Senior JavaScript Engineer (Full-stack, Retention)
Relay Commerce, Lisbon +1
The role
This is a primarily back-end role (~70%) where you will design and evolve TypeScript services that power personalized replenishment, cross-sell, and subscription offers used by Shopify stores processing millions of transactions.
You will own features end-to-end, shaping the problem with a Senior Product Manager, proposing the architecture, implementing the solution with the support of AI, and monitoring and operating it in production. These systems need to be reliable, observable, maintainable, and performant.
You will effectively use AI agents such as Claude code and Codex to deliver at pace.
You will also contribute to our React-based front-ends (~30%) when delivering features as part of an experienced multi-functional team.
What you will do
- Work as part of a skilled, AI-native, multi-disciplined product engineering team to rapidly deliver modern software, to excellent quality standards, across high-volume subscription and billing systems.