Senior Mechanical Engineer, Reliability

Entangled Future; Oxford; Hybrid; GBP 70,000 - 110,000; Full time

Job summary

IonQ, based in Oxford, England, is seeking a Senior Mechanical Engineer for the Reliability Engineering team. You will maintain the live quantum computer fleet, diagnose mechanical, vacuum, cryogenic and thermal faults, and collaborate with electrical, optical and science colleagues to implement improvements.

The role focuses on uptime and cost optimization in a cutting-edge, fast-moving environment. As part of the Oxford Ionics unit now under IonQ, you will drive robust mechanical designs,

Responsibilities

• Root-cause mechanical, vacuum, cryogenic and thermal faults on running systems.
• Prioritise issues by their impact on uptime and analyse failed parts to track recurring failure modes.
• Design, prototype and test solutions when a challenge recurs; write assembly and upgrade instructions.

Job description

Senior Mechanical Engineer, Reliability at IonQ, Oxford, England, United Kingdom. A senior-level full time position in the Compute - Engineering team, listed under business operations.

About IonQ: 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 . Headquartered in College Park, Maryland, IonQ has operations in California, Colorado, Massachusetts, Tennessee, Washington, Italy, South Korea, Sweden, Switzerland, Canada, and the United Kingdom. Our quantum computing services are available through all major cloud providers, while we also meet the needs of networking and sensing customers across land, sea, air, and space. IonQ is making quantum platforms more accessible and impactful than ever before. Role Overview Role: At Oxford Ionics, now part of IonQ, we are building the first practical quantum computer. As a Senior Mechanical Engineer on the Reliability Engineering team, You'll keep our quantum computers running at their best, boosting fleet uptime and cutting operating cost. You'll work closely with electrical, optical and science colleagues as part of a supportive, collaborative team, updating mechanical designs and managing configuration so their system improvements can land. Responsibilities: Your focus will be the live fleet. You will root-cause mechanical, vacuum, cryogenic and thermal faults on running systems, prioritise issues by their impact on uptime, and analyse failed parts to track recurring failure modes. Where a challenge keeps coming back, you will design, prototype and test the solution, then write the assembly and upgrade instruct