We are seeking a Test and Validation Engineer in our Broomfield, CO location, to help de-risk critical prototype hardware for cryogenic UHV vacuum systems. This hands-on role will work closely with research scientists, system architects, and design/mechanical engineers to build, operate, and analyze cryogenic, ultra-high-vacuum, optical, and electronic test systems. The ideal candidate is comfortable turning ambiguous technical risks into practical test plans, executing those tests in the lab, and using the results to drive design decisions.

Key Responsibilities:

• Work closely with research scientists, system architects, and design engineers to develop and validate new subsystems compatible with cryogenic and ultra-high-vacuum operation.
• Build and operate prototype test apparatus for cryogenic, vacuum, optical, electronic, and mechanical subsystems.
• Develop test plans to de-risk new designs, including defining success criteria, measurement methods, required instrumentation, and data-analysis approaches.
• Analyze test results and synthesize clear conclusions that inform future design iterations and architecture decisions.
• Characterize performance, reliability, and failure modes of complex systems.
• Support rapid prototype testing, troubleshooting, and root-cause analysis in collaboration with design and mechanical engineering partners.
• Provide day-to-day support for AMO physics laboratory operations, including equipment setup, maintenance, documentation, and safe lab practices.
• Document test procedures, results, and recommendations in a clear, reviewable format.

You Must Have:

• Minimum of an associate's degree
• Minimum of 4+ years of direct, hands-on laboratory experience building, maintaining, troubleshooting, and operating electronic systems, complex optical systems, vacuum systems, cryogenic systems, or experimental hardware.
• Due to contractual requirements, must be a U.S. Person, defined as a U.S. citizen, permanent resident or green card holder, or a person granted asylum or refugee status.
• Due to national security requirements imposed by the U.S. Government, candidates for this position must not be a People's Republic of China national or Russian national unless the candidate is also a U.S. citizen.

We Value:

• Bachelor's degree or higher in physics, applied physics, or a relevant engineering field such as mechanical, electrical, optical, aerospace, or systems engineering preferred
• Demonstrated ability to design and execute laboratory tests, analyze data, and communicate technical conclusions.
• Experience with cryogenic systems, ultra-high-vacuum systems, optical systems, RF/electrical test equipment, precision mechanical assemblies, or AMO physics experiments.
• Experience designing test fixtures, prototype assemblies, or validation experiments for complex hardware.
• Strong Python skills for data acquisition, automation, analysis, and visualization.
• Strong organizational and communication skills, including the ability to clearly document test plans, results, and recommendations.
• Ability to think critically, solve ambiguous technical problems, and make sound engineering judgments given uncertain or evolving requirements.
• Strong interpersonal and teamwork skills, with a demonstrated ability to work closely with scientists, engineers, technicians, and program stakeholders.
• Experience performing system audits, checkout procedures, or verification activities to ensure intended functionality, operation, and performance requirements are achieved.

$89,000 - $119,000 a year

Compensation & Benefits:

The pay range for this role is $89,000 - $119,000 annually. Actual compensation within this range may vary based on the candidate's skills, educational background, professional experience, and unique qualifications for the role.

Our global team of more than 800 employees includes many of the world's leading scientists, engineers, and researchers, with more than 70% of our technology team holding advanced degrees at the Master's or PhD level. Headquartered in Broomfield, Colorado, Quantinuum operatesacross the United States, United Kingdom, Germany, Japan, and Singapore.

What's in it for you?

We believe our people are our greatest strength and offer a comprehensive rewards package that supports your professional growth, well-being, and long-term success.

• Competitive compensation and the opportunity to work on groundbreaking technology
• Flexible work arrangements that support work-life balance
• Employer-subsidized medical, dental, and vision insurance
• 401(k) retirement savings plan with company match and student loan repayment benefit
• Equity opportunities
• Generous paid time off, sick leave, and 12 paid holidays annually
• Paid parental leave
• Employee discount programs