Senior Infrastructure Engineer at Cosine.sh

Jack and Jill AI; Greater London; On-site; GBP 70,000 - 90,000; Full time

Job summary

A fast-paced startup in London seeks a Senior Infrastructure Engineer to lead the design and operation of its Kubernetes-based platform. In this role, you will impact how products are built and shipped, ensuring security and reliability. Ideal candidates have 5+ years in cloud infrastructure, hands-on Kubernetes experience, and familiarity with Infrastructure-as-Code tools. Join a dynamic team and contribute to a rapidly evolving infrastructure while working closely with founding engineers.

Qualifications

• 5+ years building and operating production infrastructure on a major cloud.
• Significant experience running Kubernetes in production environments.
• Experience with Infrastructure-as-Code tools.

Responsibilities

• Own the design, operation, and evolution of the Kubernetes platform.
• Build and maintain robust CI/CD pipelines.
• Define and track SLOs for system reliability.

Skills

Kubernetes

CI/CD pipelines

Infrastructure-as-Code tools

Tools

Terraform

Pulumi

AWS

GCP

Azure

Job description

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Senior Infrastructure Engineer

Company Description: Cosine.sh - Fast-paced, venture-backed Silicon Valley startup

Job Description

Job Description:
Join Cosine.sh as a Senior Infrastructure Engineer to own and evolve our core Kubernetes-based platform, deployment pipelines, and observability. You'll design the "paved road" for engineers, researchers, and customers, ensuring reliability and security for demanding enterprise deployments. This high-ownership role directly shapes how we build and ship products.

Location: London, UK

Why this role is remarkable

• Take high ownership, shaping how Cosine.sh builds and ships products alongside founding engineers and leadership.
• Work at a fast-paced, venture-backed Silicon Valley startup, contributing to a rapidly evolving platform.
• Design and run the "paved road" for engineers, researchers, and customers, impacting core infrastructure from Kubernetes to deployment.

What you will do

• Own the design, operation, and evolution of our Kubernetes-based platform, including cluster topology and autoscaling.
• Build and maintain robust CI/CD pipelines, implementing safe rollout strategies and fast rollback paths.
• Define and track SLOs, improve observability, and lead incident response to ensure system reliability.

The ideal candidate

• 5+ years building and operating production infrastructure on a major cloud (AWS, GCP, or Azure).
• Significant hands-on experience running Kubernetes in production, including cluster upgrades and multi-environment setups.
• Deep experience with Infrastructure-as-Code tools like Pulumi, Terraform, or CDK.

How to Apply

How to Apply:
Step 1. Visit our website
Step 2. Click 'Speak with Jack'
Step 3. Login with your LinkedIn profile
Step 4. Talk to Jack for 20 minutes so he can understand your experience and ambitions
Step 5. If the hiring manager would like to meet you, Jack will make the introduction