An Internationalization Developer is responsible for adapting software applications for different languages and regions. They design, implement, and manage software systems to function seamlessly across various international markets. Their tasks include coding for different languages, implementing features for locale-specific content, and ensuring the correct display of dates, currencies, and other regional elements. They work closely with translators and localization teams, ensuring software's cultural appropriateness. They also address issues related to character encoding, time zones, and language direction. Overall, their role facilitates the global usability and accessibility of software applications.