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TATHAGATA User

@tathagatauser

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IAM and cloud engineer securing Microsoft Azure, Microsoft 365, and Entra ID at enterprise scale.

India

Message

What I'm looking for

I’m looking to lead secure IAM and cloud identity programs on Microsoft stacks—building Zero Trust, resilient DR, and automated operations—while improving reliability, reducing incident noise, and enabling teams through clear runbooks and scalable governance.

I’m an Infrastructure and Identity Access Management (IAM) Engineer with 7 years of enterprise-scale experience designing and managing Microsoft Azure, Microsoft 365, and Active Directory ecosystems. I focus on orchestrating secure cloud deployments, automating operations with PowerShell, and implementing Zero Trust for global user bases exceeding 9,000.

I drive systemic reliability through disaster recovery planning, high availability, and identity governance—backed by a track record of 99.99% uptime. I’ve engineered SSO and Conditional Access frameworks for 50+ enterprise applications using SAML/OAuth, strengthening security postures while keeping operations resilient during failover tests.

I also modernize operational excellence by optimizing monitoring and runbooks, integrating observability/GenAI platforms (AI Force, AI Foundry, iObserve), and managing enterprise PKI lifecycle work (100+ critical certificate renewals). Whether at HCLTech, Sherweb India, or TCS, I’m known for reducing manual assessments, improving incident response, and enabling engineering teams through technical coaching and playbooks.

Experience

Work history, roles, and key accomplishments

Current

Technical Specialist

Current

HCLTech

Aug 2025 - Present (11 months)

Administers and enhances Active Directory and Microsoft Entra ID to scale enterprise IAM for 9,000+ employees. Leads DR/business continuity, designs SSO and Conditional Access for 50+ applications, and manages PKI lifecycle with 100+ certificate renewals.

Active Directory Microsoft Entra ID Azure AD Disaster Recovery Business Continuity SSO Conditional Access SAML OAuth Zero Trust Architecture PKI Certificate Management

M365 Azure Product Specialist

Sherweb

Jun 2022 - Aug 2025 (3 years 2 months)

Deployed Azure and Microsoft 365 solutions, administering large-scale compute and IAM environments (500+ virtual machines, 15 storage clusters) supporting 5,000 users with 99.99% availability. Resolved Tier 3 Azure identity/hybrid AD escalations, mentored 20+ engineering teams, and created operational playbooks and knowledge base assets to improve case resolution performance.

Microsoft Azure Microsoft 365 Virtualization Azure AD Technical Coaching And Operational Playbooks

System Engineer

Tata Consultancy Services

Aug 2019 - Jun 2022 (2 years 10 months)

Automated IAM and Microsoft 365 lifecycle processes using advanced PowerShell scripting, improving operational efficiency by 25%. Implemented Exchange Online Protection (EOP) policies (SPF/DKIM/DMARC), managed Microsoft 365 hybrid mail flow for 15 applications, and handled zero-downtime patching/upgrades for Exchange and ADFS to maintain 98% SLA compliance.