Mid-Senior Full Stack Developer Chantilly, VA, US + 1 more

## Mid-Senior Full Stack DeveloperChantilly, VA, USApply NowFind out how well you match with this jobJob ID: 332287Job Title: Mid-Senior Full Stack DeveloperJob Category: EngineeringTime Type: Full timeMinimum Clearance Required to Start: TS/SCI with PolygraphEmployee Type: RegularPercentage of Travel Required: Up to 10%Type of Travel: Continental USAnticipated Posting End: 9/27/2027The Opportunity: As part of the Clairvoyant program, you will design and build the primary touchpoint between our platform and its customers — a sophisticated API layer and modern web UI delivering critical, real-time data to third-party partners.
As a Mid-Senior Full Stack Developer, you will operate within a hardened, AWS-based, Kubernetes-native environment where modern interface standards meet strict government security requirements. This is a high-visibility role where you will:
* Engineer the Interface: Build responsive web applications using React that visualize complex, real-time data sets for external customers.
* Architect the API Layer: Design and maintain RESTful or GraphQL APIs supporting seamless third-party integrations at scale.
* Secure the Stack: Implement OAuth2, OIDC, and mTLS protocols and ensure all code meets DISA STIG and OWASP standards.
* Own the Lifecycle: Drive the full SDLC from agile requirements through automated CI/CD deployment on Kubernetes.

Responsibilities:
* Design and maintain responsive front-end applications using React, handling complex data visualization and high-concurrency use cases for external partners.
* Build and maintain scalable RESTful and GraphQL APIs using Node.js, Python (FastAPI/Flask), or Java (Spring Boot) for third-party data access.
* Implement authentication and authorization patterns including OAuth2, OIDC, mTLS, and RBAC to ensure secure external data access.
* Design and optimize relational (PostgreSQL) and non-relational (Elasticsearch, Redis) data store interactions.
* Containerize applications with Docker and deploy to Kubernetes on AWS in coordination with the DevSecOps team.
* Ensure all code meets DISA STIG requirements and addresses the OWASP Top 10 throughout the development lifecycle.
* Integrate with GitLab CI/CD pipelines and Helm charts for deployment across environments.
* Conduct code reviews, provide technical guidance for junior developers, and serve as the SME for third-party API integration.
* Maintain technical documentation, API specifications, and integration guides.

Qualifications:
*Required: Current TS/SCI clearance with Polygraph.
* Bachelor’s degree in Computer Science or related field, or equivalent experience.
* 5+ years (mid-level) or 10+ years (senior-level) of full-stack software engineering experience.
* Advanced proficiency in JavaScript/TypeScript and React, including Redux and Context API.
* Strong experience building APIs with Node.js, Python (FastAPI/Flask), or Java (Spring Boot).
* Proficiency with Docker — writing Dockerfiles, building hardened images, and integrating with CI/CD pipelines.
* Familiarity with GitLab CI/CD, Helm, and Kubernetes deployment.
* Comfortable working in an agile, distributed team environment.
* Ability to travel up to 5%.*Desired: Experience with data visualization libraries such as D3.js or Recharts.
* Familiarity with GraphQL federation and advanced API design patterns.
* Experience with AWS services including ECS/EKS, API Gateway, CloudFront, and RDS.
* Working knowledge of OAuth2, OIDC, mTLS, and modern API security patterns.
* Knowledge of the OWASP Top 10 and STIG-compliant development practices.
* Exposure to Elasticsearch query optimization and index management at scale.
* Working knowledge of OAuth2, OIDC, mTLS, and modern API security patterns.
* Knowledge of the OWASP Top 10 and STIG-compliant development practices.
* Familiarity with RHEL 9 hardening and STIG compliance at the OS and container level.
* Relevant certifications: AWS Developer Associate, CKAD, or CompTIA Security+.-What You Can Expect:A culture of integrity.At CACI, we place character and innovation at the center of everything we do. As a valued team member, you’ll be part of a high-performing group dedicated to our customer’s missions and driven by a higher purpose – to ensure the safety of our nation.An environment of trust.CACI values the unique contributions that every employee brings to our company and our customers
- every day. You’ll have the autonomy to take the time you need through a unique flexible time off benefit and have access to robust learning resources to make your ambitions a reality.A focus on continuous growth.Together, we will advance our nation's most critical missions, build on our lengthy track record of business success, and find opportunities to break new ground — in your career and in our legacy.Pay Range:There are a host of factors that can influence final salary including, but not limited to, geographic location, Federal Government contract labor categories and contract wage rates, relevant