Senior Kubernetes Platform Engineer

AI FactoryOS Operations
AI FactoryOS is Firmus' proprietary operating system for the AI Factory. It governs GPU telemetry, cooling, power and grid interaction as one integrated layer, so that every Firmus site can be optimised and monitored as a single system.
AI FactoryOS Operations runs that platform in production and owns the 24/7 reliability of AI FactoryOS, Firmus AI Cloud and the platforms built on them, together with the service levels the estate is measured against.
The remit is an engineering one. The function builds the guarded automation, remediation and operational tooling that turn manual response into a software-defined capability. It also builds the shared services the estate's own operation depends on, and runs them. Operating the estate every day is what shows how the platform behaves under real load and under failure, and the function works with the engineering teams that build it to turn what it finds into permanent fixes and design improvements.
Senior Kubernetes Platform Engineer
Role Summary
Firmus runs large-scale, state-of-the-art AI infrastructure built on the latest generation of GPU rack-scale systems and operated as one estate to power the next generation of AI innovation. The Senior Kubernetes Platform Engineer runs the Kubernetes estate that every product and every tenant runs on: the platform controller layer, the virtual cluster platform tenants are provisioned onto, the Kubernetes environment baselines used across the estate, the GPU integration layer, and the automated tenant onboarding and release pipeline.
This is a hands-on senior role with deep technical expertise. This role owns the platform lifecycle execution across the fleet: keeping clusters healthy and current across the fleet, keeping tenant workloads running through upgrade and failure, and restoring control planes to service when they degrade. Automation is a first-class part of the role, in the operational tooling, guarded remediation and fleet orchestration that make estate-scale operation possible, delivered as controlled code and reviewed by AI Infrastructure where it affects service behaviour.
Key Responsibilities
Responsible for the reliable operation, automation and continuous improvement of the multi-tenant Kubernetes platform that Firmus' products and tenants run on, spanning every site in the estate.
Build the operational tooling, guarded remediation and orchestration that automate operations at fleet scale, and contribute operator and controller requirements, and code where agreed, to AI Infrastructure's platform backlog with the production evidence behind them.
Execute the Kubernetes cluster lifecycle across the fleet, including provisioning, patching, upgrade and decommissioning, running the deployment and upgrade mechanisms built by AI Infrastructure through the agreed staged or canary path, and holding estate version compliance and retirement coordination.
Operate and recover Kubernetes control planes carrying live tenant workload, including etcd state, certificate rotation, failed upgrades and corrupted resources.