Senior Backend Engineer - Commercial Technology

Onrunning

London (HQ London) Remote permanent

Posted: February 20, 2026

Required Skills

Job Description

Your Mission

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.

What you'll do

• 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

At On, we are a team of explorers, dreamers, and innovators. We live and breathe our mission to ignite the human spirit through movement. We offer a dynamic, fast-paced, and collaborative environment where you can make a real impact. You'll be surrounded by passionate and talented colleagues, with plenty of opportunities for professional growth and development.

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