An Authentication and Authorization Developer designs, implements, and maintains systems that validate user identities (authentication) and control their access to resources (authorization). They create secure login mechanisms, ensure data encryption, and implement protocols like OAuth, SAML, or JWT. They also define user roles and permissions, ensuring only authorized individuals can access certain data or perform specific actions. They work with other developers to integrate these security measures into applications and systems. They also monitor and update these systems as needed, keeping up with new security threats and compliance requirements. They play a crucial role in protecting user data and privacy.