Senior Full Stack Developer - Secure National Security Apps

CACI; Fairfax (VA); On-site; USD 94,400 - 198,200; Full time

Job summary

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, build custom solutions, and work within a collaborative technical team delivering mission-critical software for national security operations.

Qualifications

• Bachelor's degree in Computer Science, Software Engineering, or related technical field; 5+ years of full stack experience.
• Experience developing dark web applications using Tor for secure, anonymous communication.
• Advanced proficiency in frontend frameworks (React, Angular, or Vue.js) with strong JavaScript/TypeScript.
• 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 optimization.
• Proficiency with Git and collaborative development workflows.
• Experience maintaining and deploying applications using Docker and containerization.
• Knowledge of software design patterns, data structures, and algorithms.
• Knowledge of web security best practices and anonymization technologies.
• Excellent problem-solving and debugging skills; strong communication.
• Active Public Trust clearance or ability to obtain and maintain clearance.

Responsibilities

• Design and implement complex web applications with frontend and backend technologies.
• Develop and maintain custom applications and tools to support DHS C3 investigations.
• Build applications using dark web technologies such as Tor for secure, anonymous communication.
• Develop RESTful APIs and microservices 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 interfaces.
• Develop solutions that operate in anonymized and dark web environments while maintaining 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 SDLC from requirements gathering through production deployment.
• Ensure applications meet federal security standards and compliance requirements.

Skills

JavaScript

TypeScript

Python

Node.js

RESTful APIs

Web security

Problem solving

Communication

Public Trust clearance

Education

Bachelor's degree in Computer Science or related field

Master's degree in Computer Science (desired)

Tools

React

Angular

Vue.js

Express.js

Django

Flask

Docker

Git/GitHub

CI/CD

Tor/dark web tooling

Job description

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, build custom solutions, and work within a collaborative technical team delivering mission-critical software for national security operations.