A new SDK (Software Development Kit) developer's role involves creating, maintaining, and improving software development kits that provide the tools, guidelines, and libraries developers need to build applications on specific platforms. They design and implement APIs, ensuring they are user-friendly and efficient. The SDK developer also documents the functionalities of the SDK for ease of use by other developers. They collaborate with other developers to improve the SDK and troubleshoot any issues that may arise. Additionally, they stay updated on the latest programming languages and technologies, ensuring the SDK remains relevant and competitive.