Senior System Administrator
4 days ago
The Senior System Administrator shall be responsible for ensuring the stability, security, compliance, and performance of the organization's IT infrastructure across on-premises and cloud environments. The following is the JD that defines the responsibilities, deliverables, and expectations for this role.
1. System Administration
- Manage, monitor, and maintain Windows Server (2016/2019/2022) and Linux (Ubuntu/CentOS) servers, both on-premises and cloud-hosted.
- Ensure high availability and performance of Active Directory, DNS, DHCP, Group Policy, file/print servers, and Exchange/SMTP services.
- Perform OS patching, upgrades, and preventive maintenance with documented change windows and minimal downtime.
- Automate administrative tasks using PowerShell, Bash, or equivalent scripting tools.
- Maintain accurate system documentation, SOPs, and change logs.
2. Network Administration
- Configure, secure, and maintain routers, switches, firewalls, VPNs, and load balancers (Cisco, Fortinet, pfSense, or equivalent).
- Monitor and optimize LAN/WAN performance, bandwidth utilization, and connectivity across multiple sites.
- Troubleshoot and resolve network outages, performance bottlenecks, and escalated incidents.
- Ensure redundancy, failover readiness, and proactive monitoring via Nagios, Zabbix, PRTG, or equivalent tools.
3. Security & Compliance
- Implement and manage endpoint security, antivirus, IDS/IPS, and multi-factor authentication.
- Enforce role-based access control (RBAC), least-privilege principles, and encryption policies.
- Conduct and support vulnerability assessments, remediation, and compliance audits (HIPAA, ISO, HITRUST).
- Maintain logs and records for incident response, security investigations, and compliance evidence.
4. Cloud & Virtualization
- Administer AWS, Azure, and/or OCI infrastructure, including compute (VMs/EC2), storage, networking, and IAM.
- Manage VMware, Hyper-V, or Proxmox virtualized environments, including resource allocation, patching, and lifecycle management.
- Configure and maintain backup, replication, snapshots, and disaster recovery plans.
- Execute and support infrastructure migrations, scaling, and cloud modernization projects.
5. Support & Incident Management
- Act as L3 escalation point for infrastructure and networking incidents.
- Provide hands-on support during deployments, migrations, upgrades, and cutovers.
- Ensure incident, problem, and change management practices are followed.
- Participate in on-call rotation and after-hours maintenance windows as required.
6. Tools & Platforms
The Employee shall be expected to demonstrate hands-on expertise with:
- Operating Systems: Windows Server 2016/2019/2022, Linux Ubuntu/CentOS.
- Core Services: Active Directory, DHCP, DNS, GPOs, Exchange/SMTP.
- Networking: TCP/IP, DNS, VLANs, VPN, firewalls, load balancers.
- Virtualization: VMware, Hyper-V, Proxmox.
- Cloud Platforms: AWS, Azure, OCI.
- Backup & DR: Veeam, Acronis, Bacula (or equivalent).
- Monitoring: Nagios, Zabbix, PRTG.
7. Documentation & Reporting
- Maintain infrastructure topology diagrams, asset inventories, and configuration baselines.
- Document standard operating procedures, incident reports, RCA (Root Cause Analysis) reports, and compliance logs.
- Provide monthly infrastructure health reports to management, highlighting risks, incidents, and improvements.
8. Professional Expectations
- Uphold confidentiality and data privacy policies at all times.
- Collaborate with cross-functional teams including DevOps, Security, and Application Support.
- Provide knowledge transfer, mentoring, and training to junior IT staff.
- Continuously update skills and pursue relevant certifications (e.g., Microsoft Azure, CCNA, Security+, RHCE, VCP).
- Maintain clear communication with management during incidents, planned outages, and projects.
9. Deliverables & KPIs
The Employee's performance will be evaluated on:
- System Uptime & Availability – maintaining agreed SLAs (e.g., ≥99.9%).
- Patch Compliance – timely application of critical patches across systems.
- Incident Resolution – response and closure within SLA timelines.
- Security Posture – zero critical vulnerabilities unaddressed beyond defined windows.
- Documentation Quality – updated, accurate, and auditable system/process documentation.
- Project Delivery – successful completion of assigned infrastructure projects within scope and timelines.
Experience - 7 to 9 Yrs
Location - Ahmedabad (Onsite)
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