Platform Reliability Engineer for AI Infrastructure

Callosum Technologies Ltd.; Greater London; Hybrid; GBP 90,000 - 130,000; Full time

Benefits offered by this job

Equity

Private healthcare

Visa sponsorship

Relocation assistance

London office

Job summary

Callosum Technologies Ltd. in London is seeking an experienced Platform Reliability Engineer to own the production health of our platform, defining SLOs, observability, incident response and capacity planning across heterogeneous compute backends.

You will collaborate with platform, hardware and orchestration teams to expose backends reliably, build a blameless culture, and drive reliability improvements at scale.

Qualifications

• Strong SRE or production-engineering background running customer-facing systems at scale.
• Fluency with modern operational tooling: observability stacks, container orchestration, infrastructure-as-code, CI/CD.
• Experience owning incident response and driving reliability improvements.
• Compliance execution experience.

Responsibilities

• Define service-level objectives, monitoring, alerting and observability for a production platform.
• Lead on-call and incident response with runbooks, escalation, blameless postmortems, and follow-through.
• Perform capacity planning and operate across heterogeneous compute backends.

Skills

SRE background

Production engineering

Incident response

Reliability improvements

Capacity planning

Open-source contributions

AI-native / Early-stage experience

Tools

Observability stacks

Container orchestration (Kubernetes)

Infrastructure as code (Terraform)

CI/CD pipelines

Compliance tooling

Job description

Callosum Technologies Ltd. in London is seeking an experienced Platform Reliability Engineer to own the production health of our platform, defining SLOs, observability, incident response and capacity planning across heterogeneous compute backends.

You will collaborate with platform, hardware and orchestration teams to expose backends reliably, build a blameless culture, and drive reliability improvements at scale.