Summary

Overview

Work History

Education

Skills

Certification

Timeline

RAMAKRISHNAN ADHIYAMAN

IAM SPECIALIST

Hoofddorp,NH

Summary

Adept at leading complex IT projects, I spearheaded the migration to Cloud Authentication at Tata Consultancy Services, significantly enhancing security. My expertise in PowerShell scripting and identity management, coupled with a knack for mentoring teams, underscores my ability to deliver impactful solutions and foster technical growth.

Overview

years of professional experience

Certifications

Work History

Associate Consultant

Tata Consultancy Services

07.2019 - Current

Led the successful migration from Federated Authentication to Cloud Authentication, enhancing security and user experience.
Expertly migrated applications from ADFS and ISAM to EntraID, ensuring minimal downtime and seamless user transitions.
Extensive experience with OpenID Connect, OAuth, SAML, and Header-based applications, ensuring secure and efficient authentication mechanisms.
Migrated applications to EntraID Application Proxy, optimizing secure remote access to on-premises applications.
Utilized Microsoft Graph and PowerShell SDK to manage and automate EntraID operations, enhancing efficiency and reducing manual workload.
Upgraded Azure AD Connect and resolved sync errors, ensuring seamless identity synchronization between on-premises and cloud environments
Created and managed Service Principal Names (SPNs) for task delegation in EntraID through Microsoft Graph, enhancing security and access management.
Managed Privileged Identity Management (PIM) and conducted Access Reviews to ensure appropriate access levels and compliance with security policies.
Experienced in KQL scripting to analyze and extract valuable insights from Sentinel logs, supporting proactive threat detection and response.
Designed and configured Administrative Units to streamline delegation and management of resources within EntraID.
Performed FRS to DFRS Sysvol Migration, ensuring efficient and reliable SYSVOL replication.
Configured Network Policy Server (NPS) by creating network policies, conditions, and reviewing logs to ensure secure and compliant network access control.

Lead Administrator

Wipro Technologies Ltd

08.2017 - 07.2019

Primary responsibility for handling L3 incidents, ensuring timely resolution within SLA to maintain system stability and uptime.
Engaged in P1 and P2 incident tickets, consistently meeting deadlines and ensuring high-priority issues are resolved promptly.
Provided comprehensive Active Directory support for over 5,000 Windows servers globally in a 24x7 environment, ensuring continuous and reliable access management.
Served as the Technical Team Leader for a 20-member team, guiding and mentoring team members to improve performance and technical expertise.
Assisted the L2 support team with complex technical issues, providing expertise and support as needed.
Actively participated in bridge calls with application teams to diagnose and resolve application-related issues, ensuring minimal disruption to business operations.
Logged and managed complaints with Microsoft and other vendors, coordinating resolution efforts to address underlying issues.
Documented new issues and solutions, maintaining an up-to-date knowledge base to facilitate faster incident resolution and improve team efficiency.
Conducted detailed Root Cause Analysis (RCA) for recurring issues, providing insights and recommendations to prevent future occurrences.
Responsible for automating day-to-day activities using Windows PowerShell, reducing manual effort and increasing operational efficiency.
Created and managed SQL Always On clusters, ensuring high availability and disaster recovery for critical databases.
Monitored ServiceNow incident and email queues, prioritizing tasks based on severity and business impact to ensure timely resolution

InfraTechnology Specialist

Cognizant Technolgies Ltd

09.2013 - 07.2017

Led domain migration projects, including the consolidation of multiple forests and domains, ensuring smooth transitions with minimal disruption.
Planned and executed the decommissioning of Domain Controllers, maintaining the integrity of the Active Directory infrastructure.
Directed datacenter and domain migration projects, including server migrations using Platespin.
Automated administrative tasks and data gathering with PowerShell, and managed Active Directory user migrations.
Extensive experience in DNS management, Group Policy creation, OU structure design, and Sites configuration.
Migrated Conditional Forwarder to Secondary Zone DNS, reducing TTL refresh time and improving DNS performance.

System Engineer

Sify Technologies Ltd

06.2011 - 08.2013

Provided remote support for over 300 servers, managing Windows Server 2003, 2008, and 2008 R2.
Configured and managed IIS, FTP, and Active Directory services, including group policies, OUs, and user accounts.
Administered Exchange 2010, DNS, DHCP, and performed detailed RCA for system issues.
Managed network configurations, including multiple NICs, static routes, and firewall requests.

Education

Diploma in Electronics And Communication -

Panimalar Polytechnic College

Chennai, India

04.2001 -

Skills

Identity Management: EntraID, Active Directory, Strong authentication,Life Cycle management

Scripting & Automation: PowerShell, KQL, Microsoft Graph API

Authentication Protocols: Kerberos, SAML, OAuth, OpenID Connect

Infrastructure Management: Windows Server, DNS, DHCP, Group Policy, PKI, IIS, NPS

Migration Expertise: Domain & Datacenter Migrations, Azure AD Connect, Conditional Forwarders, SYSVOL Migration

Security & Compliance: Conditional Access, PIM, Access Reviews, Certificate Management