Sr. Mechanical Design Engineer

Company Overview

Amperesand is reinventing how the world powers its most critical systems.

We are facing a once-in-a-generation opportunity for infrastructure disruption. Electricity demand is skyrocketing, driven by AI factories, electric vehicles, and modern industrial growth. Energy supply is shifting to incorporate a more diverse mix of resources – including solar, gas, and batteries – at a massive scale.

And yet the power infrastructure behind our latest mega-projects hasn’t meaningfully changed in nearly 100 years. Supply chains for today’s infrastructure equipment can’t match the pace and sophistication of critical energy projects. Ampersand is building hardware and software that rewrites this broken power infrastructure playbook to support a new era of energy abundance.

We’ve built a new class of intelligent, software-defined power infrastructure products leveraging a decade of advanced medium voltage Solid State Transformer research that’s now ready for commercial deployment.

Our products and solutions go far beyond the capabilities of traditional electrical equipment. We make power systems that are faster to deploy, dramatically smaller and more efficient, and capable of supporting modern, dynamic energy needs for tomorrow’s most demanding energy consumers.

Scalable in‑house advanced manufacturing capability is our foundation for meeting timeline and quality expectation to serve infrastructure customers around the world.

Amperesand is led by breakthrough energy hardware development veterans and funded by top tier investors who share our vision of building a category‑defining energy technology company.

With hubs in San Francisco, Reno, and Singapore, our global team is laser focused on building foundational technology to solve the most pressing problems in power infrastructure at scale.

Join us in building the power foundation of the future!

• Utilize CAD software (3D EXPERIENCE (3DX), CATIA, NX, Solid Works, 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

• 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 3
  
  DEXPERIENCE (CATIA V6/V5), Solid Works, 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
• E…