Senior Network System Engineer

Job Title: Senior Network Engineer

Location: Nationwide / Hybrid (Ireland)

Contract Type: Daily Rate Contract - Long term rolling contract

Overview

The Senior Network Engineer will provide advanced technical expertise in the design, implementation, and support of a large‑scale enterprise network environment. The role supports a mission‑critical nationwide estate across WAN, LAN, and Wi‑Fi, with a strong focus on resilience, security, compliance, and future‑ready network architecture.

Key Responsibilities

• Design, implement, and support enterprise WAN, LAN, and Wi‑Fi connectivity across 189 nationwide sites supporting 7,000+ users.
• Diagnose and resolve network incidents, outages, and performance issues, including root‑cause analysis and corrective actions.
• Produce monthly incident and problem‑management reports and regular performance summaries.
• Monitor network health, capacity, and performance using enterprise monitoring tools.
• Design and deliver network upgrades, configuration changes, and infrastructure improvements.
• Install, test, validate, and document network equipment and services.
• Contribute to network architecture standards, reference designs, and patterns.
• Implement and manage network security controls, including TACACS+, RADIUS, ACLs, segmentation, and 802.1X.
• Deliver and review secure network access controls and compliance configurations.
• Support SD‑WAN, SASE, and Zero Trust initiatives from design through operational readiness.
• Support NIS2 and ISO 27001 compliance, including documentation, evidence gathering, and audit preparation.
• Maintain accurate documentation for DHCP, DNS, IP addressing, topology, and configurations.
• Develop, maintain, and improve operational procedures and runbooks.
• Deliver automation initiatives to improve efficiency, reliability, and operational consistency.
• Perform quarterly network optimisation and performance reviews.
• Provide technical leadership, mentoring, and escalation support to junior engineers.
• Deliver internal training, contribute to knowledge‑base articles, and produce troubleshooting guides.
• Research emerging networking technologies and provide technical recommendations and reports.
• Participate in cross‑functional projects, delivering secure and scalable network solutions.
• Provide regular stakeholder updates on network status, risks, and improvement opportunities.

Skills and Experience

• Very strong, proven experience in supporting large‑scale enterprise networks (10 + years)
• Strong expertise across WAN, LAN, Wi‑Fi, and network security technologies.
• Experience implementing and supporting SD‑WAN and modern network architectures.
• Solid exposure to Zero Trust and SASE concepts.
• Experience supporting NIS2 and ISO 27001 compliance requirements.
• Strong troubleshooting, documentation, and reporting skills.
• Experience with network monitoring, automation, and operational tooling.
• Ability to mentor junior engineers and contribute at both operational and architectural levels.

PFH is a premier provider of end-to-end ICT solutions and a managed services portfolio scaling from SMEs to large Enterprise organisations. We have unrivalled vendor relationships. We can procure, design, deploy and support all your ICT needs. Our ISO 20000/27001 24*7 certified Custodian™ Cloud Services and Custodian™ Managed Services provide the technology and expertise to mitigate risk and reduce your costs immediately. We have a nationwide network of over 450 dedicated professionals, including over 350 qualified engineers, ready to meet your ICT needs, with offices in Dublin, Cork and Galway.