Mechanical Engineer, Fluids, Environmental​/Thermal Control

Axiom Space is a human space exploration company, building era-defining space infrastructure and delivering technology-driven solutions that will empower civilization to transcend Earth. Beginning with Axiom Station, successor to the International Space Station, the company is pioneering a next-generation orbital settlement that will foster groundbreaking innovation and research in microgravity and drive the global space economy of tomorrow. Today, guided by the vision of leading humanity's expansion off planet, Axiom Space is the principal provider of commercial human spaceflight services and developer of advanced spacesuits for the Moon and beyond.

For more information about Axiom Space, visit  .

Axiom Space fosters a work environment inclusive of all perspectives. We are the pioneers of commercial space, leading the transformation of low-Earth orbit into a global space marketplace. Our mission-driven team is seeking a bold and dynamic Mechanical Engineer with Fluids, Environmental, and/or Thermal Control experience who is fueled by high ownership, execution horsepower, growth mindset, and driven to understand our world, science/technology, and life itself, for the benefit of all on Earth and beyond.

We are seeking an experienced Mechanical Engineer to support the design, analysis, and testing of fluid and thermal systems for spaceflight hardware. The ideal candidate has strong fundamentals, hands-on test experience, and the ability to take components and subsystems from concept through integration. This position reports to Climate & Thermal Team Manager . This role is onsite and will be based at our Space Station Development Facility (SSDF).

• Select and qualify fluid and thermal system components (valves, sensors, regulators, pumps, heat exchangers, fittings).
• Conduct trade studies, define requirements, and work with suppliers to ensure components meet performance and environmental needs.
• Develop and execute test plans for component-level verification, including pressure and flow testing, thermal cycling, and leak testing.
• Analyze test data, troubleshoot anomalies, and document results in formal reports.
• Perform integrated system analyses combining fluid dynamics, thermodynamics, and heat transfer to size components and predict system behavior.
• Build and correlate analytical models (MATLAB/Python, CFD, or thermal tools) using component and system test data.
• Generate and maintain system documentation including P&IDs, interface control documents, drawings, and specifications.
• Collaborate with cross-functional teams (Stress, avionics, manufacturing) to ensure proper integration and meet mission requirements.
• Support hardware builds, system integration, and test operations as needed.
• Communicating project progress, status, and potential issues to stakeholders and leadership.
• Implementing and maintaining agile project management methodologies throughout the project lifecycle.
• Perform additional job duties as assigned.

To perform this job successfully, an individual must be able to perform each essential duty satisfactorily. The requirements listed below are representative of the knowledge, skill, and/or ability required. Reasonable accommodations may be made to enable individuals with disabilities to perform the essential functions.

Minimum Qualifications:

• BS in Mechanical Engineering (or Aerospace engineering) is required.
• 5+ years of experience working on mechanical, fluid, or thermal systems.
• Experience with fluid and/or thermal system design, analysis, and testing.
• Proficiency with mechanical design tools (CAD such as NX, Creo, or Solid Works) and analysis tools (MATLAB, Python, or equivalent).
• Experience designing or…