idealo internet GmbH

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

In short

This Senior Backend Engineer role at idealo's CRM Tech team involves designing and maintaining scalable systems for CRM campaigns, identity resolution, subscriptions, and GDPR-compliant data flows. The company is idealo internet GmbH, an e-commerce/price comparison platform, based in Berlin. It requires strong Java (Spring Boot) or Kotlin experience, AWS cloud architecture knowledge, CI/CD and infrastructure-as-code skills, and familiarity with Kafka and event-driven microservices. The role also includes mentoring less experienced engineers and contributing to architectural decisions.

About the team
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
•Further education support: personal development goals taken seriously, with idealo Learning Hub, eLearning offerings (e.g., Udemy), coaching & mediation, and an additional learning and development budget.
•Office in the heart of Berlin with free organic breakfast, excellent free lunch (vegan and vegetarian), free coffee, lemonades and after-work beer, a foosball table, and a rooftop terrace with a view of Berlin for networking with colleagues from the group of companies.
•Free counseling and support in all areas of life (professional, private, family, health, etc.) in cooperation with pme-Familienservice.
•Job bike or Deutschlandticket for flexible, environmentally friendly commuting.
•Fitness and sports options such as Urban Sports or Gympass membership.
•Team events, company events, and other organized moments of connection throughout the year.

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