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# (Senior) Full Stack Engineer (Backend Focus)

- **Company:** Chrono24 GmbH
- **Location:** Karlsruhe, Germany
- **Experience:** Expert
- **Contract:** Permanent contract
- **Skills:** Java (Programming Language), Application Programming Interfaces (APIs), Artificial Intelligence, Apple IOS, MySQL, Swiftui, Claude Code, Backend, Vue.js, Build Management, Gitlab-ci, Jetpack Compose, Front End Software Development
- **Published:** October 7, 2026
- **Apply:** https://www.careerjet.de/jobad/dee5d8f24de7a8224607a1416b3673e290

## About the Role

* Think in terms of the problem, not the ticket, and care whether a feature actually makes a difference for buyers.
 * Write code that others can read, change, and trust.
 * Are most at home in the backend, but don't stop at the API when a feature needs frontend changes.
 * Use AI tools like Claude Code every day and review their output as critically as you would a colleague's code. Experience in setting up and improving an agentic coding environment is a plus.
 * Enjoy a good debate: you challenge ideas, including ours, and commit once a decision is made.
 * Value pragmatism over purity and can tell "good enough for now" from "this will hurt us later."

## Description

Chrono24 is the world's leading marketplace for luxury watches. In Buyer Experience, our Loyalty team makes sure buyers don't just purchase once but keep coming back. We're a cross-functional team of product management, UX, QA and engineering that owns its product area end to end.
What you'll do

 * Build the features that keep buyers coming back, such as Watch Collection, Wishlist, and the user account.
 * Work closely with product management and UX: challenge product ideas, propose simpler solutions, and bring your technical expertise together with their product expertise.
 * Design and build backend services and APIs with Java and Spring, implement the frontend changes a feature needs, and keep it all reliable in production.

What you can expect

 * A platform used by millions of watch enthusiasts worldwide, with the reach of an established marketplace and the short decision paths of a small team.
 * Open discussions about quality and trade-offs, where good arguments count for more than hierarchy.
 * Java 25, Spring, MySQL; Vue.js, Jetpack Compose, and SwiftUI across web, Android, and iOS; GitLab CI; AI tools like Claude Code in our daily workflow.
 * 10% of your working time reserved for learning or personal projects.