Job Description
Company Overview
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 are seeking a Physical Layout Engineer to own the full‑custom layout of ultra‑high‑speed analog blocks that lie at the heart of the OTPU including: high speed DAC/ADC/TIAS, sub‑100 fs‑rms jitter PLLs and large multi-lane clock‑distribution meshes.
You will translate transistor‑level intent into silicon‑accurate geometry, balancing dense floorplans with the exacting parasitic, symmetry and matching constraints that high‑frequency analog demands.
Responsibilities
1. Plan, execute and sign‑off full‑custom layouts for high‑speed analog/RF IP (TIAs, PLLs, CDRs, drivers, samplers, bias networks, ESD clamps).
2. Drive floorplanning and top‑level integration, coordinating power‑grid, clock‑mesh and micro‑bump/flip‑chip escape routing so 100 + channels meet skew and return‑loss targets.
3. Perform parasitic extraction and EM/IR, thermal and electro‑mi...