Mantu - Tomorrow Is Human

Telephony Administrator (PowerShell or C#)

Mantu is an international group providing guidance and services to businesses and entrepreneurs. It has more than 8,500 people from 95 different nationalities, spreading across 5 continents and more than 60 countries.

Mantu offers a range of high-value expert services: Leadership Advocacy & Shaping Advisory, Future of Work, Technology, Disruption & Growth, Online-Reputation & Digital marketing, Experience and Innovation. Mantu stands beside businesses and entrepreneurs to help them fulfil their dreams, achieve their ambitions and materialise their projects. Mantu bolsters their growth, enables their development and support their transformation.

Your role & responsibilities:

As Telephony Administrator, you are part of our IT Operations Department, your main responsibilities will be the deployment, the maintenance, and the support of the telephony infrastructure for Mantu Group and its subsidiary all around the world.

You will be responsible for performing administration and maintenance tasks related to Microsoft Teams, PBX and AudioCodes SBCs and O365 VOIP related topics. In addition of your exploitation tasks, you will as well be participating in the evolution of our worldwide infrastructure on managing different projects such as Direct routing and Calling plan in worldwide (over 60 countries), optimizing and troubleshooting the quality of internal and external calls, Call Center, and work with the team to bring our service on the next level of excellence. By joining our team, you will:

  • Support, maintain and optimize the deployed Microsoft Teams VOIP environment (+5000 users).
  • Support level 3 and maintain the deployed AudioCodes Voice Gateways, PBX and servers.
  • Define voice user policy, to ensure voice quality and call performance.
  • Resolve incidents, implement, and participate in the problem resolutions.
  • Implement service and system monitoring running on Grafana, Zabbix, and create reports and dashboard with Elasticsearch (ELK) stacks.
  • Define and develop documented procedures.
  • Automate recurrent administrative tasks to enhance our provisioning system (Powershell and C#)

Your skills & qualifications:

  • At least 2 years of experience on a similar position
  • Good automation logic and confident with PowerShell or C# (are plus)
  • Strong knowledge Microsoft Cloud services as MS Windows Server 2019, Azure Active Directory
  • Strong knowledge of VoIP solution as Microsoft Teams, AudioCodes SBC gateway, PBX
  • Good communication skills in English (oral and written communication)
  • Teamwork and knowledge sharing.
  • Analytical and Problems solving (troubleshooting)
  • Proactive and logical
  • Self-driven and motivate to learn new technologies

Mantu Group is proud to be an equal opportunity workplace. We are committed to promoting diversity within the workforce and creating an inclusive working environment. For this purpose, we welcome applications from all qualified candidates regardless of gender, sexual orientation, race, ethnicity, beliefs, age, marital status, disability or other characteristics. 

4 days ago


Lầu 15, toà nhà Viettel, 285 Cách Mạng Tháng 8, Phường 12, Quận 10, Thành phố Hồ Chí Minh

Year of experience

2 năm, 3 năm


Nhân viên

Job Type


Recruitment process

  • Round 1:

    Interview with Team Lead
  • Round 2:

    Interview with Technical
  • Round 3:

    Interview with HR



Lầu 15, toà nhà Viettel, 285 Cách Mạng Tháng 8, Phường 12, Quận 10, Thành phố Hồ Chí Minh

Company size



Tech stack