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Looking for deep systems programing experience. This role is about taking things apart and seeing what makes them tick, not building new apps. (The initial coding challenge is reverse engineering a binary to find some magic numbers. It was probably the most fun interview question I've ever seen.) iOS-specific experience is a plus, but not a strict requirement. We use Objective-C with a small amount of Swift for the iOS-specific parts, and Rust for the core library that is shared between Android and iOS.