Software Development Engineer in Test (SDET) with Security Clearance

Location: Reston, VA We are seeking a mid-level Software Development Engineer in Test (SDET) to help build and mature the testing infrastructure supporting production software for simulation, optimization, and decision support in mission-focused environments. This role is for someone who can develop robust test harnesses, mocking infrastructure, and automated and manual testing strategies. A successful candidate will also help integrate testing into CI/CD pipelines and improve software quality and reliability across Java, Rust, and TypeScript-based applications.

The strongest candidates will bring solid software development fundamentals, hands-on experience with software testing and test infrastructure, and the technical judgment to build scalable, maintainable testing practices across a growing production codebase.

Required Qualifications • Bachelor’s degree in computer science, mathematics, physics, applied math, or related field • At least 3 years of industry experience • Experience building test infrastructure including mocking and CI/CD pipelines • Experience in software testing and test harness development • Experience designing automated and manual testing • Software Development experience in Java, Rust or Typescript/React • Ability to work effectively with researchers, engineers, and end users to translate technical concepts into usable software • Familiarity with full-stack web application development in any frameworks/languages • U.S.

CITIZENSHIP REQUIRED

• ACTIVE SECRET CLEARANCE Desired Qualifications • Active TS/SCI Security Clearance • Experience using ADO, Gitlab or similar CI/CD tools