Mechanical Engineer, Fluids, Environmental, and/or Thermal Control

Axiom Space is building the world’s first commercial space station – Axiom Station. Serving as a cornerstone for sustained human presence in space, this next-generation orbital platform fosters groundbreaking innovation and research in microgravity, and cultivates the vibrant, global space economy of tomorrow. Today, driven by the vision of leading humanity's journey off planet, Axiom Space is the principal provider of commercial human spaceflight services to the International Space Station and developer of advanced spacesuits for the Moon and low-Earth orbit. Axiom Space is building era-defining space infrastructure that drives exploration and fuels a vibrant space economy that will empower our civilization to transcend Earth for the benefit of every human, everywhere. 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. POSITION SUMMARY 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). KEY DUTIES & RESPONSIBILITIES 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. QUALIFICATIONS:  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. Education & Experience 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 SolidWorks) and analysis tools (MATLAB, Python, or equivalent). Experience designing or analyzing fluid components (valves, regulators, pumps, lines, manifolds) or thermal systems (heat exchangers, radiators, cold plates). Demonstrated ability to take engineering designs from concept through testing to production and delivery. Strong communication, documentation, and troubleshooting skills. Hands-on experience with test execution (pressure testing, flow testing, thermal cycling) and post-test data analysis. Track record of delivering outcomes in ambiguous, fast-moving environments. Uses good judgement to problem-solve proactively, positively impacting hard challenges. Proven to deliver high quality results under tight deadlines. Preferred Qualifications: Strong understanding of fluid mechanics, heat transfer, and thermodynamics. Hands on experience with thermal control hardware. Experience with CFD, FEA, or thermal modeling tools such as ANSYS Fluent, Star-CCM+, Thermal Desktop, SINDA/Fluint. Experience integrating mechanical and electrical systems, including sensors, harness routing, connectors, and control hardware. Understanding of electrical interfaces such as wiring diagrams, signal conditioning, grounding, and EMI/EMC considerations. Knowledge of industry standards (NASA, ASME, ASTM, MIL-spec). Familiarity with vacuum system design, materials for space environments, and contamination control. Grit Passion for space and the mission Entrepreneurial, growth mindset Perseverance Resourceful, adaptable Skills Executes priorities with precision and pace High EQ and ability to collaborate within teams and cross-functionally Tech-savvy in using systems and tools to move faster and smarter Excellent written and verbal communication skills Competencies: Embody our core values of leadership, innovation, and teamwork. In addition, to perform the job successfully, an individual should demonstrate the following competencies: Accountability Sense of Urgency Extreme Ownership Execution and Delivery Efficiency Effectiveness WORK ENVIRONMENT: Generally, an office environment, but can involve inside or outside work depending on the task. Requirements  Must be able to complete a U.S. government background investigation. Management has the prerogative to select at any level for which the position is advertised. Proof of U.S. Citizenship or US Permanent Residency is a requirement for this position. Must be willing to work evenings and weekends as needed to meet critical project milestones. Physical Requirements Work may involve sitting or standing for extended periods (90% of the time) May require lifting and carrying up to 25 lbs. (5% of the time) Equipment and Machines Standard office equipment (PC, phone, printer, etc.) Axiom Space is proud to be an equal opportunity employer.  Axiom Space does not discriminate on the basis of race, regional color, national origin, gender (including pregnancy, childbirth, or related medical conditions), sexual orientation, gender identity, gender expression, age, status as a protected veteran, status as an individual with disability, or other applicable legally protected characteristics.