Senior/Staff Analog Design Engineer - TIA

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’re searching for a Senior/Staff/Analog Design Engineer with a strong focus on CMOS analogue design to lead the design, validation and productisation of ultra‑high‑speed (> 10 GHz) transimpedance amplifiers that sit at the electrical-optical front end of our OTPU. The role demands deep expertise in low‑noise, wide‑bandwidth analog circuit design, simulation and measurement. The ideal candidate will pair a solid grounding in semiconductor physics with a passion for building reliable, production‑worthy TIAs that unlock new levels of AI‑hardware performance.

Responsibilities

• Design and develop high‑speed CMOS TIAs – from schematic through post‑layout verification, lab bring‑up and production test – meeting stringent bandwidth, input‑referred‑noise and linearity targets for our optical links.

• Work hand‑in‑hand with opto‑electronic and packaging teams to co‑design the photodiode, package, and PCB interconnect that surround the TIA, ensuring seamless system integration.

• Analyse circuit performance, identify bottlenecks (e.g. excess input capacitance, stability, power), and implement innovative solutions such as inductive peaking, active feedback, or process‑corner tuning to optimise speed, noise and power.

• Mentor junior engineers, run in‑depth design and layout reviews, and champion best‑practice methodologies for high‑frequency, low‑noise analog design.

• Track and bring into the team the latest advances in TIA architectures, CMOS processes, RF‑EDA flows and test techniques to keep Flux at the cutting edge.

Skills & Experience

• 7 + years of industry experience in CMOS integrated‑circuit design with a primary focus on high‑speed, low‑noise analog front ends (TIA, LNA, or similar).

• Mastery of analog/RF EDA flows: schematic capture, SPICE and S‑parameter simulation, layout and parasitic extraction, and post‑silicon characterisation.

• Proven track record of meeting sub‑pA/√Hz input‑referred noise, multi‑10‑GHz bandwidth and tight power budgets in a shipping product.

• Bachelor’s degree in Electrical Engineering (or related); Master’s / PhD a plus.

• Strong problem‑solving skills, especially in feedback stability, transmission‑line effects, package modelling and de‑embedding.

• Excellent collaboration and communication abilities for effective cross‑disciplinary teamwork.

• Demonstrated success in fast‑paced environments where innovation and rapid iteration are paramount.

• A portfolio of personal or open‑source projects – or published papers/patents – that highlights creative analog or RF design thinking.

Compensation & Benefits

• $194,000 – $270,000 + annual salary, depending on experience, skills, and location.

• Competitive stock options, you’re not just part of the journey, you will own a piece of it.

• Work from our office in The Domain, right in buzzing Austin with parking available for easy access.

• Live within 45 minutes of the office? Perfect. Live within 20 minutes? We’ll add an extra location bonus ($24K) 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 to Austin 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 plan to introduce an employer match in line with Austin tech market norms (commonly in the 4-5% range). Our goal is to keep our retirement benefits competitive while we scale.

• Top of the line, high-spec tech for everyone.

• 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.

• Periodic travel to London HQ and regular team socials.

• 33 days of paid time off (PTO), including US federal holidays.

Due to U.S. export control regulations, candidates’ eligibility to work at Flux depends on their most recent citizenship or permanent residency status. We are generally unable to consider applicants whose most recent citizenship or permanent residence is in certain restricted countries (currently including Iran, North Korea, Syria, Cuba, Russia, Belarus, China, Hong Kong, Macau, and Venezuela). Applicants who have subsequently obtained citizenship or permanent residency in another country not subject to these restrictions may still be eligible.

Please note: we receive many applications, and this role is not at the top of our priority list. We anticipate reviewing all submissions within 3 weeks, and will contact you if you are shortlisted.

We do not accept unsolicited CVs from recruitment agencies, will not be liable for any fees, and prohibit unauthorised use of our company name in recruitment activities.

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.