Software Development Engineer in TEST (SDET)

Henpen Corporation; Reston (VA); On-site; USD 90,000 - 120,000; Full time

Job summary

Henpen Corporation in Reston, VA is seeking a mid-level Software Development Engineer in Test (SDET) to build testing infrastructure for simulation, optimization, and decision support in mission-focused environments.

You will develop robust test harnesses, mocking, and automated and manual testing strategies, integrate testing into CI/CD, and improve software quality and reliability across Java, Rust, and TypeScript/React applications, collaborating with researchers and engineers.

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.

Responsibilities

• Help build and mature testing infrastructure supporting production software for simulation, optimization, and decision support in mission-focused environments.
• Integrate testing into CI/CD pipelines to improve software quality and reliability.
• Develop robust test harnesses and mocking infrastructure; design automated and manual testing strategies.
• Collaborate with researchers, engineers, and end users to translate technical concepts into usable software.
• Contribute to scalable, maintainable testing practices across a growing production codebase.

Skills

Software testing

Test infrastructure

CI/CD pipelines

Full-stack development

Education

Bachelor's degree in computer science or related field

Tools

Java

Rust

TypeScript/React

Job description

Software Development Engineer in Test (SDET)

• Reston, VA
• Government/Military

Location: Reston, VA
Security Clearance: SECRET

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