Senior Network Engineer

PFH Technology Group; Limerick; On-site; EUR 80,000 - 120,000; Full time

Job summary

PFH Technology Group is seeking an experienced Level 3 Network Operations Engineer to join our Network Operations team in Ireland. The role focuses on supporting, maintaining, and troubleshooting large-scale ISP, carrier, and enterprise networks for high availability and reliability.

The ideal candidate will have strong experience with Cisco IOS/IOS-XE, Juniper Junos, Linux systems, Kubernetes, network automation, and operational support in complex service provider environments.

Qualifications

• Experience supporting large-scale ISP, carrier, or enterprise networks.
• Hands-on with Cisco IOS/IOS-XE, Juniper Junos, and multi-vendor infrastructure.
• Experience with carrier Ethernet tech including VLAN, QinQ, LACP, STP and Ethernet transport.
• Strong routing protocol knowledge: BGP, OSPF, MPLS, HSRP/VRRP.
• Proficient in Linux administration (RHEL/CentOS/Ubuntu) in production.
• Familiarity with Kubernetes environments and container troubleshooting.
• Knowledge of SNMP, Syslog, telemetry, and network monitoring tools.

Responsibilities

• Provide Level 2 and Level 3 operational support across large-scale networks.
• Troubleshoot routing, switching issues across multi-vendor platforms.
• Support Layer 2/3 technologies including VLANs, OSPF, BGP, and MPLS.
• Investigate incidents, degradations, and outages within SLAs.
• Perform network analysis with packet captures, SNMP, and telemetry.
• Coordinate changes and deployments through change management processes.
• Collaborate with Core, Access, Optical, Enterprise, and Vendor teams.

Skills

Large-scale networks

Cisco IOS

Juniper Junos

Linux administration

Kubernetes

Network automation

Packet analysis

BGP

OSPF

MPLS

Tools

Cacti

Oxidized

Job description

PFH Technology is seeking an experienced Level 3 Network Operations Engineer to join our Network Operations team. The successful candidate will be responsible for supporting, maintaining, and troubleshooting large-scale ISP, carrier, and enterprise network environments, ensuring high availability, performance, and service reliability across critical network infrastructure

.This role is ideal for a highly skilled network professional with strong experience across multi-vendor networking platforms, carrier technologies, Linux systems, Kubernetes, network automation, and operational support within complex service provider environments

Key Responsibilities

• Provide Level 2 and Level 3 operational support across large-scale ISP, carrier, and enterprise network environment
• Troubleshoot and resolve complex routing and switching issues across multi-vendor platforms including Cisco IOS/IOS-XE, Juniper Junos, and Ciena SAO
• Support, maintain, and troubleshoot Layer 2 technologies including VLANs, QinQ, LACP, STP, LLDP, and Ethernet transport service
• Support and troubleshoot Layer 3 technologies including OSPF, BGP, HSRP, VRRP, MPLS, and IP service
• Investigate, diagnose, and resolve customer-impacting incidents, service degradations, and major outages within agreed service level
• Perform network analysis and fault investigation using packet captures, SNMP monitoring, syslogs, telemetry, and network diagnostic tool
• Execute planned network changes, upgrades, maintenance activities, and infrastructure deployments through formal change management processe
• Collaborate with Core, Access, Optical, Enterprise, and Vendor teams to diagnose and resolve complex infrastructure issue
• Support broadband infrastructure platforms including Broadband Network Gateways (BNG), AAA services, and subscriber management environment
• Administer and troubleshoot Linux-based systems and network management platform
• Support and maintain Kubernetes (K8s) environments, including troubleshooting pods, containers, services, and cluster-related issue
• Monitor network health, performance, capacity, and availability using operational monitoring platforms and management tool
• Administer and support network monitoring platforms such as Cacti, Oxidized, and other operational toolin
• Perform Root Cause Analysis (RCA) following major incidents and produce detailed incident and problem report
• Liaise with vendors including Cisco, Juniper, Nokia, Ciena, and third-party suppliers during escalations, fault investigations, and service restoration activitie

Required Skills & Experie

• Proven experience supporting large-scale ISP, carrier, or enterprise network environmen
• Strong hands-on experience with Cisco IOS/IOS-XE, Juniper Junos, and multi-vendor network infrastructu
• Experience supporting carrier Ethernet technologies including VLAN, QinQ, LACP, STP, LLDP, and Ethernet transport servic
• Strong knowledge of routing protocols including BGP, OSPF, MPLS, HSRP, VRRP, and IP networking concep
• Experience troubleshooting complex routing, switching, and service provider network issu
• es.Hands-on experience with Linux administration (RHEL, CentOS, Ubuntu) in production environmen
• Experience supporting Kubernetes (K8s) environments, including container and service troubleshooti
• Experience working with Broadband Network Gateways (BNG), AAA platforms, and subscriber management systems is highly desirab
• Strong understanding of network monitoring and management technologies including SNMP, Syslog, telemetry, packet analysis, and performance monitoring too
• Experience with monitoring platforms such as Cacti, Oxidized, or equivalent network management solutio
• Knowledge of network automation and scripting using Python or similar languag
• Experience performing packet analysis using tools such as Wireshark or tcpdu
• Familiarity with ITIL processes, incident management, problem management, and formal change management procedur
• Ability to work effectively in high-pressure operational environments and participate in on-call support rotatio