As Android Engineering Lead at Readdle, I led the team that brought Spark Mail to Android - sharing a single Swift codebase for business logic across iOS, Android, Mac, and Windows. We built the Swift Android Toolchain, an open-source stack of seven repositories covering everything from the SDK and JNI code generation to NDK bindings and build tools.
Over seven years the platform matured from a forked compiler to upstream Swift 6 with all architecture targets. Together with the Swift Android community, this work contributed to Swift on Android becoming an officially supported platform on swift.org and the formation of the Swift Android Working Group.