Modelling Engineer (Mid-Level or Senior)

Modelling Engineer (Mid-Level or Senior) Fractile · London or Bristol · Full-time · Hybrid About Fractile Fractile is building a new class of AI accelerator — designed to run the world's largest language models dramatically faster than existing systems. Founded in 2022 and scaling fast, we work at the intersection of cutting-edge hardware and software, in modern offices in London and Bristol. If you want your work to directly shape the future of AI infrastructure, you'll fit right in. The Role To build hardware that doesn't yet exist, you first have to model it — with precision, depth, and an eye for the trade-offs that matter. At Fractile, high-fidelity pre-silicon models shape our architecture, performance, and product design long before hardware exists. This is where you come in. You'll be joining a high-calibre simulation and modelling team that includes engineers with deep expertise in C++, verification, and architectural modelling. This isn't a support function — it's the group that defines how Fractile's hardware behaves. What You'll Work On You will develop the pre-silicon models of Fractile's AI acceleration hardware, enabling: Architectural exploration and definition Functional modelling Performance modelling and bottleneck analysis Early software development on virtual platforms You'll work closely with hardware, software, and ML teams in a true hardware–software co-design loop. No silos — just tight collaboration across disciplines.