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Sr. Power Electronics Design Engineer, Magnetics

San Francisco, California, United States

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!

Responsibilities

  • Design isolated and non-isolated converter stages using advanced topologies such as multi-level converters, cascaded H-bridges, Dual Active Bridge (DAB) and ensuring robust protection and safety compliance for MV/LV systems
  • Perform trade-off analysis and optimization of power conversion hardware to balance between loss, cost and size across Semiconductors, Magnetics and Cooling components
  • Design magnetics to meet applicable safety, isolation, and thermal standards
  • Design and verify high-voltage isolation strategies using magnetically and optically isolated signal and power paths across LV-MV domains
  • Use FEA simulations to design magnetics and guide high-power high-frequency PCBA designs
  • Work in close coordination with mechanical designers, manufacturing and test engineers to own the complete development cycle
  • Own the design validation of the magnetics components to validate performance targets, isolation requirements

 

Qualifications

  • M.S. or Ph.D. in Power Electronics, Electromagnetics or related field
  • 4+ years' experience in magnetics design and in power conversion design
  • Strong fundamentals in electromagnetics and material properties
  • Experience working with SiC/GaN devices in high power density designs
  • Good understanding of loss mechanisms in semiconductor devices and high-frequency magnetics
  • Knowledge of Medium Voltage insulation coordination, hands-on experience with Hi-pot, Partial Discharge and Basic Impulse Test 
  • Knowledge of EMI/EMC test Standards and Electrical Safety (IEC, UL) Standards.
  • Strong analytical skills for interpreting simulation and test data to guide design revisions.
  • Excellent written and verbal communications in English
  • Willingness and ability to travel up to 10% including internationally

Please note: This role requires working on-site 5 days a week. We do not offer hybrid or remote options. 

 

Pay Disclosure & Benefits

Compensation will be determined based on experience, location, and other factors permitted by law.  

The benefits outlined below apply exclusively to employees located in the United States.

  • 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 
  • 6-12 weeks 100% paid parental leave

Singapore-based employees receive benefits in accordance with local government provisions.

Equal Employment Opportunity 

Amperesand is an equal opportunity employer and complies with all applicable federal, state, and local fair employment practices laws. All qualified applicants will receive consideration for employment without regard to race, color, religion, national origin, ancestry, sex, sexual orientation, gender, gender expression, gender identity, genetic information or characteristics, physical or mental disability, marital/domestic partner status, age, military/veteran status, medical condition, or any other characteristic protected by law. 

Amperesand is also committed to working with and providing reasonable accommodations to individuals with disabilities. Please let your recruiter know if you need an accommodation at any point during the interview process. 

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