Systems Test Engineer - TS/SCI with CI Polygraph

Modern Government Solutions-posted 10 days ago
Full-time • Mid Level
Onsite • Sterling, VA
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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.

  • 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.
  • Must possess an a ctive 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 I ntelligence C ommunity (IC) programs.
  • Experience running test programs with in 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).
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