Battery Phd Engineer Jobs in Santa Rosa, CA (NOW HIRING)

Description
Enphase Energy is a global energy technology company and a leading provider of solar, battery, and electric vehicle charging products. Founded in 2006, our innovative microinverter technology revolutionized solar power, making it a safer, more reliable, and scalable energy source. Today, the Enphase Energy System enables users to make, use, save, and sell their own power. Enphase is also one of the most successful and innovative clean energy companies in the world, with more than 80 million products shipped across 160 countries.
Join our dynamic team designing and developing next-gen energy technologies and help drive a sustainable future!
About the role
This position sits within the core Engineering R&D group focused on our Solid-State Transformer (SST) platform. Our team is responsible for defining and delivering the next-generation power module, with higher power density to reduce footprint and thermal load. We're looking for a technically deep power electronics engineer focused on increasing efficiency while reducing cost per watt.
What You Will Do

• Design and develop power conversion circuits and magnetics for the SST platform, optimizing for power density, efficiency, and thermal performance
• Evaluate and integrate advanced power semiconductor devices (particularly, GaN) and planar magnetics to increase power throughput while shrinking module footprint
• Translate modeling and simulation results into benchtop prototypes, and reconcile differences between predicted and measured performance
• Drive design trade-offs across power density, efficiency, thermal management, and cost per watt to meet next-generation product targets
• Co-design with mechanical and thermal engineering to jointly optimize packaging, cooling, and power density, and collaborate with controls engineering to integrate power modules into the SST platform
• Lead root-cause analysis and design iteration based on test data to continuously improve power density and reliability

Who You Are and What You Bring

• B.S., M.S., or Ph.D. in Electrical Engineering or closely related field
• Senior Engineer: BS + 5 yrs MS + 3 yrs PhD + 1yr; Staff Engineer: BS + 8 yrs MS + 6 yrs PhD + 3 yrs; Sr. Staff Engineer: BS + 12 yrs MS + 8 yrs PhD + 5 yrs
• Typically, 6+ years of electronics hardware/system design experience (or equivalent depth of experience)
• Hands-on experience in the full cycle of schematic capture, layout, and testing of power electronics, particularly if focused on power density
• Proficiency with one or more ECAD tools such as OrCAD, KiCad, or Altium
• Ability to translate modeling and simulation to benchtop performance and be able to reconcile differences between theory and practice
• Familiarity with advanced power semiconductor devices and magnetics (particularly planar transformers)
• Experience co-designing power electronics with mechanical and thermal engineering teams, balancing electrical performance against packaging and cooling constraints. Familiarity with a mechanical CAD tool such as SolidWorks, Fusion 360, or FreeCAD is a plus.
• Ability to lead technical execution of significant power electronics designs with a high degree of autonomy, including digital controls and automation for testing, escalating major trade-offs as needed
• Experience mentoring less experienced engineers and contributing to technical design reviews within the team

The base salary range for this position in Petaluma, CA is $105,000 to $162,000 and may vary based on experience, skills, and location.
This position is also eligible for bonus, equity, and benefits, with final compensation determined in accordance with applicable laws and internal equity.