As the lead staff mechanical engineer at Rivian, you will be responsible for driving the design of the next-generation Power Electronics Module from concept to production. This role involves close collaboration with cross-functional teams to tackle complex packaging challenges. You will design critical components such as busbars and metal housings while ensuring alignment with manufacturing processes. The position is based in Torrance, CA and reports to the Sr. Mechanical Engineering Manager.

• Bachelor's degree in mechanical engineering or a related engineering discipline; Master's degree preferred.
• 5+ years of engineering experience specifically in the development and packaging of Power Electronics assemblies.
• Expert-level proficiency in CATIA V5 or V6 (3DEXPERIENCE), specifically within Part Design and Assembly Design workbenches.
• Proven track record designing for diverse processes, including high-pressure die casting, injection molding, and sheet metal fabrication.
• Deep experience in the design of high-voltage busbars, HV/LV wire harnesses and sealing/gasket systems.
• Practical knowledge of integrating components using laser welding, press-fit, soldering, heat staking and thermal interface materials (TIM).
• High proficiency in GD&T (ASME Y14.5) and experience developing DFMEA documents and system-level validation plans.
• Working knowledge of the ENOVIA Product Lifecycle Management environment.
• Extensive experience managing external technical suppliers, ensuring quality and timeline adherence.
• Demonstrated ability to use structured root-cause analysis techniques to identify and resolve complex component failures.
• General knowledge of mechanical best practices for PCBA design and integration.
• Prior experience in the Automotive industry (Tier 1 or OEM).
• Thrives in a fast-paced startup environment.
• Proficiency with Microsoft Project, Visio, and the standard Office suite.

• Support the mechanical development of Power Electronics Modules using CATIA V6/3DEXPERIENCE.
• Design and engineer a wide array of components, including high-pressure die castings, injection-molded plastics, busbars, sheet metal, high/low voltage harnesses, sealing interfaces, and PCBA mechanical integration.
• Manage the full release cycle of mechanical components using ENOVIA, ensuring data integrity and design maturity.
• Generate and maintain complex Top-Level Assembly Bills of Materials (BOM), ensuring all component attributes are captured with 100% accuracy.
• Drive weekly technical reviews with suppliers to close open design items, manage timelines, and ensure DFM alignment.
• Act as the primary technical liaison for Supply Chain and Supplier Quality teams to resolve action items and maintain production schedules.
• Author critical engineering documents, including Component Technical Specifications, Statements of Work for sourcing, and detailed assembly manuals.
• Lead the creation of DFMEAs and develop robust Design Verification test plans to ensure long-term product reliability.
• Provide on-site support for pre-production lines, including the design of specialized mechanical test fixtures and assembly aids.
• Collaborate closely with Manufacturing Engineering to design, validate, and commission the production line on schedule.
• Lead troubleshooting efforts for issues arising during prototype builds and scale-up.
• Spearhead the root cause investigation of field failures related to mechanical assemblies, implementing design improvements to prevent recurrence.

• Employees at Rivian are often offered comprehensive health, dental, and vision insurance, a 401(k) with company match, ESPP and potential RSU grants, performance bonuses, and generous time off including paid parental and sick leave. Perks can include 24/7 mental-health coaching and therapy, Hinge Health for Anthem enrollees, tuition assistance and professional development, plus on-site food and a wide range of employee discounts on items like computers, mobile phones, home loans, and pet care.