THE OPPORTUNITY
Lumai is redefining how the world computes. We are an ambitious, venture-backed UK startup building an AI accelerator for the data centre that performs computation in 3D free-space optics, using light rather than electricity to run the matrix multiplications at the heart of AI inference.
Our technology unlocks performance and efficiency gains that could reshape the economics of AI infrastructure: orders of magnitude more throughput at a fraction of the energy of conventional approaches.
If you want to work on technology that did not exist five years ago, and to see the direct impact of what you build, Lumai is where you can make it happen.
ABOUT LUMAI
Founded in 2022 as a University of Oxford spinout, Lumai uses optical processing to accelerate large language models and other transformer-based AI systems. Our team brings together optical computing, machine learning and physics expertise alongside silicon, systems and compiler engineers.
We have raised over $15 million from leading deep-tech investors, including Constructor Capital, IP Group and PhotonVentures,



plus government grants, and are scaling rapidly to deploy the fastest optical compute available globally. We offer a collaborative, low-ego culture, meaningful equity, and the rare opportunity to shape both the hardware and the software defining the next era of AI compute.
About the role
Behind every high-speed analog front end sits a layer of infrastructure that has to just work: clean references, stable biasing, and clocks that arrive where and when they're needed. As a Mixed-Signal IC Designer at Lumai, you will design the circuits that make that infrastructure possible: bias and reference generation, PLLs, and the interface circuits that connect our analog and digital domains.
You will work on a variety of mixed-signal building blocks that support Lumai's photonic receiver chain and broader ASIC platform, with plenty of scope to grow technical depth in clocking and reference design as the t

📌 Mixed-Signal IC Designer (España)
🏢 Lumai
📍 España