Devops Engineer

Devops Engineer Job title: Devops Engineer Location: London; full in-office working as default Start date: ASAP Reports to: CTO Compensation: Salary : £60 - 90k Equity : £60 - 90k ___________________________________________________________________________ COSINE AT A GLANCE At Cosine, we’re building autonomous AI engineers that plan, write, and ship code inside real development workflows. Cosine is designed for on-premise and virtual private cloud (VPC) deployments, including fully air-gapped environments. We build our agent tooling entirely in-house and post-train open-source models to deliver reliable, enterprise-grade coding performance in security-critical settings. In 2024, Cosine achieved a 72% score on OpenAI’s SWE-Lancer benchmark, placing us among the strongest real-world software-engineering AI systems evaluated. YC-backed and well-funded, Cosine was founded by experienced operators focused on building dependable, production-grade AI. This role is based in our Hoxton office, five days a week, because close collaboration, fast feedback, and shared context matter for the problems we’re solving. ___________________________________________________________________________ THE ROLE We’re looking for a Devops / Senior Platform / Infra Engineer to own the core infrastructure that powers Cosine’s products — from Kubernetes and deployment pipelines to networking and platform services. You’ll design and run the “paved road” that our engineers, researchers, and customers build on: reliable Kubernetes clusters, fast and safe CI/CD, solid observability, and hardened environments for demanding enterprise and on-prem deployments. You’ll also wear a classic “DevOps/SRE” hat: thinking in SLOs, running incident response, and keeping us up even as we move quickly. This is a high-ownership role at a fast-paced, venture-backed Silicon Valley startup. You’ll work directly with founding engineers and leadership, and your decisions will materially shape how we build and ship products. ___________________________________________________________________________ WHAT YOU’LL DO - Own core infrastructure - Design, operate, and evolve our 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 needed to run our APIs and agents. - Build the deployment & tooling layer - Design and maintain CI/CD pipelines for image builds and infra rollouts (e.g. Pulumi/Terraform + Helm/Docker). - Implement safe rollout strategies (blue/green, canary, staged rollouts) and fast rollback paths. - Build internal tools and abstractions that make it easy for product teams to self-serve infra safely. - Own reliability & operations (SRE-ish) - Define and track SLOs/SLIs for key services (latency, error rates, availability). - Improve our observability stack (metrics, logs, traces, alerts) so issues are obvious, actionable, and debuggable. - Participate in the on-call rotation, lead incident response when needed, and drive blameless post-mortems and fixes. - Shape networking & security - Design and maintain networking: VPCs, subnets, ingress/egress, service meshes / L7 routing, DNS, and TLS. - Implement least-privilege access via IAM, secure secret management, and hardened configurations for multi-tenant and isolated customer environments. - Help design patterns for secure enterprise and on-prem / regulated deployments. - Partner with product & research - Work closely with application, ML, and research teams to understand their needs and translate them into reusable infra building blocks. - Provide guidance on “how to run this in production” — capacity planning, failure modes, and operational readiness reviews. ___________________________________________________________________________ WHAT WE’RE LOOKING FOR - Have strong experience - 5+ years building an ... (truncated, view full listing at source)