Software Development Engineer in Test

K2 is building the largest and highest-power satellites ever flown, unlocking performance levels previously out of reach across every orbit. Backed by $450M from leading investors including Altimeter Capital, Redpoint Ventures, T. Rowe Price, Lightspeed Venture Partners, Alpine Space Ventures, and others – with an additional $500M in signed contracts across commercial and US government customers – we’re mass-producing the highest-power satellite platforms ever built for missions from LEO to deep space.

The rise of heavy-lift launch vehicles is shifting the industry from an era of mass constraint to one of mass abundance, and we believe this new era demands a fundamentally different class of spacecraft. Engineered to survive the harshest radiation environments and to fully capitalize on today’s and tomorrow’s massive rockets, K2 satellites deliver unmatched capability at constellation scale and across multiple orbits. With multiple launches planned through 2026 and 2027, we're Building Bigger to develop the solar system and become a Kardashev Type II (K2) civilization.

If you are a motivated individual who thrives in a fast-paced environment and you're excited about contributing to the success of a groundbreaking Series C space startup, we’d love for you to apply. The Role The software team at K2 builds software across the stack, from gateware micro firmware to high level satellite control to Ground Software and all the associated testing, and we’re looking for an SDET who shares our belief that test infrastructure is a first-class engineering discipline. You will be embedded directly within the flight software team, working shoulder-to-shoulder with the engineers writing the code that flies our spacecraft owning the automation frameworks, test tooling, and HIL infrastructure that make rapid, confident software deployment possible.

This role is not a QA function. You will be a builder. In your first 6 months, you will design and ship core test automation frameworks and integrate them into our CI/CD pipelines.

In your first year, you will own end-to-end test coverage across multiple spacecraft subsystems and lead HIL testing campaigns alongside flight software engineers, proving the software is ready to go to space. In your first two years, you will have operated your test systems against hardware that has been launched to orbit.

Responsibilities

Design, develop, and own software test frameworks targeting K2’s flight software stack, including subsystems for propulsion, GNC, power, thermal, and communications Build and maintain automation tooling that integrates seamlessly into CI/CD pipelines, enabling fast and reliable flight software deployment Develop hardware-in-the-loop (HIL) and software-in-the-loop (SIL) test infrastructure in close collaboration with flight software engineers Create tooling for test execution, data collection, and anomaly triage that gives engineers clear, actionable signal Reduce flaky and nondeterministic tests; continuously improve coverage, pipeline reliability, and test execution speed Collaborate with flight software, avionics, and systems engineers to define test

Requirements

, write test plans, and execute verification campaigns Analyze test results to identify and characterize failures, and drive resolution across the team Maintain documentation for test infrastructure, procedures, and hardware configurations

Qualifications

Bachelor’s degree in Computer Science, Computer Engineering, Electrical Engineering, Aerospace Engineering, or a related STEM field, or equivalent professional experience Experience building and maintaining test automation frameworks, not just executing tests written by others Experience with CI/CD systems (e.g., GitLab Pipelines, GitHub Actions, Jenkins) and version control (Git)

Nice To Have

Experience with hardware-in-the-loop (HIL) testbeds or embedded systems testing Experience testing avionics, spacecraft, robotics, autonomous vehicles, or other safety-critical hardware