The Lead Engineer is responsible for developing and delivering code, maintaining existing features, troubleshooting bugs, and resolving ad-hoc requests. They provide support for enhancements and new developments based on business and client requirements, as well as from the functional and technical teams. The engineer offers client support through data presentation, ticket resolution, and daily support activities, including monitoring client requirements and tracking schedules. Additionally, they perform activities related to enhancement creation of documents for CMMI and client requirements and provide technical guidance to junior developers. They interact with customers and internal teams to gather requirements for development purposes.