Job Description

Flux Computing designs and manufactures optical processors to train and run inference on large AI models. Join us in London to be part of a highly motivated and skilled team that thrives on delivering impact and innovation at speed.

The Role

We are seeking highly skilled and motivated Senior/Staff Digital Design Engineers with a strong focus on CMOS digital design to take

end?to?end ownership of high?speed, real?time data?processing silicon

--from early algorithm modelling to verified RTL and silicon bring?up. You will join a multidisciplinary group creating next?generation OTPUs where digital, optical and mixed?signal domains intersect. The ideal candidate will have a strong background in electrical engineering and semiconductor physics, along with a passion for developing reliable, high-performance digital circuits that drive breakthrough AI hardware.

Responsibilities

Architect, design and implement high?throughput digital pipelines (multi?GSPS input rate, continuous streaming data paths, deep pipelining and hand?shaking) in advanced CMOS nodes. Prototype and iterate rapidly in FPGA (Xilinx/AMD, Intel, or equivalent): bring?up real?time demos, exercise high?speed transceivers, and feed learnings back into the ASIC. Model algorithms and validate concepts in MATLAB/Simulink (or equivalent), ensuring functional equivalence through to gate?level sign?off. Own RTL development (SystemVerilog / Verilog / VHDL) including synthesis, static?timing closure, formal and constrained?random verification. Analyse power, performance and area (PPA); implement innovative techniques to achieve aggressive bandwidth?per?watt targets. Collaborate with optical?hardware, mixed?signal and software teams to optimise data?converter interfaces, clock?domain crossings and firmware abstractions. Mentor junior engineers, lead design reviews and champion best?practice design methodologies.

Skills & Experience

7+ years of hands?on digital design for high?performance ASICs or SoCs, including ownership of at least one product that processes a continuous real?time data stream. Proven success closing timing on multi?hundred?MHz to multi?GHz clock domains and integrating high?speed IP (e.g., SerDes, HBM/DDR, PCIe, 100 GbE or similar). Expertise with industry?standard EDA flows: RTL synthesis, CDC/RDC, STA, power?intent (UPF/CPF), lint, and gate?level simulation. Demonstrated FPGA prototyping skills: constraint management, transceiver tuning, and hardware debug in the lab. Proficiency using MATLAB/Simulink or Python/NumPy for algorithm modelling, fixed?point analysis and test?vector generation. Solid grounding in digital signal?processing concepts, computer?architecture fundamentals and semiconductor device physics. Excellent communication and cross?functional collaboration abilities; thrives in a fast?moving, ambiguous environment.

Nice to have

Tape?out experience at 22 nm or below. Knowledge of coherent optical links or photonic?electronic co?design. Familiarity with AI/ML workloads, systolic arrays or tensor?processing architectures. Contributions to open?source RTL, verification frameworks or FPGA boards.

Compensation & Benefits

Competitive salary and stock options, you're not just part of the journey, you will own a piece of it. Work from our HQ in King's Cross, right in the middle of London's buzzing AI scene. Live within 45 minutes of the office? Perfect. Live within 20 minutes? We'll add an extra

24,000 a year

to your salary. We offer visa sponsorship and full relocation support (UK and abroad), through a dedicated third-party provider who are on hand to make your move to London as seamless as possible. Full BUPA healthcare and dental cover, medical history disregarded. High-spec tech for everyone - M4 Macs as standard, M4 Pros for Engineers. Sony noise-cancelling headphones and ergonomic setups to keep you comfortable and focused. Personal company card to spend on tools that help you do your job - like ChatGPT Pro or anything else that boosts your workflow. Healthy, chef-cooked dinners in the office every night, with something for every diet and tastebud. Monthly off-site team socials. 25 days of paid holiday, plus all the UK bank holidays. Access to our in-house 3D printer for personal or work projects. Cycle2work scheme. Need a caffeine fix? We've got you covered with a tab at our favourite local coffee shop. We offer a pension plan and salary sacrifice options.

We're building fast and that includes our benefits. More exciting additions are coming soon for the Flux crew.

If you are passionate about pushing the boundaries of what's possible in AI and thrive in a high-energy, fast-paced environment, we want to hear from you. Apply now to join Flux and be a key player in shaping the future of computing.

Compensation Range: 0 - 135K