We are looking for a highly skilled Mechanical Design Engineer to join our team. This role involves leading the design and development of ceramic, refractory, steel, and insulation assemblies, as well as the mechanical integration of instrumentation and cable routing into the system.  The ideal candidate combines deep technical expertise with hands-on experience bringing complex mechanical designs from concept to production. 

What You’ll Do (responsibilities include but are not limited to): 

• Design components, assemblies, and systems — including ceramic, refractory, steel, and insulation parts — that are cycled and maintained at high temperatures up to 1500°C 

• Conduct FEA and 1D thermal and fluid-flow analysis to confirm mechanical performance and correlate against test data; contribute to FMEA activities to identify and mitigate failure risks 

• Drive rapid prototyping and fast build-test-learn iteration cycles to quickly validate designs and accelerate maturity 

• Apply GD&T principles and tolerance stack-up analysis to critical features 

• Specify and mechanically integrate high-temperature measurement devices and other sensors into the assembly — including mounting, thermal/electrical isolation, and cable routing — in collaboration with electrical and controls engineers 

• Utilize CAD and PLM software (SolidWorks preferred) for design, documentation, and configuration control 

• Formulate subsystem requirements and prepare documentation for external suppliers and stakeholders 

• Lead and participate in design reviews, schedule estimation, and progress reporting to cross-functional teams 

What You’ll Bring: 

• Bachelor’s or Master’s degree in Mechanical Engineering or related discipline 

• 3–5 years of mechanical design engineering experience, taking designs from concept through production 

• Proficiency in FEA and 1D thermal analysis; CFD experience a plus 

• Strong fundamentals in GD&T and tolerance stack-ups 

• Design experience with high-temperature materials and thermal-mechanical systems strongly preferred 

• Strong communication and collaboration skills 

Bonus Points! 

• Hands-on instrumentation, cable/harness design experience 

• Experience in a construction environment 

This role is required to be on-site at our Alameda Headquarters with up to 10% travel to project sites. The estimated annual salary range for this role in the San Francisco Bay Area is $140,000 - $160,000 and it would be eligible for Rondo’s excellent benefits, plus additional compensation in the form of equity. Please note that some pay bands may have wide ranges of compensation to accommodate candidates’ diverse sets of skill levels and experience. 

About Rondo Energy 

We are transforming industrial decarbonization with our innovative Rondo Heat Battery technology. Rondo is deploying low-cost, zero-carbon Rondo Heat Batteries to accelerate the deployment of renewable energy and to significantly decarbonize industrial processes that are commonly thought of as “difficult-to-decarbonize”. Our heat batteries charge from intermittent renewables to provide high temperature, continuous heat for customers safely, reliably, at an unprecedented 98% efficiency — and at a cost point that is lower than any other method. 

Our technology is designed to replace fossil-fired boilers. By enabling industries to adopt renewable energy without costly factory changes, we are accelerating the transition to a sustainable future. With over $160 million in funding and partnerships across critical industrial sectors, Rondo is scaling rapidly to meet global demand. 

Rondo Energy is an equal opportunity employer. We strive to create a supportive and inclusive workplace where contributions are valued and celebrated, and our employees thrive by being themselves and are inspired to do their best work. We seek applicants of all backgrounds and identities, across race, color, ethnicity, national origin or ancestry, citizenship, religion, sex, sexual orientation, gender identity or expression, veteran status, marital status, pregnancy or parental status, or disability. Applicants will not be discriminated against based on these or other protected categories or social identities. 

Rondo is committed to the full inclusion of all applicants. If reasonable accommodation is needed to participate in the interview process, please let our recruiting team know. 

We proactively work to design hiring processes that promote equity and inclusion while mitigating bias.