The ApkModExpert Dev at Bigo Technology Pte. Ltd. is responsible for creating and maintaining apks and mods for various mobile applications. The Dev works closely with the engineering team to develop and optimize mod files so that they are compatible with games and apps and function efficiently on Android devices. The Dev also collaborates with game/app publishers and developers to ensure that modifications are consistent with their guidelines and requirements. Additionally, the Dev is responsible for debugging and fixing any issues related to mod compatibility and functionality. The ability to understand the latest Android APIs, design patterns, and optimization techniques is essential for this position.