Factorial HR is seeking a senior Kubernetes-focused infrastructure engineer to own the CI/CD platform end-to-end. You will manage self-hosted GitHub Actions runners on bare metal, optimize builds, and ensure fast, reliable test data services for Rails apps across European datacentres. You will design caching, scale the runner fleet, and operate IaC with Terraform and GitOps tools. A strong Linux foundation and scripting are essential for on-call reliability and incident response.