Mechanical Engineer (Physical Infrastructure)

ABOUT xAI xAI’s mission is to create AI systems that can accurately understand the universe and aid humanity in its pursuit of knowledge. Our team is small, highly motivated, and focused on engineering excellence. This organization is for individuals who appreciate challenging themselves and thrive on curiosity. We operate with a flat organizational structure. All employees are expected to be hands-on and to contribute directly to the company’s mission. Leadership is given to those who show initiative and consistently deliver excellence. Work ethic and strong prioritization skills are important. All employees are expected to have strong communication skills. They should be able to concisely and accurately share knowledge with their teammates. ABOUT THE ROLE: We are seeking exceptional Mechanical Engineers to join our growing team in Memphis and help design, build, and optimize the mechanical infrastructure for xAI’s high-density AI supercomputing facilities. This is a broad Mechanical Engineer requisition covering three critical focus areas: Thermal Mechanical Engineering (liquid cooling, heat exchangers, CFD analysis) Systems Component Mechanical Engineering (enclosures, manifolds, structural assemblies, fluid handling) HVAC Design Mechanical Engineering (facility air systems, CRAC/CRAH, airflow management) You will work on one or more of these areas depending on your expertise and business needs, collaborating across thermal, mechanical, electrical, power, and construction teams to push the boundaries of performance, efficiency, and reliability at massive scale. This is a full-time, onsite role based in the Memphis region. RESPONSIBILITIES: Design and optimize mechanical systems for high-density AI data centers, including liquid cooling loops, cold plates, manifolds, heat exchangers, server enclosures, structural supports, and facility HVAC systems. Perform detailed engineering analysis — thermal, fluid dynamics, structural, airflow, and heat transfer — using CFD, FEA, and other simulation tools. Develop specifications, 3D models, drawings, BOMs, and test plans; support prototyping, qualification, and iterative improvements. Integrate mechanical systems with power generation, electrical infrastructure, liquid cooling, and building MEP systems. Conduct failure mode analysis (FMEA), root cause investigations, and reliability modeling to meet extreme uptime and efficiency targets. Collaborate with cross-functional teams on new facility designs, cluster expansions, and continuous improvement of mechanical standards. Interface with vendors and contractors for equipment selection, fabrication, installation, and commissioning. Drive design decisions that balance performance, manufacturability, cost, and scalability. BASIC QUALIFICATIONS: Bachelor's degree in mechanical engineering or other engineering discipline PREFERRED SKILLS AND EXPERIENCE: Previous experience in designing and maintaining industrial HVAC, plumbing, mechanical systems Proven track record in clean-room design and maintenance, underscoring an understanding of stringent environmental control requirements Proficiency in implementing maintenance solutions with minimal operational impact Demonstrated ability to assist technicians with troubleshooting and repair efforts effectively Capacity to thrive in high-concentration, high-stress environments, with flexibility to work extended hours as required Attentive to detail and proactive in executing preventive maintenance initiatives Familiarity with AutoCAD/Revit software applications at a beginner to intermediate skill level Knowledgeable about relevant industry codes and standards, such as ASHRAE, NFPA, and International Building Code Previous experience in system design, sizing, specification, and installation, particularly focusing on HVAC chillers, pumps, boilers, air handlers, and HEPA filtration systems In-depth understanding of HVAC operations, especially in managing chilled water plants operated through air-coole