💼 Full-Time Position

Senior Backend Engineer - Commercial Technology

🏢
On
📍 London, England, United Kingdom
📍
Location
London, United Kingdom
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Posted
June 09, 2026
⏰
Type
Full-Time
🎯

Full-Time Opportunity: This is a permanent, full-time position with a competitive package and real career growth potential.

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, prod...