Since its founding in 2015, 1X has been at the forefront of developing advanced humanoid robots designed for household use. Our mission is to create an abundant supply of labor via safe, intelligent humanoids. As a Simulation Engineer at 1X Technologies, you will lead thermal and multi-body structural analysis for advanced robotic systems, supporting design decisions across development and production. Responsibilities - Build and validate thermal models for actuators, electronics, and enclosures. - Perform multi-body dynamics simulations for robot motion and load cases. - Develop structural FEA models to assess stress, fatigue, and stiffness. - Correlate simulations with test data; improve model fidelity. - Define simulation best practices, templates, and documentation. - Collaborate with mechanical, controls, and HW teams to translate requirements into models. - Run DOE and sensitivity studies to guide design decisions. - Support design reviews with clear technical reports and visualizations. - Automate simulation workflows with scripting where appropriate. - Contribute to system-level trade studies and architecture decisions. About You - BS/MS in Mechanical, Aerospace, or related field. - 5+ years in thermal, structural, or dynamics simulation. - Proficiency in FEA/CFD tools (e.g., ANSYS, Abaqus, COMSOL) and MBD tools (e.g., MSC Adams). - Strong understanding of heat transfer, materials, and mechanics. - Experience with test correlation and validation methods. - Ability to create robust boundary conditions and load cases. - Scripting skills (Python/MATLAB) for automation and post-processing. - Clear technical communication and documentation. - Comfort working in fast-paced, cross-functional environment. - Hands-on mindset; ability to interpret hardware constraints and manufacturing realities. Benefits & Compensation - Salary Range: $119,800 - $203,800 + Equity - Health, dental, and vision insurance - 401(k) with company match - Paid time off and holidays Equal Opportunity Employer 1X is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, gender, gender identity or expression, sexual orientation, national origin, ancestry, citizenship, age, marital status, medical condition, genetic information, disability, military or veteran status, or any other characteristic protected under applicable federal, state, or local law.