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Senior Platform Engineer

Cosine· Engineering
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London, England, GB£75k - £100kfull-timePosted 11mo ago

About the role

Own and operate core infrastructure including Kubernetes, deployment pipelines, networking, and platform services, with a focus on reliability, security, and collaboration with product and research teams.

Responsibilities

  • Design, operate, and evolve Kubernetes-based platform (EKS or similar), including cluster topology, node groups, autoscaling, and multi-environment isolation.
  • Manage supporting cloud resources: container registries, load balancers, queues, caches, and data infra.
  • Design and maintain CI/CD pipelines for image builds and infra rollouts using Pulumi/Terraform + Helm/Docker.
  • Implement safe rollout strategies (blue/green, canary, staged rollouts) and fast rollback paths.
  • Build internal tools and abstractions to enable product teams to self-serve infra safely.
  • Define and track SLOs/SLIs for key services.
  • Improve observability stack (metrics, logs, traces, alerts).
  • Participate in on-call rotation, lead incident response, drive blameless post-mortems.
  • Design and maintain networking: VPCs, subnets, ingress/egress, service meshes, DNS, TLS.
  • Implement least-privilege access via IAM, secure secret management, and hardened configurations.
  • Assist with secure enterprise and on-prem deployments.
  • Work closely with application and research teams to develop infrastructure solutions.
  • Provide operational guidance including capacity planning and failure modes.

Qualifications

  • 5+ years building and operating production infrastructure on a major cloud (AWS, GCP, or Azure).
  • Significant hands-on experience running Kubernetes in production (EKS/GKE/AKS or self-managed).
  • Experience with cluster upgrades, autoscaling, node design, multi-env setups.
  • Proficiency with IaC tools such as Pulumi, Terraform, CDK.
  • Experience with setting up and tuning observability tools (Prometheus, Grafana, CloudWatch, OpenTelemetry).
  • Strong scripting and programming skills in languages like TypeScript, Go, Python.
  • Ability to debug production issues, build tooling, and abstractions.
  • Startup mentality: fast environment, pragmatic solutions, clear communication.

Skills

Required:KubernetesAWSIaC (Pulumi, Terraform, CDK)CI/CD pipelinesObservability Tools (Prometheus, Grafana, CloudWatch, OpenTelemetry)Scripting Languages (Python, Go, TypeScript)Troubleshooting and DebuggingCollaboration & Communication
Last updated Mar 18, 2026. Interested? Apply on the company site.
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About Cosine

Fully Agentic SWE

Cosine is a fully agentic SWE that allows you to instantly work on every single ticket at once, asynchronously.

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