Sr. QA Tester II Security Clearance

Senior Quality Assurance Tester – Cornerstone Defense

Cornerstone Defense is the Employer of Choice within the Intelligence, Defense, and Space communities of the U.S. Government. We focus on improving the overall work/life experience of employees while providing end-to-end solutions to combat our nation's toughest and most secure problems.

Cornerstone Defense offers a comprehensive list of benefits, designed to give employees and their families several options to choose from when selecting benefits that best fit their needs. These offerings include a full suite of traditional Medical/Dental/Vision insurances, a 401(K) plan with a company match, tuition and training assistance, paid vacation/leave, a fitness reimbursement program, life and AD&D insurance, employee assistance programs, and more.

• Perform comprehensive quality assurance testing for mission‑critical engineering and data systems deployed in a classified AWS IL6+ environment, ensuring compliance with security and performance standards.
• Collaborate with developers, analysts, and cloud engineers to validate data integrity, troubleshoot workflows, and confirm that solutions meet rigorous functional and security requirements.
• Design, develop, and execute test plans, scripts, and automation frameworks to verify software functionality, error handling, and system logic across complex data workflows.
• Prepare and manage synthetic or obfuscated data sets for testing purposes, ensuring accurate validation of system behavior while maintaining strict data security protocols.
• Identify, isolate, and document defects, track resolutions, and verify fixes to maintain high‑quality deliverables and operational reliability in classified environments.

• Bachelor’s degree ideally in an IT field or equivalent experience.
• Active TS/SCI + CI Poly clearance.
• 5+ years experience evaluating and executing testing procedures to ensure that software meets established quality standards.
• 5+ years experience developing and writing testing scripts, plans, and test automation to ensure that software functions as expected.
• 7+ years experience in IT.
• Strong experience preparing complex data sets to test logic, error handling, and system workflows, including experience generating synthetic data sets or obfuscating production data sets for use in testing.
• Strong experience isolating, reproducing, and tracking defects and verifying fixes.
• Extensive experience testing applications leveraging cloud services and deployed to classified AWS cloud environments at IL6+.
• Strong experience testing applications leveraging cloud services and deployed to classified AWS cloud environments at IL6+.

Mid‑Senior level

Full‑time

Quality Assurance

Information Services

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