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

Requirements:

• 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

• Strong Computer Science fundamentals in algorithm design, data structures, problem-solving, and complexity analysis; these matter even more when you're reviewing and steering AI output

• Knowledge and experience with database design

• Extensive experience with relational databases, including Postgres

• You are not dependent on libraries (or AI tools), but know when, where, and why you should use them

• Familiarity with CI/CD pipelines and comfort with build automation and dependency management tools like Maven

• A collaborative mindset and experience working across teams and functions

• Curiosity, openness to learning, and the confidence to step outside your comfort zone

• Clear and direct communication

Location:

• Berlin

• Hybrid model

Purpose, a great company culture and incredible benefits - what to expect at rebuy:

• Work with a friendly team that is passionate about circularity and wants to make the world a little more sustainable, one transaction at a time.

• Feel comfortable in an environment where independence and new ideas are welcome.

• Benefit from flat hierarchies and the greatest possible transparency so that things don't take longer than they have to and you always feel well informed.

• Enjoy our centrally located office in Berlin (Erkelenzdamm 11 - 13, 10999 Berlin).

• Benefit from our family-friendly, flexible environment and paid child sick leave.

• Bring your dog to the office: we love animals and want to cuddle yours, too!

• Use employee discounts on rebuy.de, sustainable products at Futurebens, offers for sustainable micro-mobility and massages directly in our office.

• Have fun at our legendary team and company events.

• Use our mental health offers as part of a cooperation with Nilo.

• Take care of your work-life balance with 30 vacation days.

• Stay active with our own gym located directly in the building, making it easy to fit workouts into your daily routine.

• Benefit from an on-site daycare in the building, supporting a truly family friendly and flexible working environment.

*At rebuy all people are welcome and supported! We would like to talk, regardless of age, disability, national and social origin, skin color, religion, gender identity and sexual orientation. Just be who you are.

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