Senior AI Systems Administrator (Contract) | Cambridge | £500 to £600 per day | Outside IR35 A not-for-profit AI organisation in central Cambridge needs an experienced contractor to build and run its GPU infrastructure. You’ll provision and look after multi-rack GPU clusters used for training and inference, from the hardware and fabric up to orchestration. Researchers and engineers rely on this platform every day. What you’ll deliver Multi-rack GPU servers deployed, tuned and stable under training and inference workloads High-performance networking built and maintained (InfiniBand, RDMA, RoCE), plus the switches, routers and firewalls around it The estate managed as code with Git and Terraform/OpenTofu, so it’s repeatable and handed over cleanly Linux hosts, hypervisors and VMs administered across Ubuntu and RHEL Ongoing tuning with the people who use the systems, based on how they actually run themYou’ll need A strong track record as a Systems Administrator, HPC Engineer or MLOps Engineer, ideally on contract Hands-on GPU server deployment and tuning at multi-rack scale Strong InfiniBand/RDMA/RoCE skills and solid network design Advanced Linux, virtualisation and infrastructure-as-code skills The ability to get productive quickly in a small, collaborative teamUseful extras: Lustre, Ceph, Weka or PEAK:AIO storage; Slurm or LSF; Python scripting. The details Rate: £500 to £600 per day, Outside IR35 Duration: 3 months, with scope to extend Start: ASAP Location: 3 days a week on site, in an office a few minutes’ walk from Cambridge station Hours: UK business hours only, with no on-call rota. Major maintenance is occasionally scheduled for a weekend, agreed in advance