Public summary
Seeking a Staff Mobile SDK Engineer for a white-label VPN platform in Germany. The role involves developing platform-specific SDKs for iOS and Android, focusing on networking and performance to enable secure VPN integrations. Candidates should have strong experience in mobile SDK development, Android (Kotlin) and iOS (Swift) programming, system-level APIs, clean API design, and testing practices. Experience with VPN technologies and mobile security is advantageous. The company values engineering autonomy, testing, and secure practices. Visa sponsorship is currently not available in the EU.
Responsibilities
Implement and maintain iOS and Android SDK wrappers for VPN functionality; collaborate on cross-platform API design; build abstractions to simplify VPN integration; optimize SDK performance for latency, stability, and battery efficiency; manage connection lifecycle and error handling; contribute to SDK architecture and extensibility; build and maintain demo applications; document components and implementation details; provide support to enterprise clients for integration issues.
Qualifications
Strong experience in mobile SDK and library development on iOS (Swift, Network Extension) and Android (Kotlin, VpnService); deep understanding of mobile networking and system-level APIs; expertise in designing clean, stable, developer-friendly SDK APIs; solid knowledge of software design principles and architectures; experience with unit testing and test-driven development; strong problem-solving and debugging skills. Preferred qualifications include VPN technology experience, working on B2B white-label platforms, and knowledge of mobile security best practices such as encryption and certificate pinning.