Senior Network Engineer – L3

Job Title:
Senior Network Engineer – L3 (TPG-T Customer Support)

Department
Network Operations / Core Network Engineering / Service Assurance
(Part of Technology Operations division in a Telecom or Managed Network Services organization)
Job Purpose
The Senior Network Engineer (L3) is responsible for providing advanced technical support, configuration management, troubleshooting, and network operations for the TPG-T customer environment. The role ensures high network performance, service reliability, and compliance with operational SLAs through proactive fault management and end-to-end problem resolution.

Key Responsibilities

• Network Operations & Support
• Perform L3-level troubleshooting for complex network issues impacting customer services.
• Handle fault and change management, including analysis, RCA (Root Cause Analysis), and resolution.
• Ensure end-to-end service availability across data, voice, and transport networks.
• Manage outage situations, coordinate with internal and external stakeholders for restoration.
• Provide technical escalation support for Level 1 and Level 2 teams.
• Configuration & Maintenance
• Manage configuration, deployment, and optimization of network devices (routers, switches, firewalls, load balancers).
• Perform software upgrades, patch management, and ensure compliance with network standards.
• Develop and maintain network documentation and design records.
• Network Design & Implementation
• Participate in network solution design, implementation, and integration of new technologies.
• Support MPLS, BGP, OSPF, EIGRP, and Layer 2/Layer 3 switching environments.
• Implement network security measures including VPNs, firewalls, and access control systems.
• Performance & Automation
• Utilize tools such as Wireshark, Netcool, Junos Space, and HP OpenView for monitoring and performance management.
• Perform capacity planning and recommend network improvements.
• Develop and maintain automation scripts using Python or Ansible to streamline operations.
• Coordination & Stakeholder Management
• Liaise with Technology Operations, Service Managers, Vendors, and Project Teams for technical delivery.
• Manage vendor escalations with Cisco, Juniper, F5, or other OEMs.
• Participate in post-incident reviews and contribute to service improvement plans.

Technical Skills Required

• Deep knowledge of Routing & Switching protocols: MPLS, BGP, OSPF, EIGRP, STP, RIP, TCP/IP.
• Expertise in network devices and OS: Cisco IOS, Juniper JUNOS, F5 Load Balancers, Cisco Wireless.
• Good understanding of security technologies: Firewalls, VPNs, IDS/IPS.
• Familiar with network analysis and diagnostic tools: Wireshark, MRTG, Cacti, Netcool, HP NNM.
• Intermediate knowledge of Unix Shell scripting and network automation (Python/Ansible).
• Understanding of internet protocols and services: IMAP, POP, SMTP, HTTP, LDAP, XML.

Soft Skills / Attributes

• Excellent analytical and troubleshooting abilities.
• Strong customer focus and communication skills.
• Capable of working under pressure in 24x7 operational environments.
• Leadership and coordination skills for incident and problem management.
• Highly organized, process-driven, and detail-oriented.

Experience & Qualifications

• Experience: Minimum 7+ years in Network Engineering / Operations roles.

• Certifications (Preferred):

• Cisco: CCNP / CCIP / CCSP / CCDP / CCIE

• Juniper: JNCIP

• Security: CCSA / CCSE (desirable)

• Education: Bachelor's degree in Electronics, Telecommunications, or Computer Science.

Interfaces

• Internal:

• TPG-T Technology Operations

• Service Delivery & Project Teams

• Network Managers and Problem Leads

• External:

• Third-party vendors (IBM, HP, Kordia, Unisys, etc.)

• Customer stakeholders and OEM technical support

Skills: wireshark,firewalls,routing and switching protocols,management,netcool,design,telecommunication protocols,multi router traffic grapher (mrtg),operations