8 months ago
London, United KingdomSenior
Responsibilities
- Build infrastructure that orchestrates heterogeneous compute across models, workflows, and silicon.
- Develop high-performance systems, low-level performance engineering, inference infrastructure, orchestration, or distributed systems.
- Bring up hardware and develop kernels or accelerator programs for novel accelerators.
- Create simulations, models, and workloads for heterogeneous compute systems.
Requirements
- Exceptional engineering skills and a desire to work on difficult AI infrastructure problems.
- Experience in high-performance systems, low-level performance engineering, inference infrastructure, orchestration, distributed systems, hardware bring-up, kernel development, accelerator programming, simulation, modelling, or workload design.
Benefits
- The team is based in London and works across the full depth of the technology stack.
- This is a general interest application reviewed on an ongoing basis rather than a specific role.
About Callosum
Callosum builds AI infrastructure that unifies heterogeneous compute—software and systems to orchestrate diverse accelerators and the physical clusters they run on—for organizations training and serving models. The privately held company was founded in 2025 and is headquartered in London. It focuses on designing, deploying, and operating mixed-hardware compute fleets across sites and vendors, and raised a seed round in 2026.