An Identity Federation developer specializes in creating and managing systems that allow for secure sharing of identity and authentication data across multiple IT systems or organizations. They design protocols that enable single sign-on (SSO) where users can access various applications with one set of login credentials. They work with technologies like SAML, OAuth, and OpenID. Their role also involves ensuring the security of users' data and compliance with privacy regulations. They collaborate with other developers to integrate these identity solutions into applications and troubleshoot any issues that may arise. They also continually update their knowledge of emerging identity and access management technologies.