Must have Avaya and Five9 experience Senior Telecom Engineer Essential Functions and Responsibilities: Architecture, Design & Standards Own end-to-end voice/UC/CC architecture (on-prem PBX and Contact Center, futureUCaaS/CCaaS) including dial plans, call routing, auto attendants, hunt groups, voicemail, video, and fax.Define, document, and enforce configuration standards, security controls, versioning, and e911 policies across platforms and sites.Lead design reviews for Contact Center solution