Senior Thermo Mechanical Engineer New

Amperesand, Inc.; San Francisco (CA); On-site; USD 120,000 - 180,000; Full time

Benefits offered by this job

Competitive Salary + Stock Options

Medical, vision, and dental benefits

401k retirement plan

PTO and holidays

Paid parental leave

Job summary

Amperesand is seeking Senior or Staff Thermo‑Mechanical Design Engineers to develop an advanced liquid‑cooling system for its next‑generation medium‑voltage platform. This hands‑on role covers architecture, sizing, CAD design, CFD, and validation, with a focus on manufacturability and production readiness.

You will collaborate with mechanical, electrical, manufacturing, and quality teams to deliver robust cooling solutions for a novel application, with ownership across the thermal system

Qualifications

• 3+ years experience for Senior level; 6+ years for Staff level.
• BS in mechanical engineering; Masters or PhD preferred.
• Liquid‑cooling thermal systems and CAE expertise.
• Hands-on testing and validation experience.

Responsibilities

• Develop the thermal system for production from architecture to mass production.
• Work on architecture and concept selection.
• Model the thermal system performance across operating conditions and mission profiles.
• Detailed design of components, including CAD routing, interconnections, and CFD.
• Partner with manufacturing and quality on DFM/DFA to ensure manufacturability.
• Prototype and validate the thermal system.
• Solve problems from architecture to start of production.

Skills

Thermal design

CAD modeling

CFD analysis

Hands-on testing

Problem solving

Education

BS in mechanical engineering

Masters or PhD a plus

Tools

Catia 3DX

Siemens Amesim

Job description

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.

About the Role

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
• 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.

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.

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.

Compensation will be determined based on experience, location, and other factors permitted by law.

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
• 100% paid maternal leave (12 weeks) and paternal leave (6 weeks)

The benefits outlined below apply to employees located in Singapore:

• Competitive Salary + Incentive Stock Options
• 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
• 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.

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.