Full-Stack Software Developer (Contingent)

Sphinx LLC • Springfield, VA

16d • Onsite

About The Position

As a Full-Stack Software Developer you will design, develop, and maintain mission-critical applications supporting a federal counterintelligence customer — spanning front-end interfaces, back-end services, and data layers. This is hands-on engineering in a classified environment, building secure and scalable tools that drive real mission outcomes. Please note this position is contingent upon contract award. Start Date TBD.

Requirements

• Active TS/SCI clearance with a current CI Polygraph (within the last 5 years)
• U.S. Citizenship (required for clearance eligibility)
• BS in Computer Science or a related field
• 8+ years of software development experience across the full stack
• Docker / Kubernetes container orchestration
• DevSecOps and CI/CD pipeline experience
• Secure coding experience (OWASP, NIST 800-53)
• DoD 8140 compliance — CompTIA Security+ or equivalent

Nice To Haves

• Software development on Intelligence Community programs
• Iron Bank / DCAR hardened container experience
• Infrastructure as Code (Terraform, Ansible)
• Zero Trust architecture implementation (NIST 800-207)
• AI/ML integration into software platforms
• CISSP, Certified Kubernetes Security Specialist (CKS), or AWS Solutions Architect

Responsibilities

• Design, develop, and maintain full-stack applications in a classified environment
• Build responsive front ends (React, Angular, Vue) and back-end services (Python, Java), and integrate the two
• Deploy and manage containerized applications
• Build and maintain DevSecOps and CI/CD pipelines for secure continuous delivery
• Apply secure coding practices aligned to OWASP guidelines and NIST 800-53 controls
• Architect and implement Zero Trust network and application design
• Partner with program security officers, data engineers, and mission stakeholders to translate requirements into working software

Benefits

• 401K with corporate match
• Company paid health, vision, dental, disability, and other insurance options
• Variety of incentives and opportunities to support the development and well-being of our personnel

What This Job Offers

• Job Type: Full-time
• Career Level: Senior