Responsible for the day-to-day support and maintenance of the Messaging/Presence application systems in operation escalated from tier 1/2 levels. This includes tasks related to identifying and troubleshooting application issues and issues resolution or escalation. Responsible for coaching and mentoring less experienced team members. In depth functional knowledge of the application(s) supported and interdependencies. Provide on-call support for tier 2/3 related issues (including weekend on-call responsibilities). Participate in team project work including BAU project activities such as mergers/acquisitions/diverstitures. Microsoft 365 administration, Exchange hybrid environments, Microsoft Teams (including Voice), Power Platform, Azure AD, Intune, Microsoft Defender, PowerShell scripting, and cloud infrastructure architecture.