Senior Backend Engineer (m|w|d) - Java/Kotlin, AWS, Kafka

Team CRM Tech is responsible for delivering the technical infrastructure that enables idealo's CRM campaigns. They build and maintain systems that handle identity resolution, subscriptions, data flows, and message delivery, while ensuring GDPR compliance and supporting personalized user experiences.

About your new role

• Design, implement, and maintain reliable and scalable software systems and data flows for CRM and user engagement use cases.
• Collaborate with Software Engineers, Data Engineers, Product Managers, and other stakeholders to deliver robust solutions that integrate across domains and teams.
• Contribute to the team’s architecture and technical decision-making, ensuring high code quality and operational excellence.
• Take ownership of services throughout their lifecycle, from design and implementation to monitoring and improvement.
• Ensure best practices for testing, CI/CD, and cloud infrastructure are applied and continuously improved.
• Support and mentor less experienced engineers by sharing knowledge, conducting code reviews, and fostering a collaborative team culture.
• Explore and adopt new tools and technologies to improve development efficiency and system performance.

Skills & Requirements

• Strong experience in backend development with Java (Spring Boot) or Kotlin.
• Solid understanding of cloud - based architectures, preferably on AWS (e.g. Lambda, S3, Glue, SNS/SQS).
• Hands-on experience with CI/CD pipelines, infrastructure as code (e.g. AWS CDK, Terraform) , and monitoring.
• Familiarity with event-driven systems and tools such as Kafka , as well as microservice architectures.
• Good knowledge of SQL and experience handling structured and semi-structured data.

Nice-to-have:

• Experience working with data pipelines, APIs, and data integration processes (schemas, transformations, ETL).
• Experience with TypeScript or Snowflake.
• Experience with AI/LLM-assisted engineering (Claude, ChatGPT).

At idealo you can expect

• You want to further your education? We take your personal development goals seriously and, in addition to our idealo Learning Hub, eLearning offerings (e.g., Udemy), coaching & mediation, we also offer you the opportunity to benefit individually from additional learning and development budget.
• And what about the office? 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 view of the whole of berlin where you can network with colleagues from our group of companies.
• In need of additional support in any areas of your life? We offer free counseling and support in all areas of life (professional, private, family, health, etc.) in cooperation with the pme-Familienservice .
• You want full flexibility on your way to work and beyond? No problem with a job bike or Deutschlandticket - and it's environmentally friendly, too!
• Want to keep yourself fit? We offer many different fitness and sports options, such as an Urban Sports or Gympass membership, to suit your personal needs.
• And what else is there? Of course, 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!

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Posted Nov 02, 2026