FPGA & DSP Engineer (Quantum RF)

Infleqtion UK

Kidlington

Hybrid

GBP 50,000 - 70,000

Full time

14 days+

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Benefits offered by this job

Competitive salary

Unlimited PTO

BUPA healthcare after probation

Generous company pension contribution

Cycle to work scheme

Incentive Stock Option Plan

Job summary

A leading global quantum technology company is looking for a Control Systems Engineer to join their team in Kidlington, UK. This role involves developing and implementing DSP algorithms and FPGA solutions for quantum RF sensors and related technologies. Candidates should have a strong engineering background, proficiency in VHDL or similar languages, and an interest in quantum applications. The position offers a competitive salary, unlimited PTO, and additional benefits including healthcare and pension contributions.

Qualifications

Significant experience in engineering or related field.
Proficiency in VHDL/Verilog/SystemVerilog for DSP algorithms.
In-depth knowledge of digital and RF hardware.

Responsibilities

Collaborate on development of atom-based quantum technologies.
Engineer electronic solutions for subsystems.
Implement real‑time DSP algorithms on FPGA.

Skills

FPGA programming

Digital Signal Processing

Control Systems

Problem-solving

Teamwork

Education

Degree in Engineering or Computer Science

Tools

FPGA development tools

Electrical test equipment

Job description

About the Company

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. Our mission is to commercialise atom-based quantum products that provide orders of magnitude improvements in performance and computing applications.

Location

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

Position Summary

Infleqtion UK is in search of a highly motivated Control Systems Engineer with FPGA and DSP experience, and with a keen interest in joining a diverse, interdisciplinary team dedicated to transcending the boundaries of quantum technology, bringing it from the confines of the laboratory into practical real-world applications. As a Control Systems Engineer, you will employ your analytical and problem‑solving skills to contribute to the design, implementation, and operation of atom‑based quantum technologies, primarily on quantum RF sensors, but also encompassing inertial navigation systems and atomic clocks.

Job Responsibilities

Collaborate seamlessly with a multidisciplinary team to orchestrate the development of atom-based quantum technologies, with a focus on quantum RF sensors and atomic clocks
Engineer electronic solutions tailored for controlling subsystems, such as laser and optical frequency comb drivers, optical and electronic amplifiers, photodetectors, thermal sensors, and RF signal chains
Implement real‑time and pipelined digital signal processing (DSP) algorithms on high‑speed signals within an FPGA including FIR/IIR filters, I/Q frequency mixers, and similar
Write automated test benches to verify designs
Debug complex embedded systems comprising hardware, software (processor) and firmware (FPGA) designs
Create high‑speed interfaces from FPGA to hardware peripherals such as ADCs, DACs, DDS, PLL and other devices
Execute high‑speed feedback control systems (PID and similar) on an FPGA
Collaborate closely with software, electronics and systems engineers to design and realise new FPGA‑based peripherals
Employ precision test and measurement equipment to characterize and test systems
Conduct critical design reviews based on product specifications
Create, document, and maintain designs and architectural blueprints
Effectively manage technical priorities, meet deadlines, and deliver on project objectives

Requirements

Significant experience working in engineering, computer science, or a related field
Proficiency in implementing DSP algorithms, digital transceivers, and control loops on FPGAs using VHDL/Verilog/SystemVerilog
Ability to analyse solutions and make prototype design trade‑offs
Strong desire to dive deep into system‑level issues and drive problems to closure in a team‑based environment with a proactive attitude
In‑depth knowledge and understanding of digital and RF hardware, including its limitations and its impact on system performance
Competence in controlling FPGA IP blocks programmatically via software, through e.g. AXI bus
Proficiency in interfacing with peripheral hardware devices through standard communication protocols such as I2C, SPI, UART, and others
Experience in hardware product development, new product introduction, and familiarity with Product Life Cycle processes
Hands‑on experience with electrical test, verification, and validation of products and subsystems

Desirable Skills or Knowledge

Experience developing with FPGA SoC/SoM devices such as Xilinx Zynq. Experience with Xilinx RFSoCs highly advantageous
Experience in designing for radio frequency products and experience using associated test equipment such as RF signal generators, spectrum analysers, network analysers
PCB design experience (schematic capture, PCB layout, component creation all desirable)
Design experience with C/C++ for embedded systems
Design experience/working knowledge of Python to aid verification and test
Experience with embedded systems programming in C/C++ or Rust
Familiarity with software version control systems such as git
Familiarity with Software‑Defined‑Radio systems
Familiarity with common laser frequency stabilisation methods

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