Senior Network Administrator

Unisys Infosolutions; Karnal; On-site; INR 800,000 - 1,400,000; Full time

Job summary

Unisys Infosolutions in Karnal, Haryana, is seeking an experienced Network & Systems Administrator to manage servers, network, data center, DNS, SSL/TLS, SMSC, and office IT infrastructure across India and beyond.

The ideal candidate will handle Windows/Linux server administration, firewall rules, VPN, routing, monitoring, backups, disaster recovery, and incident response with strong troubleshooting and documentation skills.

Qualifications

• Experience managing Windows and Linux servers in multi-location data centers.
• Strong knowledge of DNS/domain management, SSL/TLS, and VPN.
• Hands-on troubleshooting across servers, networks, and security.
• Ability to coordinate with ISPs, data centers, and vendors.

Responsibilities

• Server Administration: install/configure/patch/monitor Windows and Linux servers.
• Network & Data Center Management: manage IPs, routing, DNS, VPN, switches, gateways.
• Domain, DNS & Traffic Routing: manage DNS records, domain configurations, load balancing.
• SSL/TLS Certificate Management: procure, install, renew certificates and monitor expiry.
• Firewall & Infrastructure Security: configure policies, NAT, VPN rules, endpoint security.
• SMSC / SMPP Infrastructure: manage SMSC connectivity and routing.
• Backup & Disaster Recovery: ensure backups and DR procedures.
• Monitoring & Incident Management: proactive monitoring, incident response, documentation.
• Office IT Infrastructure: manage office network, LAN/Wi-Fi, printers.
• Access & Credential Management: RBAC, access revocation.
• Infrastructure Documentation: maintain up-to-date docs.

Skills

Windows Server Administration

Linux Administration

TCP/IP Networking

DNS & Domain Management

SSL/TLS & SNI

Routing & NAT

VPN

Firewall Management

Data Center Management

SMSC / SMPP

Backup & Disaster Recovery

Infrastructure Monitoring

Incident Management

Job description

Job Description

Position: Network & Systems Administrator

Department: IT / Infrastructure

Employment Type: Full-Time

Location: Karnal, Haryana

About the Role

We are looking for an experienced Network & Systems Administrator to manage and maintain our server, network, data center, security, domain, DNS, SSL, SMSC, and office IT infrastructure.

The ideal candidate should have strong hands-on experience in Windows & Linux server administration, networking, DNS/domain management, firewalls, SSL/TLS, VPN, routing, data center infrastructure, SMSC/SMPP, monitoring, and disaster recovery.

Key Responsibilities

1. Server Administration

• Manage and maintain Windows and Linux servers across data centers in India, the US, and other locations.
• Handle server installation, configuration, patching, upgrades, troubleshooting, and performance monitoring.
• Monitor CPU, RAM, disk usage, uptime, services, system health, and logs.
• Identify and resolve server and operating-system-related issues.

2. Network & Data Center Management

• Manage networking infrastructure including public/private IPs, routing, NAT, DNS, VPN, switches, routers, gateways, and connectivity.
• Coordinate with data centers, ISPs, hosting providers, and cloud partners for infrastructure-related issues.
• Troubleshoot network latency, packet loss, routing, connectivity, and port-related issues.
• Maintain network availability and infrastructure performance.

3. Domain, DNS & Traffic Routing

• Manage company domains, subdomains, DNS records, nameservers, and domain configurations.
• Configure and maintain A, CNAME, MX, TXT, SRV, and other DNS records.
• Manage domain-to-server/IP routing across multiple servers and data centers.
• Configure traffic routing, redirects, reverse proxies, load balancing, and failover routing where required.
• Maintain accurate mapping of domains, applications, servers, and IP addresses.

4. SSL/TLS Certificate Management

• Procure, install, configure, renew, and monitor SSL/TLS certificates.
• Manage wildcard, single-domain, and multi-domain certificates.
• Troubleshoot SSL handshake, certificate chain, SNI, protocol, cipher, and HTTPS-related issues.
• Maintain a certificate inventory and ensure timely renewals before expiry.

5. Firewall & Infrastructure Security

• Configure and maintain firewalls, security policies, port access, IP whitelisting/blacklisting, NAT, and VPN rules.
• Manage antivirus, endpoint protection, and operating-system security updates.
• Monitor unauthorized access attempts and infrastructure security incidents.
• Regularly review server exposure and security configurations.

6. SMSC / SMPP Infrastructure

• Manage and monitor SMSC servers and related infrastructure.
• Handle SMPP connectivity, SMS routing, IP/port configurations, throughput, and connectivity issues.
• Troubleshoot operator and aggregator connectivity.
• Coordinate with telecom operators and third-party telecom partners when required.

7. Software & System Maintenance

• Install, configure, upgrade, and maintain server-level software and services.
• Manage system services, scheduled jobs, dependencies, and application-supporting infrastructure.
• Perform preventive maintenance.
• Troubleshoot OS, software, service, and infrastructure issues.

8. Backup & Disaster Recovery

• Manage scheduled server, database/configuration, and infrastructure backups as applicable.
• Periodically verify backup integrity and restoration procedures.
• Maintain disaster recovery and infrastructure restoration procedures.
• Participate in recovery activities during infrastructure failures.

9. Office IT Infrastructure

• Manage office internet, LAN/Wi-Fi, firewalls, networking equipment, systems, printers, and related IT infrastructure.
• Manage primary and backup ISP connectivity where applicable.
• Troubleshoot employee system, network, internet, and connectivity issues.
• Support day-to-day office IT requirements.

10. Monitoring & Incident Management

• Proactively monitor critical servers, domains, SSL certificates, services, storage, network connectivity, and infrastructure availability.
• Respond to production and infrastructure incidents promptly.
• Investigate root causes and implement preventive measures.
• Coordinate with hosting providers, ISPs, data centers, telecom partners, and third-party vendors during incidents.
• Maintain incident and resolution records.

11. Access & Credential Management

• Manage server, VPN, firewall, domain, DNS, and infrastructure-level access.
• Implement appropriate role-based access controls.
• Ensure timely removal of access for former employees, vendors, and third parties.
• Maintain secure handling of administrative accounts and infrastructure credentials.

12. Infrastructure Documentation

• Maintain updated documentation covering:
• Servers and server inventory
• IP addresses
• Domains and DNS
• SSL certificates
• Firewall rules
• Network architecture
• Data centers
• SMSC/SMPP configurations
• Vendors and escalation contacts
• Maintain network diagrams and domain-to-server mapping.
• Ensure infrastructure documentation remains accurate and up to date.

Required / Preferred Skills

• Windows Server Administration
• Linux Administration
• TCP/IP Networking
• DNS & Domain Management
• SSL/TLS & SNI
• Routing & NAT
• VPN
• Firewall Management
• Reverse Proxy
• Load Balancing
• Server & Network Security
• Antivirus / Endpoint Security
• Data Center Management
• SMSC / SMPP
• Backup & Disaster Recovery
• Infrastructure Monitoring
• Office IT Support
• Troubleshooting & Incident Management
• Vendor / ISP / Data Center Coordination

Ideal Candidate

• Strong hands-on experience managing servers, networks, domains, DNS, SSL, firewalls, and data center infrastructure.
• Comfortable handling production infrastructure and critical incidents.
• Strong troubleshooting and problem-solving skills.
• Ability to work independently and take ownership of infrastructure operations.
• Good documentation and communication skills.
• Willingness to coordinate with internal teams and external infrastructure, hosting, ISP, and telecom vendors.

Key Performance Areas

• Infrastructure uptime and availability
• Incident response and resolution time
• Server and network performance
• Security and access management
• SSL/DNS/domain continuity
• Backup and disaster recovery readiness
• Infrastructure documentation accuracy
• Vendor and service-provider coordination