Callosum
Founded by two Cambridge neuroscience PhDs; systems software that breaks an AI workload into tasks and routes each to the model and chip best suited to it, so heterogeneous silicon can stand in for banks of identical GPUs. First equity investment from the UK's Sovereign AI Fund.
UK & remote roles
18 open- Accelerator Systems Software - Member of Technical StaffLondonView →
- Agent Runtime & Systems - Member of Technical StaffLondonView →
- Applied AI - Member of Technical StaffLondonView →
- Cloud Systems & Resource Orchestration - Member of Technical StaffLondonView →
- Compliance Lead - Member of Technical StaffLondonView →
- Evolutionary Optimisation - Member of Technical StaffLondonView →
- Expression of Interest - Intelligent Systems EngineerLondonView →
- Head of Physical InfrastructureLondonView →
- Inference Engine Development - Member of Technical StaffLondonView →
- Inference Performance & Deployment - Member of Technical StaffLondonView →
- ML Research Engineer - Member of Technical StaffLondonView →
- ML Research Scientist - Member of Technical StaffLondonView →
- Networking & Interconnect Systems - Member of Technical StaffLondonView →
- Research Engineer, Benchmarking - Member of Technical StaffLondonView →
- Research Engineer, Evals - Member of Technical StaffLondonView →
- Security Lead - Member of Technical StaffLondonView →
- Site Reliability - Member of Technical StaffLondonView →
- Systems Tooling - Member of Technical StaffLondonView →
Snapshot from 2 Sept 2026. Roles change fast; always confirm on the company's site.