Senior Cryostat Engineer

PsiQuantumsmission is to build the first useful quantum computersmachines capable of delivering the breakthroughs the field has long promised. Since our founding in 2016 our singular focus has been to build and deploy million-qubit fault-tolerant quantum systems.

Quantum computers harness the laws of quantum mechanics to solve problems that even the most advanced supercomputers or AI systems will never reach. Their impact will span energy pharmaceuticals finance agriculture transportation materials and other foundational industries.

Our architecture and approachisbased on silicon photonics. Byleveragingthe advanced semiconductor manufacturing industryincluding partners like GlobalFoundrieswe use the same high-volume processes that already produce billions of chips for telecom and consumer electronics. Photonics offers natural advantages for scale: photonsdontfeel heat are immune to electromagnetic interference and integrate with existing cryogenic cooling and standard fiber-optic infrastructure.

In 2024PsiQuantumannounced government-funded projects to support the build-out of our first utility-scale quantum computers in Brisbane Australia and Chicago Illinois. These initiatives reflect a growing recognition that quantum computing will be strategically and economically definingand that now is the time to scale.

PsiQuantumalso develops the algorithms and software needed to make these systems commercially valuable. Our application software and industry teams work directly with leading Fortune 500 companiesincluding Lockheed Martin Mercedes-Benz Boehringer Ingelheim and Mitsubishi Chemicalto prepare quantum solutions for real-world impact.

Quantum computing is not an extension of classical computing. Itrepresentsa fundamental shiftand a path to mastering challenges that cannot besolvedany other way. The potential is enormous and we have a clearpathto make it real.

Come join us.

Job Summary:

PsiQuantum is seeking a highly skilled Cryostat Engineer to lead the installation commissioning and ongoing operation of advanced cryogenic and ultra-high vacuum (UHV) systems supporting quantum computing hardware. This role is critical to ensuring reliable ultra-low-temperature and high-vacuum environments required for quantum device performance.

Responsibilities:

• Lead installation and integration of cryostats and associated subsystems including vacuum chambers pumps valves and instrumentation.
• Execute commissioning procedures including vacuum pump-down leak checking bake-out processes cooldown and system qualification.
• Develop and maintain standard operating procedures (SOPs) for cryostat and vacuum system operation.
• Monitor and optimize vacuum performance (pressure levels leak rates outgassing) alongside cryogenic thermal stability.
• Troubleshoot and resolve issues related to vacuum integrity cryogenics and thermal interfaces.
• Perform helium leak detection residual gas analysis (RGA) and vacuum diagnostics.
• Collaborate with cross-functional teams to integrate vacuum and cryogenic systems with quantum hardware.
• Perform preventive and corrective maintenance on cryostats vacuum systems and supporting infrastructure.
• Maintain detailed documentation logs and test reports for vacuum and cryogenic systems.

Experience/Qualifications:

• Bachelors degree in Mechanical Engineering Physics or a related field (advanced degree preferred).
• 3 years of hands-on experience with cryogenic and/or high or ultra-high vacuum systems.
• Strong understanding of vacuum technology (UHV practices pumping systems sealing methods materials compatibility).
• Experience with vacuum pumps (turbo cryo roughing) gauges and leak detection methods.
• Solid foundation in thermodynamics and heat transfer.
• Experience installing and commissioning complex mechanical and vacuum systems.
• Ability to read and interpret engineering drawings vacuum schematics and P&IDs.
• Strong troubleshooting and problem-solving skills in lab or manufacturing environments.

PsiQuantum provides equal employment opportunity for all applicants and employees. PsiQuantum does not unlawfully discriminate on the basis of race color religion sex (including pregnancy childbirth or related medical conditions) gender identity gender expression national origin ancestry citizenship age physical or mental disability military or veteran status marital status domestic partner status sexual orientation genetic information or any other basis protected by applicable laws.

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