Operating System Engineer Jobs in Denver, CO (NOW HIRING)

Job Title: Systems Engineer - Integration & Test
Job Category: Engineering
Time Type: Full time
Minimum Clearance Required to Start: TS/SCI
Employee Type: Regular
Percentage of Travel Required: Up to 10%
Type of Travel: Continental US
Anticipated Posting End: 12/31/2026
The Opportunity:
This position is for a Systems Engineer - Integration & Test in either Aurora, CO; King of Prussia, PA; or Colorado Springs, CO. You will be working closely with a talented team to deliver a complex software application into operations. You will play a critical role in the test and integration of software systems in an Agile software development context.
Responsibilities:
• Execute and maintain system-level integration and test procedures for agile software builds, including dry-runs, build verification testing, and run-for-record executions
• Perform software integration activities including environment setup, configuration management, interface verification, and troubleshooting of system-level issues
• Analyze test results to verify requirements compliance, identify defects, and collaborate with development teams on root-cause analysis and resolution
• Support Test Readiness Reviews (TRRs) and Test Review Boards (TRBs) by preparing test reports, documenting results, and presenting discrepancy analyses
• Develop and maintain integration and test documentation including test plans, test cases, interface specifications, and configuration procedures
• Collaborate with software developers, DevOps, and systems engineering teams to ensure testability, integration readiness, and requirements verification
• Support continuous integration/continuous testing (CI/CT) processes and participate in automation initiatives to improve test efficiency
• Follow established test processes, configuration management practices, and quality standards while recommending improvements to integration and test workflows
Qualifications:
Required:
• Active TS/SCI clearance
• Bachelor's degree in Systems Engineering, Computer Science, Software Engineering, or related engineering discipline
• Minimum 3+ years of systems engineering experience with at least 1-2 years in integration and test activities
• Demonstrated experience executing software integration and test procedures, including test planning, execution, data analysis, and results documentation
• Experience with configuration management, version control systems, and software build processes
• Proficiency with defect tracking and test management tools (e.g., Jira, Azure DevOps, TestRail, or similar)
• Experience analyzing test results, performing troubleshooting, and supporting root-cause analysis of system-level issues
• Knowledge of requirements management, traceability, and verification methods
• Strong collaboration and communication skills with ability to work effectively across software development, DevOps, and systems engineering teams
• Experience working in Agile/Scrum environments and familiarity with DevOps practices
• Ability to work independently and adapt quickly in fast-paced development environments
Desired:
• Experience with test automation frameworks and scripting languages (e.g., Python, Bash, PowerShell) for automated test development
• Proficiency with Linux operating systems and command line environments
• Experience with automated test and integration frameworks (e.g., Playwright, Selenium, PyTest, Robot Framework)
• Knowledge of networking fundamentals, protocols, and interface testing (TCP/IP, REST APIs, message buses)
• Experience troubleshooting complex, multi-component software systems and analyzing system-level integration issues
• Experience working with software-defined interfaces using XML, JSON, or similar data formats
• Familiarity with cloud architectures, containerization (Docker, Kubernetes), and virtualized test environments
• Experience with government testing processes including Site Acceptance Testing (SAT) procedures
• CompTIA Security+ certification or equivalent security certification (if DoD/cleared work)
• Experience with SysML and MBSE tools (e.g., Cameo Systems Modeler) for requirements and test traceability
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:
$69,100-$141,500
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.