On - Senior Backend Engineer – Commercial Technology - London

Team for Career Site

Technology

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

Meet the team

At On, we believe everyone in the world should have access to the best sportswear. For this to happen, we need high performing solutions to ensure that the right product gets to the right customer at the right time, while making the overall process efficient, environmentally friendly and sustainable.lon