To thrive as an AS400 COBOL professional, you need strong expertise in COBOL programming, AS400 (IBM iSeries) operations, and relational database concepts, often backed by a degree in computer science or a related field. Familiarity with tools such as IBM Rational Developer, SQL, and source control systems, as well as certifications like IBM iSeries certification, are highly valued. Strong analytical thinking, effective communication, and a collaborative mindset help professionals excel when troubleshooting applications and working with cross-functional teams. Mastering these skills ensures reliable maintenance of legacy systems, successful project delivery, and seamless integration with newer technologies.