Senior Thermo Mechanical Engineer
- Location
- San Francisco, CA
- Listed
- Today
Role Summary
Amperesand is looking for a Senior or Staff level Thermo-Mechanical Design Engineer to develop an advanced liquid-cooling system for its next-generation medium-voltage solid-state power conversion platform. This is a hands-on role where you'll develop the thermal system through architecture and concept selection, system sizing and modeling, CAD and detailed design, thermal CFD simulation, coolant and airflow routing, design for manufacturing and assembly, thermal system validation, and troubleshooting.
You'll work closely with mechanical, electrical, manufacturing, quality, suppliers, and factory teams to design, develop, and build the best system for a novel application, solve problems that don't have established answers, with the opportunity to own thermal design. Thermal performance is critical to the overall performance of our solid-state power converter and a key differentiator for Amperesand.
We are looking for someone with deep expertise in thermals, system modeling and simulation, detailed design experience, and a track record of complex technical work and solving novel problems. We are not looking for someone who simply executes to a defined specification. The role can be based in Reno, San Francisco, or the South Bay.
What You'll Do
- Develop the thermal system for Amperesand's solid-state power conversion platform from architecture into mass-production.
- Work on architecture and concept selection.
- Model the thermal system performance across our operating conditions and mission profiles.
- Detailed design of the thermal system components, including 3D and 2D CAD of structures, coolant routing, interconnections, and thermal CFD.
- Partner with the manufacturing and quality teams on DFM/DFA activities to ensure the thermal system design is manufacturable.
- Prototyping and validation of the thermal system.
- Problem solving anywhere and everywhere between architecture and start of production.
What You'll Bring
- Years of experience: 3+ for Senior level, 6+ for Staff level
- BS in mechanical engineering or a closely related field, Masters or PhD are a plus
- Liquid-cooling thermal system and mechanical design experience, CAE expertise
- Compressor-loop refrigeration system experience
- Demonstrated ability to deliver a thermal system and solve novel engineering problems
- Hands-on testing and validation experience
Nice to Have
- Experience with Catia 3DX
- Experience with Siemens Amesim or similar
- Familiarity with high-voltage design
How We Work
Employment Type
- Full-time
Location: San Francisco/
Work Model
- Onsite
Travel Requirements
Travel to the factory in Reno during builds will be required, ~20% for 1-2mo/yr
Onsite Collaboration Rationale
Given the highly collaborative and cross-functional nature of hardware, embedded systems, and product development, in-person partnership across engineering and product teams is critical to enabling rapid execution, technical alignment, and successful development outcomes.
Pay Disclosure & Benefits
Compensation will be determined based on experience, location, and other factors permitted by law.
Benefits
The benefits outlined below apply exclusively to employees located in the United States:
- Competitive Salary + Incentive Stock Options
- Medical, vision, and dental benefits for employees and their dependents, effective from the start of hire
- Company paid Basic Life, AD&D, short-term and long-term disability insurance
- 401k retirement savings plan through Empower
- Employees receive paid time off (PTO), paid sick days, and paid company holidays
- Commuter Benefits
- 100% paid maternal leave (12 weeks) and paternal leave (6 weeks)
Benefits
The benefits outlined below apply to employees located in Singapore:
- Group medical, hospitalisation and surgical insurance, outpatient or GP coverage, group term life, dental and personal accident insurance
- Employer and employee Central Provident Fund contributions in accordance with the CPF Act (for Singapore Citizens and Permanent Residents)
- Annual leave, paid sick leave, hospitalisation leave, and all Singapore public holidays, in line with or exceeding the Employment Act
- Commuter Benefits
- Government-paid maternity, paternity, shared parental, and childcare leave in accordance with prevailing Singapore statutory entitlements
Additional benefits may be available depending on the role and employment type. Benefits are subject to the terms of applicable company policies and plans.
Candidate Confidentiality & Information Protection
As part of our commitment to protecting confidential and proprietary information, candidates should not disclose or provide Amperesand with any confidential, proprietary, or trade secret information belonging to a current or former employer or any other third party during the application or interview process.
Please do not submit or present employer-owned source code, schematics, designs, technical documentation, internal presentations, customer information, prototypes, or other confidential materials. Candidates should discuss their experience and accomplishments at an appropriate level and use only information and materials they are authorized to share.
Company Overview
Amperesand is reinventing how the world powers its most critical systems.
We are facing a once-in-a-generation opportunity for infrastructure disruption. Electricity demand is skyrocketing, driven by AI factories, electric vehicles, and modern industrial growth. Energy supply is shifting to incorporate a more diverse mix of resources - including solar, gas, and batteries - at a massive scale.
And yet the power infrastructure behind our latest mega-projects hasn't meaningfully changed in nearly 100 years. Supply chains for today's infrastructure equipment can't match the pace and sophistication of critical energy projects. Amperesand is building hardware and software that rewrites this broken power infrastructure playbook to support a new era of energy abundance.
We've built a new class of intelligent, software-defined power infrastructure products leveraging a decade of advanced medium voltage Solid State Transformer research that's now ready for commercial deployment.
Our products and solutions go far beyond the capabilities of traditional electrical equipment. We make power systems that are faster to deploy, dramatically smaller and more efficient, and capable of supporting modern, dynamic energy needs for tomorrow's most demanding energy consumers.
Scalable in-house advanced manufacturing capability is our foundation for meeting timeline and quality expectation to serve infrastructure customers around the world.
Amperesand is led by breakthrough energy hardware development veterans and funded by top tier investors who share our vision of building a category-defining energy technology company.
With hubs in San Francisco, Reno, and Singapore, our global team is laser focused on building foundational technology to solve the most pressing problems in power infrastructure at scale.
Join us in building the power foundation of the future!
About Amperesand
[Standard company overview - maintained by Talent Acquisition / Marketing]
Amperesand is building next-generation power infrastructure systems for Data Centers, EV charging platforms, and future energy applications. Our systems combine advanced power electronics, embedded controls, and scalable energy architectures to rethink how power is converted, controlled, and deployed.
Why Join Amperesand
- Work on next-generation power infrastructure systems
- High ownership and visibility
- Cross-functional collaboration
- Opportunity to shape future products and infrastructure
- Fast-moving startup environment
Please note: This role requires working on-site 5 days a week. We do not offer hybrid or remote options.
While this role is listed for the location above, we may consider candidates in other locations on a case-by-case basis.
Why Join Amperesand
- High ownership and visibility
- Cross-functional collaboration
- Fast-moving startup environment
Equal opportunity and legal notices
Amperesand 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.
Amperesand is also committed to working with and providing reasonable accommodations to individuals with disabilities. Please let your recruiter know if you need an accommodation at any point during the interview process.
From Amperesand's careers page, first listed on Rolev.ai on November 14, 2026. Rolev.ai is not the employer.
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Common questions
Where is the Senior Thermo Mechanical Engineer job at Amperesand located?
This Senior Thermo Mechanical Engineer position at Amperesand is located in San Francisco, CA. Always check Amperesand's application page for specific state eligibility or relocation policies.
How do I apply for the Senior Thermo Mechanical Engineer position at Amperesand?
This listing links directly to Amperesand's Greenhouse application page. You can apply directly on Amperesand's site, or use Rolev.ai to check your resume fit, generate a zero-hallucination tailored resume and cover letter for this posting, and autofill the Greenhouse application form in 1 click with the Rolev.ai Chrome extension. You always review the form and press Submit yourself.