Cryogenics Engineer

About Us 

Maybell Quantum is building the hardware foundation of the quantum era. Our redesigned dilution refrigerator gives labs more fridges per room, more experiments per fridge, and a level of reliability and usability the field has never had. We are a fast-growing, venture-backed team of scientists and engineers, and the cryogenic systems we design in Denver ship to leading quantum computing groups around the world. 

We are seeking a Cryogenics Engineer totest, validate,troubleshoot, andrefineour productsand the subsystemsthat comprisethem.You will work alongside our R&D scientists, mechanical and electrical engineers, and manufacturing team toelevateour products, drive customer success from installation through long-term operation, and deliver an exceptional customer experience. 

What You'll Do 

Test, Validate,&Iterate 

•  Develop Test Plans:Buildcomprehensiveexperiments that push ourproducts to the limitto ensurethe highest quality standards—and tofind ways for “the best toperformeven better.” 

• OperateandTroubleshoot: Become the equivalent of a “test pilot” for the most advanced cryogenic systems in the world, with a heavy focus on evaluatingthe user experience andrisks to uptime.  

• DriveInnovation:Work with our product and engineering teamsto refine our platforms’ designs based on yourtests and discoveries. 

Support our Customer Success Team 

• Support Global Operations:Partner with our customers toroot-cause and solve issues, allowing them to achieve the next breakthrough in quantum computing.Occasionally travel on sitetoassist whenrequired. 

• Build our Customer Success Infrastructure:Document test, and inspection procedures to ensure a common standard across the company and the highest level of customer support. 

Safety & Standards 

• Engineer for Safety: Apply pressure-safety, relief-sizing, and oxygen-deficiency hazard practices to systems that handle helium-3/helium-4 mixture, liquid nitrogen, and high vacuum. 

Who You Are 

Required: 

• Bachelor's degree (or higher) in mechanical engineering, physics, oran equivalent technical field. 

• 3+ years of hands-on experience designing, building, oroperating cryogenic systems. 

• Strong grounding in heat transfer, thermodynamics, and fluid mechanics at cryogenic temperatures, including low-temperature material properties. 

• Hands-on experience with high-vacuum systems and helium leak detection. 

• Experience safely handling cryogens such as liquid nitrogen and liquid helium. 

• Proficiency in 3D CAD (SolidWorks preferred) and analysis tools such as Python, MATLAB, or ANSYS. 

• Strong written and verbal communication skills. 

• Self-starter who can drive results independently in a fast-moving environment. 

• Able to work on-site in Denver, CO. 

Preferred: 

• Experience designing, building, or significantlymodifying dilution refrigerators or other sub-kelvin systems (ADRs, helium-3 systems). 

• Master's degree or PhD in a relevant field. 

• Experience with helium-3/helium-4 gas-handling systems. 

• Experience with brazing, welding, indium seals, or other cryogenic joining and sealing methods. 

• Background in quantum computing, scientific instrumentation, or superconducting hardware. 

• Experience with pressure-system design under ASME or equivalent codes. 

• Experience in a high-growth, venture-backed startup. 

What We Offer 

• Base Salary: $90,000 – $120,000/yr, depending on experience and qualifications, plus equity and performance bonus. 

• Benefits: Medical, dental, and vision insurance; 401(k); paid time off and paid holidays  

• Impact: Direct influence on the success of a company developing revolutionary technology. 

• Exceptional Team: Collaboration with world-class scientists, engineers, and business leaders who are defining a new industry.