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

Redcare Pharmacy; Köln; Hybrid; EUR 90,000 - 130,000; Full time

Benefits offered by this job

Urban Sports Club membership

Mental Health support Likeminded

Work from home up to 20 EU days/year

Deutschland Ticket (public transport)

Personal development programs

Job summary

Redcare Pharmacy is seeking a Senior Mobile Engineer to lead Android/iOS development for Retail Media and sponsored advertising experiences. You will design scalable mobile experiences, implement native ads, personalized recommendations and integrate monetization within a best-in-class shopping app across Europe.

You will collaborate with Product, Backend, Data and Ad Server teams to deliver performant, customer-centric mobile solutions.

Qualifications

• Strong Android/Kotlin experience with modern architecture.
• Hands-on with Jetpack Compose and coroutines.
• Experience in app architecture, modularization and testing.
• Familiarity with CI/CD and performance optimization.

Responsibilities

• Lead design and development of scalable Android apps using Kotlin and MVVM/Clean Architecture.
• Define and evolve Android architecture for scalability and testability.
• Champion Jetpack Compose for modern UIs and reusable components.
• Build Retail Media and advertising experiences within the app.
• Integrate ad formats, product discovery, search and commerce journeys.
• Collaborate with backend, data, product and ad-server teams on APIs and campaigns.
• Enable new ad formats and monetization use cases with configurable solutions.
• Maintain code quality, testing, security and performance.
• Improve CI/CD reliability, build performance and release processes.
• Document architecture decisions and cross-team guidelines.
• Drive technical excellence and reduce debt while enabling product teams.

Skills

Kotlin

Android SDK

Jetpack Compose

MVVM / Clean Architecture

Coroutines & Flow

Dependency Injection

REST APIs

Testing

CI/CD

Performance optimization

Debugging

Retail Media

Tools

Retrofit/OkHttp

Ktor

Dagger/Hilt

Job description

Company Description

About Redcare Pharmacy: As Europe's No.1 e-pharmacy, Redcare Pharmacy is powered by passionate teams and cutting-edge innovation. We strive to create a healthy, collaborative work environment where every employee feels valued and inspired to contribute to our vision "Until every human has their health". If you're seeking a career that offers purpose and aligns with your values, join us and begin your #Redcareer today.

About the role

As a Senior Mobile Engineer (Android/iOS), you will play a key role in building the next generation of Retail Media and sponsored advertising experiences within the Redcare mobile platform. Working as part of a cross-functional product team, you will design and build scalable mobile experiences that seamlessly integrate sponsored products, personalized recommendations, native advertising, and campaign-driven customer journeys while maintaining a best in class shopping experience.. You will have high visibility and a direct impact on how our Android ecosystem evolves as we scale. You'll collaborate closely with Product Managers, Designers, Backend Engineers, Data Scientists, and Retail Media stakeholders to deliver performant, scalable, and customer-centric mobile solutions used by millions of customers across Europe.

About the Tech Stack

Kotlin, Android SDK, Jetpack Compose, Android Jetpack (ViewModel, Navigation, DataStore), Coroutines & Flow, Hilt (Dagger), Retrofit/OkHttp, Ktor, Koin. Any cross platform is add-on

Job Description

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.

Qualifications

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.

Additional Information

About your 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 :)