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're searching for a Digital Design Engineer who is passionate about

building and verifying complex, high?performance ASICs

. You will own the definition and execution of verification strategies for the digital subsystems that control, configure and monitor Flux's optical datapaths and AI compute fabrics. Your work will ensure first?silicon success and robust, production?worthy silicon that scales to data?centre volumes.

Responsibilities

Architect, implement and maintain comprehensive verification environments (SystemVerilog + UVM, assertion?based and formal) for datapath, control, memory and high?speed I/O blocks in our OTPU. Define verification plans that target functional correctness, low?power modes, safety, reliability and security requirements; derive and track coverage metrics to closure. Develop reusable VIP and stimulus generators for modules such as network?on?chip routers, DDR/LPDDR controllers, PCIe/CXL interfaces and proprietary photonic control logic. Collaborate closely with RTL designers to iterate on micro?architectures, resolve corner?case bugs and balance PPA (power, performance, area) trade?offs uncovered during verification. Drive RTL quality GDS sign?off: run lint, CDC/RDC, SDC constraint validation, gate?level simulations, GLS with SDF, and power?aware checks; work with physical?design teams on ECOs. Enable post?silicon bring?up by generating test vectors, configuring scan/DFT hooks, and supporting FPGA/emulation platforms for firmware and software teams. Mentor junior engineers on verification methodology, code reviews, and best practices; champion continuous?integration flows, regressions and results dashboards. Track industry advances in formal verification, emulation, coverage?driven flows, RISC?V vectors, and AI?centric design techniques to keep Flux at the forefront of silicon quality.

Skills & Experience

3+ years in digital ASIC/SoC design & verification, with at least two tape?outs. Mastery of SystemVerilog/UVM, functional coverage, constraint?random stimulus and scoreboards. Deep understanding of clock?domain crossing, reset and power?domain management, DFT/scan and low?power (UPF/CPF) methodologies. Strong scripting (Python, Tcl, shell) to automate regressions and data analysis. Proven debug skills across RTL, gate?level and emulation environments.

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.