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

Meyandy LLC; Berlin; Hybrid; EUR 70,000 - 110,000; Full time

Benefits offered by this job

Dog-friendly office

Paid child sick leave

Employee discounts

In-office massages

Central Berlin office

Job summary

rebuy in Berlin is seeking a Backend Engineer (m/f/d) with Kotlin and Java experience to join a small, high-impact team. You will write clean, testable code, review peers, and help shape scalable services across AI-powered support, payments, and marketplace integrations in a hybrid office environment.

Required: 2+ years of Kotlin or Java, strong CS fundamentals, and familiarity with PostgreSQL and Maven. We value curiosity, collaboration, and the ability to balance AI-assisted work with human

Qualifications

• 2+ years of professional software development in Kotlin or Java.
• Hands-on experience with AI coding tools in daily work.
• Strong CS fundamentals in algorithms, data structures, and complexity.

Responsibilities

• Write clean, readable, and maintainable code.
• Conduct code reviews and contribute to team discussions.
• Own projects and collaborate across teams to simplify architecture and reduce technical debt.

Skills

Kotlin

Java

AI coding tools

Algorithms

Tools

Maven

PostgreSQL

CI/CD

Job description

# Backend Engineer (m/f/d) - Kotlin / JavarebuyVia arbeitnowBerlin, DEPubliée il y a 14h## Description du poste**Ready to become part of the most important mission on this planet?**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.### The RoleWe 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 ### **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 an...