Systems Integration Engineer - Compute

Infleqtion is a global quantum technology company solving the world’s most challenging problems. The company harnesses quantum mechanics to build and integrate quantum computers, sensors, and networks. From fundamental physics to leading edge commercial products, Infleqtion enables “quantum everywhere” through our ecosystem of devices and platforms.

LOCATION

Infleqtion has offices in the USA, United Kingdom and Australia. This is a permanent, full-time position at our Kidlington, Oxford office. Our flexible working policy enables all full-time employees to work from home up to 2 days a week, if work permits.

POSITION SUMMARY

As part of our continued growth in the UK, we are expanding our Engineering Team and recruiting a Systems Integration Engineer.

In this role, you will help build and deploy the next generation of our quantum computing systems, integrating RF, optical, electronic, and third-party devices with our advanced control systems. You will work across multiple engineering disciplines to bring complex subsystems together into reliable, high-performance systems.

This is an opportunity to contribute directly to the development of ground-breaking quantum technologies with the potential to transform computing and solve some of the world’s most challenging problems.

JOB RESPONSIBILITIES

Technical Responsibilities

• Integrate electronics devices, instruments, third-party devices, and subsystems into larger complex systems comprising RF, analogue, digital, optical, and mechanical elements.
• Translate system-level requirements into practical integration architectures, interfaces, cabling, power, communications, and control schemes.
• Develop system interconnects including cable assemblies, harnesses, RF connections, grounding, shielding, power distribution, and signal routing.
• Perform system bring-up, commissioning, troubleshooting, fault isolation, and performance optimisation.
• Identify and resolve integration issues including grounding, EMI/EMC, signal integrity, timing, communications, power distribution, and environmental effects.
• Develop and maintain system diagrams, interface control documentation, wiring diagrams, integration procedures, and configuration records.
• Define and execute integration, verification, and validation test plans at subsystem and system level.
• Use laboratory test and measurement equipment to diagnose system-level performance and integration problems.
• Support installation, deployment, commissioning, and maintenance of systems in laboratory and operational environments.
• Work closely with electronics, software, FPGA, mechanical, optical, physics, and systems engineering teams to ensure successful end-to-end integration.
• Support supplier selection and integration of third-party equipment and externally developed subsystems.
• Contribute to system risk management, failure analysis, reliability improvement, and continuous improvement activities.

Personal and Team Responsibilities

• Collaborate effectively with team members to ensure deadlines are met

• Work within multi-disciplinary teams including physicists, engineers, and technicians to develop solutions

• Adapt to changing circumstances and manage ambiguity effectively

Requirements

• Bachelor’s degree or substantive equivalent experience in electrical engineering, systems engineering, electronic engineering, physics, mechatronics, or a related technical discipline.
• Several years of relevant and progressive experience integrating complex multidisciplinary hardware systems.
• Strong practical understanding of analogue, digital, RF, power, grounding, shielding, and signal integrity principles.
• Experience integrating PCBs, embedded systems, instruments, sensors, actuators, and third-party equipment into larger systems.
• Experience with system bring-up, commissioning, troubleshooting, and fault isolation.
• Experience developing and interpreting system block diagrams, wiring diagrams, interface specifications, and technical documentation.
• Experience with electrical interfaces and communications protocols such as Ethernet, serial, SPI, I2C, CAN, USB, or similar.
• Experience designing or specifying cabling, connectors, harnesses, grounding, shielding, and power distribution.
• Experience with testing, verification, and validation of complex systems and subsystems.
• Experience using test and measurement equipment such as oscilloscopes, spectrum analysers, network analysers, signal generators, power meters, and digital multimeters.
• Ability to diagnose issues across multiple engineering disciplines rather than within a single subsystem.
• Ability to work effectively within highly collaborative, multidisciplinary engineering teams.

Desirable Skills and Knowledge

• Experience integrating RF systems including amplifiers, mixers, oscillators, filters, attenuators, and frequency conversion equipment.
• Experience integrating optical or electro-optical systems including lasers, photodetectors, modulators, and optical control hardware.
• Experience with precision analogue electronics, low-noise systems, and high-resolution data acquisition.
• Experience with FPGA-based and embedded control systems.
• Experience integrating laboratory automation and instrumentation using software interfaces such as SCPI, serial communications, Ethernet, or APIs.
• Familiarity with EMI/EMC design and troubleshooting.
• Experience designing systems for long-term stability and operation under varying environmental conditions.
• Experience with rack-mounted systems, equipment enclosures, thermal management, and power distribution.
• Experience commissioning complex scientific, industrial, or quantum technology systems.
• Experience solving complex multidisciplinary problems in highly technical and scientific environments.

TRAVEL

Up to 10% travel, including international travel, may be required

WORKING CONDITIONS & PHYSICAL REQUIREMENTS

Work will normally be performed in an office and laboratory environment. Able to efficiently use automated office equipment such as laptops, copiers, and printers; able to effectively engage in communications (via phone, computer, or in-person). Will involve sitting, standing, walking, lifting, and carrying up to 10 kg.

EQUAL OPPORTUNITY

Regardless of your interest in the quantum industry, you can take pride in the fact that Infleqtion is building an ecosystem of quantum technologies and commercial products, driving the industry towards the future. Studies reveal that while men apply for jobs when they meet an average of 60% of the requirements, women and other groups tend to apply only when they meet all the criteria. If you believe you have the potential but don't meet every single point in our job advertisement, please don't hesitate to contact us! We would love to chat with you and see how you could bring great value to our team. Our goal is to find exceptional individuals who can enrich our team culture, actively contribute, and have a genuine passion for their work. Here you have freedom to embrace your whole self: who you love, your gender identity and expression, skin colour, age, appearance, disability, neurodiversity, DNA, military/veteran status, citizenship, and other factors that make up who you are. Your uniqueness is valued, welcomed, and appreciated here. We are dedicated to providing a positive workplace and base all employment decisions on your qualifications, performance, merits, as well as business needs. We are proud to be an Equal Employment Opportunity Employer.

Benefits

In addition to your base compensation, we offer a generous Total Rewards program which includes:

• Competitive salary

• Unlimited PTO

• Generous company 10% pension contribution regardless of employee contribution

• Cycle to work scheme

• Tax efficient technology schemes

• Incentive Stock Option Plan

• BUPA Private Healthcare Insurance once probationary period is successfully completed