Tech stack:

• Microsoft Teams, Cisco Jabber, Cisco Webex
• Cisco CUCM (Call Manager), CUC (Unity Connection), CUPS (Presence), Cisco Unified Attendant Console, Apas Andtek Assistant Manager Server
  
• Windows Server (Active Directory, DNS, DHCP)
• Linux (CentOS, Ubuntu for UC appliances or monitoring tools)
• VMware vSphere / ESXi (virtualization of UC servers)
• Hyper-V (alternative virtualization platform)
  
  

Requirements:

• Minimum 8 years of experience in Unified Communications (UC) backend systems
• Proven track record in managing enterprise-grade UC platforms (e.g., Microsoft Teams, Skype for Business, Cisco CUCM)
• Experience in hybrid UC environments (on-premises + cloud)
• Deep understanding of SIP, VoIP, and UC protocols
• Proficiency in Windows Server and Active Directory administration
• Experience with virtualization platforms (VMware, Hyper-V)
• Strong scripting skills in PowerShell and/or Python
• Familiarity with Session Border Controllers (SBCs) and VoIP gateways
• Knowledge of networking fundamentals (QoS, VPN, SD-WAN)
• Hands-on experience with monitoring tools (PRTG, SolarWinds, CQD)
• Experience implementing PKI, TLS, and secure UC communications
• Understanding of data protection regulations (GDPR, ISO standards)
• Ability to manage identity and access via LDAP, SAML, OAuth2
• Bachelor’s degree in Computer Science, Information Technology, or related field
• Relevant certifications (e.g., Microsoft Certified: Teams Administrator Associate, Cisco CCNP Collaboration, ITIL Foundation) are a strong plus
• Proficient in English (B2 or higher)
• German language skills are a strong advantage
• Excellent communication and documentation abilities
• Capable of working cross-functionally with international teams
  

Project description:

Our customer is a German company specializing in comprehensive IT solutions, supporting enterprises in their digital transformation. With extensive experience, it offers high-quality services that include IT infrastructure management, business applications, and modern workplace (Digital Workplace) solutions. The company focuses on long-term relationships, tailoring services to meet clients’ specific needs, ensuring stability, security, and innovation. They operate throughout Germany, with its primary goal being to help clients achieve long-term success in a dynamic technological landscape. The company serves a wide range of clients, including large enterprises and organizations with complex IT needs and provides modern IT infrastructures and scalable cloud solutions, such as SAP and AI, customized to clients’ requirements. Our customer operates as a dynamic IT service provider, supporting the digital transformation of the German economy.

Main responsibilities:

System Management & Administration: 

• Install, configure, and maintain backend Unified Communications (UC) systems
• Administer UC platforms such as Microsoft Teams, Skype for Business, Cisco CUCM, or similar
• Manage server environments (Windows/Linux) supporting UC infrastructure
• Ensure high availability and optimal performance of UC services
• Planning, deploying, configuring, and managing Microsoft Teams
• Configure and manage Teams environments
• Administer teams, channels, chats, and apps
• Manage meetings and calling features
• Monitor, report on, and troubleshoot Teams performance and issues

Troubleshooting & Support:

• Diagnose and resolve complex UC-related issues across voice, video, and messaging systems
• Provide Tier 3 support and collaborate with service desk teams for escalations
• Monitor system health and proactively address potential disruptions
• Implement and manage security protocols for UC systems (TLS, PKI, SBC configurations)
• Maintain detailed documentation of system configurations, procedures, and incident logs