Lead - Software Engineer (DevEx)

London, United KingdomOn-site

Responsibilities

Technical Excellence & Advocacy: Write high-quality documentation, help with code reviews and advocate for DevEx best practices across the organization.

Help Engineer the Golden Path: Design and implement highly automated CI/CD pipelines (GitHub Actions) and common templating (Typescript/Node) systems that allow a developer to go from "idea" to "production-ready service" in minutes.
GraphQL Infrastructure: Act as a core contributor to our central Apollo GraphQL API Gateway.
Infrastructure as Code: You are comfortable with Terraform and Kubernetes (GCP
Automation Mindset: You are passionate about CI/CD (GitHub Actions) and building developer tooling (CLIs, SDKs, or Portals).
AI-Augmented Engineering Workflows: You leverage (or at least have an active interest in) the latest agentic coding tools to 10x your productivity, blending deep technical principles with AI-assisted workflows.
As a power user of AI, you orchestrate complex builds and bypass boilerplate to deliver robust, scalable code at pace, ensuring our TypeScript/Node.js environment remains lean and efficient (experience in other tech stacks will be considered).
Architectural API Design:
Experience in crafting robust API contracts with a focus on GraphQL Federation; familiarity with the Apollo tech stack is highly regarded.

At On, we believe technology should move as fast as a runner.
We are building the foundation that allows our engineering organization to scale, innovate, and deliver value without friction.
In this hands-on role, you will build the platform that empowers dozens of technology teams to build, ship, and operate services effortlessly.
You will be involved in architecting and building our "Golden Path," ensuring that speed, safety, and reliability are baked into every developer's workflow. Your Mission
You will help manage the supergraph composition, runtime stability, and schema governance standards to ensure a consistent contract for all consumers.
Help to Build the Internal Developer Platform (IDP): Help develop our Cloud Abstraction Layer and Developer Portal.
This includes building self-service tools, CLIs, and service catalogs that reduce cognitive load for engineers.
SRE & Observability: Integrate "secure-by-default" practices and robust observability into the platform.
You’ll build dashboards (NewRelic) and monitoring patterns that provide teams with deep insights into their service health.
Friction Reduction: Actively hunt for bottlenecks in the software development lifecycle. Whether it's a slow build or a complex deployment process, you'll be involved in fixing it.