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Longmont, CO, US

3 days ago Requisition ID: 1430

Salary Range: $170,000.00 To $200,000.00 Annually

Stored Energy Systems (SENS) is an award-winning manufacturer of premium quality power conversion products located in Longmont, CO. In business for over 50 years, SENS is the market leader with a proven track record of providing highly reliable battery chargers, DC power systems, and related products to industrial markets. For more information on our company please see our web site at www.sens-usa.com .

We are seeking a highly skilled Power Electronics Engineer IV to design and develop industrial battery chargers, inverters, and related accessories across a wide power range (150W to 100kW) for critical power applications. This role spans the full product lifecycle from concept development and design through production launch and ongoing support and requires deep technical expertise in power conversion and embedded control systems.

• 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.

• 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.

• Experience designing and certifying grid-tied systems to UL 1741.
• Knowledge of phase-locked loops (PLL) for grid synchronization.
• Experience with large-scale battery energy storage systems (BESS), UPS systems, and battery charging applications.
• Advanced programming skills in embedded C/C++.

• Free gym with 24/7 access
• Free Electric Vehicle charging
• Breakfast and Lunch Café
• After hours Grab & Go snacks
• Basketball court
• Walking paths
• Paid Time Off
• Paid holidays
• Medical insurance
• Vision insurance
• Short-term and long-term disability
• Life insurance
• 401(k) plan with immediate vesting
• Employee referral program

At SENS, our culture is rooted in a set of core values that reflect who we are and how we work. In a recent 2025 poll, our employees identified the values that best define us: Innovative, Respectful, Inviting, Flexible, Collaborative, and Growth Driven. Our team describes us as a dynamic, forward-thinking company where everyone has the opportunity to thrive.

We pride ourselves on being an equal opportunity employer, fully dedicated to fostering inclusion and diversity. We welcome all applicants, regardless of race, color, religion, sex, sexual orientation, gender identity, genetic information, national origin, age, disability, veteran status, or any other legally protected characteristic.

We hope you're interested in making a difference with us. Even if you don't feel that you meet every qualification listed in this job description, we still encourage you to apply.