Controls & Test Engineer Cryogenic Systems

Maybell Quantum is redefining the future of computing. As a venture-backed quantum hardware innovator experiencing rapid growth, we're building technology that will transform industries for decades to come. Quantum computers will be as transformative to the next 30 years as the internet was to the last 30. Our team is creating the hardware foundation to make this revolution possible. 

Maybell Quantum is seeking an experienced Controls & Test Engineer to join our multidisciplinary team and take ownership of embedded controls, system automation, and testing workflows. Our ideal team member can excel in a fast-paced hardware-based startup environment. 

Responsibilities 

This role combines real-time controls, embedded software, and hands-on cryogenic test work. You will design and implement robust control systems for thermal and fluid hardware, while contributing to system integration, diagnostics, and performance verification. 

• Design and program embedded systems for active thermal control, diagnostics, and telemetry 


• Develop closed-loop control algorithms (e.g., PID for temperature/pressure regulation) 


• Create and maintain SCADA or HMI interfaces for system monitoring and control 


• Design circuits for sensor integration, heater actuation, valve control, and interlock logic 


• Capture and analyze test data; contribute to system performance optimization and root-cause analysis 


• Support troubleshooting and validation of prototype hardware in a lab environment 


• Maintain documentation for testing, data logs, and failure analysis 


• Work closely with the broader design team to integrate sensors, actuators, and control logic into the overall system architecture, ensuring the final product meets performance and reliability targets 

Basic Qualifications 

• Degree in Electrical Engineering, Mechanical Engineering, Physics, or related field 


• 3+ years of hands-on experience with embedded control systems 


• Experience integrating sensors and actuators into system designs 


• Familiarity with Python or C/C++ for embedded development 


• Strong troubleshooting skills with electronics and controls software 

Preferred Qualifications 

• Proficiency in PID control loop design for thermal/fluid systems 


• Understanding of thermodynamic systems 


• Experience with cryogenic systems such as dilution refrigerators, ³He systems, or pulse tubes 


• Familiarity with DAQ hardware and software 


• Experience with high voltage wiring 


• Electrical panel design to UL/NFPA/ATEX codes 


• Comfort working with vacuum systems, cryostats, or experimental thermal equipment 

Additional Information 

• Maybell Quantum is a small, fast-paced team; adaptability and interdisciplinary thinking are valued 


• This position is based on-site in Denver with opportunities for field commissioning support 

What We Offer 

• Base Salary: Salary range of $95k-$130k depending on experience and qualifications, eligible for overtime pay, with additional compensation in equity and bonus 


• Comprehensive Benefits: Health, dental, and vision insurance, 401(k) matching, flexible PTO policy, and more 


• Growth Trajectory: Significant opportunities for professional development and career advancement in a rapidly scaling organization 


• 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 

Maybell Quantum is solving incredibly challenging problems at the cutting edge of physics and engineering. Don’t meet every single requirement?  We are dedicated to building a diverse, inclusive, and authentic workforce, so if you’re excited about this role but your experience doesn’t aligned perfectly, we still encourage you to apply.

At this time we are not able to provide Visa Sponsorships.