Mechanical Design Engineer (Systems)

At Arbor, we’re creating technology to power our lives while protecting the planet that sustains them. Our advanced power systems deliver clean, reliable baseload electricity with zero operating emissions—modular, fuel-flexible, and engineered for the realities of today’s energy demand. At the core is a supercritical CO₂ turbine with integrated carbon capture, designed to bring carbon-neutral power online quickly at meaningful scale. 

Our team includes aerospace engineers, combustion experts, and systems thinkers with a shared goal: to build technology worthy of the world we want to live in. While many of us began our journeys looking to the stars, we’re applying that expertise here at home to deliver dependable, emission-free baseload power and a future of lasting abundance.  

If you’re drawn to rigorous work with lasting impact, we’d love to hear from you. Come build what the future will run on. 

We are seeking a Mechanical Design Engineer to design, develop, and oversee mechanical and electro-mechanical systems. In this role, you will use FEM software, CAD tools, and hand calculations to create and refine designs, generate technical drawings, and lead skilled technicians in building and testing systems. The ideal candidate has experience with hazardous systems, control systems, and industry standards like ASME and AISC.  

• Own the development of multiple mechanical and electro-mechanical systems  
• Use FEM software and hand calculations to design and build mechanical systems for energy generation.  
• Create drawings and work instructions for system design and construction.  
• Collaborate with and guide technicians in building and testing mechanical systems.  
• Improve and refine the mechanical systems under your responsibility. 

• Bachelor’s degree in Mechanical or Aerospace Engineering.  
• 3 years of experience as a mechanical engineer.  
• Proficiency in CAD software (Siemens NX preferred). 
• Must work on-site at headquarters in El Segundo, CA.  
• Willing to travel (up to 20%) to the test site in San Bernardino, CA for operational activities and builds. 

• Experience working with hazardous systems (high pressure, high energy, hazardous gases/fluids).  
• Experience using ANSYS or similar finite element analysis tools.  
• Knowledge of control systems for remote operations and instrumentation feedback.  
• Familiarity with engineering standards such as ASME B31.3, ASME BPV Code Section VIII, and AISC 360. 
• Experience with root cause analysis.  
• Ability to prioritize and perform well under pressure.  
• Strong communication and presentation skills. 

• Stock options
• Medical, dental, and vision insurance (Arbor covers 90% for employees)
• Basic life insurance fully covered
• Health savings account (HSA) with matching
• Flexible savings account (FSA)
• Unlimited PTO  
• 12 company holidays, including Earth Day!  
• 401(k)
• Commuter benefits
• Annual learning and development stipend
• And more!

Arbor is proud to be an equal opportunity employer. We evaluate qualified applicants without regard to race, religion, national origin, gender identity or expression, sexual orientation, age, marital or veteran status, disability, or any other protected characteristic under applicable law. Solving global energy challenges requires a wide range of perspectives and experiences, and we are committed to building a team that reflects the world we serve.

Salary : $130,000 - $150,000