Senior Android SDK Engineer (m/f/x)

Senior Android SDK Engineer (m/f/x)

Department: osapiens Hub

Employment Type: Full Time

Location: Madrid

Reporting To: Head of Hub Engineering

Description

About osapiens At osapiens, more than 550 talented minds unite around one mission: enabling sustainable growth for businesses worldwide. Founded in 2018 and headquartered in Mannheim, Germany, we have built the AI-driven osapiens HUB - a multi-tenant platform hosting 26 enterprise-grade solutions designed for cross-company collaboration, automation, and compliance. With offices across Europe and the US, we are shaping the future of scalable and secure business technology.

Your Team

Join our Mobile Core Framework team to build and evolve the Android native layer of our mobile client SDK. You'll design and implement Java-based APIs that bridge native Android capabilities to React Native, enabling app developers across the company to build powerful, performant mobile solutions.

Your Responsibilities

• Design, build, and maintain native Android modules in Java that expose platform capabilities (offline sync, background services, device integrations) to React Native applications
• Own the React Native bridge layer, including native module architecture and threading considerations
• Optimize SDK performance with focus on memory management, battery efficiency, and app startup
• Stay current with Android platform evolution (new APIs, Jetpack libraries, Gradle tooling) and integrate relevant capabilities into the SDK
• Build and maintain automated test suites and CI/CD pipelines in Azure DevOps
• Collaborate with app development teams to understand their needs and provide excellent developer experience
• Contribute to SDK documentation and versioning strategy

Your Experience

• Strong proficiency in Java (17+) and the Android SDK (Activities, Services, Content Providers, background execution, Room/SQLite)
• Experience building libraries, SDKs, or frameworks consumed by other developers
• Familiarity with React Native native module development (or willingness to learn quickly)
• Solid understanding of Android application lifecycle, threading models, and performance optimization
• Experience with Gradle build systems and Android distribution
• English is our working language; fluency in written and spoken English is required

Nice to Have

• Experience with Kotlin and modern Android architecture (Jetpack Compose, Coroutines)
• Knowledge of TypeScript and React Native architecture
• Experience with offline-first mobile architectures and data synchronization
• Familiarity with CI/CD for mobile (Azure DevOps, GitHub Actions, or similar)
• Experience with Android/Java and/or Windows/C# development

Join us for this and more...

• A purpose-driven mission with and for global industry pioneers in tackling complex challenges
• Room for creativity through collaborative teamwork and an open communication culture
• Flexibility and team bonding with our hybrid work options
• Fuel for your growth journey, both personally and professionally
• Sustainable mobility options, promoting eco-friendly commuting solutions
• Fun team events and outings with our global teams
• Inspiring workspaces in Mannheim and beyond