Senior Power Electronics Engineer — High-Power Systems

Stored Energy Systems; Longmont (CO); Hybrid; USD 170,000 - 200,000; Full time

Benefits offered by this job

Free gym with 24/7 access

Free EV charging

Breakfast and Lunch Café

Paid Time Off

401(k) plan with immediate vesting

Employee referral program

Job summary

Stored Energy Systems (SENS) is a long-established manufacturer in Longmont, CO, seeking a Power Electronics Engineer IV to design and develop industrial battery chargers, inverters, and related accessories across a wide power range (150W to 100kW). The role spans concept through production launch with deep expertise in power conversion and embedded control systems.

You will lead cross-functional collaboration across Engineering, Manufacturing, and Quality, implement analog/digital control

Qualifications

• Bachelor’s degree in electrical engineering with 8+ years of power conversion experience OR a master’s degree with a focus in power electronics and 6+ years of power conversion experience.
• Proven experience designing power conversion systems, including active front-end designs for single and three-phase AC inputs.
• Strong understanding of isolation requirements, including creepage and clearance standards (UL, IEC).
• Experience with EMI/EMC design, compliance, filtering, and troubleshooting.
• Deep knowledge of power semiconductor devices (MOSFETs, SiC, GaN), gate drivers, and protection circuits.
• Proficiency in analog and power circuit simulation tools (e.g. LTspice).
• Strong foundation in control theory, including design, modeling, and stability analysis of control loops.
• Experience with thermal design and analysis (heatsinking, airflow, and loss modeling).
• Knowledge of magnetics design, including transformers and inductors (core selection, winding techniques).
• Experience with isolated and non-isolated bidirectional topologies (DAB experience strongly preferred).
• Hands-on experience with lab instrumentation (oscilloscopes, power supplies, electronic loads, network analyzers).
• Demonstrated success bringing products from concept through volume production.
• Strong collaboration and communication skills with the ability to work effectively across teams.

Responsibilities

• Design, analyze, simulate, prototype, and validate power conversion systems and topologies.
• Develop and implement both analog and digital control loops.
• Create and maintain technical documentation, including product specifications, schematics, and interface control documents.
• Conduct design reviews and collaborate cross-functionally with Engineering, Manufacturing, and Quality teams.
• Support product transition to manufacturing, including design for manufacturability and test readiness.
• Troubleshoot and resolve complex issues in production and field environments.
• Mentor and support the development of team members, contributing to a culture of continuous improvement.

Skills

Power electronics

Active front-end design

Control systems

EMI/EMC design

Thermal analysis

Lab instrumentation

Transformer/inductor design

Isolated/non-isolated topologies

Cross-functional collaboration

Education

Bachelor’s degree in Electrical Engineering

Master’s degree in power electronics

Tools

LTspice

Oscilloscope

Job description

Stored Energy Systems (SENS) is a long-established manufacturer in Longmont, CO, seeking a Power Electronics Engineer IV to design and develop industrial battery chargers, inverters, and related accessories across a wide power range (150W to 100kW). The role spans concept through production launch with deep expertise in power conversion and embedded control systems.

You will lead cross-functional collaboration across Engineering, Manufacturing, and Quality, implement analog/digital control