Pullabhatla Kameswara Sarma

System & Infrastructure Administrator with 8+ years of experience across Telecom, IT Consulting, Financial Services, and Power Transmission (OT/IT Infrastructure) domains. Expert in managing complex hybrid data centers, core infrastructure services (Active Directory, DNS, DHCP, GPO), cloud identity (Entra ID, O365, Exchange Online), and enterprise virtualization platforms (VMware vSphere/vCenter, Hyper-V). Proven international onsite project execution experience, high-availability system maintenance, and OT/IT Power SCADA infrastructure operations.

Recognized with formal client appreciation awards for operational excellence in high-stakes enterprise environments.

Windows System Administrator at Diyar United Company India Pvt Ltd (2021-10 – Present)

(Domain: IT Consulting / Managed Services Provider | Environment: Windows Server 2008 R2–2025, VMware ESXi 6.5/7.0/8.0, Hyper-V, Entra ID, O365)

• International Onsite Project Experience (Client: Qatar Investment Authority - QIA, Qatar):
• Deployed onsite as a key technical resource for the Office 365 (O365) Support & Infrastructure Project for Qatar Investment Authority (QIA) in Qatar.
• Delivered end-to-end administration, mail migration support, user/mailbox mapping, tenant management, and high-priority resolution for O365 and hybrid Exchange environments.
• Core Managed Services Project (Client: OOREDOO Kuwait):
• Handled enterprise-level administration for Active Directory, DNS, DHCP, GPO, FSRM, and LAPS across massive multi-site domains using ManageEngine AD Manager Plus.
• Executed comprehensive Server Upgrades and Datacenter Virtualization tasks on VMware vSphere 6.5/7.0/8.0 and Microsoft Hyper-V environments managing over 1,000+ VMs and physical servers.
• Configured and managed VMware clusters, High Availability (HA), DRS, vMotion, host storage, templates, snapshots, and Cisco UCS Blade Servers.
• Monitored and mitigated infrastructure alerts via vRealize Operations Manager (vROPS); performed weekly/monthly CPU, Memory, Disk, and Storage health checks to ensure strict SLA compliance.
• Managed Cloud Identity & Access across Azure Entra ID Infrastructure and Exchange Online.
• Managed enterprise security and vulnerability patching utilizing Qualys Patch Management and ManageEngine, preventing system exposure and maintaining compliance with Cyber Security Standards.
• Served as Single Point of Contact (SPOC) for Infrastructure Optimization and lifecycle management from server commissioning to decommissioning.
• Authored standard operating procedures (SOPs) for server infrastructure operations across 1000+ nodes.

Sr. Network Administrator at W3Global India Pvt Ltd (2021-06 – 2021-10)

(Domain: US IT Staffing & Products | Environment: Windows Server 2012 R2/2016, Sophos XG230, Ubiquiti)

• Managed core IT infrastructure, network operations, and a team of 4 network engineers.
• Configured and administered Sophos XG230 Firewalls, site-to-site L2TP/IPSec and SSL VPNs, NAT/PAT rules, and network security policies.
• Administered Active Directory, DNS, DHCP, GPO, and Ubiquiti Wireless Access Points / Controllers.
• Managed vendor relationships, IT hardware procurement, infrastructure planning, and execution.

Network & System Administrator at Techolution India Pvt Ltd (2019-09 – 2021-05)

(Domain: Cloud Transformation | Environment: VMware NSX-T, KVM, SonicWALL TZ 600, macOS, Ubuntu)

• Administered Windows Server environments (AD, DNS, DHCP), macOS, Ubuntu Linux, and virtualized workloads on VMware NSX-T and KVM.
• Configured SonicWALL TZ 600 Firewalls, IPsec/SSL VPN tunnels, access control lists, and Ubiquiti Wi-Fi networks.
• Supported cross-functional engineering teams in an agile environment using JIRA and Slack.

Support Engineer (Payroll: Team Lease Services) at GE T&D India Ltd (2018-05 – 2019-09)

(Project: WRULDC | Domain: Power Transmission & Distribution / OT & IT Infrastructure)

• OT/IT SCADA Infrastructure Management: Handled operational technology (OT) and IT server/network infrastructure supporting mission-critical Power SCADA / EMS / NMS systems for WRULDC.
• Server & Virtualization Hardware: Managed IBM Rack Servers (M3250, 3530), IMM hardware interfaces, RAID array creation/maintenance, hardware heartbeat links, and bare-metal VMware ESXi / Hyper-V hypervisors.
• Network & Security Configuration: Configured Cisco switches (3950, 3750), routers (3900), and WatchGuard / FortiGate firewalls using OSPF, RIP, SNMP, VLANs, ACLs, and High Availability setups.
• Specialized OT Hardware & Storage: Administered SAN/NAS storage, IBM Tape Libraries, MASIBUS GPS Clocks (time synchronization), frequency/time terminal displays, and firmware lifecycle management.
• System Backup & Management: Executed backup/restore routines via Acronis, Norton Ghost, and Microsoft System Center Data Protection Manager (DPM), SCOM, and SCCM.

Sr. System Administrator at Sneha MACS Ltd (2014-06 – 2018-03)

(Domain: Micro Financial Services)

• Managed end-to-end IT infrastructure, active directory policies, domain services, Windows/Linux desktops, network availability, and core financial support systems.

SCADA Engineer (Payroll: Team Lease Services) at Alstom T&D India Ltd (2013-10 – 2014-05)

(Project: SRLDC | Domain: Power Transmission & Distribution / OT & IT Infrastructure)

• OT/IT SCADA Infrastructure Management: Maintained high-availability server, storage, and network infrastructure powering Power SCADA / EMS / NMS applications for SRLDC.
• Provisioned IBM rack servers, VMware ESXi hypervisors, RAID configurations, Checkpoint Security Appliances (4400-GAIA R75), and Cisco Catalyst switches.
• Managed time-synchronization systems including MASIBUS GPS Clocks, terminal server feeds, and backup systems via Microsoft DPM / SCOM / SCCM.

Network Executive at Blue Frog Mobile Technologies Pvt. Ltd (2012-01 – 2012-10)

System Administrator at VC HR Consultants Pvt. Ltd (2010-09 – 2011-06)

System Administrator at E-Technologies Pvt. Ltd (2007-04 – 2010-05)

Master of Science (M.Sc.) in Information Technology – Annamalai University (2019 – 2021)

Bachelor of Science (B.Sc.) in Information Technology – Alagappa University (2009 – 2011)

Diploma in Electronics & Communication Engineering (ECE) – TP Polytechnic (2004 – 2007)