technical Staff Software Engineer

Ionq, Inc.; Oxford; On-site; GBP 90,000 - 130,000; Full time

Benefits offered by this job

Stock options

Annual bonus

Hybrid work

Private medical insurance

Dental insurance

Generous annual leave

Job summary

IonQ, Inc. in the UK is hiring a highly technical Staff Software Engineer for the System Orchestration team in Oxford.

You will design and operate the control plane that calibrates quantum systems, schedules programs, and maintains full history of runs to keep quantum computers productive around the clock. This hands-on role requires deep systems engineering, experience with stateful services exposed over gRPC/REST, and a strong bias for deterministic design and observability.

Qualifications

• Deep systems engineering experience building durable, live-data services.
• Strong background in operating stateful networked services at scale.
• Proficiency with gRPC or REST APIs and fault-tolerant design.
• Experience with observability, metrics, tracing and incident response.

Responsibilities

• Own the design and operation of the control plane for calibration and scheduling of quantum programs.
• Ensure data durability, crash recovery, and migrations with live data.
• Improve determinism and reduce latency in the service path with robust engineering solutions.
• Build tooling and test infrastructure to move the fleet faster and more reliably.

Skills

Rust

Systems engineering

Distributed systems

gRPC/REST

Observability

Data durability

Tools

PostgreSQL

Temporal

Airflow

Kubernetes

Job description

We are looking for a highly technical Staff Software Engineer to join our System Orchestration team in System Software at Oxford Ionics. In this role, you will be responsible for building and operating the software that keeps our systems calibrated, decides what they do next and keeps the record of what they did, contributing to the team's mission of keeping our quantum computers running useful work around the clock. The trapped-ion quantum computers we are building will control 10,000 ions within two years, and all of that has to be kept in tune - settings that drift over minutes, hours and days. Without it a computer does not stop; it quietly starts producing invalid output. Calibration routines, scientists' experiments and customer workloads all compete for physical hardware, and our team builds the control plane that arbitrates that: it schedules and prioritises programs, hands exclusive access to one at a time and takes it back cooperatively, streams results while a program is still running, and keeps the record of everything that ran. It runs on every quantum computer in our fleet. Its job is to keep that machine busy and productive: running quantum programs rather than waiting in between, and running them in spec - on a machine still hitting the fidelity it is meant to hit. The ambition is for that to run without a person in the loop: machines that assess their own readiness, call for the calibrations they need, and keep a full history of how they were tuned. You'd work closely with the runtime team who own real-time control, the systems teams who build and maintain our quantum computers, and the operators and scientists who run them. This is a hands‑on engineering role: you would be writing this software alongside our other staff engineers, not directing others who write it. You'll play an important part in shaping the services that support our work in building the world's most advanced quantum systems. Previous exposure to quantum systems is not required.

• Take on the problems that span the whole control plane - the durability and recovery contracts the rest of the design rests on.
  To be successful, you will need deep systems engineering experience, a track record of operating services where losing data is not an option, and the judgement to tell a problem worth solving structurally from one worth patching. We're looking for someone who wants to stay hands‑on in the code at this level and can contribute effectively within a fast moving, highly technical team., Expert systems engineering skills. Our System Orchestration layer is written in Rust, so either solid Rust experience or deep proficiency in another systems language and the appetite to work in a Rust codebase, including async programming.
• Deep experience building and operating stateful networked services in production, exposed over gRPC or REST, with a real grasp of error handling, observability and failure modes.
• A track record with data durability and correctness - persistence design, crash recovery, and migrations against live data you cannot afford to lose. We use PostgreSQL.
• The instinct to reach for determinism when chasing a timing or interleaving bug, rather than for more logging.
• Depth in the scheduling and workflow landscape - Temporal, Hatchet, Airflow, Slurm, Postgres-backed queues - and the judgement to borrow from it rather than reinvent.
• A track record of pinning down failures that others could not.
• A habit of settling design questions in writing, with the options compared as peers.
• Excellent communication skills both within software and across disciplines.

Additional useful experience would include replacing a load‑bearing system while it stays in service, containerised services in production, Kubernetes and declarative deployment, distributed tracing, formal specification or model checking, closed-loop systems that act on measured state, and scientific computing or research facilities.

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.

• Make a machine's own assessment of its readiness something the rest of the control plane can rely on.Do the deep diagnosis of failures that only appear on a live system, under real load.
• Remove whole classes of failure across the fleet, rather than instances of them.
• Draw the boundaries between our services, settle them in writing, and move the code across them yourself.
• Make the correctness of a design demonstrable rather than argued.
• Build the tooling and test infrastructure that let the whole team move faster.
• Evolve how our services are deployed and operated as the fleet grows.
• Raise the bar of everyone around you through the code you write and the reviews you give., Be part of a team that's shaping the future of quantum. We offer more than just a role, you'll join a world class community of scientists, engineers and innovators working to unlock the full potential of quantum computing.

We offer a range of benefits, including opportunities to further your career alongside industry leaders, a competitive salary with IonQ stock options, an annual performance bonus, generous annual leave, flexible hybrid working, private medical and dental insurance for you and your family, and much more. Join us and be part of the future of quantum computing. We're proud to be an equal opportunity employer and welcome applicants from all backgrounds. Compensation will vary based on individual factors such as education, qualifications, and experience of the final candidate(s), specific office location, and calibration against relevant market data and internal team equity. Posted base salary figures are subject to change as new market data becomes available. Our benefits include comprehensive medical, dental, and vision plans, matching 401(k), unlimited PTO and paid holidays, parental/adoption leave, legal insurance, and a home technology stipend. Details of participation in these benefit plans will be provided when a candidate receives an offer of employment. At IonQ, we believe in fair treatment, access, opportunity, and advancement for all while striving to identify and eliminate barriers. We empower employees to thrive by fostering a culture of autonomy, productivity, and respect. We are dedicated to creating an environment where individuals can feel welcomed, respected, supported, and valued.