Network Administrator - Juniper

Tata Consultancy Services Limited; Thane, Mumbai; On-site; INR 1,500,000 - 3,500,000; Full time

Job summary

Tata Consultancy Services Limited in Thane is seeking an experienced Network L3 Administrator focused on Juniper-based infrastructure. You will provide advanced troubleshooting, configuration, and incident resolution to sustain high availability and secure networking across LAN/WAN environments.

The role requires 5–10 years in network operations with deep Juniper experience, including Junos CLI, firewall rules, VPN, and routine firmware updates.

Qualifications

• 5-10 years experience in network operations.
• Minimum 5-10 years hands-on with Juniper environment.
• Experience in data center / enterprise / BFSI environment preferred.

Responsibilities

• Manage Juniper devices MX/EX/QFX/SRX and perform config/maintenance.
• Handle L3 incidents with root-cause analysis and RCA reports.
• Ensure SLA-compliant incident resolution and security controls.

Skills

TCP/IP

OSPF

BGP

Juniper OS

Junos CLI

VPN

Firewall

Monitoring tools

SLA adherence

Tools

SolarWinds

Nagios

PRTG

Wireshark

Job description

Job Description: Network L3 Admin Juniper (Certified)

1. Role Overview

• Provide L3 network support for Juniper-based infrastructure (LAN/WAN/Firewall)
• Handle advanced troubleshooting, configuration, and incident resolution
• Ensure high availability, performance, and security of network environment

2. Key Responsibilities

A. Network Operations & Support

• Manage and support Juniper devices (MX, EX, QFX, SRX series)
• Perform configuration, monitoring, and maintenance of routers/switches/firewalls
• Handle L2 incidents, service requests, and problem tickets
• Work with L1 for escalation and coordinate with L3 for complex issues [linkedin.com]

B. Troubleshooting & Incident Management

• Perform advanced troubleshooting of network issues (routing, switching, firewall, VPN)
• Conduct root cause analysis (RCA) and implement corrective actions
• Ensure incident resolution within SLA timelines

C. Configuration & Change Management

• Implement network configuration changes (VLAN, routing, subnetting, ACLs)
• Execute standard changes as per CAB / SOP
• Participate in firmware upgrades, patching, and DR drills

D. Monitoring & Performance Optimization

• Monitor network using tools like SolarWinds, Nagios, PRTG
• Analyze performance metrics and optimize network throughput
• Maintain uptime and network health

E. Security & Compliance

• Configure and manage firewall policies (Juniper SRX)
• Ensure security through VPN, ACLs, and filtering rules
• Monitor and respond to network security events

F. Documentation & Reporting

• Maintain:
  • Network diagrams
  • Configuration backups
  • SOPs / Knowledge base
• Provide incident reports, RCA, and audit compliance documentation

3. Technical Skills Required

Core Networking

• Strong knowledge of:
  • TCP/IP, OSI model, DNS, DHCP
  • Routing protocols (OSPF, BGP, Static)
  • Switching (VLAN, STP, trunking)

Juniper Technologies

• Hands-on experience with:
  • Junos OS
  • Juniper product families:
    • MX (Routing)
    • EX/QFX (Switching)
    • SRX (Firewall)
  • Knowledge of Junos CLI and troubleshooting commands

Network Security

• Firewall configuration (SRX/Palo Alto optional)
• VPN (IPSec/SSL)
• Basic IDS/IPS concepts

Tools & Monitoring

• Network monitoring tools (SolarWinds/Nagios/PRTG)
• Packet analysis (Wireshark optional)

4. Certifications (Preferred / Mandatory)

• JNCIA / JNCIS (Juniper Certifications)
• ITIL Foundation (good to have)
• Comparable Cisco certification (CCNA) - added advantage

5. Experience

• 5-10 years experience in network operations
• Minimum 5-10 years hands-on with Juniper environment
• Experience in data center / enterprise / BFSI environment preferred

6. Soft Skills

• Strong analytical & troubleshooting skills
• Good communication and stakeholder management
• Ability to work in 24x7 support model
• Documentation and process adherence mindset

7. KPIs / Performance Metrics

• Incident resolution within SLA (MTTR)
• Network uptime and availability %
• Change success rate
• Reduction in repeat incidents
• Compliance & audit readiness