Multi-tenancy in B2B applications, which allows multiple organizations to be served from a single codebase, is becoming increasingly essential for driving revenue and growth. This capability, once exclusive to enterprise-level software, is now expected in even smaller-scale business apps. Notion, Slack, and Asana exemplify successful multi-tenancy integration. The text provides a detailed guide on implementing multi-tenancy in a React Native and Expo app using Clerk and Supabase, focusing on setting up user-friendly organization management features. The process involves enabling organization features, implementing organization switchers, and updating security models to ensure data privacy among tenants. Clerk simplifies multi-tenancy by offering APIs for organization management, allowing developers to focus on core functionalities. A demonstration is given using a time tracking app, Aika, where multi-tenancy is integrated to allow users to manage and switch between organizations seamlessly. Additionally, the guide outlines updating Row-Level Security policies in Supabase to use organization IDs, ensuring data is tied to the correct tenant.