Senior Software Engineer - TS/SCI with Polygraph

Type of Requisition:

Regular

Clearance Level Must Currently Possess:

Top Secret SCI + Polygraph

Clearance Level Must Be Able to Obtain:

None

Public Trust/Other Required:

None

Job Family:

Software Engineering

Job Qualifications:

Skills:

Complex Systems, Software Design, Software Development

Certifications:

None

Experience:

6 + years of related experience

US Citizenship Required:

Yes

Job 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.

HOW A SENIOR SOFTWARE ENGINEER WILL MAKE AN IMPACT:

• 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.
  

REQUIRED SKILLS AND EXPERIENCE:

• 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.

WHAT YOU'LL NEED TO SUCCEED:

Education

• 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 Polygraph required.
• U.S. Citizenship required.

Location

• Chantilly, VA or McLean, VA
• On customer site

GDIT IS YOUR PLACE:

• 401K with company match
• Comprehensive health and wellness packages
• Internal mobility team dedicated to helping you own your career
• Professional growth opportunities including paid education and certifications
• Cutting-edge technology you can learn from
• Rest and recharge with paid vacation and holidays

#WeAreGDIT

#JET

#GDITEnhanced2026

#VA_2026Alumni

The likely salary range for this position is $141,100 - $190,900. This is not, however, a guarantee of compensation or salary. Rather, salary will be set based on experience, geographic location and possibly contractual requirements and could fall outside of this range.

Scheduled Weekly Hours:

40

Travel Required:

Less than 10%

Telecommuting Options:

Onsite

Work Location:

USA VA Chantilly

Additional Work Locations:

USA VA McLean

Total Rewards at GDIT:

Our benefits package for all US-based employees includes a variety of medical plan options, some with Health Savings Accounts, dental plan options, a vision plan, and a 401(k) plan offering the ability to contribute both pre and post-tax dollars up to the IRS annual limits and receive a company match. To encourage work/life balance, GDIT offers employees full flex work weeks where possible and a variety of paid time off plans, including vacation, sick and personal time, holidays, paid parental, military, bereavement and jury duty leave. To ensure our employees are able to protect their income, other offerings such as short and long-term disability benefits, life, accidental death and dismemberment, personal accident, critical illness and business travel and accident insurance are provided or available. We regularly review our Total Rewards package to ensure our offerings are competitive and reflect what our employees have told us they value most.

Our Identity Verification Process:

As part of the hiring process, we will ask you to complete an identity verification process that leverages advanced biometrics and artificial intelligence to ensure authenticity and protect against identity fraud. You are expected to be on camera during virtual interviews. We reserve the right to take your picture to verify your identity and prevent fraud. By proceeding, you authorize the collection, processing, and use of your biometric data for identity verification and security purposes.

About Our Work:

We are GDIT. A global technology and professional services company that delivers technology solutions and mission services to every major agency across the U.S. government, defense and intelligence community. Our 26,000 experts extract the power of technology to create immediate value and deliver solutions at the edge of innovation. We operate across 50+ countries worldwide, offering leading mission-ready capabilities in AI, cloud, cyber and software development.Join our Talent Community to stay up to date on our career opportunities and events at

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Equal Opportunity Employer / Individuals with Disabilities / Protected Veterans