A Linux Red Hat/SUSE/Ubuntu developer is responsible for designing, implementing, and managing both server and client-based applications. They work with open-source operating systems, primarily Red Hat, SUSE, and Ubuntu, to develop software and systems. Their tasks include writing and debugging code, maintaining system security, troubleshooting issues, and updating system software. They also work on system integration, customization, and optimization. They collaborate with other team members to develop and test software, as well as provide system support. They need to be familiar with Linux command line, shell scripting, and various programming languages.