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Senior System Administrator

Remote / Online - Candidates ideally in
600001, Chennai, Tamil Nadu, India
Listing for: OptiSol Business Solutions
Remote/Work from Home position
Listed on 2026-09-29
Job specializations:
  • IT/Tech
    Systems Administrator, Cybersecurity, IT Support, Disaster Recovery IT
Job Description & How to Apply Below
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, One Drive, 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.
Position Requirements
10+ Years work experience
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