Senior Microsoft Teams Telephony Engineer at RedMatter Solutions LLC – Aldie, Virginia

We are seeking a technically experienced and solutions-driven Senior Microsoft Teams Telephony Engineer to lead the design, deployment, and operational support of Microsoft Teams Voice solutions in a secure, enterprise environment. This role is responsible for managing the full lifecycle of Teams Phone services, including Direct Routing, Operator Connect, and Session Border Controllers (SBCs), with a strong focus on AudioCodes Mediant platforms.

The ideal candidate will have deep experience in enterprise telephony, strong troubleshooting skills, and the ability to operate in highly available, mission-critical environments. This position partners closely with network, security, and operations teams to ensure reliable, secure, and scalable voice services

Responsibilities include:

• Design, deploy, and operate Microsoft Teams Voice solutions using Direct Routing and Operator Connect
• Configure, manage, and maintain AudioCodes Mediant Session Border Controllers (SBCs)
• Build and maintain enterprise dial plans, call routing policies, and number management services
• Implement and support Teams Voice features, including e911, call queues, auto-attendants, voicemail, and resource accounts
• Monitor voice infrastructure health, performance, and availability
• Perform platform upgrades, patching, and lifecycle management of telephony systems
• Maintain certificate lifecycle management and secure SIP/TLS connectivity
• Support integration of Teams telephony with enterprise network, identity, and security platforms
• Troubleshoot and resolve complex voice, SIP, and call quality issues
• Act as Tier 3 escalation for telephony incidents and outages
• Participate in incident response, root cause analysis, and service improvement initiatives
• Maintain technical documentation, standards, and operational procedures
• Support testing and validation of VoIP devices and Analog Telephone Adapters (ATAs)
• Collaborate with network, security, and operations teams on architecture and service design
  

Qualification Requirements:

• U.S. Citizenship required
• Active security clearance preferred; must be eligible and able to obtain a clearance
• Ability to pass background investigation and suitability requirements
• Availability to work onsite as required
• Willingness to participate in on-call and after-hours support as needed
• Bachelor’s degree in Information Systems, Computer Science, Engineering, or related field — or equivalent professional experience
• Minimum 8+ years of experience in enterprise telephony or unified communications
• Direct experience supporting Microsoft Teams Phone System in large-scale environments
• Strong experience with:
  • Microsoft Teams Admin Center
  • Microsoft 365 Admin Center
  • PowerShell scripting and automation
• Hands-on expertise with:
  • Microsoft Teams Direct Routing and Operator Connect
  • SIP, VoIP routing, and enterprise dial plan design
  • AudioCodes Mediant Session Border Controllers (SBCs)
• Experience deploying and supporting e911, call queues, auto-attendants, voicemail, and number management
• Proven ability to troubleshoot complex voice and networking issues
• Strong written and verbal communication skills
• Experience supporting multi-site enterprise voice environments