Mobile SDK Architecture and API Design Questions

Design principles and operational practices for building and evolving mobile software development kits and client libraries. Topics include clean public API design, backward compatibility and versioning strategies, minimizing binary size and startup overhead, packaging and distribution for Android and iOS, error handling and observability, thread safety and concurrency expectations, asynchronous API patterns, testing and continuous integration for SDKs, and strategies to minimize client upgrade friction. Candidates should be able to design an SDK interface for a common mobile feature justify design choices and propose approaches for compatibility and performance monitoring.