Provide Tier-2 and Tier-3 support for accounting and business applications. Act as a subject matter expert across the application stack. Serve as the liaison between end users, vendors, and internal teams for escalated support and application lifecycle activities. Plan, coordinate, and execute application upgrades, patches, and maintenance events. Maintain and optimize application security groups, roles, and permissions. Document technical procedures, workflows, and support guides. Maintain strong relationships with vendor support teams. Participate in and lead changes through the ITIL change management process. Deliver outstanding customer service.