Senior Reliability Engineer - Power Electronics

Lunar Energy • Mountain View, CA

4d

About The Position

Lunar Energy is seeking a Senior Reliability Engineer to ensure the reliability of its home energy products throughout their lifecycle. The role contributes to design, develops reliability test plans, evaluates ongoing field performance, and drives failure analysis and product improvements. The engineer collaborates with mechanical and electrical engineering teams on power electronics and battery systems and works with finance on warranty insights. Lunar Energy describes itself as a fast-growing global clean-energy company focused on electrifying homes and connecting communities through clean, resilient virtual power plants.

Requirements

• Degree in Mechanical Engineering, Electrical Engineering, Chemical Engineering, Physics, or equivalent.
• Proven track record of solving complex power electronics reliability failures.
• Working knowledge of the theory of operation of common power converter topologies, such as inverters and buck-boost converters.
• Strong grasp of PCBA-level failure physics, including CTE mismatch, solder fatigue, contact resistance, and insulation degradation.
• Familiarity with failure modes in common power electronics components, including electrolytic capacitors, relays, semiconductors, and magnetics.
• Working knowledge of failure analysis techniques such as optical microscopy, SEM, CSAM, X-ray, cross-sectioning, and EDX, including selecting an appropriate technique for a given failure.
• Experience with accelerated life testing models and governing equations, particularly for PCBAs, battery storage, and relevant mechanical structures.
• Understanding of reliability statistics.

Responsibilities

• Collaborate with mechanical and electrical engineers during hardware design to establish and refine component- and system-level reliability targets for power electronics and battery systems.
• Provide Design for Reliability (DfR) input during new product development.
• Drive Design Failure Modes and Effects Analyses (DFMEA) for systems, identifying performance risks and implementing mitigation activities.
• Develop accelerated life test (ALT) reliability plans for components and subsystems based on identified risks, reliability targets, and physics-of-failure methodology.
• Track field reliability metrics, including part replacements, customer complaints, and fault codes.
• Identify opportunities for continuous product improvement and reliability growth.
• Collaborate with the finance team to provide insights into the warranty program.
• Drive failure analysis of reliability-test failures and/or field returns to determine root causes and lead containment and corrective actions.

Benefits

• Equity in a fast-growing company and participation in the employee stock program.
• Medical, dental, and vision insurance for employees and dependents.
• Flexible paid time off and 10 paid holidays.
• Tax-deferred 401(k) plan.
• Paid parental leave for full-time employees, including 12 weeks for the birthing mother and 6 weeks for the non-birthing parent.
• Subsidized EV charging and pre-tax commuter benefits.

What This Job Offers

• Job Type: Full-time
• Career Level: Senior