Senior Backend Engineer - Commercial Technology

London, United KingdomOn-site

Responsibilities

Design, develop, and maintain robust and scalable backend services using our modern tech stack, with a primary focus on NestJS, TypeScript, and GraphQL.
Collaborate closely with frontend engineers, product managers, and other stakeholders to deliver end-to-end features.
Deploy and operate your services in a cloud-native environment on Google Cloud Platform (GCP), using Kubernetes and Docker.

Agentic engineering, comfortable using AI in your daily workflow
A strong background in backend development, with proven
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).
Event-driven systems (e.g., Kafka, BullMQ, Pub/Sub)

Our Direct to Consumer business is performing and growing strongly, which is why we - within the Commercial Platform team at On - are looking for a Senior Backend Engineer to scale On’s online business to the next level.
You will be sitting in our office in London and collaborating closely with the cross-functional Digital teams across our key locations.
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. What You'll Do
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).
Engage with and contribute to our distributed systems landscape, helping to build resilient systems that can handle our growing scale. Your Story
experience building and shipping high-quality software.
You are a collaborative team player with excellent communication skills, comfortable working in an agile environment.
As you might expect from a running brand, the wider E-Commerce team at On is a fast-paced place to be.