Systems Test Engineer - TS/SCI with CI Polygraph at Modern Government Solutions (MGS) in Sterling, VA, USA

Job description

• Modern Government Solutions (MGS) is seeking a Systems Test Engineer to plan, execute, and validate the performance, reliability, and security of mission-critical systems supporting national security operations. The ideal candidate combines strong analytical skills with hands-on experience developing and executing comprehensive test strategies across complex, integrated environments to ensure systems meet rigorous mission and accreditation requirements.

Responsibilities

• Develop and execute test plans, procedures, and cases for system validation and verification in cloud-based classified information systems.
• Evaluate system performance, functionality, and interoperability across hardware, software, and network components.
• Collaborate with systems engineers, developers, and security teams to define test objectives and acceptance criteria.
• Conduct integration, regression, and performance testing to identify and resolve defects early in the lifecycle.
• Support test environment setup, configuration, and data preparation.
• Document test results, anomalies, and recommendations in support of engineering and accreditation processes.
• Participate in technical reviews, readiness assessments, and system acceptance testing.
• Provide feedback to engineering teams on design improvements and operational risks.
• Maintain traceability between requirements, test cases, and results to ensure comprehensive coverage.
• Support automation of test processes where feasible to improve efficiency and repeatability.

Requirements

• Must possess an active Department of Defense (DoD) TS/SCI with CI Polygraph security clearance.
• Bachelor's degree in Engineering, Computer Science, or related field (or equivalent experience).
• Professional certifications such as ISTQB, CompTIA Security+, or equivalent.
• AWS certifications (e.g., AWS Certified Solutions Architect, SysOps Administrator, or Developer).
• 7+ years of experience in systems testing, integration, or verification within enterprise or mission environments.
• Proven experience developing and executing test plans, procedures, and reports for complex systems.
• Experience supporting system accreditation, validation, or certification efforts.
• Experience consolidating and managing test results in ServiceNow or comparable ITSM/test management platforms.
• Strong understanding of systems engineering principles, including requirements analysis and verification.
• Familiarity with test management tools, scripting, or automation frameworks.
• Familiarity with testing and validating systems within CI/CD pipelines to support automated deployment and verification.
• Familiarity with cross-domain infrastructure and testing environments supporting data transfer between security domains.
• Ability to analyze results, identify root causes, and communicate findings to technical and non-technical audiences.
• Experience using testing and automation tools such as Selenium, JMeter, Postman, PyTest, or Robot Framework for system and integration testing.
• Experience supporting defense or Intelligence Community (IC) programs.
• Experience running test programs within continuous integration and DevSecOps environments.
• Working knowledge of system monitoring and performance metrics.
• Experience with setting up, running and reporting in virtualized or cloud-based test environments.
• Knowledge of requirements management tools (e.g., DOORS, JIRA, or equivalent).
• *Applicants selected will be United States citizens and may be subject to a government security investigation for access to classified information.*

Skills

Required

• Strong analytical skills
• Systems testing and integration
• Test plan development and execution
• CI/CD pipelines
• Cross-domain infrastructure
• DevSecOps environments