Entry level mainframe developers typically assist with maintaining, enhancing, and troubleshooting mainframe applications, often working with senior team members on code updates, testing, and documentation. Day-to-day responsibilities may include writing or modifying programs in COBOL, JCL, or similar languages, performing data analysis, and helping with batch job scheduling. You'll often collaborate with business analysts, QA teams, and other developers to meet project requirements and ensure seamless system performance. This role provides valuable hands-on experience with enterprise-scale systems and serves as a great foundation for long-term IT careers.