Android Expertise:- Deep knowledge of the Android API: Knowledge and experience with the entire public Android API- Extensive experience in specific APIs: Experience in working with the audio system, Bluetooth, contacts, background services, integration with system intents, Home screen widgets, custom Home screen, etc.- VoIP stack running as native code: Experience with VoIP (SIP and media) stacks on Android, running as native code. Performance-optimized communication between native C and Java code.- Internal telephony APIs: Deep knowledge of the internal telephony APIs on Android, accessed with protected signature; integration with dialer and phone-related intents and user experience.- OEM-preloading: Experience with OEM-preloaded packages, testing and release cycle- USB LAN Interface: Experience with tethering and Motorola’s USB LAN interface.- Building custom OS images: Ability to review the full source of the Android platform, build and deploy custom images as needed for spec