Senior Fullstack Software Engineer Jobs in Denver, CO

Job Title: Full Stack Software Developer, Mid-level

Job Category: Engineering

Time Type: Full time

Minimum Clearance Required to Start: TS/SCI with Polygraph

Employee Type: Regular

Percentage of Travel Required: Up to 10%

Type of Travel: Local

Anticipated Posting End: 11/7/2026

The Opportunity:

We are seeking a skilled Full Stack Software Developer to join our team working on the Makalu contract. This role involves building and maintaining highly used and critically important cloud-native applications that provide Situational Awareness and Collaboration capabilities. The ideal candidate will have a strong background in Java and JavaScript development, along with experience in modern software development practices and cloud technologies. The role requires an active TS/SCI clearance and a commitment to maintaining the highest standards of security in all aspects of work.

Responsibilities:

• Design, develop, and maintain cloud-native applications using Java and JavaScript
• Build and enhance Situational Awareness and Collaboration capabilities for critical systems
• Collaborate with cross-functional teams in an Agile environment
• Implement and work with microservices architecture in cloud environments
• Contribute to the full software development lifecycle, from conception to deployment
• Ensure code quality through testing and code reviews
• Stay updated with the latest industry trends and cloud technologies
• Participate in Agile ceremonies and contribute to continuous improvement efforts

Qualifications:

Required:

• Proficiency in Java and JavaScript
• Experience developing in a Linux environment
• Either a Bachelor's degree in Computer Science, or graduation from an accredited coding bootcamp
• Must possess an active Top Secret/Sensitive Compartmented Information (TS/SCI) clearance and polygraph preferred
• 5+ years of professional software development experience
• Must have or be willing to obtain Security+ certification
• Strong knowledge of Java and JavaScript programming languages
• Experience with software development best practices and methodologies
• Demonstrated ability to lead technical initiatives and mentor junior developers
• Strong system design and architecture skills

Desired:

• Experience leading development teams in Agile environments
• Track record of successful delivery of complex, mission-critical applications
• Experience with Kubernetes or other containerized environment
• Knowledge of Elasticsearch
• Familiarity with Java Spring Boot framework
• Understanding of microservice architecture
• Experience with Agile development methodologies
• AWS developer experience
• Knowledge of WebSocket's
• Experience with RESTful API design and implementation
• Security+ certification (or willingness to obtain within a specified timeframe)

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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.

Since this position can be worked in more than one location, the range shown is the national average for the position.

The proposed salary range for this position is:

$82,100-$172,400

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.