A Build Acceleration developer works on optimizing and accelerating the process of building and compiling code in software development. They focus on reducing the time it takes to compile, link, and test code changes, thus increasing the productivity of the development team. They employ various tools and techniques such as parallel processing, caching, and dependency analysis. They also work on improving build systems and scripts, and may be involved in developing and maintaining continuous integration/continuous deployment (CI/CD) pipelines. Their role is crucial in large-scale projects where build times can significantly affect the development cycle.