A typical day for a Cobol 400 developer involves maintaining, enhancing, and troubleshooting business applications running on the IBM AS/400 platform. You’ll often analyze user requirements, write or modify COBOL code, and conduct regular testing to ensure error-free operations. Interactions with business analysts, QA testers, and other IT professionals are common, as collaboration is key to translating business needs into technical solutions. Many teams follow structured workflows, such as Agile or waterfall methodologies, which means clear documentation and timely updates are essential. This role offers opportunities to participate in modernization projects, learn new technology stacks, and progress to senior developer or systems analyst positions over time.