Backend Engineer (m/f/d) - Kotlin / Java

We are rebuy, pioneers in the sustainable reuse of electronics and media, and we are looking for you! Our mission: to make circular living accessible to all, one transaction at a time. By giving products a second chance, we reduce resource consumption and avoid unnecessary e-waste.

Our global team of 500 drives things forward collaboratively, takes personal responsibility, values constructive critical thinking, and is dedicated to serving our customers and planet.

We are looking for a passionate and experienced Software Engineer who loves working in a team and has a strong getting-things-done attitude.

You will be part of a small but fun team of 4 people working on some of the most business-critical and technically interesting parts of rebuy's platform. Our scope covers AI-powered customer support automation, payment systems, and marketplace integrations (Amazon, eBay). We build on a modern, actively evolving stack, and we expect everyone on the team to use AI tools as a natural part of their workflow.

Key Responsibilities:

• Write code that is simple, readable, testable, and maintainable, whether you write it yourself or with the help of AI tools

• Conduct code reviews, give helpful feedback, actively contribute in team discussions and decisions

• Know the sweet spot between implementing beautiful and charming solutions which incorporate all existing software design patterns and just getting it done

• Suggest changes to our software that simplify the technical architecture of individual services or pay down technical debt

• Actively take over ownership for projects and collaborate with different teams across the organization

• Maintain existing services and contribute to developing the new solutions

• 2+ years of professional software development experience in Kotlin or Java (mandatory)

• Hands-on experience using AI coding tools (e.g. Claude Code, Cursor, etc.) in your daily work, and a clear sense of where they help and where human judgment matters most