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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Senior Software Engineer - TS/SCI with Polygraph - **Company:** General Dynamics Information Technology - **Location:** Chantilly, VA, United States - **Experience:** Expert - **Contract:** Permanent contract - **Skills:** JavaScript (Programming Language), Agile Methodology, Amazon Web Services, Component-Based Software Engineering, Application Performance Management, Bootstrap (Software), Information Systems, Linux, Web Development, Electronic Data Interchange (EDI), Ext JS, Design of User Interfaces, Object-Oriented Software Development, Scrum Methodology, Ruby on Rails, Software Engineering, Systems Integration, Web Applications, Enterprise Software Applications, Software Application Programming, Vue.js, Information Technology, Software Version Control, Devsecops - **Published:** October 16, 2026 - **Apply:** https://www.clearancejobs.com/jobs/9245220/senior-software-engineer-tssci-with-polygraph ## About the Role * Self-starter mentality with a strong desire to learn and deliver solutions efficiently to customers. * Strong understanding of software design fundamentals and object-oriented programming principles. * Experience applying modern software engineering principles including SOLID, DRY, KISS, and YAGNI. * Experience working in Linux-based development environments. * Understanding of Git/GitHub source control and Agile development methodologies. * Experience architecting and developing web applications. * Experience developing applications using Ruby on Rails. * Experience with JavaScript frameworks such as ExtJS and/or VueJS. * Experience utilizing Bootstrap for responsive user interface development. * Experience deploying and supporting solutions in Amazon Web Services (AWS). DESIRED SKILLS: * AWS certifications. * Experience integrating and unifying records from multiple data sources. * Experience developing applications that consume and integrate external APIs. * Experience supporting applications in a secure Intelligence Community environment. * Understanding of DevSecOps practices and CI/CD pipelines., * Bachelor's degree in Computer Science, Software Engineering, Information Systems, or a related technical discipline. Equivalent combinations of education, technical certifications, training, and experience will be considered. Experience * 6+ years of software development experience. * Experience supporting enterprise web applications in production environments. * Experience working within Agile software development teams. Clearance * Active TS/SCI with Polygraphrequired. * U.S. Citizenship required. ## Description At GDIT, people are our differentiator. As a Senior Software Engineer supporting our Intelligence Community customer, you will be trusted to solve complex technical challenges while delivering mission-critical capabilities that directly support national security objectives. We are seeking a highly motivated and experienced software engineer with an active TS/SCI clearance with Polygraph to join an Operations and Maintenance (O&M) team responsible for supporting enterprise applications used across the Intelligence Community. In this role, you will collaborate with Agile development teams to maintain, enhance, and improve applications serving a broad range of IC customers. Responsibilities include responding to user inquiries, troubleshooting and resolving issues, implementing system enhancements, and supporting the ongoing evolution of mission-focused applications. In addition to sustaining the current production environment, the successful candidate will play a key role in the modernization effort to develop and transition users to a next-generation application, while supporting the planned decommissioning of the legacy platform. This position offers a unique opportunity to contribute to both operational support and the future architecture of a critical IC mission system., * Provide Operations and Maintenance (O&M) support for mission-critical applications used by Intelligence Community customers. * Respond to user-reported issues and questions, troubleshoot problems, and implement solutions in a timely manner. * Design, develop, test, and deploy software enhancements and new capabilities. * Collaborate with stakeholders to gather requirements and translate business needs into technical solutions. * Participate in Agile ceremonies including sprint planning, daily standups, reviews, and retrospectives. * Maintain and improve application performance, reliability, and security. * Develop and maintain technical documentation and system artifacts for legacy system. * Support application integrations and data exchange with external systems and services. * Work closely with team members to continuously improve development, deployment, and support processes. * Support the lifecycle management of both legacy and modernized applications, ensuring continuity of operations throughout migration efforts. * Contribute to the design, development, testing, and deployment of a new application while maintaining and enhancing the existing production system. * Assist with planning and executing the decommissioning of legacy application components, services, and infrastructure.