The AS400 Lead Developer position at Infosys involves leading a team in the design, development, and maintenance of AS/400 applications. The role requires a strong background in AS/400 technologies, particularly RPG, CLI, and DB2, and focuses on delivering high-quality software solutions while collaborating with various stakeholders. The selected candidate will be responsible for requirements elicitation, creating application architecture documents, reviewing team deliverables, and ensuring adherence to SDLC guidelines.