A Build/Bundling tools developer is responsible for creating and managing tools that package code into bundles for deployment. They streamline the software development process by automating tasks like compiling source code, running tests, and managing dependencies. They optimize code for performance, troubleshoot build errors and ensure compatibility across platforms and devices. They often work with tools like Webpack, Babel, and Grunt, and play a crucial role in maintaining the efficiency and reliability of the software development lifecycle. Additionally, they may create custom plugins or configurations to suit specific project requirements.