My team in Chrome Platform Security is hiring for a senior Android security expert - if you're into syscalls, binder, processes and other low level stuff you'd be perfect - I do this but for Windows and didn't know Chrome or much C++ when I started.

The ad is generic but feel free to ask questions - https://www.google.com/about/careers/applications/jobs/results/104891950447895238 - you'll be a part of a wider security team that works on lots of cool stuff and protects billions of people - https://www.chromium.org/Home/chromium-security/quarterly-updates/