An Application Support Engineer in the L1.5 role requires a solid understanding of database management, various operating systems, and multiple programming languages. They are responsible for performing and managing basic to moderate production support tasks, including incident, change, and problem management, as well as monitoring production processing. The L1.5 role aligns with the ITIL framework and escalates to L2 or L3 based on the complexity of the incident or problem. In the L2 role, the Application Support Engineer takes on more complex production support tasks, requiring in-depth knowledge of the application, its functionality, and the underlying technology. They continue to manage incidents, changes, and problems, as well as monitor production processing. The L2 role also adheres to the ITIL framework and escalates to L3 when necessary