Heterogeneous AI Infrastructure Engineer at Callosum, London

Looking for AI infrastructure jobs in the UK with visa sponsorship? Callosum is hiring a Heterogeneous AI Infrastructure Engineer in London.

Photo: High-performance computing infrastructure via Wikimedia Commons.

AI Infrastructure Jobs in the UK: Overview

About the Employer

Callosum builds the infrastructure for heterogeneous AI systems, routing workloads across different models and chips. The London company, founded by Cambridge PhDs, raised $100 million in seed funding in 2026.

Job Responsibilities

• Build and optimise inference serving infrastructure across heterogeneous silicon
• Design and operate systems of different accelerator types, memory capacities and interconnects
• Own distributed systems concerns including coordination, fault tolerance and recovery
• Ensure inference runtimes perform at their limits across varied hardware
• Collaborate with accelerator, runtime and simulation engineering teams

Requirements

• Master’s degree or equivalent in distributed systems or related field
• Strong experience building or operating production distributed systems
• Hands-on experience with Kubernetes or equivalent orchestration
• Experience with inference runtimes such as vLLM, SGLang or TensorRT
• Knowledge of topology-aware scheduling or NUMA-aware placement preferred

Visa Sponsorship and International Applicants

Callosum offers visa sponsorship and relocation benefits. The role is on-site in London.

Salary and Benefits

• Salary range £101,000–£192,000 determined by skills and experience
• Equity
• Medical and dental healthcare
• Relocation support

How to Apply

Apply via Ashby with your CV highlighting distributed systems and inference experience.

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