Summary
✨ AI‑Generated
A senior backend engineering opportunity focused on transaction and payment-related systems. You will build and operate production services using Java and Spring Boot, work with Kafka and event-driven distributed architectures, integrate external service providers, and take ownership of complex technical and business challenges from implementation through production. This is a fixed-term maternity-leave replacement through January 2027.
Highlights
Own production backend services end-to-end while working with a modern Java stack, event-driven architecture, external payment and shipping integrations, and technically challenging transaction workflows. The role offers direct impact on a high-volume user experience and hands-on ownership from implementation through production.
Description
Job Description
Join the Kleinanzeigen Transactions area (TRX) as a Backend Engineer and help shape the transaction experience on Kleinanzeigen.
TRX is responsible for the money-related parts of our platform, including experiences such as “Direkt kaufen”, as well as the shipping processes connected to transactions.
We integrate and work closely with external partners including our Payment Service Provider and shipping partners.
You’ll work hands-on with a modern Java stack, take ownership of services from implementation through production, and solve complex business and technical challenges that directly impact our users.
This is a temporary maternity leave replacement until January 2027.
Job requirements
Who You Are
You have solid professional experience in backend software engineering with Java and Spring Boot and are comfortable owning production services.You have hands-on experience with event-driven architectures and Kafka and understand patterns for building reliable distributed systems.You are confident working with PostgreSQL, database migrations, automated testing, and modern engineering practices.You approach complex problems systematically, using observability, logs, metrics, and testing to understand issues and develop sustainable solutions.You actively explore and use AI-supported engineering tools and practices to improve development, problem-solving, and software quality.
Job responsibilities
What You’ll Do
Build, evolve, and maintain backend microservices using Java 25 and Spring Boot.Take end-to-end ownership of your services in production, including triaging alerts and investigating issues using structured logs and metrics.Design and implement event-driven systems with Kafka, including reliable messaging patterns such as the outbox pattern.Model complex business workflows around transactions, payments, shipping, and integrations with external partners.Work with PostgreSQL and Flyway to design, evolve, and maintain reliable data models and database migrations.Ensure high software quality through comprehensive unit and integration testing, including Testcontainers, while using AI tools thoughtfully to improve your engineering workflow.
Job benefits
💚 Your benefits at Kleinanzeigen
At Kleinanzeigen, we care about our people — their wellbeing, growth, and life beyond work.
Our benefits are designed to support you holistically, giving you flexibility and opportunities to thrive.
✨ Flexibility
Flexible working time (hybrid)20 days “work from anywhere”Paid additional parental leave for both parentsExtra paid days off for special occasions (e.g.
your wedding or a move)
❤️🩹 Wellbeing & Support
Confidential support & coaching for you and your loved onesAnnual company sports eventsPension and life insurance
📚 Growth & Development
Personal development budgetLearning opportunities to grow your skills and career
🛍️ Perks & Everyday benefits
Corporate benefits and exclusive discountsAn attractive referral program Transportation allowanceFree shipping on Kleinanzeigen Direktkauf
Kleinanzeigen is an equal opportunity employer that values diversity and inclusion.
We welcome people of all backgrounds, races, religions, colours, national origins, gender identities, sexual orientation, ages, marital status, or disability.
If this role sparks your interest but you’re not sure you meet every single requirement, we’d still love to hear from you anyway.
