Join Mantu's Unified Communications team and help deliver the communication and collaboration services that support our global community. Working in an international and multicultural environment, you will play a key role in ensuring these services remain secure, reliable, and accessible to users worldwide. Your missions

Administer and maintain Microsoft Teams, Exchange Online and SharePoint Online across the group, including permissions, sharing settings and site lifecycle management
Manage Microsoft Teams Phone and VoIP services, including phone numbers, Teams Direct Routing, voice gateways, call routing, auto attendants and call queues
Manage Exchange Online mail flow and security controls, including anti-spam, anti-phishing, quarantine, retention and data loss prevention
Provide level 2 and level 3 support for messaging, collaboration and telephony incidents, and resolve them within agreed service levels
Monitor service availability, performance, message delivery and call quality, and implement corrective actions when needed
Contribute to Microsoft 365 deployment, migration and improvement projects
Document procedures, configurations and best practices in the internal knowledge base
Coordinate with technology partners and telecom operators to maintain service continuity

Your profile

Bachelor's degree or above in Information Technology, Computer Science or a related field
2-3 years of experience in Microsoft 365 administration, unified communications, messaging or collaboration services
Hands-on experience with Microsoft Teams, Exchange Online and SharePoint Online
Familiarity with SharePoint administration, Teams Direct Routing, voice gateways, SIP and PSTN connectivity
Experience with Exchange Online Protection or similar anti-spam and email security solutions
Experience with PowerShell, Microsoft 365 or unified communications certifications is a plus
Experience with generative AI tools is a plus
Native Vietnamese speaker with fluent English
Strong problem-solving skills and a service-oriented mindset, with the ability to manage several priorities in a fast-paced environment

What we offer:

An international community bringing together 110+ different nationalities
An environment where trust has a central place: 70% of our key leaders started their careers at the first level of responsibilities
A robust training system with our internal Academy and 250+ available modules
A vibrant workplace that frequently gathers for internal events (afterworks, team buildings, etc.)
At Mantu, sustainability is part of everything we do. You’ll have the opportunity to turn your ideas into action and make a tangible impact. Every day, our teams bring our ESG commitments to life, from reducing our footprint to driving positive change within our communities. Through our WeCare Together program, you’ll be empowered to design and lead projects that create real social or environmental impact, with the company’s full support.

Mantu 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.