Staff Engineer - Cryogenics

IonQ, Inc . [NYSE: IONQ] is the world’s leading quantum platform and merchant supplier - delivering integrated quantum solutions across computing, networking, sensing, and security. IonQ's newest generation of quantum computers, the IonQ Tempo, is the latest in a line of cutting‑edge systems that have been helping customers and partners including Amazon Web Services, and AstraZeneca achieve 20x performance results and accelerate innovation in drug discovery, materials science, financial modeling, logistics, cybersecurity, and defense.

In 2025, the company achieved 99.99% two‑qubit gate fidelity, setting a world record in quantum computing performance .

IonQ, Inc . [NYSE: IONQ] is the world’s leading quantum platform and merchant supplier - delivering integrated quantum solutions across computing, networking, sensing, and security. IonQ's newest generation of quantum computers, the IonQ Tempo, is the latest in a line of cutting‑edge systems that have been helping customers and partners including Amazon Web Services, and AstraZeneca achieve 20x performance results and accelerate innovation in drug discovery, materials science, financial modeling, logistics, cybersecurity, and defense.

In 2025, the company achieved 99.99% two‑qubit gate fidelity, setting a world record in quantum computing performance .

Location:

This role will be based onsite at our Boston, MA office.

Travel: 10%, domestic and international.

Job

We are looking for a Staff Cryogenic Engineer for support and developing a cryogenic platform for diamond‑based photonic interconnects between IonQ quantum processors. As a Staff Cryogenic Engineer, you’ll be part of a cross‑functional team whose mission is to lead IonQ on its journey to build the world’s best quantum technologies to solve the world’s most complex problems.

In this role, you will be an integral part of the commercialization process for IonQ’s SiV quantum memories, with applications across quantum computing, networking, and sensing. You will develop and mature cryogenic subsystems for defect‑center based quantum memory nodes. Specifically, this involves engineering R&D‑scale subsystems and processes into robust, reliable elements deployable at other IonQ and/or customer sites, which can be efficiently maintained and/or updated as the technology evolves.

• Customize commercially available cryostats for quantum memory‑specific needs
• Work with vendors to design and configure deployable cryogenic systems
• Work with IonQ internal teams to improve the current cryogenic platforms
• Provide operational support for the current fleet of cryostats

• Masters in physics, applied physics, mechanical engineering, or closely related field
• Experience working in cryo industry for 7+ years
• Experience in designing and evaluating performance of complex cryogenic systems
• Experience with operating and maintaining dilution, sorption, 1K cryostats
• Experience with cryogenic wiring, sensors, and heaters
• Experience with UHV systems in cryogenic environment: pumping, leak detection, sealing and joining techniques
• Experience with CAD systems and manufacturing

• PhD in physics, applied physics, mechanical engineering, or closely related field
• Experience working in cryo industry for 10+ years
• Experience with managing complex production lines
• Experience managing customer projects
• Experience with free‑space or fiber optics
• Experience with working and integration of superconducting magnets

The total compensation package includes base, bonus, equity, and a range of benefit options found on our career site.
Wage Transparency
$152,000 - $190,000 USD
Compensation will vary based on individual factors such as education, qualifications, and…