Software Test Engineer

Position Introduction/Key Duties

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 or permanent residents 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.
• 5 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 a global solutions company with a strategic partnering approach to satisfying customer‑driven requirements. We ensure customer success with a modern approach and experienced leadership. Driven by an entrepreneurial spirit, Cimarron is fueled by highly skilled employees, developing new innovative technologies, and delivering superior products and services. We believe in recognizing employees' worth by offering competitive salaries and benefits, including health, dental, and vision insurance, 401(k) contributions, educational reimbursement, and much more.

From company communication through Company‑wide information meetings led by our President and CEO, to an Awards program designed to recognize our amazing employees and their accomplishments, you will not only feel like you are a part of a team, you will be a valued member of the Cimarron family. Cimarron is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, age, sex, sexual orientation, gender identity, religion, national origin, disability, veteran status, or any other characteristic protected by federal, state, or local law.