Ajay Mahajan
Mumbai
Summary
Results-oriented Senior Infrastructure Engineer with 10+ years of experience in designing, deploying, and managing Windows Server, Azure, AWS, and Microsoft 365 solutions. Proven track record in leading global teams, delivering complex projects on time and within budget, and enhancing security and efficiency through innovative cloud and infrastructure strategies. Expertise in cloud computing, cybersecurity, networking, and identity and access management.
Overview
9
9
years of professional experience
Work History
Senior Infrastructure Lead
KAL ATM Software
01.2023 - Current
- Lead a global infrastructure team in designing, deploying, and managing Windows Server environments across on-premises and Azure Cloud platforms, achieving a 15% improvement in server uptime
- Designed and deployed secure Windows Server environments, adhering to industry best practices, resulting in a 20% increase in operational efficiency
- Managed critical infrastructure components, including Active Directory, DHCP, DNS, and Group Policy, ensuring seamless integration and operational efficiency
- Configured and maintained Cisco network devices, supporting stable and scalable network operations
- Managed Microsoft 365 suite for 1,000+ users, implementing advanced functionalities like Intune for device management and EntraID for secure access, leading to a 20% reduction in security incidents
- Enhanced information security posture using Microsoft Defender for Endpoint and advanced threat management tools
- Automated routine tasks using PowerShell scripting, increasing efficiency by 30%.
Windows Network Support Engineer
Microsoft
04.2022 - 12.2022
- Resolved complex issues for enterprise Premier level customers in the EMEA region, improving client satisfaction scores by 20%
- Provided subject matter expertise in DNS, DHCP, TCP/IP, and firewall management
- Supported a range of technologies, including DFSN, RADIUS, and Hyper-V, leading to quicker resolution times.
Senior IT Systems Engineer
KAL ATM Software
09.2015 - 04.2022
- Managed on-premises and cloud infrastructure, ensuring high availability and compliance with industry standards
- Implemented new IT solutions, leading to a 20% reduction in operational costs
- Provided technical support and resolved complex IT issues, maintaining a 98% resolution rate.
Education
B.Sc. IT -
Ravenshaw University
Cuttack05.2013
Skills
- Windows Server (2012, 2016, 2019, 2022)
- Linux (Red Hat, CentOS)
- Cisco
- Routing and Switching
- DHCP
- DNS
- Microsoft Defender for Endpoint
- Azure Sentinel
- EntraID (Azure AD)
- Conditional Access
- DLP
- AIP
- PowerShell
- Bash
- SCCM
- Intune
- EMS
- OPManager
- LogRhythm
- SCOM
- IT Security Management
- Incident Management
- Configuration Management
- Virtualization Technologies
- Disaster Recovery Planning
- Stakeholder Communication
- Technical architecture
Certifications and Courses
ISC2: Certified in Cybersecurity, 1636395, 09/01/23, 09/30/26
- Microsoft Certified: Identity and Access Administrator Associate, 89RA56-B85C14, 08/01/23, 08/31/25
- Microsoft 365 Certified: Modern Desktop Administrator Associate, H651-0255, 01/01/21, 01/31/25
- Microsoft 365 Certified: Security Administrator Associate, I744-1719, 05/01/23, 05/31/25
- Microsoft Certified: Azure Administrator Associate, I482-8356, 11/01/22, 11/30/25
- Microsoft 365 Certified: Enterprise Administrator Expert, H901-3147, 07/01/21, 07/31/25
- Microsoft Certified: Security, Identity, and Compliance Fundamentals, I123-5394, Never Expires
- Microsoft Azure Certified: Azure Fundamentals, I140-5586, Never Expires
- Amazon Web Services Solution Architect Course, 06/01/19, 09/30/19
- CCNA, 03/01/13, 03/31/16
Timeline
Senior Infrastructure Lead
KAL ATM Software
01.2023 - Current
Windows Network Support Engineer
Microsoft
04.2022 - 12.2022
Senior IT Systems Engineer
KAL ATM Software
09.2015 - 04.2022
B.Sc. IT -
Ravenshaw University
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