Senior Android Engineer, AdTech (m/f/d)

About your tasks:

• Lead the design and development of scalable, maintainable, and high-performing Android applications using Kotlin and modern Android architecture patterns such as MVVM, MVI, and Clean Architecture.
• Define and evolve the Android application architecture, ensuring scalability, modularity, testability, and long-term maintainability.
• Drive the adoption and effective use of Jetpack Compose to build modern, declarative, reusable, and responsive user interfaces.
• Design and build reusable mobile components for Retail Media and advertising experiences, including Sponsored Products, Sponsored Brands, native placements, display banners, and personalized product recommendations.
• Integrate Retail Media placements naturally into product discovery, search, category, product detail, and other commerce journeys, balancing monetization objectives with a high-quality customer experience.
• Collaborate with backend, data, product, and ad server teams on APIs, tracking contracts, campaign metadata, targeting, attribution, and measurement requirements.
• Build flexible and configurable solutions that enable new ad formats, placements, campaigns, and monetization use cases to be introduced efficiently.
• Ensure best practices in modularization, code quality, testing, and performance optimization, define and evolve the app’s architecture, ensuring scalability and long-term maintainability
• Build reusable mobile components for Retail Media experiences, including Sponsored Products, Sponsored Brands, product recommendations, banners.
• Ensure engineering best practices across modularization, code quality, dependency management, observability, testing, security, and performance optimization.
• Improve CI/CD reliability, build performance, and release processes.
• Maintain clear and comprehensive documentation for architecture decisions, features, and technical processes
• Review and guide critical technical and architectural decisions, contributing to engineering standards and best practices across teams.
• Improve app stability, performance, and overall technical health.
• Reduce technical debt strategically while enabling product teams through platform improvements.
• Implement and evolve feature flags, experimentation frameworks, and A/B testing to validate new customer and advertising experiences through measurable outcomes.

About you:

• Extensive experience in Android development with strong expertise in Kotlin.
• Deep understanding of the Android SDK and modern Android development practices.
• Hands-on experience with: Jetpack Compose
  • Coroutines & Flow
  • Dependency Injection (Hilt/Dagger)
  • REST APIs (Retrofit/OkHttp)
• Strong knowledge of clean architecture principles, design patterns, and modularization
• Experience with testing (JUnit, Espresso, MockK) and writing maintainable, testable code
• Familiarity with CI/CD pipelines and modern development workflows
• Proven ability to take ownership of complex projects and deliver high-quality results independently
• Strong focus on performance, scalability, and user experience
• You collaborate effectively across teams and bring strong debugging and performance optimization skills.
• Experience working in Retail Media, AdTech, MarTech large-scale e-commerce platforms.

About your benefits:

In order to provide our employees with the best possible support for their individual needs, we offer a wide range of benefits:

• Sports: Stay healthy. Profit from a membership (M) package at Urban Sports Club, so that you can take advantage of a huge variety of sport offers.
• Mental Health: Get quick and professional help from psychologists of Likeminded if you feel overwhelmed in private or professional life. Anonymous and free of charge.
• Work from Home: If your job does not require you to be present in the office, we can arrange the place you work from individually - even for up to 20 days a year anywhere in the EU.
• Mobility: We provide our employees with a fully costed Deutschland Ticket which can be used at any time. Click here to learn more.
• Personal development: Grow! We support and encourage your individual development through various in- and external trainings.
• And many more :)