Senior / Staff Digital Design Engineer

Flux Computing designs and manufactures optical processors to train and run inference on large AI models. Join us 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.

Frequent travel is expected between our Austin and London offices.

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.