Position

Lead (O365) Admin

Department

IT Infrastructure

Location

Chennai (Ascendas)

Employment Type

Full time Employee (FTE)

Job Summary

Responsible for the administration, maintenance, security, and optimization of Active Directory, Microsoft 365, and Google Workspace environments. Manage user lifecycle, identity and access management, messaging systems, collaboration platforms, security controls, and directory synchronization while ensuring high availability and compliance.

Key Responsibilities

Active Directory & Identity Management

- Administer Active Directory Domain Services (AD DS).
- Manage user accounts, groups, OUs, and Group Policies.
- Perform AD replication, troubleshooting, and health checks.
- Implement and manage DNS, DHCP, and Certificate Services.
- Manage ADFS, LDAP, and SSO integrations.
- Configure and support Azure AD Connect synchronization.
- Handle access reviews and role-based access control (RBAC).

Microsoft 365 Administration

- Administer Exchange Online, Teams, SharePoint Online, and OneDrive.
- Manage Microsoft Entra ID (Azure AD).
- Configure Conditional Access and Multi-Factor Authentication (MFA).
- Manage mail flow, connectors, relay servers, DKIM, SPF, and DMARC.
- Perform mailbox migration and tenant administration.
- Manage Microsoft Defender and security policies.
- Monitor and troubleshoot M365 service issues.





Google Workspace Administration

- Administer user accounts, groups, and organizational units.
- Manage Gmail, Drive, Meet, Calendar, and Shared Drives.
- Configure SSO, OAuth, and directory synchronization.
- Implement security policies and data retention controls.
- Manage email routing and coexistence with Microsoft 365.
- Support user migrations between platforms.

Security & Compliance

- Implement identity and access management controls.
- Manage MFA, SSO, Conditional Access, and Zero Trust policies.
- Monitor security incidents and audit logs.
- Support compliance requirements and security assessments.
- Coordinate VAPT finding remediation related to identity platforms.

Operations & Support

- Handle L2/L3 incidents and problem management.
- Develop SOPs, KT documents, and operational runbooks.
- Coordinate with vendors and application teams.
- Support CAB-approved changes and infrastructure upgrades.
- Participate in DR drills and business continuity activities.

Technical Skills

Mandatory

- Active Directory, DNS, DHCP, GPO
- Azure AD / Microsoft Entra ID
- Exchange Online
- Microsoft 365 Administration
- Google Workspace Administration
- Azure AD Connect
- ADFS & SSO
- PowerShell Scripting
- MFA & Conditional Access
- Email Security (SPF, DKIM, DMARC)

📌 LeadAdmin / Chennai / immediate joiner
🏢 Mount Talent Consulting
📍 Chennai