Systems Modeling Engineer, ESS

Job Title: Systems Modeling Engineer

Location: Burlingame, CA

Department: ESS Engineering

Reports To: Senior Staff Thermal Engineer

Position Type: Full-time

About Peak Energy

Peak Energy is the first American venture to advance globally proven Sodium-Ion battery systems as the storage standard for the new era of renewable energy on a resilient grid.

Sodium-Ion is cheap, readily available and safe, making it the leading contender in a rapidly evolving market.

Our leadership team is powered by decades of expertise in scaling gigawatt-level innovation at world-class companies such as Tesla, Northvolt, Apple, Powin, Enovix, Zipline, Solid Power, and Fluence. We are backed by strategic investment and product partners such as TDK Ventures and Eclipse Ventures.

We are a team of engineers, operators, entrepreneurs, and partners driven by a shared ambition to set the new performance standard for renewable energy and grid resilience.

About the Role – Systems Modeling Engineer

Peak Energy is looking for a Systems Modeling Engineer to join our Energy Storage Systems (ESS) team and work at the forefront of the development of our gigawatt-scale energy storage systems. This role will leverage deep expertise to drive major thermal and electrical architectural decisions and dive into key electrical and battery component simulation.

You will work closely with design, test, validation, manufacturing engineering, and leadership to navigate our products' development — exploring broadly and diving deeply with a drive for rigorous optimization, meticulous documentation, and clear communication of findings.

The ideal candidate is a self-starter who is hungry for knowledge, holds themselves and others to high standards, and brings a get-it-done attitude to every challenge — big or small.

What You'll Do

• Define system and component design direction and requirements by developing detailed models of battery energy storage systems across operating modes and external conditions, including battery modules and power electronic components


• Identify key performance indicators and optimize system design to enhance these metrics


• Validate models with experimental data and refine them based on test results


• Explore broadly and deeply, and clearly communicate assumptions, inputs, and findings


• Define and spearhead selection and development of tools, infrastructure, and design practices


• Interface tightly with design, test, and validation partners to inform design decisions


• Drive and participate in a culture of rapid prototyping and testing

What You'll Bring

• Bachelor's or master's degree in Mechanical, Electrical, Systems Engineering, or a related field


• 5–10 years of experience working with power systems (non-academic)


• Experience with system-level equivalent circuit models


• Strong electrical and thermal engineering fundamentals


• Extensive use of MATLAB/Simulink or Python


• Familiarity with high voltage battery systems or power electronics


• Experience with design and manufacturing of medium to high volume products


• Hands-on prototyping, validation, and testing experience


• Passion for renewable energy, sustainability, and driving positive environmental impact through technology innovation


• Eligible to work in the U.S.

Preferred Qualifications

• High voltage battery and power electronics experience


• Utility-scale energy storage systems experience


• Supervisory control simulation experience

Peak Energy is committed to building a diverse and inclusive workforce. We strongly encourage women, people of color, and individuals from underrepresented groups to apply. We value skills, potential, and perspective over specific credentials. If you're excited about this role but your experience doesn't look perfect on paper, we still want to hear from you.

Our Core Values

• Speed Through Focus – Move fast but understand why. Focus on the goal, don't sacrifice quality.


• Mission Over Self – It's about the greater good; confident humility. Take ownership and accountability.


• Face the Brutal Truth – Transparency, honesty, big picture curiosity. Fearless decision making.


• Be a Good Person – Kindness, collaboration and teamwork.

Compensation & Benefits

The salary range for this role is $170,000–$230,000, with actual pay varying based on work location, experience, and skills. Our competitive benefits package includes:

• Flexible time off


• Comprehensive medical, dental, and vision coverage


• Strong 401(k) plan


• Equity opportunities


• Many great work perks

Join us to thrive in a supportive environment while making a meaningful impact in the energy sector!

At Peak Energy Technologies Inc., we believe that a diverse and inclusive workplace makes us a more capable, innovative, and competitive company. We welcome people who represent diversity in their backgrounds, ethnicities, cultures, and experiences. Peak Energy Technologies Inc. is an equal opportunity employer, aiming to reach our company's full potential by cultivating an inclusive workforce. We do not discriminate on the basis of race, color, ancestry, religion, national origin, sexual orientation, citizenship, marital or family status, disability, gender identity or expression, veteran status, or any other legally protected status.