A Google URL Shortener developer creates and maintains software tools that condense long URLs into shorter, more manageable versions. They design algorithms to generate unique and short URLs that redirect to the original page. Their work involves ensuring the stability and speed of the redirection process. They also implement security measures to avoid any potential misuse or spamming. Additionally, they may create features to track clicks or views on the shortened URL for analytical purposes. Furthermore, they constantly monitor and update the system for optimal performance and user experience.