Senior System Administrator

OptiSol Business Solutions; Madurai District; On-site; INR 600,000 - 1,000,000; Full time

Job summary

OptiSol Business Solutions is hiring a Senior System Administrator in Madurai to manage on‑premises and cloud IT infrastructure. The role emphasizes security, availability, and proactive monitoring with hands‑on administration of AD/Azure AD, O365, and endpoint management.

The ideal candidate will handle firewall/VPN configurations, disaster recovery planning, and cross‑platform administration across Windows, Linux, and macOS. On‑site work is required in Madurai.

Qualifications

• Strong knowledge of Windows, Linux, and macOS operating systems.
• Hands-on experience with O365 administration, cloud environments, and Active Directory.
• Proficiency in firewall configuration and network segmentation.

Responsibilities

• Manage and monitor servers, storage, and networks across on-premises and cloud environments.
• Administer Office 365 services including Exchange Online, SharePoint, Teams, OneDrive, and licensing.
• Configure and maintain firewall policies, VPNs, and VLANs for secure access.
• Implement and monitor endpoint security (antivirus, DLP, EDR/XDR) across the organization.
• Manage Active Directory, Azure AD, and GPOs for access control and provisioning.
• Troubleshoot networking issues and ensure high availability of servers and databases.
• Oversee endpoint management using MDM/Endpoint Central/Intune for patching and compliance.

Skills

Windows

Linux

macOS

O365 administration

Active Directory

Networking

Security

Documentation

Tools

Azure AD

Intune

Endpoint Central

MDM

Job description

Job Title – Senior System Administrator

Location: Madurai

Experience: 3-5 years

Role Overview

We are seeking an experienced System Administrator with strong expertise in enterprise IT infrastructure, cloud platforms, and endpoint management. This role requires hands‑on experience in managing on‑premises and cloud systems, ensuring security and availability, and supporting business continuity through proactive monitoring, configuration, and incident resolution.

Key Responsibilities

• Infrastructure & Cloud Management
• Manage and monitor servers, storage, and networks across on-premises and cloud (Azure / O365 / other cloud environments).
• Administer Office 365 services including Exchange Online, SharePoint, Teams, OneDrive, and licensing.
• Perform user migration and mailbox management between tenants and environments.
• Security & Access Control
• Configure and maintain firewall policies, VPNs, and VLANs for secure and optimized access.
• Implement and monitor endpoint security (antivirus, DLP, EDR/XDR) across the organization.
• Manage Active Directory (AD), Azure AD, and Group Policy Objects (GPOs) for access control, security compliance, and user provisioning.
• Network & System Administration
• Configure and manage LAN, WAN, VLANs, and VPN connections for seamless connectivity.
• Troubleshoot networking issues, internet downtime, login failures, and folder access issues.
• Ensure high availability and performance of file servers, application servers, and database servers.
• Endpoint & Remote Work Support
• Oversee endpoint management using MDM/Endpoint Central/Intune for patching, updates, and compliance.
• Provide technical support for end-users including remote workers (login, access, VPN, printers, system issues).
• Maintain IT asset lifecycle including allocation, upgrades, and decommissioning.
• Backup & Disaster Recovery
• Manage backup schedules (full, incremental, differential) and validate recovery procedures.
• Ensure business continuity through tested disaster recovery plans.
• Documentation & Compliance
• Maintain detailed documentation of infrastructure, policies, incidents, and resolutions.
• Support internal audits and compliance frameworks (SOC, ISO, GDPR).

What We Expect

• Technical Expertise
• Strong knowledge of Windows, Linux, and macOS operating systems.
• Hands‑on experience with O365 administration, cloud environments, and Active Directory.
• Proficiency in firewall configuration (policies, NAT, VPN) and network segmentation (VLANs).
• Experience in endpoint management (patching, antivirus, MDM, Intune/Endpoint Central).
• Knowledge of backup strategies, disaster recovery, and system migrations.
• Networking & Security
• Solid understanding of IP addressing, DNS, DHCP, and routing concepts.
• Ability to troubleshoot LAN/WAN/VPN/firewall issues.
• Knowledge of security best practices including patch management and monitoring.
• Problem‑Solving & Support
• Skilled in troubleshooting system errors, login failures, and access issues.
• Ability to handle user escalations with patience and clear communication.
• Proactive in identifying and resolving potential system bottlenecks or risks.
• Soft Skills & Growth
• Strong communication skills to explain technical concepts in simple terms.
• Ability to document processes, SOPs, and incident reports clearly.
• Willingness to learn new technologies and grow with evolving IT trends.