Amperesand · 1 day ago
Sr. Staff Mechanical Design Engineer
San Francisco Bay Area
Full-time
Onsite
Senior Level, Lead/Staff
$150K/yr - $230K/yr
8+ years expAmperesand is disrupting industrial power with the first commercialized Solid State Transformer systems. The Sr. Staff Mechanical Design Engineer will lead the mechanical architecture and design of medium-voltage power electronics converter assemblies and complex electro-mechanical parts, utilizing CAD software to create detailed mechanical designs and collaborating with cross-functional teams to optimize production strategies.
ElectronicsInfrastructurePower GridRenewable Energy
Responsibilities
Utilize CAD software (3D EXPERIENCE (3DX), CATIA, NX, SolidWorks, Creo) to create detailed mechanical designs
Lead the mechanical architecture and design of medium-voltage power electronics converter assemblies and complex electro-mechanical parts including plastics, sheet metal, insulators, magnetic components, and high-voltage connectors
Perform structural FEA, thermal CFD, vibration, and fatigue assessments
Solve packaging challenges involving electrical isolation, sealing, thermal dissipation, EMI/EMC shielding, and mechanical shock/vibration
Define and execute structural, thermal, and environmental validation test plans
Create 2D drawings with GD&T, engineering documentation, tolerance stacks, BOMs, and release packages through PLM systems
Collaborate with electrical, thermal, Firmware and controls, manufacturing, test, industrial design, and suppliers to optimize DFM, DFA, and tooling strategies for high-volume production
Lead prototype development, fabrication, assembly, and mechanical testing of new designs
Support root-cause analysis of pilot or production issues and lead iterative improvements
Drive trade studies on design architecture, materials, and manufacturing processes
Guide selection for structural, thermal, and electrical compatibility in high-voltage environments
Contribute to cooling system layouts including cold plates, thermal interfaces, and airflow paths
Develop assembly procedures and manufacturing instructions to support scalable production
Participate in mechanical FMEA and DVP&R activities
Work with quality and reliability teams to meet performance, lifecycle, and safety targets
Mentor junior engineers and provide technical leadership across product programs
Contribute to technology development for future-generation SST products and enclosures
Qualification
Required
8+ years of experience in mechanical design for power electronics, automotive, industrial, or energy products
Bachelor's or Master's degree in Mechanical Engineering or a related field
Expertise in CAD modeling using 3DEXPERIENCE (CATIA V6/V5), SolidWorks, NX, or Creo
Deep understanding of statics, dynamics, heat transfer, and materials
Proficiency in GD&T, tolerance analysis, and DFM/DFA principles
Experience designing enclosures for IP-rated or outdoor-rated power equipment
Experience with injection molding, die casting, extrusion, and sheet metal forming
Working knowledge of metals (aluminum, steel), plastics, ceramics, gaskets, and potting compounds
Hands-on experience taking designs from prototype through production deployment
Familiarity with PLM systems (3DEXPERIENCE, Windchill, etc.) and engineering change workflows
Comfortable with root-cause analysis, failure mode resolution, and mechanical reliability testing
Strong communication skills and ability to lead cross-functional design reviews and technical deep-dives
Prior experience collaborating with suppliers on tooling development, DFM feedback, and tolerance negotiations
Familiarity with PCBAs, connectors, and mechanical integration of high-density electronic assemblies
Experience with design and test documentation for regulatory standards (UL, IEC, NEC)
Ability to drive concurrent engineering initiatives across product timelines
Passion for product innovation, sustainability, and electrification
Willingness and ability to travel 15%–20%, including internationally
Preferred
Experience working in Agile development environments using Scrum methodologies and tools like Jira
Strong background in structural, thermal, and vibration analysis using Ansys Mechanical, Fluent, and Maxwell
Familiarity with electronics packaging and PCB interface considerations
Experience with medium- to high-voltage systems and insulation coordination (creepage, clearance, potting, sealing)
Benefits
Competitive Salary + Incentive Stock Options
Medical, vision, and dental benefits for employees and their dependents, effective from the start of hire
Company paid Basic Life, AD&D, short-term and long-term disability insurance
Employees receive paid time off (PTO), paid sick days, and paid company holidays so they can rest, recharge, and take care of their health and personal needs.
Commuter Benefits
12 Weeks Paid Parental Leave
Company
Amperesand
Amperesand operates as a grid infrastructure solution provider.
11-50 employees
H1B Sponsorship
Amperesand has a track record of offering H1B sponsorships. Please note that this does not
guarantee sponsorship for this specific role. Below presents additional info for your
reference. (Data Powered by US Department of Labor)
Distribution of Different Job Fields Receiving Sponsorship
Represents job field similar to this job
Trends of Total Sponsorships
2025 (5)
Funding
Current Stage
Early StageTotal Funding
$92.45M2025-11-18Series A· $80M
2024-02-07Seed· $12.45M
Leadership Team
Sriram Vaisambhayana
Co-Founder
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