As a Senior Staff Mechanical Engineer at Rivian, you will lead the mechanical development of next-generation traction inverter systems from concept to mass production. You will manage a team of mechanical engineers while ensuring the design and architecture of critical subsystems meet engineering standards. This role requires deep technical expertise and the ability to influence cross-functional teams and supplier strategies. You will work in a dynamic environment focused on innovation and sustainability.

• Bachelor's degree in mechanical engineering or a related engineering discipline; Master's degree preferred.
• 8+ years of engineering experience specifically in the development and packaging of Power Electronics assemblies.
• High-level proficiency in CATIA V5 or V6 (3DEXPERIENCE), specifically within Part Design and Assembly Design workbenches.
• Proven track record designing for high-pressure die casting, injection molding and sheet metal fabrication at production scale.
• Deep expertise in high-voltage busbar design, HV/LV wire harness routing and integration and sealing/gasket systems.
• Practical experience with joining and integration technologies: laser welding, press-fit, soldering, heat staking and thermal interface materials (TIM).
• Expert command of GD&T (ASME Y14.5) and a track record developing system-level DFMEAs and validation plans spanning mechanical, electrical and thermal domains.
• Working knowledge of the ENOVIA Product Lifecycle Management environment.
• Extensive experience managing external technical suppliers, ensuring quality and timeline adherence.
• Demonstrated ability to lead structured root-cause analysis (8D, Fishbone, 5-whys) on complex field and manufacturing failures.
• General knowledge of mechanical best practices for PCBA design and integration.
• Prior experience in the Automotive industry (Tier 1 or OEM), ideally in EV powertrain or high-voltage systems.
• Proficiency with Microsoft Project, Visio, and the standard Office suite.

• Directly manage, mentor, and develop a team of mechanical engineers, setting clear goals and providing technical guidance.
• Define team structure, workload allocation, and hiring needs in partnership with the Mechanical Engineering Director.
• Cultivate a culture of engineering excellence and continuous improvement within the team.
• Serve as the principal mechanical architect for traction inverter assemblies, owning design decisions from system-level packaging through component-level detail.
• Define and enforce mechanical design standards, design guidelines, and best practices across the Power Electronics engineering team.
• Lead architecture reviews and design phase gate decisions, ensuring solutions are scalable and manufacturable.
• Design and engineer complex subsystems including high-pressure die castings, injection-molded plastics, busbars, and sheet metal.
• Own the full mechanical release cycle in ENOVIA, governing data integrity and design maturity.
• Drive weekly technical reviews with suppliers to resolve open design items and maintain delivery commitments.
• Act as the senior technical escalation point for Supply Chain and Supplier Quality on critical path issues.
• Support the generation of high-impact engineering documents including Component Technical Specifications and assembly manuals.
• Establish and maintain top-level assembly BOMs with full attribute integrity across complex product configurations.
• Lead mechanical readiness for pre-production and production line commissioning, including the design of test fixtures and assembly aids.
• Partner with Manufacturing Engineering as a senior stakeholder in production line design, validation and launch.
• Own the root cause investigation process for field failures and prototype escapes, driving systemic design improvements.
• Support the development and execution of Design Verification test plans, ensuring long-term reliability and regulatory compliance.

• 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.