Senior Software Engineer (Kotlin/AWS) – Cataloging (w|m|d)

The Cataloging Team is responsible for the holistic, fully automated assignment of shop data to our catalog structure. Our systems classify over 2 billion offers by category and product type, recognize manufacturer information and product properties, and integrate them into the idealo product catalog. We combine classic backend development with modern machine learning approaches, always following the principle: You build it, you run it. You will work in an environment where you not only write code but also take responsibility for the entire technical chain – from architecture to deployment and operation in a cloud-native AWS environment. As part of our team, you benefit from weekly knowledge exchange slots, individual strengths coaching, and a culture based on humor, honesty, curiosity, and mutual trust.

Must Have

• Responsible for the continuous development of backend services and expansion of AWS infrastructure in coordination with Product, ML, and Data.
• Implement Infrastructure as Code (IaC), automated deployments via CI/CD pipelines (GitHub Actions), and ensure stable operation of Apache Kafka, MongoDB, and CloudWatch.
• Analyze existing systems, identify optimization potential, and ensure solutions are performant, scalable, and secure.
• Develop new solutions, drive the transition to modern cloud patterns, and actively contribute knowledge of new technologies.
• Support colleagues with onboarding, share knowledge with working students, and foster an environment of learning and growth.
• Several years of experience in backend development, ideally with Kotlin.
• Deep knowledge of AWS (EC2, EKS, S3, VPC).
• Sound knowledge of Infrastructure as Code, especially with AWS CDK (TypeScript).
• Experience with CI/CD workflows (e.g., GitHub Actions).
• Proficient in Kotlin, Java, or TypeScript.

Good to Have

• First experience in frontend/client development with React.
• Interest in serverless architectures and modern cloud concepts.
• Enthusiasm for automation, machine learning, and data-driven systems.

Perks & Benefits

• 30 days of vacation, with the option to 'buy' an additional 15 days annually.
• Personal development support including idealo Learning Hub, eLearning (Udemy), coaching, mediation, and individual learning budget.
• Office in Berlin with free lunch, coffee, lemonades, after-work beer, foosball, and a rooftop terrace.
• Job bike or Deutschlandticket for flexible and environmentally friendly commuting.
• Visa process and relocation support for international applicants.
• Various fitness and sports options, such as Urban Sports or Gympass membership.

Job Description

In the Cataloging Team, we are responsible for the holistic, fully automated assignment of shop data to our catalog structure. Our systems classify more than 2 billion offers by category and product type, recognize manufacturer information and product properties, and integrate them into the idealo product catalog.

We combine classic backend development with modern Machine Learning approaches – always with the principle: You build it, you run it.

You work in an environment where you not only write code but also take responsibility for the entire technical chain – from architecture to deployment to operation in a cloud-native AWS environment.

As part of our team, you benefit from weekly knowledge exchange slots, individual strengths coaching, and a culture based on humor, honesty, curiosity and mutual trust.

Your Tasks & Responsibilities

• Further Development & Architecture: In close coordination with Product, ML, and Data, you are responsible for the continuous further development of our backend services and the expansion of our AWS infrastructure.

• Cloud & Automation: You rely on Infrastructure as Code (IaC), automated deployments via CI/CD pipelines (GitHub Actions), and take responsibility for the stable operation of central components such as Apache Kafka, MongoDB, and CloudWatch.

• Performance & Security: You analyze existing systems, identify optimization potential, and ensure that our solutions are performant, scalable, and secure.

• Innovation & Evolution: Together with your team, you develop new solutions, drive the transition to modern cloud patterns, and actively contribute your knowledge of new technologies.

• Mentoring & Team Spirit: You support colleagues with onboarding, share your knowledge with working students, and foster an environment where learning and growth are natural.

Requirements & Skills

Must-Have

• Several years of experience in backend development, ideally with Kotlin

• Deep knowledge of AWS (EC2, EKS, S3, VPC)

• Sound knowledge of Infrastructure as Code, especially with AWS CDK (TypeScript)

• Experience with CI/CD workflows (e.g., GitHub Actions)

• Proficient in Kotlin, Java, or TypeScript

• Strong communication skills, authenticity, and enjoyment in jointly solving complex tasks

• You question the status quo, think holistically, and proactively drive topics forward

Nice-to-Have

• First experience in frontend/client development with React

• Interest in serverless architectures and modern cloud concepts

• Enthusiasm for automation, Machine Learning, and data-driven systems

Job Requirements

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 excellent free lunch, 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.

• 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!

• You don't live in Germany yet? We support you in the visa process and with your relocation.

• 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.

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 ~700 idealos from ~60 nations, we are happy to receive your application!

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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