Full-Stack Software Developer

Sphinx LLC; Springfield, Northern (VA, KY); Hybrid; USD 120,000 - 180,000; Full time

Job summary

Sphinx LLC is seeking a senior Full-Stack Software Developer to design, develop, and maintain mission-critical applications for internal teams and federal customers. You will work across front-end interfaces with React, Vite, and MUI, back-end services with Node/Express and PostgreSQL, and integrate shared tooling with TypeScript in both corporate and classified environments.

This role requires an active TS/SCI clearance with CI Poly, U.S.

Qualifications

• Active TS/SCI clearance with a current CI Polygraph (within the last 5 years)
• U.S. Citizenship (required for clearance eligibility)
• 8+ years of software development experience across the full stack
• AI-augmented development experience
• DevSecOps and CI/CD pipeline experience
• Secure coding experience (OWASP, NIST 800-53)

Responsibilities

• Design, develop, and maintain full-stack applications in corporate & classified environments
• Build responsive front ends (React, Vite, MUI), back-end services (Node, Express, PostgreSQL), and integrate shared tooling (TypeScript)
• 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

Skills

Full-stack development

AI-augmented development

DevSecOps

Secure coding

Zero Trust

CI/CD

Security standards

Education

BS in Computer Science or related field

Tools

React

Vite

MUI

Node

Express

PostgreSQL

TypeScript

Terraform

Ansible

Kubernetes

Job description

If you are unable to complete this application due to a disability, contact this employer to ask for an accommodation or an alternative application process.

Full-Stack Software Developer

Full Time Springfield, VA, US

Full-Stack Software Developer

Location: Remote / On-Site – Springfield, VA

Clearance Requirement: TS/SCI with CI Polygraph

Salary Range: Commensurate with experience

ABOUT THE ROLE

As a Full-Stack Software Developer you will design, develop, and maintain mission-critical applications supporting Sphinx internal development and federal customers. Activities will span front-end interfaces, back-end services, and data layers. This is hands-on development in a mix of corporate and classified environments, building secure and scalable tools that drive real mission outcomes.

WHAT YOU'LL DO

• Design, develop, and maintain full-stack applications in corporate & classified environments
• Build responsive front ends (React, Vite, MUI), back-end services (Node, Express, PostgreSQL), and integrate shared tooling (TypeScript)
• 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

REQUIRED QUALIFICATIONS

• Active TS/SCI clearance with a current CI Polygraph (within the last 5 years)
• U.S. Citizenship (required for clearance eligibility)
• 8+ years of software development experience across the full stack
• AI-augmented development experience
• DevSecOps and CI/CD pipeline experience
• Secure coding experience (OWASP, NIST 800-53)

PREFERRED QUALIFICATIONS

• Software development on Intelligence Community programs
• Iron Bank / DCAR hardened container experience
• Infrastructure as Code (Terraform, Ansible)
• Zero Trust architecture implementation (NIST 800-207)
• CISSP, Certified Kubernetes Security Specialist (CKS), or AWS Solutions Architect
• BS in Computer Science or a related field

ABOUT SPHINX

Sphinx is a mission-focused intelligence, counterintelligence, and cyber solutions firm founded in 2018 by professionals from the Special Operations, Intelligence, and Cyber Warfare communities. We partner with Defense, Intelligence, and Commercial clients to deliver exceptional personnel and transformative mission capabilities that advance complex, multi-domain intelligence and security missions. As a small business, Sphinx offers direct mission impact, technical leadership opportunities, and an operator-driven culture that larger companies cannot match.

WHAT SPHINX OFFERS

• Career Growth: Sphinx's Level-Up Employee Advancement and Performance (LEAP) Program provides structured career progression tied to technical certification achievement, mission performance, and leadership cultivation.
• Compensation: Market-benchmarked salary against the cleared workforce ecosystem with annual reviews calibrated to TS/SCI and CI/FSP market dynamics.
• Solution-Focused Culture: Sphinx prioritizes direct leadership access and promotes a Be-Know-Do culture where experienced professionals are empowered to propose and implement solutions that contribute directly high-consequence mission outcomes.

BENEFITS HIGHLIGHTS

We offer a competitive benefits package to include a 401K with corporate match, company paid health, vision, dental, disability, and other insurance options. Sphinx also offers a variety of incentives and opportunities to support the development and well-being of our personnel.

WHY Choose SPHINX?

Sphinx combines large business impact with small team collaboration. At Sphinx, we don't manage bureaucracy. We lead from a position of technical strength by delivering solutions that drive a measurable impact on every high-consequence mission we support.

Sphinx LLC is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability, or veteran status.