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

Cologne, de💼 Full-time🗓 2026-09-04 → 2026-09-25

Core

Design and develop scalable, high-performing Android applications for Retail Media and advertising experiences, integrating sponsored products and personalized recommendations into commerce journeys.

Role type

Senior IC Android Engineer (AdTech)

Builds

Mobile app features for Sponsored Products, Sponsored Brands, native placements, and personalized product recommendations

Domain

Retail Media, AdTech, E-commerce

Deliverable

production ML models | product features

Required skills

Kotlin, Android SDK, Jetpack Compose, Coroutines & Flow, Dependency Injection (Hilt/Dagger), REST APIs (Retrofit/OkHttp), Clean Architecture, Modularization, Testing (JUnit, Espresso, MockK), CI/CD

Preferred skills

Experience with Retail Media/AdTech/MarTech large-scale e-commerce platforms, A/B testing frameworks, Feature flags

Technologies

Kotlin, Android SDK, Jetpack Compose, Android Jetpack, Coroutines, Flow, Hilt, Dagger, Retrofit, OkHttp, Ktor, Koin

Responsibilities

Lead design and development of scalable Android apps; Define and evolve Android application architecture; Build reusable mobile components for ad experiences; Collaborate on APIs, tracking, and attribution; Improve CI/CD reliability and app performance; Guide critical technical decisions

Seniority

Senior, hands-on IC

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