A Load Balancer Developer designs, implements, and maintains software that evenly distributes network or application traffic across multiple servers. They ensure high availability and reliability by redirecting requests that come from clients in a network. They work on algorithms to distribute the load based on the server's current state, considering factors like server health, network latency, and the number of active connections. They also build systems for automatic failover and recovery, in case a server goes down. Furthermore, they often monitor and troubleshoot issues related to load balancing, ensuring optimal performance and minimal service disruption.