Power Electronics Engineer IV

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

Benefits offered by this job

Free gym

EV charging

Breakfast café

Grab & Go snacks

Basketball court

Walking paths

Job summary

Stored Energy Systems in Longmont, CO seeks a Power Electronics Engineer IV to design industrial battery chargers, inverters, and accessories from concept through production. You will work across the full product lifecycle with deep expertise in power conversion and embedded control systems.

The role requires 8+ years in power electronics or a master's with 6+ years, with experience in active front-end designs for AC inputs, EMI/EMC, and thermal/magnetic design.

Qualifications

• Bachelor's degree in electrical engineering or higher.
• 8+ years in power conversion; or master's with 6+ years.
• Experience designing active front-end for single/three-phase AC inputs.
• Strong EMI/EMC design and isolation knowledge.
• Knowledge of MOSFETs, SiC, GaN and gate drivers.
• Proficiency with LTspice for analog/power circuits.
• Solid control theory background and stability analysis.
• Thermal design and magnetics knowledge.
• Experience with isolated and non-isolated bidirectional topologies.
• Lab instrumentation experience.
• Proven track record taking products from concept to production.
• Excellent cross-functional collaboration.

Responsibilities

• Design, analyze, simulate, prototype, and validate power conversion systems.
• Develop and implement analog/digital control loops.
• Create and maintain product specifications and schematics.
• Conduct design reviews with engineering, manufacturing, and quality teams.
• Support production transition including DFM and test readiness.
• Troubleshoot issues in production and field environments.
• Mentor team members and drive continuous improvement.

Skills

Power conversion

Electrical engineering

AC inputs

EMI EMC design

MOSFETs SiC GaN

LTspice

Control theory

Thermal design

Transformers

Inductors

Grid isolation

Lab instrumentation

Embedded C/C++

Education

Bachelors in Electrical Eng

M.S. in Power Electronics

Tools

LTspice

Oscilloscopes

Data acquisition

Job description

Relocation assistance is available for this position.

Who We Are

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.

View the SENS Product Catalog

Summary

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.

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.

Required 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.

Preferred Qualifications

• 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++.

Location: This position is located in Longmont, CO with flexibility to work a hybrid schedule once fully trained.

Base Compensation: $170,000 - $200,000 is the projected range of annual base salary for this role depending on the candidate’s overall qualifications and experience.

Bonus: This position is eligible for an annual bonus based on individual and company performance.

Closing Date: October 17th While we expect to keep the position open through this date, the posting may be extended or closed early based on applicant volume and hiring needs.

Onsite Perks

• Free gym with 24/7 access
• Free Electric Vehicle charging
• Breakfast and Lunch Café
• After hours Grab & Go snacks
• Basketball court
• Walking paths

Benefits

• Paid Time Off
• Paid holidays
• Medical insurance
• Dental insurance
• Vision insurance
• Short-term and long-term disability
• Life insurance
• 401(k) plan with immediate vesting
• Employee referral program
• Tuition reimbursement
• Professional development

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.