including but not limited to, the scope and responsibilities of the position, the individual’s experience, education, knowledge, skills, and competencies, as well as geographic location and business and contract considerations. Depending on the position, employees may be eligible for overtime, shift differential, and a discretionary bonus in addition to base pay. EEO EEO: Equal opportunity employer, including disability and protected veterans, or other characteristics protected by law. Job SummaryRequisition ID: 2026-168682Position Category: Information TechnologyClearance: Top Secret/SCI w/Poly