A developer designs, builds, and maintains web applications using the web server. They work with this open-source software to handle HTTP, Flash, and WebSockets, among others, to ensure efficient interaction between different internet protocols. The developer focuses on creating robust and scalable applications that can handle high-level concurrency and parallelism. They also conduct performance testing, troubleshoot issues, and implement necessary updates or patches. Additionally, they may work on integrating other software or databases with the server. Ultimately, their goal is to optimize the server's performance and ensure seamless user experience.