An AS400 operator performs a variety of tasks using IBM AS400 computer systems, such as data warehousing, corporate groupware services, Java application development, and web and e-commerce services. As an AS400 operator, your job duties are to configure the AS400 computer and server systems, plan and implement programs, conduct testing of applications running on the AS400 systems, perform troubleshooting, identify bugs, and deploy solutions. Additional responsibilities include operating and monitoring AS400 computer systems, maintaining system security, and informing your supervisor when problems arise.