Software Developer (Principal/Expert) - TS/SCI with Polygraph Required
Catalyst Operations & Analytics
Job Description
Job Description
Position Summary
Principal/Expert Software Developers provide technical leadership across the design, architecture, and delivery of the most complex, mission-critical application systems in support of the customer's requirements, including modernization efforts that transition legacy systems to next-generation architectures. Principal/Expert Software Developers own major technical decisions across the full stack, evaluate cross-system design trade-offs, and set engineering direction across Agile development teams. Principal/Expert Software Developers are expected to mentor Senior, Mid-Level, and Associate developers, represent technical solutions directly to the customer, and drive the adoption of sound engineering practices across the program.
Requirements
US Citizenships and TS/SCI with Polygraph (no exceptions)
Education/Experience Requirements:
- Bachelor's degree and 12+ years of relevant professional software development experience (Master's degree and 10+ years also acceptable); additional relevant experience may be considered in lieu of a degree
Required Skills:
- Expert-level proficiency in one or more modern programming languages (e.g., Java, JavaScript, Python)
- Extensive experience across the full stack, including web application UI development, back-end services, databases, and system integration
- Extensive experience designing and building RESTful APIs and microservices architectures
- Deep experience with cloud platforms and containerization/orchestration technologies (e.g., AWS, Docker, Kubernetes)
- Demonstrated experience leading Agile/Scrum development teams
- Extensive experience with DevOps practices and CI/CD pipelines
- Demonstrated ability to translate customer and system requirements into enterprise-level technical design, including migration of legacy systems to modern architectures
- Excellent critical thinking, technical writing, and oral communication skills, including the ability to present and defend technical solutions to customers and senior stakeholders
- Principal/Expert positions set technical direction for the program and mentor Senior, Mid-Level, and Junior developers
$210k - $260k
...0 Position Summary Principal/Expert Software Engineers provide technical... ...of the customer's requirements. Principal/Expert Software... ...US Citizenships and TS/SCI with Polygraph (no exceptions) Education... ...tools Deep experience developing on Windows and/or Linux...Principal- ...Description Position Summary Senior Software Developers lead the design, development, and... ...in support of the customer's requirements. Senior Software Developers translate... ...Requirements US Citizenships and TS/SCI with Polygraph (no exceptions) Education/Experience...Suggested
- ...into opportunity as a Full Stack Developer at GDIT. Shape what’s next for... ...years of related experience Required Skills & Experience: Experience with Java and Python. Build and... ...Security Clearance Level: TS/SCI with Polygraph Location: McLean VA, on Customer...SuggestedWork experience placement
$186.54k - $252.38k
...Top Secret SCI + Polygraph Clearance Level... ...Public Trust/Other Required: None Job Family: Software Engineering... ...as a Full Stack Developer at GDIT. Shape... ...Experience with Java and Python... ...Clearance Level: TS/SCI with Polygraph... .... Our 26,000 experts extract the power...SuggestedFull timeTemporary workPart timeWork experience placementImmediate startRemote workWorldwideFlexible hours- ...complex problems as a Front End Software Developer at GDIT. Here, you’ll tailor cutting... ...-edge solutions to the unique requirements of our clients. With a career in development, you’ll... .... Security Clearance Level: TS/SCI with Polygraph Location: McLean VA, on...SuggestedWork experience placement
$124.09k - $166.75k
...faceted Cyber Analyst Principal for a critical... ...systems. This position requires the employee to report... ...seasoned professional with extensive, hands‑on experience... ...a current and active TS/SCI with Polygraph. Certifications:... ...in McLean, VA. Expert‑level knowledge of the...PrincipalFull timeContract workTemporary workFlexible hours- ...Description Position Summary Expert/Lead Systems Integrators lead and... ...Integrators are expected to operate with substantial latitude for... ...technical direction of the program. Requirements US Citizenships and TS/SCI with Polygraph (no exceptions) Education/...
$148.3k - $266.9k
...possibilities, pursue one with endless... ...searching for a full-time Principal Software Developer position at our Herndon... ...customer requirements, to design, development... ...structures, and algorithmsTS/SCI is requiredMinimum... ...ThreadingAn active TS/SCI w/polygraph is preferredSecurity...PrincipalFull timePart time$145k - $175k
...Position Summary Mid-Level Software Developers support the design,... ...support of the customer's requirements, working both individually... ...Developers are expected to work with growing independence... ...Requirements US Citizenships and TS/SCI with Polygraph (no exceptions)...- ...Position Summary Mid-Level Software Developers support the design,... ...support of the customer's requirements, working both individually... ...Developers are expected to work with growing independence... ...Requirements US Citizenships and TS/SCI with Polygraph (no exceptions)...
$110k - $145k
...Position Summary Junior Software Developers support the design,... ...support of the customer's requirements, working as members of an... ...integration of application features with existing systems. Junior... ...US Citizenships and TS/SCI with Polygraph (no exceptions) Education...Internship- ...problems as a Full Stack Java Developer at GDIT. Here, you’ll... ...solutions to the unique requirements of our clients. With a career in application... .... Our work depends on Software Developer joining our team... ...Clearance Level: TS/SCI with Polygraph Location: Herndon, VA...
$195k - $235k
...$235,000 Position Summary Principal/Lead Network Engineers provide technical... ...directly to the customer. Requirements US Citizenships and TS/SCI with Polygraph (no exceptions) Education/... ...Required Skills: Expert-level experience architecting and...Principal- ...Description AI/ML Engineer McLean, VA Active TS/SCI with Poly Clearance required @Orchard is retained by a top geospatial... ...Clearance at the TS/SCI level with required Polygraph. Responsibilities: Develop, implement, and maintain AI/ML-enabled applications...Full time
- ...meet critical mission requirements in the areas of Data Analytics and Software Development, Engineering... ...reliable partnerships with our customers and... ...Geospatial Analyst/Software Developer, a typical day will... ...requires an active/current TS/SCI with Polygraph clearance. Equal...Full time
- ...Position Summary Senior Software Engineers lead the design,... ...support of the customer's requirements. Senior Software Engineers... ...US Citizenships and TS/SCI with Polygraph (no exceptions) Education... ...management tools Experience developing on Windows and/or Linux...
- ...capable of working with a software development team to... ...AWS Platform. At the expert level the candidate... ...on to others. REQUIRED SKILLS: Experience... ...deliverables Experience developing and maintaining high... ...Clearance Level: TS/SCI with Polygraph Work...Work experience placement
- ...personal impact as a Full Stack Software Developer, supporting customer... ...capabilities provide the client with necessary timeliness,... ...related discipline) Required Experience : 5+ yrs Required... ...Clearance Level : TS/SCI with active polygraph Desired Skills: AWS...
- ...And our work depends on a Software Applications Tester... ...highly cleared candidates with active TS SCI w/ Poly to provide software... ...range of IC customers. Required Skills: Develops and implements quality... ...Level: Top Secret/SCI with Polygraph US Citizenship Required...Work experience placement
$140.82k - $190.52k
...Possess: Top Secret SCI + Polygraph Clearance... ...Trust/Other Required: None Job Family: Software Engineering Job... ...cleared candidates with active TS SCI w/ Poly to provide... ...Skills: Develops and implements quality... .... Our 26,000 experts extract the power...Full timeTemporary workPart timeWork experience placementImmediate startRemote workWorldwideFlexible hours$43.27 - $108.17 per hour
...Description: This is a forensic software development and reverse... ...existing software and develop new software to customer specifications... ...of our open positions require an aptitude in both domains... ...security clearance at the TS//SCI level with Polygraph Must have a Bachelors...Hourly payContract workFor contractorsLocal areaRemote workRelocation packageFlexible hours- ...Position Summary Junior Software Engineers support the... ...support of the customer's requirements, working as members of an... ...Requirements US Citizenships and TS/SCI with Polygraph (no exceptions)... ...control tools Comfort developing on Windows and/or Linux operating...Internship
$187k - $253k
...Top Secret SCI + Polygraph Clearance Level... ...Trust/Other Required: None Job... ...provide the client with necessary... ...in iterative software development teams... ...Experience in developing enterprise and... ...Level : TS/SCI with active... ...community. Our 30,000 experts extract the...Temporary workImmediate startRemote workWorldwideFlexible hours- ...technology into opportunity as a Software Developer at GDIT. Shape what’s next... ...systems Collaborate with customer and mission... ...to define next generation requirements and the art of the possible... ...Security clearance level: TS/SCI with Polygraph Location: Herndon, VA...
- ...system-of-systems environments in support of the customer's requirements. Senior Systems Integrators perform horizontal integration... ...stakeholders. Requirements US Citizenships and TS/SCI with Polygraph (no exceptions) Education/Experience Requirements:...Contract work
- ...DEVOPS ENGINEER PRINCIPAL Transform technology... .... ● Collaborate with a highly-skilled,... ...clearance level: TS/SCI w/Polygraph ● US citizenship required AWS Certified... ...understanding of software/application development... ...AWS Certified Developer - Associate | Amazon...
- ...hands-on DevOps Engineer (SME) with deep experience across... ...premise environments. This role requires a proven practitioner who... ...Architecture & Design: ~ Develop detailed engineering designs... ...Security Clearance Level: TS/SCI with Polygraph Location: Herndon, VA...Work experience placement
- ...impact as a Java/ETL Developer supporting customer activities... ...provide the client with necessary timeliness,... ...environment that requires experience with the... ...complex hardware/software compatibility and interface... ...building skills ~ TS/SCI with Polygraph clearance ~...
- ...solutions in support of the customer's requirements, working as members of a program team... ...Development Life Cycle (SDLC), assist with requirements triage and traceability,... ...Requirements US Citizenships and TS/SCI with Polygraph (no exceptions) Education/Experience...Work at office
- ...systems (both LLMs and other technologies) with external systems, including data... ...customer site Security Clearance Level: TS/SCI with Polygraph #WeAreGDIT #JET #GDITEnhanced2026 #VA_2026Alumni Work Requirements Years of Experience 15 + years of related...Work experience placement
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