A JSData developer primarily works with JSData, a frontend and backend agnostic tool designed to manage application data. They are responsible for creating, managing, and integrating JavaScript-based applications using JSData. Their tasks include setting up models and adapters, creating relationships between data, handling data transformations, and implementing CRUD operations. They might also be involved in troubleshooting and resolving issues related to data handling. They should have a strong understanding of JavaScript and knowledge of various databases. They often collaborate with other developers and stakeholders, ensuring the application data is structured, stored, and retrieved effectively.