(Senior) Backend Developer

As a (Senior) Backend Developer in our Product Creation & Assignment Team, you will help us build the systems behind the automated expansion of the idealo product catalogue.

At idealo, products are the comparable entities users see on our platform: product pages where offers from different shops are grouped, enriched, and made comparable. Our team builds systems that identify and create new products from various data sources and assign incoming shop offers to the right existing or newly created products.

We work on a modern, cloud-native stack combining JVM-based backend services with data-intensive AWS workflows: Java, Kotlin, Spring Boot, Kafka, MongoDB, and EKS, as well as Python-based pipelines using MWAA, Lambda, Step Functions, DynamoDB, Glue Spark, and S3. We also integrate ML models and GenAI components into our production systems and actively use AI tools such as Claude Code in our development workflow.

About Your New Role

• You develop and operate backend services and data workflows for automated catalogue expansion and offer assignment, taking full lifecycle ownership from architecture through to production.
• You work on systems that identify, create, and enrich new products from various data sources, and improve the matching logic that links shop offers to the right idealo products.
• You build with our core stack: Java/Kotlin, Spring Boot, Kafka, AWS, Kubernetes/EKS, and Python-based pipelines (MWAA, Lambda, Step Functions, Glue Spark).
• You ensure high software quality through automated testing, code reviews, and observability, and use AI-assisted development tools thoughtfully.
• You collaborate closely with Engineering, Product, and Machine Learning Engineering, and share knowledge through reviews, pairing, and documentation.

Skills & Requirements

• Several years of experience in backend, platform, or data-intensive software development with responsibility for production systems.
• Strong hands-on experience in JVM backend development (Java or Kotlin, ideally Spring Boot) or Python-based data workflows, with good working knowledge of and willingness to contribute across both stacks.
• Experience operating services in cloud-native environments, ideally with AWS, Kubernetes, Docker, or serverless components.
• Familiarity with event-driven or workflow-based architectures such as Kafka, Step Functions, MWAA/Airflow, or ETL-like pipelines.
• Clear communication skills, ability to work effectively in a cross-functional team, and fluent English. German is a plus.
• You challenge assumptions respectfully and use data and reasoning to debate ideas—then fully commit once a decision is made to ensure alignment and momentum.

At idealo You Can Expect

• Education & Development: We take your personal development goals seriously. In addition to our idealo Learning Hub, eLearning offerings (e.g., Udemy), coaching & mediation, we also offer you the opportunity to benefit individually from an additional learning and development budget.
• Office Perks: Our office in the heart of Berlin offers free organic breakfast, excellent free lunch (vegan and vegetarian), as well as free coffee, lemonades, and after-work beer, in addition to the "standard foosball." It also has a fabulous rooftop terrace with a view of the whole of Berlin where you can network with colleagues from our group of companies.
• Life Support: We offer free counseling and support in all areas of life (professional, private, family, health, etc.) in cooperation with the pme-Familienservice.
• Commute Flexibility: No problem with a job bike or Deutschlandticket – and it's environmentally friendly, too!
• Wellness: We offer many different fitness and sports options, such as an Urban Sports or Gympass membership, to suit your personal needs.
• Community: Success must be celebrated! In addition to team events, you can also expect big company events and other moments of organized connection with others in the company and your team throughout the year!