Hiring a Google Guava developer can significantly boost your software development process. Guava is a robust set of libraries that can simplify coding and increase productivity. It provides utilities for tasks like collections, caching, primitives support, concurrency, common annotations, and string processing. A developer proficient in Guava can leverage these utilities to write cleaner, more efficient, and reliable Java code. Additionally, their knowledge can help in managing data collections effectively and implementing advanced programming concepts. This can lead to enhanced application performance, better memory management, and improved code readability.