Senior Android Engineer (Growth & Revenue)

TL;DR

Senior Android Engineer (Growth & Revenue): Deliver high-quality, scalable mobile apps and web features for language learning experiences with an accent on Android development, in-app purchases, and growth-focused functionality. Focus on building end-to-end user experiences, optimizing architecture for maintainability, and integrating AI tooling to accelerate workflows.

Location: Berlin office with flexible hours and remote-friendly options (up to 3 months inside the EU and UK via Jobbatical)

Company

Digital language learning platform with 60,000+ lessons across 15 languages, serving millions of users worldwide from HQs in Berlin and New York.

What you will do

• Deliver high-quality, scalable mobile apps by contributing to discovery and delivery of new Android and web features.
• Build end-to-end learning experiences in a user-focused team.
• Collaborate cross-functionally on UX, API design, and technical decisions.
• Participate in code reviews, pair programming, knowledge-sharing, and feature demos.
• Maintain and improve Android app technology stack and infrastructure.

Requirements

• Developed several Android apps using Kotlin, Java, Jetpack libraries (Compose, Lifecycle), DI (Dagger), Retrofit, WorkManager, Testing (Espresso, Mockito, UI tests).
• In-depth knowledge of design patterns, especially MVVM architecture.
• Experience with Coroutines/Flows and RxJava/RxKotlin.
• CI/CD pipelines experience (Fastlane, Bitrise, Github Actions).
• Google Play Billing and in-app purchase flows, including subscriptions and paywalls.
• Fluency in written and spoken English.
• Experience mentoring engineers and ensuring high-quality delivery through processes and tooling.

Nice to have

• MVI architecture pattern.
• Hilt for dependency injection.
• Kotlin Multiplatform (KMP).
• KSP for code generation.

Culture & Benefits

• 30 vacation days + 3-month sabbatical option, family/life counseling.
• Flexible hours, remote up to 3 months in EU/UK, office with nap/faith/family rooms.
• Learning budget, free hirify.global access, internal opportunities.
• Mobility benefits, discounted Urban Sports Club.
• Employee communities (FLINTA, DE&I, LGBTQIA), social/cultural events.