Mobile apps and some architecture

This article discusses the architecture of mobile apps for a service that already has a web interface. It covers REST API design under a versioned namespace (`/api/v1`), custom error handling with multi-lingual support and silent error codes, authentication using Devise with custom session tokens and two-factor authentication, mobile device tracking via headers and logging, dynamic styling and font updates from the API for React Native apps, and a maintenance mode feature. The author shares practical experiences and invites discussion on additional necessary communication patterns between mobile apps and backend services.