Senior Backend Engineer - Commercial Technology

London

In short
As a Backend Engineer in our Commercial cluster, you will be at the heart of On's digital ecosystem. You will design, build, and scale the critical services that power our global e-commerce platform, B2B partner portals, and retail experiences. Your work will directly impact how we deliver product information, checkout process and end-to-end e-com user experience, to our customers and partners, ensuring a seamless and premium experience that drives our commercial success.
Your mission
Design, develop, and maintain robust and scalable backend services using our modern tech stack, with a primary focus on NestJS, TypeScript, and GraphQL. Take ownership of key components within our Commercial cluster, ensuring they are performant, reliable, and meet the needs of various client applications (web, mobile, and third-party integrations). Collaborate closely with frontend engineers, product managers, and other stakeholders to deliver end-to-end features. Write/Vibecode clean, maintainable, and well-tested code, and contribute to a culture of high quality and continuous improvement through code reviews and pair programming. Deploy and operate your services in a cloud-native environment on Google Cloud Platform (GCP), using Kubernetes and Docker. Engage with and contribute to our distributed systems landscape, helping to build resilient systems that can handle our growing scale.
Your story
A strong background in backend development, with proven experience building and shipping high-quality software. Proficiency in Node.js and TypeScript, with a deep understanding of modern backend frameworks. Hands-on experience with NestJS is a significant advantage. Solid experience in designing, building, and consuming GraphQL APIs. Strong knowledge of relational databases (e.g., PostgreSQL) and data modeling. Hands-on experience with cloud platforms (GCP is a plus) and containerization technologies (Docker, Kubernetes). You are a collaborative team player with excellent communication skills, comfortable working in an agile environment. Bonus points for experience with: ORM tools like MikroORM Event-driven systems (e.g., Kafka, BullMQ, Pub/Sub) E-com ecosystems
What We Offer
On is a place that is centered around growth and progress. We offer an environment designed to give people the tools to develop holistically – to stay active, to learn, explore and innovate. Our distinctive approach combines a supportive, team-oriented atmosphere, with access to personal self-care for both physical and mental well-being, so each person is led by purpose.
On is an Equal Opportunity Employer. We are committed to creating a work environment that is fair and inclusive, where all decisions related to recruitment, advancement, and retention are free of discrimination.

Posted 2026-03-15

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