Principal Platform Identity 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, and builds and operates the shared services the estate's own operation depends on. The function works closely with the engineering teams that build the platform, supplying the production evidence that shapes what they fix and what they build next. 

Principal Platform Identity 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 Principal Platform Identity Engineer builds and operates the trust plane the estate's administrative and privileged access depends on: workforce and privileged identity, the internal certificate authority, secrets management, and the just-in-time access model tied to the change record. This is the trust plane of the platform, the foundation that access, privilege and every service's authentication rest on. 

This is a hands-on principal-level role with deep technical expertise. The trust plane is engineered, not administered: identity, certificates and secrets are provisioned as code, integrated into the delivery pipeline, and designed for rotation and recovery from the outset. The role holds key custody for the estate and carries out-of-hours accountability for the trust plane alongside a peer. 

Key Responsibilities 

• Design, build and operate the workforce and service identity platform, including single sign-on and identity provider integration (for example authentik, Okta, Keycloak or Entra ID). 

• Design, build and operate the internal certificate authority and certificate lifecycle management for the estate (for example step-ca or an equivalent internal PKI), and the secrets management platform (for example OpenBao or HashiCorp Vault), including rotation, access policy and audit. 

• Automate identity, certificate and secrets provisioning as code, embedded into CI/CD and infrastructure-as-code workflows, so that access and credentials are never provisioned by hand. 

• Own the privileged access management model: just-in-time elevation tied to a change record, approval workflows, and recorded break-glass access for emergencies. 

• Implement and enforce least-privilege access patterns across the estate to the policy set by the Platform Security Engineers, and report on whether access matches the model in practice, with independent audit of that access carried out by Security. 

• Design the trust plane for resilience, including certificate and secret rotation. 

• Design and operate key custody for the estate's cryptographic material under dual control, so that no single person can access or use production key material alone, with named custodians, recorded quorum operations and an auditable custody record. Own the delegated-authority model that keeps custody and out-of-hours cover available without depending on one individual. 

• Harden the identity, certificate and secrets services to the same standard they enforce on everything else, and produce the access and certificate evidence ISO 27001, SOC 2 and enterprise customer due diligence require, for collation by the Service Delivery Manager. 

• Provide the deepest technical expertise for identity, certificate and secrets faults, approve and review just-in-time access requests that require judgement beyond the standard workflow, and mentor engineers across the function on identity and secret management practice. 

• Own the privileged access management model: just-in-time elevation tied to a change record, approval workflows, and recorded break-glass access for emergencies, designed so that no one approves their own access and privileged access to the trust plane itself is approved outside this role's own team. 

Skills & Experience 

Required Skills