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Full Stack Engineer - Senior

The Arena

Yesterday
Top Secret/SCI
Mid Level Career (5+ yrs experience)
$140,000 - $180,000
No Traveling
CI Polygraph
Intelligence
Washingtn, DC (On-Site/Office)

Full Stack Engineer – Senior

Location: Onsite | Washington, DC
Clearance: Active TS/SCI with CI Polygraph
Employment Type: Full-time, salaried, with full benefits
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About the Company:

Our customer is a mission-driven technology company transforming how the U.S. defense and intelligence community leverages artificial intelligence. The company integrates cutting-edge AI, next-generation sensors, and advanced data solutions into operational environments—delivering capabilities that matter at the speed of mission.

The team is built from seasoned operators, technologists, and problem-solvers who thrive in small, fast-moving groups. They are deeply connected to the mission, move with urgency, and empower their people to take ownership. The problems they tackle are complex and high impact: accelerating decision-making, enhancing warfighter effectiveness, and shaping the future of defense technology.
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About the Role:

This role involves end-to-end ownership of web-based solutions—from intuitive front-end interfaces to robust back-end services and secure data infrastructure—within classified environments supporting national security operations.
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Primary Responsibilities:

• Architect, build, and maintain full stack applications for secure cloud and on-premises deployments across Client’s mission systems.
• Develop performant front-end experiences using React, Tailwind CSS, and TypeScript.
• Build and secure server-side logic using Node.js and Python; implement authentication, authorization, and input validation.
• Design and manage robust, scalable relational databases (PostgreSQL, MySQL); write advanced SQL queries and optimize performance.
• Develop CI/CD pipelines for deploying to air-gapped, Secret, and Top Secret environments.
• Interface with Client’s analysts, operators, and mission stakeholders to understand operational requirements and translate them into technical implementations.
• Collaborate with security engineers to maintain accreditation compliance and ensure system integrity across classification levels.
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Required Experience:

• Active TS/SCI clearance with CI Polygraph.
• 5+ years of experience in full stack development, with strong contributions across both frontend and backend systems.
• Strong proficiency in:
o Frontend: TypeScript, React/Next.js, Tailwind CSS, SSR, state management
(Zustand, Redux, etc.) o Backend: Node.js, Python (with mypy), RESTful APIs, OAuth/JWT
o Database: PostgreSQL/MySQL, schema design, migrations, stored procedures, query optimization
o DevOps: Docker, GitHub Actions/GitLab Pipelines, semantic versioning, feature flags, AWS
• Experience writing tests (unit and integration), using tools like Vitest or Jest.
• Familiarity with secure software development in government or DoD environments.
• Strong communication skills with the ability to bridge mission context and technical execution.
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Preferred Experience:

• Experience working in classified environments (Secret/TS/TS/SCI) and familiarity with ATO processes.
• Knowledge of Kafka/RedPanda or experience with streaming data systems.
• Familiarity with infrastructure-as-code tools like Pulumi or Terraform.
• Contributions to open-source projects or a public GitHub showcasing your development style and quality.
• Experience deploying software in edge environments or disconnected networks.
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Benefits:

• Equity participation
• 401(k) retirement plan
• Unlimited paid time off (PTO)
• Paid parental leave
• Paid holidays
• Comprehensive medical, dental, vision, and life insurance
• Short- and long-term disability coverage
group id: 91164143
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Job Category
Intelligence
Clearance Level
Top Secret/SCI
Employer
The Arena