Senior​/Digital Design Engineer

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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.

• 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 (System Verilog / 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.

• 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., Ser Des, 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/Num Py 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.

• 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.

• $194,000 – $270,000, depending on experience, skills, and location.
• Competitive stock options, you’re not just part of the journey, you will own a piece of it.
• Live within 45 minutes of the office? Perfect. Live within 20 minutes? We’ll add an extra location bonus to your salary.
• We offer financial and operational relocation support (US and abroad), through a dedicated third‑party provider who is on hand to make your move as seamless as possible.
• We offer visa sponsorship so if we make you an offer we will make every reasonable effort to secure you a visa, but we may not be able to sponsor visas for every role and candidate.
• We’re in the process of setting up a US group policy once we have 5+ employees. In the meantime, we’re providing a health insurance stipend of $800/month to offset costs. Once the group policy is live, Flux will cover 100% of the employee premium, and offer options like dental, vision and life insurance with an aim to remain competitive among Austin tech and start up employers.
• We offer US employees access to a 401(k) retirement savings plan and we…