Senior Backend Engineer (d/f/m) - Fixed Term contract

Join the KleinanzeigenTransactions 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 Providerand 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 withevent-driven architectures and Kafkaand understand patterns for building reliable distributed systems.
• You are confident working withPostgreSQL, 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 implementevent‑driven systems with Kafka, including reliable messaging patterns such as theoutbox pattern.
• Model complex business workflows around transactions, payments, shipping, and integrations with external partners.
• Work withPostgreSQL and Flywayto 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.

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.

• Flexible working time (hybrid)
• 20 days “work from anywhere”
• Paid additional parental leave for both parents
• Extra paid days off for special occasions (e.g. your wedding or a move)
• Confidential support & coaching for you and your loved ones
• Annual company sports events
• Pension and life insurance
• Learning opportunities to grow your skills and career
• Corporate benefits and exclusive discounts
• An attractive referral program

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.