Sr. QA Tester II

Senior Quality Assurance Tester

Tysons Corner, VA

Active TS/SCI with poly

Cornerstone Defense is the Employer of Choice within the Intelligence, Defense, and Space communities of the U.S. Government. Realizing early on that our most prized assets are our employees, we continually focus our attention on improving the overall work/life experience they have supporting the mission. Our Team is pushed every day to use their industry leading knowledge to provide end-to-end solutions to combat our nation’s toughest and most secure problems.

If you are looking for a place to not only be professionally challenged, but encouraged and supported by a company that cares, don’t look any further than Cornerstone Defense.

• 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
• 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+

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 not only a full suite of the traditional Medical/Dental/Vision insurances, but also a number of other benefits and perks to include, but not limited to: A 401(K) plan with a company match, tuition and training assistances, paid vacation/leave, a fitness reimbursement program, college savings plan, commuter benefits, financial advisory services, flex spending accounts, health savings accounts, STD/LTD coverage, life and AD&D insurance, employee assistance programs, life financial planning assistance, and legal resources.