Full Stack Developer

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

Job summary

CACI is seeking a Senior Full Stack Developer to support the Department of Homeland Security’s Cyber Crimes Center (C3). You will design and implement scalable web applications and investigative tools, build custom solutions, and work within a collaborative team delivering mission-critical software for national security operations.

The role requires U.S. citizenship and eligibility for a DHS Public Trust clearance; you will develop using Python/JavaScript, work with dark web tech, and deploy via

Qualifications

• Bachelor’s degree in Computer Science, Software Engineering, or related technical field; 5+ years of full stack production experience
• Experience developing dark web applications using Tor for secure, anonymous communication
• Advanced proficiency in frontend frameworks (React/Angular/Vue) with strong JavaScript/TypeScript skills
• Expert backend development with Python, Node.js, or Java
• Strong understanding of RESTful API design and microservices
• Experience with relational databases (PostgreSQL, MySQL) and SQL optimization
• Proficiency with Git and collaborative workflows
• Experience with Docker and containerization
• Knowledge of security best practices, anonymization technologies
• Excellent problem-solving and communication skills
• Active Public Trust clearance or ability to obtain and maintain clearance
• Desire to integrate AI/ML models and frameworks

Responsibilities

• Design and implement complex web applications with frontend and backend tech
• Develop and maintain custom applications and tools to support DHS C3 investigations
• Build applications using dark web technologies for secure communications
• Develop RESTful APIs and microservices for system integration
• Write clean code in Python and JavaScript; implement modern UI with React/Angular/Vue
• Develop server-side apps with Express.js, Django, or Flask
• Maintain and deploy via Docker, Git, CI/CD pipelines
• Design and optimize scalable database schemas
• Integrate apps with existing systems through APIs
• Develop solutions for anonymized/dark web environments while ensuring OSS
• Collaborate with data scientists, infra engineers, and security specialists
• Participate in code reviews, testing, and QA
• Document architecture, APIs, and specs
• Troubleshoot and resolve defects and performance issues
• Support SDLC from requirements to production
• Ensure compliance with federal security standards

Skills

Full stack development

Dark web apps

JavaScript/TypeScript

Python

RESTful APIs

Microservices

Problem solving

Communication skills

Education

Bachelor’s degree in Computer Science, Software Engineering, or related field

Master’s degree preferred

Tools

Docker

Git

CI/CD

Express.js

Django

Flask

React

Angular

Vue.js

Tor

PostgreSQL

MySQL

Job description

Job Title: Full Stack Developer

Job Category: Engineering

Time Type: Full time

Minimum Clearance Required to Start: Public Trust

Employee Type: Regular

Percentage of Travel Required: Up to 10%

Type of Travel: Continental US

* * *

The Opportunity:

CACI is seeking a Senior 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. In this role, you will:

• Design and develop scalable, secure applications that support critical law enforcement investigations targeting criminal networks and dark web operations
• Build custom solutions that integrate with existing investigative systems and infrastructure
• Work within a collaborative technical team delivering mission-critical software for national security operations
• Apply modern full stack development practices to solve complex investigative challenges in anonymized environments

This position requires U.S. citizenship and eligibility to obtain a DHS Public Trust clearance.

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
• 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 processes
• Document software architecture, APIs, and technical specifications
• Troubleshoot and resolve software defects and performance issues
• Support software development lifecycle from requirements gathering through production deployment
• Ensure applications meet federal security standards and compliance requirements

Qualifications:

Required:

• Bachelor’s degree in Computer Science, Software Engineering, or related technical field 5+ years of demonstrated full stack development experience with a proven track record of delivering production applications
• Experience developing dark web applications using technologies such as Tor for secure, anonymous communication
• Advanced proficiency in frontend frameworks (React, Angular, or Vue.js) with strong JavaScript/TypeScript skills
• Expert-level 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 containerization
• Strong understanding of software design patterns, data structures, and algorithms
• Knowledge of web security best practices, secure coding principles, and anonymization technologies
• Excellent problem-solving and debugging skills
• Strong communication skills with ability to collaborate effectively across technical teams
• Active Public Trust clearance or ability to obtain and maintain clearance

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
• Experience developing applications that consume AI APIs or incorporate generative AI capabilities
• Understanding of AI/ML workflows, model serving, and inference optimization

This position is contingent on funding and may not be filled immediately. However, this position is representative of positions within CACI that are consistently available. Individuals who apply may also be considered for other positions at CACI.

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.

$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.