Perumal S
Summary
IT infrastructure professional with 13+ years of experience across diverse sectors, specializing in Windows Server, Active Directory, Azure AD, Exchange Online, Office 365, and email security. Expertise in systems administration, DNS, DHCP, and cloud-based security protocols. Strong leadership skills in resource optimization, customer relationship management, and team coordination. Proven track record in managing high-growth environments, including complex multi-domain IT infrastructures and large-scale enterprise systems. Ready to contribute to leadership roles in dynamic, challenging environments.
Overview
15
15
years of professional experience
1
1
Certification
Work History
Senior Associate, IT Infrastructure
National Payment Corporation of India
05.2021 - Current
- Responsible for managing IT infrastructure including Active Directory, Azure AD, DNS, DHCP, and Exchange Online for a large-scale financial organization.
- Manage NPCI’s forest-level domain with 5 child domains and domain controllers.
- Oversee Active Directory Sites & Services for Chennai, Mumbai, and Hyderabad locations.
- Create and manage group policies (GPO) and update RBAC documentation for user access control.
- Monitor and optimize Active Directory replication across multiple domains.
- Configure and manage Azure AD, implement conditional access policies for secure access, and manage Entra applications using OAuth 2.0, OpenID Connect, and SAML.
- Oversee Exchange Online email flow, SharePoint sites, and file server access management.
- Ensure security of email systems with SPF, DKIM, DMARC, and manage email security protocols.
- Implement Azure Information Protection for email data classification and manage McAfee security services (Endpoint Security, Threat Prevention, Drive Encryption).
- Collaborate with internal teams during audits and compliance checks.
- Perform proactive email flow management, IronPort gateway management, and security appliance updates.
- Automate scripts for deactivating stale Active Directory accounts and expired passwords.
- Handle mobile device management (MDM/MAM) through Intune for secure enterprise access and remote device compliance.
Active Directory Admin - IT Infra L2
Orient Technologies Ltd
08.2019 - 04.2021
- Company Overview: Client: National Payment Corporation of India
- Provided Active Directory and DNS management for NPCI through a dedicated IT team.
- Managed 5 internal AD servers with DNS and replication services across locations.
- Conducted Active Directory health checks, troubleshooting, and resolving synchronization issues.
- Created group policies and configured DHCP scopes as per organizational requirements.
- Handled Active Directory backups using Commvault solutions and ensured high availability of critical services.
- Integrated applications with Active Directory via LDAP protocols for SSO access.
- Client: National Payment Corporation of India
System Administrator
Karvy Innotech Ltd
05.2010 - 07.2019
- Company Overview: Formerly HCL Info Systems Ltd
- Responsible for maintaining the server infrastructure, DNS, DHCP, and email systems for internal systems.
- Configured and managed internal AD servers for high availability.
- Managed DNS and DHCP services across locations, including zone creation and record management.
- Implemented security hardening for Windows servers and maintained patch management schedules.
- Led disaster recovery drills and managed backup/restore procedures.
- Administered Proxy services (Squid) with customized policies for URL filtering and bandwidth control.
- Formerly HCL Info Systems Ltd
Education
Diploma - Electronics & Communication Engineering
MSPVL
Pavoorchatram04-2010
Higher Secondary -
Govt. HSC School
Eraniel04-2007
SSLC -
NVC Govt. HSC School
Radhapuram04-2004
Skills
- Active Directory (AD)
- Azure AD
- Exchange Online
- Office 365
- DNS
- DHCP
- File Servers
- Group Policy Management
- Email Security (SPF, DKIM, DMARC, IronPort, Barracuda)
- PowerShell Scripting
- Bash Scripting
- Automation
- McAfee Security (Endpoint, Threat Prevention, Drive Encryption)
- Citrix VDI Management
- Intune MDM
- Security Protocols: OAuth 20
- OpenID Connect
- SAML
- Backup Solutions: Commvault
- Automated Scripts
Certification
Microsoft Certified Solutions Associate
Cisco Certified Network Associate
Personal Information
Date of Birth: 04/05/89
References
Available upon request
Timeline
Senior Associate, IT Infrastructure
National Payment Corporation of India
05.2021 - Current
Active Directory Admin - IT Infra L2
Orient Technologies Ltd
08.2019 - 04.2021
System Administrator
Karvy Innotech Ltd
05.2010 - 07.2019
Diploma - Electronics & Communication Engineering
MSPVL
Higher Secondary -
Govt. HSC School
SSLC -
NVC Govt. HSC School
Similar Profiles
ARAVINTHAN MARAVINTHAN M
Senior Software Engineer at National Payment Corporation Of India (NPCI)Senior Software Engineer at National Payment Corporation Of India (NPCI)
BHAKTI PRADHANBHAKTI PRADHAN
Lead Business Development at National Payment Corporation of IndiaLead Business Development at National Payment Corporation of India
Hieu TrinhHieu Trinh
Intern at National Payment Corporation of Vietnam (NAPAS)Intern at National Payment Corporation of Vietnam (NAPAS)
VIKASH SHARMAVIKASH SHARMA
Senior Associate -L2 Infrastructure at Publicis SapientSenior Associate -L2 Infrastructure at Publicis Sapient
Balamurugan ThangarajBalamurugan Thangaraj
Senior Associate II, Infrastructure Specialist at Kyndryl Solutions Pvt. Ltd.Senior Associate II, Infrastructure Specialist at Kyndryl Solutions Pvt. Ltd.