This is a long term project with millions of active users. Beside regular tasks for improving architecture and implementation of ever-growing complex set of features, I also introduced Continious Integration / Deployment, rewrote the entire codebase from Objective-C into Swift, helped in shaping the entire system architecture of the app itself and its related services (core, components, extensions, backend API etc.), introduced modularization based on Swift Package Manager and new technologies (like SwiftUI and Combine).