Software Test Engineer

Software Test Engineer

Cimarron is seeking Software Test Engineers to support the verification, validation, and integration of software for the Axiom Space Commercial Space Station in Houston, TX. In this role, you will focus on software verification testing, hardware/software integration, and system-level test activities to ensure flight‑critical software performs reliably in prototype, simulation, and flight environments. The selected candidates will play a key role in supporting commercial human spaceflight modules through rigorous test execution and analysis.

• Plan, develop, execute, and document software verification and validation test procedures for flight and ground software systems.
• Perform hardware/software integration testing across systems such as propulsion, command & data handling (C&DH), environmental control and life support systems (ECLSS), guidance, navigation and control (GN&C), caution and warning (C&W), power, networks, and datalinks.
• Support software test activities in prototype, simulation, and flight environments, including anomaly identification, troubleshooting, and resolution support.
• Collaborate closely with software developers, systems engineers, and subject matter experts throughout the software test lifecycle.
• Support configuration control and disciplined test documentation, reporting, and traceability.

• Due to facility security requirements, only U.S. citizens are eligible for consideration at this time.
• Ability to complete a pre‑employment background check and drug screening, which will include but is not limited to testing for marijuana use.
• 2 or more years of related experience in software test, verification, or integration roles.
• Experience working with software written in languages such as C, C++, Rust, VHDL, and Python in a Linux environment.
• Good written, verbal, and interpersonal communication skills.
• Bachelor of Science in Electrical Engineering, Aerospace Engineering, Mechanical Engineering, Computer Engineering, Computer Science, Computer Information Systems, or another related technical discipline.

• Flight software experience.
• Experience with Scrum and the Agile framework using tools such as JIRA.
• Experience with Git, Model Based Systems Engineering (MBSE), JAMA, and Confluence.
• Comfortable with common embedded communication protocols such as UART, SPI, I2C, USB, RS-232/422/485, and Ethernet.
• Experience working with networking protocols such as TSN, UDP, and TCP.
• Familiarity with software development and verification standards such as DO-178C.
• Experience reviewing or developing UML artifacts such as use‑case diagrams, activity diagrams, and timing diagrams.

Cimarron is an Equal Opportunity/Affirmative Action Employer, M/F/Disability/Veteran.