Full Stack Software Developer

CACI International; Fairfax (VA); On-site; USD 94,000 - 198,000; Full time

Benefits offered by this job

Flexible time off

Learning resources

Healthcare benefits

Job summary

CACI International in Fairfax, VA is seeking a Full Stack Software Developer to design and implement scalable, secure web applications and investigative tools for the DHS Cyber Crimes Center. You will work with a cross-functional team applying modern full stack practices to support national security missions.

The role demands expertise in Python/JavaScript, RESTful APIs, React/Angular/Vue, Docker/Kubernetes, and secure coding.

Qualifications

• Bachelor’s degree in Computer Science, Software Engineering, or related technical field.
• 5+ years of full stack development producing production applications.
• 2+ years building dark web apps using Tor for secure communication.
• 4+ years frontend frameworks: React/Angular/Vue.js and strong JavaScript/TypeScript.
• 4+ years backend with Python, Node.js, or Java.
• Strong RESTful API design and microservices experience.
• Experience with PostgreSQL/MySQL and SQL optimization.
• Git and collaborative workflows; Docker and Kubernetes experience.
• Knowledge of software design patterns, data structures, and algorithms.
• Willing to work onsite in Fairfax, VA; U.S. citizenship with DHS background checks.

Responsibilities

• Design and implement complex web applications with frontend/backend expertise.
• Develop tools and sites to support DHS C3 investigations.
• Build applications using Tor for secure, anonymous communication.
• Create integrations with existing investigative systems and infrastructure.
• Develop RESTful APIs and microservices for data exchange.
• Write clean code in Python and JavaScript; implement responsive UIs using React/Angular/Vue.
• Develop server-side apps with Express.js/Django/Flask.
• Maintain and deploy via Docker, Git, and CI/CD pipelines.
• Design scalable database schemas; optimize performance.
• Integrate with existing systems through APIs and interfaces.
• Operate in anonymized/dark web environments with strong OPS security.
• Collaborate with data scientists, infra engineers, and cybersecurity specialists.
• Participate in code reviews, testing, QA; document architecture and APIs.
• Troubleshoot defects and performance; support SDLC from requirements to production.

Skills

Full stack development

Dark webTor

Frontend frameworks (React, Angular,/V

Backend development (Python/Node.js/JS

RESTful APIs & microservices

SQL databases (PostgreSQL/MySQL)

Git & CI/CD

Docker & Kubernetes

Web security & secure coding

Onsite in Fairfax

US Citizenship / DHS background

Onsite in Fairfax VA

AI/ML integration awareness

Education

Bachelor’s degree in Computer Science or related field

Master’s degree in Computer Science or related field

Tools

Git

CI/CD pipelines

Express.js/Django/Flask

Job description

Job Title: Full Stack Software Developer

Job Category: Engineering

Time Type: Full time

Minimum Clearance Required to Start: None

Employee Type: Regular

Percentage of Travel Required: Up to 25%

Type of Travel: Continental US

* * *

The Opportunity:

CACI is seeking a Full Stack Developer to support the Department of Homeland Security’s Cyber Crimes Center (C3) in designing and implementing sophisticated web applications and investigative tools. As the Full Stack Developer, you will design and develop scalable, secure applications that support critical law enforcement investigations targeting criminal networks and dark web operations,

You will work within a collaborative technical team delivering mission-critical software for national security operations applying modern full stack development practices to solve complex investigative challenges in anonymized environments.

Responsibilities:

• Design and implement complex web applications with advanced knowledge of frontend and backend technologies
• Develop and maintain custom applications, tools, and sites to support DHS C3 investigative operations
• Build applications using dark web technologies such as Tor for secure, anonymous communication
• Build custom solutions that integrate with existing investigative systems and infrastructure
• Develop RESTful APIs and microservices architecture to enable system integration and data exchange
• Write clean, maintainable code in Python and JavaScript for investigative software systems Implement responsive user interfaces using modern frameworks (React, Angular, or Vue.js)
• Develop server-side applications using frameworks such as Express.js, Django, or Flask
• Maintain and deploy code using Docker, version control (Git/GitHub), and CI/CD pipelines
• Design and optimize database schemas for performance and scalability
• Integrate applications with existing investigative systems through APIs and system interfaces
• Develop solutions that operate in anonymized and dark web environments while maintaining operational security
• Collaborate with data scientists, infrastructure engineers, and cybersecurity specialists on cross-functional projects
• Participate in code reviews, testing, and quality assurance processesDocument software architecture, APIs, and technical specificationsTroubleshoot and resolve software defects and performance issuesSupport software development lifecycle from requirements gathering through production deploymentEnsure applications meet federal security standards and compliance requirements

  Qualifications:

  Required:

  • Bachelor’s degree in Computer Science, Software Engineering, or related technical field
  • 5 or more years of demonstrated full stack development experience with a proven track record of delivering production applications
  • 2 or more years of experience developing dark web applications using technologies such as Tor for secure, anonymous communication
  • 4 or more years of experience in frontend frameworks (React, Angular, or Vue.js) with strong JavaScript/TypeScript skills
  • 4 or more years of experience in backend development experience with Python, Node.js, or Java
  • Strong understanding of RESTful API design and microservices architecture
  • Experience with relational databases (PostgreSQL, MySQL) and SQL query optimization
  • Proficiency with version control systems (Git) and collaborative development workflows
  • Experience maintaining and deploying applications using Docker and Kubernetes containerization
  • Strong understanding of software design patterns, data structures, and algorithms
  • Knowledge of web security best practices, secure coding principles, and anonymization technologies
  • Willing and able to work onsite in Fairfax, Va
  • Must be a U.S. Citizen with the ability to pass DHS background investigation, criteria include but are not limited to:
    • 3 year check for felony convictions
    • 1 year check for illegal drug use
    • 1 year check for misconduct such as theft or fraud

  Desired:

  • Master’s degree in Computer Science or related technical field

  • Experience integrating AI/ML models into web applications and building interfaces for AI-powered systems

  • Knowledge of machine learning frameworks (TensorFlow, PyTorch, scikit-learn) and AI model deployment

  • Excellent problem-solving and debugging skills

  • Strong communication skills with ability to collaborate effectively across technical teams

  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 prior work experience, specific skills and competencies, education, and certifications. Our employees value the flexibility at CACI that allows them to balance quality work and their personal lives. We offer competitive compensation, benefits and learning and development opportunities. Our broad and competitive mix of benefits options is designed to support and protect employees and their families. At CACI, you will receive comprehensive benefits such as; healthcare, wellness, financial, retirement, family support, continuing education, and time off benefits.

  The proposed salary range for this position is:

  $94,400 - $198,200

  CACI is anEqualOpportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, pregnancy, sexual orientation, age, national origin, disability, status as a protected veteran, or any otherprotectedcharacteristic.