Senior Backend Engineer (Kotlin/Java, AWS) – Affiliate-Services (f|m|d)

As part of our Clickout-to-Revenue team, you help shape the very heart of idealo – our monetization processes. We collaborate with around 50.000 e-commerce partners across Europe, ranging from niche specialist shops to major marketplaces like Amazon and eBay. Through idealo’s price comparison platform, our partners gain access to millions of users – with over 560 million product listings available on idealo.de alone.  

idealo is actively expanding its strategic partnerships and continuously acquiring new online shops through affiliate platforms. Our focus lies on the technical integration of these platforms, as well as the reliable synchronization and enrichment of the data they provide. 

Our goal is to evaluate the performance of our affiliate campaigns with precision and transparency. Based on these insights, we develop targeted measures to further enhance the visibility and success of our partners’ offers on idealo. 

Are you eager to make an impact and help shape the e-commerce experience for both our partners and users? Then we’d love to hear from you! The position of Senior Backend Engineer (f|m|d) is available as a full-time or part-time role.  

About your new role  

End-to-End Ownership  

• You develop and operate business and web applications running in the AWS Cloud.

• Together with your team, you take full responsibility across the entire value chain (YBYO): architecture, infrastructure, development, testing, security, deployment, monitoring, on-call duty, and maintenance.  

Product Focus: Building Scalable Affiliate Tracking 

• You will work on integrating new affiliate platforms with the goal of ensuring reliable and automated tracking of clickouts. 

• You will extend and develop systems for enriching and validating tracking data to enable precise performance analysis — the foundation for data-driven decision-making in our affiliate business. 

Agile Collaboration 

• You work in an agile engineering team with short release cycles and close collaboration with the product lead, accounting, and other stakeholders.  

• Pair programming, pull requests, code reviews, and regular feedback are second nature to you.  

Technical Excellence 

• You actively contribute ideas for improving processes, care deeply about code quality, and continuously develop your skills – we support you with a range of professional development opportunities  

Skills & Requirements

Must-haves  

• 7+ years of experience in web application development, including at least 5 years with Kotlin/Java .

• Strong knowledge of AWS architecture and Infrastructure as Code using Terraform.

• Experience with container orchestration using Kubernetes.

• Experience building Lambda functions for data processing (Python, TypeScript) .

• Solid understanding of relational (PostgreSQL, MySQL) and document-oriented databases (MongoDB, DocumentDB).  

• You write clean, maintainable code and apply SOLID principles . 

• You take full end-to-end ownership and can clearly communicate technical concepts – even to non-technical stakeholders.  

• You enjoy working in a team, sharing knowledge, giving constructive feedback, and collaborating through pair programming and code reviews.  

• Fluent German and English skills.

Nice-to-haves  

• Experience with affiliate service implementation (e.g. AWIN). 

• Background in eCommerce .

• Familiarity with monitoring and observability tools (e.g., Grafana/Loki, OpenSearch).  

• Expertise in applying cloud security best practices.

At idealo you can expect

• You need vacation? We offer you 30 days of vacation. Not enough? You can "buy" an additional 15 days every year by converting your salary and it's seen as a positive thing.

• 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!
  

About idealo

idealo is a Berlin success story: in 2000 we started out with the mission of helping consumers make the best purchasing decisions. Today, with ~2.5 million visits per day, ~50,000 shops, and more than ~500 million product offers, we are one of the most popular German e-commerce websites and one of the leading European shopping and comparison platforms. We are active as a price comparison platform in six countries (Austria, France, Germany, Great Britain, Italy, and Spain).
We are located in the heart of Berlin and offer a unique idealo spirit. Your ideas are the driving force that moves our business forward. Not only our product portfolio is diverse, but also the people who work on it. We want you just as you are! Origin, religion, gender, sexual orientation, or a degree of disability are irrelevant.
If you are passionate about improving the world of online shopping alongside ~1000 idealos from ~60 nations, apply with us today.

Information for applicants with severe disabilities: As an applicant with a severe disability, you can get advice from our Representative Body for Severely Disabled People (SBV) during the application process. Please inform us regarding this topic.

For the inclusion of people with disabilities, our office is accessible without steps. When you start with us, we will see what else is needed!

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