Staff Mechanical Design Engineer, Power Electronics

Stormentum Inc; Austin (TX); On-site; USD 120,000 - 180,000; Full time

Benefits offered by this job

Medical, dental, vision

401(k)

Flexible time off

Paid holidays

Equity

Job summary

Stormentum Inc. is seeking a Staff Mechanical Design Engineer to prototype and scale power electronics hardware for AI data centers, EVs, and microgrids. You’ll own the design from concept through production, optimizing thermal, electrical, and packaging performance while coordinating with multi-disciplinary teams.

This hands-on role demands strong fundamentals, external partner management, and a track record of delivering robust hardware in fast-moving startup contexts.

Qualifications

• Bachelor's degree in mechanical engineering or related field.
• 8+ years hands-on mechanical design in power/energy hardware.
• Experience taking products from concept to production.
• Packaging high-voltage systems (400V+) experience.
• Strong first-principles thinking and problem solving.
• Prototyping and test setup with custom fixtures.

Responsibilities

• Lead mechanical design with external hardware development partner and manage deliverables.
• Integrate mechanical for data center and microgrid power systems and test infra.
• Develop test plans, prototypes, and validation strategies for rapid tech maturation.
• Run multi-physics simulations for thermal, structural, and fluid performance.
• Design electro-mechanical components like heatsinks, manifolds, busbars.
• Address packaging, creepage, EMI, vibration, and enclosure requirements.
• Identify improvements to raise power density and enable automated manufacturing.
• Create cost models and guide manufacturing process choices.
• Collaborate with electrical, magnetics, controls, and manufacturing teams.
• Produce complete drawings, manufacturing instructions, and assembly docs.

Skills

Power electronics

Mechanical design

Thermal analysis

CFD

Prototype development

Vendor management

Education

Bachelor's in Mechanical Engineering

Master's preferred

Tools

SolidWorks

Creo

NX

CATIA

ANSYS

STAR-CCM+

Job description

Who We Are

Stormentum builds power infrastructure for AI data centers, EV charging, and microgrids. Our patented, modular power electronics architecture merges UPS, battery, and rectifier stages into one platform, from grid to GPU, with fewer conversion stages and more compute from every megawatt. Founded by executives with decades of leadership across technology, wireless, and energy, we’re bringing together world‑class engineering talent to rethink how power is delivered.

About the Role

Power, not compute, is quickly becoming the limiting factor for AI. As a Staff Mechanical Design Engineer at Stormentum, you'll design the hardware that converts, stores, and delivers energy to data centers and microgrids at the density, cost, reliability, and scale that AI training and inference require. You'll push voltage, power density, thermal performance, insulation, and manufacturability on products that don't exist yet, then carry them into production.

As our first mechanical engineer, you'll identify the highest-impact mechanical bets in power electronics and drive them from concept through prototype, validation, and scalable manufacturing. The work is deeply multidisciplinary, drawing on statics and dynamics, fluids and thermals, and mechanics and vibration, with enough electrical, magnetic, and materials understanding to make system‑level tradeoffs alongside our electrical, magnetics, controls, and manufacturing teams.

This is a hands‑on, prototype‑first role where you'll own problems end to end in a fast‑moving startup.

What You'll Do

• Serve as the mechanical lead with our external hardware development partner, defining requirements, reviewing designs, and holding deliverables to schedule and quality

• Support mechanical integration for novel data center and microgrid electrical distribution systems, including third‑party and internally developed power electronics, as well as mechanical, thermal, and electrical test infrastructure

• Develop engineering test plans, prototype builds, and validation strategies that move new technologies quickly from concept to high‑volume production, improvising test setups as needed and running on‑site test campaigns at outside labs

• Run multi‑physics simulations and optimizations (thermal, CFD, structural) to refine designs against performance, thermal, structural, and environmental requirements

• Own the modeling and design of electro‑mechanical components such as heat sinks, cold plates and manifolds, high‑current busbars and interconnects, insulation systems, magnetic elements, and custom PCBA components

• Solve packaging challenges across air and liquid cooling, high‑voltage creepage and clearance, EMI, vibration, enclosure ratings, and structural and seismic requirements

• Identify and prioritize mechanical technology improvements that increase power density, raise voltage capability, lower cost, and enable automated manufacturing, and set the metrics and targets that track progress

• Build cost models and trade studies that guide manufacturing process choices and keep designs cost‑effective from concept through production

• Work closely with electrical, magnetics, systems, controls, and manufacturing engineers to fit designs into the broader architecture, weighing system‑level tradeoffs in efficiency, reliability, and deployability

• Produce complete drawing packages, manufacturing instructions, and assembly processes that support both rapid prototyping and scalable production

What You'll Bring

• Bachelor's degree in Mechanical Engineering; Master's degree preferred

• 8+ years of hands‑on mechanical design experience in power electronics, energy systems, or industrial high‑power hardware, with a strong record of bringing new products from development into production

• Minimum of two full product development cycles taking distinct hardware products from concept to market

• Hands‑on experience packaging high‑voltage power electronics at 400 V and above, such as 480 VAC three‑phase or 800 to 1000 VDC systems

• Strong first‑principles thinking, with a track record of practical, resourceful solutions to complex mechanical and thermal challenges

• Hands‑on experience building and testing prototypes, including custom fixtures and test setups

• Multi‑physics simulation (thermal, CFD, structural) and cost modeling experience

• Experience managing external engineering partners, suppliers, or contract manufacturers

• Broad knowledge of manufacturing processes, including injection molding, stamping, die‑casting, dispensing, fastening and joining, and automated assembly, along with familiarity with PCBAs and their components

• Solid mechanical engineering fundamentals, including GD&T, finite element analysis, and design for reliability

• Proficiency with tools such as SolidWorks, Creo, NX, or CATIA, plus ANSYS, STAR-CCM+, MATLAB, or Python

• Working knowledge of environmental, safety, and industry standards for energy and industrial products, along with basic electrical and magnetic design principles

• Ability to travel for extended on‑site testing at outside labs

What Will Make You Stand Out

• Industrial power hardware experience, such as utility‑scale inverters, industrial drives, or battery energy storage power conversion systems

• Data center power or thermal hardware experience, such as 480V server rack power systems, PDUs, or liquid‑cooled power conversion

• Packaging for rack‑level systems, containerized systems, medium‑voltage cabinets, or skids, from tens of kilowatts to megawatt scale

• Experience designing to UL 62368‑1, UL 1973, or UL 9540, and familiarity with rack standards such as EIA‑310 and OCP Open Rack

• Early‑stage startup experience

Compensation and Benefits

We offer a competitive compensation package including base salary and equity. Benefits include medical, dental, vision, life insurance, 401(k), flexible time off, and paid holidays.

Equal Opportunity Employer

Stormentum is an equal opportunity employer and complies with all applicable federal, state, and local fair employment practices laws. All qualified applicants will receive consideration for employment without regard to race, color, religion, national origin, ancestry, sex, sexual orientation, gender, gender expression, gender identity, genetic information or characteristics, physical or mental disability, marital/domestic partner status, age, military/veteran status, medical condition, or any other characteristic protected by law.

We’re committed to providing reasonable accommodations to individuals with disabilities. Please let your recruiter know if you need an accommodation at any point during the interview process.

Third Party Agencies

Stormentum does not accept unsolicited resumes from third‑party agencies or recruiters and will not pay fees for any unsolicited submissions.