Sumit Kumar Mahajan — Senior Technical Architect

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About

Senior Technical Architect with 17+ years of experience architecting and delivering enterprise cloud and infrastructure solutions across Microsoft Azure, Microsoft 365, and AWS. Microsoft Certified Architect Expert with proven success leading large-scale migrations, security operations, and pre-sales solution design. Skilled in technical project management, stakeholder engagement, governance, and team leadership, consistently delivering secure, scalable, and cost-optimized solutions aligned to business objectives.

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Core Competencies

Cloud Solution Architecture (Azure, Microsoft 365, AWS)
Landing Zone & Virtual WAN Design
Pre-Sales Solutioning
Statements of Work
Client Workshops
Solution Costing & Scoping
Technical Project Management
Migration Planning
Cutover & Risk Management
Delivery Governance
Security Operations (SOC)
Microsoft Sentinel
Defender XDR
Zero Trust
Identity & Access (Entra ID)
Identity Migration (Okta to Entra ID)
Active Directory
Exchange Online
Tenant-to-Tenant
Endpoint Management (Intune)
Team Leadership
Mentoring
Stakeholder Management
Infrastructure as Code & Automation

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Technical Skills

Cloud Platforms

Microsoft Azure
Amazon Web Services (AWS)
Microsoft 365

Security & Identity

Microsoft Sentinel
Microsoft Defender XDR
SOC Operations
Zero Trust
Entra ID
Okta
Active Directory

Infrastructure

Exchange Online
Teams Enterprise Voice
Azure NetApp
VMware
Hyper-V
Windows Server
Linux

Endpoint Management

Microsoft Intune
SCCM
Windows Autopilot
JAMF
VMware Workspace ONE

Automation & DevOps

Terraform
Bicep
PowerShell
Microsoft Graph API
GitHub
Azure DevOps
Docker
Kubernetes

Migration Tools

Quest On Demand
BitTitan MigrationWiz
Azure Migrate

Methodologies

Pre-Sales
Solution Design
Project Management
Governance
Cloud Adoption Framework

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Experience

Technical Architect

Nov 2019 – Present

Netwoven (Microsoft Solutions Partner) · Kolkata, India

Technical delivery lead within a global delivery model, leading small infrastructure teams across cloud, identity, security, and endpoint engagements for small-business to large-enterprise customers; own solution design, effort estimation, delivery quality, and client escalation.

Led a large-scale US healthcare Active Directory consolidation of 22,000 devices, unifying identity, Group Policy, and endpoint estates with zero business disruption.
Led SOC foundation and Microsoft 365 tenant security modernization programs, including Microsoft Sentinel deployment, Defender XDR onboarding, incident-response playbooks, and Zero Trust workshops.
Designed and delivered identity-platform migrations including Okta to Microsoft Entra ID, re-platforming single sign-on, Conditional Access, and user lifecycle workflows.
Architected Microsoft Intune device-management fleets (Windows Autopilot, compliance, and configuration baselines) scaled from small-business to large-enterprise customers.
Delivered end-to-end infrastructure migration services across Azure landing zones, VMware-to-Azure (200 servers), Active Directory, Exchange, and file/storage workloads.
Designed and implemented enterprise Azure landing zones with Virtual WAN across two cross-region hubs, Azure Firewall, and site-to-site VPN, applying security and governance best practices.
Managed tenant-to-tenant migration of 50,000 mailboxes using Quest On Demand Migration with zero business disruption for a US healthcare enterprise.
Executed zero-downtime Active Directory upgrade (2012 R2 to 2022) and 500 GB file-server migration to Azure NetApp, including FRS-to-DFSR and FSMO role transitions.
Migrated SCCM infrastructure to Azure IaaS and implemented co-management CMG gateway for internet-facing device connectivity.
Automated eDiscovery export of 33 TB of PST data via PowerShell, with SharePoint Online reporting and Power BI burndown dashboards.
Led transition from Skype for Business Server to Microsoft Teams with Direct Routing and SBC integration.
Drove pre-sales engagements, defining project scope and statements of work to improve client alignment and win rates.
Mentored engineers, supported technical recruitment, and contributed technical blogs and customer success stories.

Manager – Messaging Infrastructure

Jul 2019 – Oct 2019

Genpact India · Hyderabad, India

Led strategic planning and governance of Microsoft 365 implementations, improving efficiency and security.
Oversaw migration and deployment of Microsoft Exchange environments with enhanced email security and compliance.

Senior Technical Lead

Mar 2019 – Jun 2019

MSR IT Solution · Kolkata, India

Led a global service desk using ITSM tooling and delivered Level 2 support for Microsoft 365 and Azure AD.

Engineer – Mail Management

Dec 2007 – Mar 2019

Wipro · Kolkata, India

Provided Level 3 managed-services support across India for Exchange Server, Lotus Domino, Trend Micro, Symantec email security, and Intune.

Technical Specialist – Messaging

Apr 2013 – May 2014

IBM India · Bangalore, India

Managed worldwide messaging support as part of the Global Delivery Team for Lotus Domino, Exchange Server, and BlackBerry.

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Key Projects

Azure Foundation

Built scalable landing-zone automation, Virtual WAN, and site-to-site VPN with Azure Firewall; migrated application servers via Azure Migrate.

Microsoft 365 Tenant-to-Tenant Migration

Delivered migrations using Quest, BitTitan, and custom PowerShell/Graph API inventory and discovery.

SOC & Defender Implementation

Deployed Sentinel workspace, configured XDR data connectors, and developed SOC program with incident-management playbook.

AD Domain Consolidation

Consolidated two AD forests using Quest, migrating 200 users and 20 application servers including SQL databases.

Endpoint Management

Implemented Windows Autopilot for custom configurations and delivered Intune workshops for multiple clients.

Microsoft 365 Copilot Adoption Workshop

Led Copilot readiness assessments and hands-on adoption workshops covering data governance, Microsoft Purview controls, licensing, and change management to drive a secure, high-value AI rollout across business units.

Enterprise Automation with Azure AI Foundry

Designed and built enterprise automation on Azure AI Foundry, orchestrating agentic, LLM-powered workflows integrated with Microsoft Graph and line-of-business systems to streamline operations and reduce manual effort.

Teams Enterprise Voice — Zoom to Teams Migration

Delivered end-to-end Microsoft Teams Enterprise Voice implementation and phone-number porting from Zoom Phone to Teams, including Auto Attendants, service lines, call queues, and toll/toll-free numbers, with Direct Routing and SBC integration for seamless enterprise telephony.

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Certifications

SC-100 Expert Microsoft Certified: Cybersecurity Architect Expert SC-100

AZ-500 Associate Microsoft Certified: Azure Security Engineer Associate AZ-500

SC-200 Associate Microsoft Certified: Security Operations Analyst Associate SC-200

SC-400 Associate Microsoft Certified: Information Protection and Compliance Administrator Associate SC-400

MS-500 Associate Microsoft 365 Certified: Security Administrator Associate MS-500

MS-700 Associate Microsoft 365 Certified: Teams Administrator Associate MS-700

AZ-800 Associate Microsoft Certified: Windows Server Hybrid Administrator Associate AZ-800 / AZ-801

SAA Associate AWS Certified Solutions Architect – Associate SAA

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Education

Bachelor of Science (Bio Science)

University of Calcutta, India

2003 – 2006

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Get in Touch

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