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Control System Engineer (Quantum Instrumentation - DSP)



Oxford, UK
Posted on Monday, November 20, 2023
Infleqtion delivers high-value quantum information precisely where it is needed. By operating at the Edge, our software-configured, quantum-enabled products deliver unmatched levels of precision and power, generating streams of high-value information for commercial organizations, the United States, and allied governments. With 16 years of ColdQuanta's pioneering quantum research as our foundation, our hardware products and AI-powered solutions address critical market needs in PNT, global communication security and efficiency, resilient energy distribution, and accelerated quantum computing. We currently have offices in Austin, TX; Boulder, CO; Chicago, IL; Louisville, CO; Madison, WI; Melbourne, AU; and Oxford, UK. Learn how Infleqtion is revolutionizing how we communicate, navigate, and discover at


This position is a full-time position and is based in our Oxford, England office.


Infleqtion UK is in search of a highly motivated FPGA Engineer 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, including inertial navigation systems, radiofrequency sensors, and atomic clocks.


The duties and responsibilities outlined below include essential functions of the role. Depending on business needs, this role may perform a combination of some or all of the following duties. Duties, responsibilities, and activities may change, or new ones may be assigned at any time with or without notice.

  • Collaborate seamlessly with a multidisciplinary team to orchestrate the development of atom-based quantum technologies, encompassing atomic clocks and inertial sensing systems
  • Engineer electronic and microsystem solutions tailored for controlling subsystems, such as laser and frequency comb drivers, amplifiers, various photodetectors (e.g., photomultipliers and photodiodes), thermal sensors, heaters, coolers, and RF upconversion/downconversion
  • Implement digital transmit/receive (TX/RX) and real-time digital signal processing (DSP) functions on an FPGA
  • Create high speed interfaces from FPGA to peripherals such as ADC, DAC, DDA, PLL and other high-speed devices
  • Execute high-speed DSP in the loop feedback control systems on an FPGA
  • Collaborate closely with electronics and systems engineers to design and realize FPGA-based peripherals
  • Employ precision test and measurement equipment to characterize and test systems
  • Conduct critical design reviews based on specific product specifications
  • Create, document, and maintain electronic designs and architectural blueprints
  • Effectively manage technical priorities, meet deadlines, and deliver on project objectives


  • 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 or Verilog
  • In-depth knowledge and understanding of digital and RF hardware, including its limitations and its impact on system performance
  • Competence in interfacing FPGAs with system memory and peripherals
  • Proficiency in interfacing with embedded 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 with embedded systems programming in C/C++ or Rust
  • Experience of developing with FPGA SoC/SoM devices


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

  • Competitive salary
  • Unlimited PTO
  • Generous company pension contribution
  • Cycle to work and Technology schemes
  • Incentive Stock Option Plan