An - Loadbalancer developer designs and implements software that distributes network traffic across multiple servers to enhance application performance and reliability. They work with Layer - of the OSI model, handling protocols such as HTTP, FTP, and DNS. Their responsibilities include ensuring seamless data flow, maintaining session persistence, managing SSL offloading, and implementing URL rewriting. They also ensure server health by monitoring and managing server load, and they troubleshoot any issues that arise. In addition to these, they often work closely with other IT professionals to achieve optimal application performance and security.