A cluster computing developer designs, implements, and manages computing clusters - groups of connected computers that work together, enhancing processing speed or data integrity. They handle tasks such as system configuration, performance tuning, and software installation. They work with distributed computing technologies, like Hadoop or Spark, to process and analyze big data efficiently. The developer ensures high availability and scalability of the cluster, handles system troubleshooting, and maintains security. They also monitor the cluster performance and implement backup or recovery procedures. Their work aids in solving complex computational problems and processing large data sets faster.