Job Description

Job Title – Senior System Administrator

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Location: Madurai

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Experience: 3-5 years

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Role Overview

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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.

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Key Responsibilities

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- Infrastructure & Cloud Management
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- Manage and monitor servers, storage, and networks across on-premises and cloud (Azure / O365 / other cloud environments).
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- Administer Office 365 services including Exchange Online, SharePoint, Teams, OneDrive, and licensing.
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- Perform user migration and mailbox management between tenants and environments.
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- Security & Access Control
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- Configure and maintain firewall policies, VPNs, and VLANs for secure and optimized access.
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- Implement and monitor endpoint security (antivirus, DLP, EDR/XDR) across the organization.
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- Manage Active Directory (AD), Azure AD, and Group Policy Objects (GPOs) for access control, security compliance, and user provisioning.
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- Network & System Administration
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- Configure and manage LAN, WAN, VLANs, and VPN connections for seamless connectivity.
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- Troubleshoot networking issues, internet downtime, login failures, and folder access issues.
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- Ensure high availability and performance of file servers, application servers, and database servers.
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- Endpoint & Work from home Support
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- Oversee endpoint management using MDM/Endpoint Central/Intune for patching, updates, and compliance.
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- Provide technical support for end-users including remote workers (login, access,



VPN, printers, system issues).
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- Maintain IT asset lifecycle including allocation, upgrades, and decommissioning.
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- Backup & Disaster Recovery
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- Manage backup schedules (full, incremental, differential) and validate recovery procedures.
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- Ensure business continuity through tested disaster recovery plans.
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- Documentation & Compliance
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- Maintain detailed documentation of infrastructure, policies, incidents, and resolutions.
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- Support internal audits and compliance frameworks (SOC, ISO, GDPR).
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What We Expect

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