Freelance Frontend Javascript Developer Jobs in Colorado

Job Title: Front-end Software Developer Job Category: Engineering Time Type: Full time Minimum Clearance Required to Start: TS/SCI with Polygraph Employee Type: Regular Percentage of Travel Required: None Type of Travel: None Anticipated Posting End: 10/31/2026 The Opportunity: We are looking for a Senior Front-End Software Developer on the FADE program to build mission-critical, cloud and edge-native applications with advanced situational awareness and collaboration features. Responsibilities: * Develop modern, responsive user interfaces using JavaScript, TypeScript, and related front-end frameworks
* Balance maintenance of a large, legacy codebase and implementation of new requirements using contemporary web technologies
* Create intuitive applications that handle large data sets and real-time information updates
* Engage with stakeholders and operations team to ensure high quality product development and use case satisfaction
* Integrate front-end applications with RESTful APIs, WebSocket services, and distributed backend systems
* Collaborate with backend engineers and architects to leverage event-driven architectures
* Optimize application performance and scalability
* Participate in architecture discussions and code reviews
* Mentor junior developers and contribute to team growth
* Engage in Agile ceremonies and continuous improvement initiatives Qualifications: Required: * Hold a current TS/SCI clearance and polygraph preferred
* Minimum of 5+ years of front-end development experience
* Bachelor's degree in computer science or related field; or equivalent experience
* Advanced proficiency in JavaScript and TypeScript
* Experience with modern web application development tools
* Strong understanding of asynchronous programming and distributed systems
* Demonstrated leadership and mentoring skills Desired: * Experience with Svelte or other modern front-end frameworks
* Familiarity with WebSockets, Kafka, and event-driven architectures
* Possess or be willing to obtain a CompTIA Security+ certification
* Experience in secure government environments - 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: $90,300 - 189,600 USD CACI is an Equal Opportunity 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 other protected characteristic.