James introduces himself as the guest writer for a post about an open source project called TinyBase, which is a reactive data store for local-first apps. He announces the release of TinyBase v4.3, which integrates with PartyKit to provide both "local-first" and "sharing-first" functionality. The integration includes a server class for coordinating clients and persisting TinyBase store data in the cloud, as well as a client module for creating connections. A simple API allows users to create bindings between their PartyKit socket object and the TinyBase store. An example Todo App demo is provided to demonstrate the collaboration functionality, along with a starter kit for easy implementation. James thanks the PartyKit team for their support in developing this integration and encourages feedback from users.