Senior Network Infrastructure Engineer (Cloud & Security)

EIR; Dublin; Hybrid; EUR 110,000 - 140,000; Full time

Job summary

eir Business is seeking a Senior Network Infrastructure Engineer - Cloud & Security to join a team delivering managed network services to a large Irish enterprise client. The role focuses on design, implementation, operation and ongoing support of enterprise networking and security in a hybrid environment, including Azure, with emphasis on Check Point and Cisco technologies.

The role supports high availability, security compliance and operational excellence, acting as a SME and engaging with

Qualifications

• Proven experience designing and operating networking and security in on-premise and Azure cloud infrastructure.

Responsibilities

• Act as a senior technical escalation point for complex network and security incidents, monitoring, troubleshooting, root cause analysis, and continuous improvement of cloud network and security services.
• Provide technical leadership for network and security infrastructure projects, ensuring solutions meet operational and architectural standards.
• Design, implement and support secure network and security solutions on-premises and Azure.
• Maintain and enhance security platform integrations and automation capabilities, including management of Check Point CloudGuard policies and configurations.
• Support Cisco networking and security technologies, including routing and switching, BGP, IPSec VPNs, Firepower and ACI, with proactive monitoring and capacity planning.
• Collaborate with infrastructure, cloud and security teams to deliver resilient cloud solutions and support security reviews and incident response activities.
• Perform planned changes, upgrades, patching and lifecycle management of network and security platforms.
• Prepare and deliver customer-facing security reports and technical briefings on firewall operations, threat activity, policy compliance, risk exposure and remediation guidance.

Skills

Networking design

Azure networking

Security architecture

Troubleshooting

Incident response

Cloud security

Stakeholder communication

Project leadership

Tools

Check Point CloudGuard

Terraform

Firepower FMC

Firepower Threat Defence

Job description

Closing Date: 04/12/2026

Location: HSQ2, Dublin 8 & Hybrid

Reference #: 2152

Business Area:

Dedicated Services

About This Role:

eir business is seeking a Senior NetworkInfrastructure Engineer - Cloud & Security) to join a team of network andsecurity infrastructure professionals delivering managed network services to alarge Irish enterprise client. The Senior Network & Security InfrastructureEngineer will be responsible for the design, implementation, operation, andongoing support of enterprise networking and security infrastructure within ahybrid environment, including Azure, with a strong focus on Check Point andCisco technologies.

The role supports business-critical services, ensuringhigh availability, security compliance, and operational excellence. You willact as an SME, engaging with engineers, management, and customer stakeholdersto define solution approaches, agree maintenance objectives, introduce newcapabilities, initiate technical improvements, and drive issue resolution.

This is a hands-on network and security infrastructureengineering role focused on solution design, project delivery and the managementand operation of critical infrastructure to a high standard. Strongtroubleshooting skills are essential.

eir Business is the B2B division of eir and one of Ireland's leading providers of telecommunications, technology, cloud, cybersecurity, managed IT and workplace solutions. Supporting organisations of all sizes, from SMEs to large enterprises and public sector bodies, eir Business delivers secure, end-to-end connectivity and digital transformation services that help customers operate more efficiently, securely and effectively. Leveraging Ireland's largest mobile network, extensive fixed-line infrastructure, cloud capabilities and 24/7 expert support, eir Business partners with customers to design, implement and manage technology solutions that enable innovation, productivity and business growth.

Expectations From TheRole:

Key Responsibilities:

• Act as a senior technical escalation pointfor complex network and security incidents, conducting monitoring,troubleshooting, root cause analysis, continuously improve cloud network andsecurity services resilience and cyber maturity.
• Provide technical leadership for networkand security infrastructure projects, ensuring solutions are delivered in linewith operational and architectural standards.
• Design, implement and support secure networkand security solutions on-premises and Azure.
• Maintain and enhance security platformintegrations and automation capabilities, including management of Check PointCloudGuard policies and configurations.
• Support Cisco networking and securitytechnologies, including routing and switching, BGP, IPSec VPNs, Firepower andACI, providing proactive monitoring, troubleshooting, capacity planning andservice improvement.
• Support and maintain automation of networkand security infrastructure deployments using Terraform andInfrastructure-as-Code (IaC) where appropriate.
• Collaborate with infrastructure, cloud andsecurity teams to deliver resilient and secure cloud solutions
• Support security reviews, incidentresponse activities and compliance requirements.
• Perform planned changes, upgrades,patching, and lifecycle management of network and security platforms.
• Manage infrastructure reliability,ensuring availability, performance, resilience, and compliance with agreedSLAs.
• Prepare and delivercustomer-facing security reports, technical briefings covering firewalloperations, threat activity, policy compliance, risk exposure, and remediationrecommendations.

Requirements For ASuccessful Application:

Experience:

• Proven experience designing and operating networkingand security in on-premise and Azure cloud infrastructure.
• Strong understanding of Azure networkingand security services, including ExpressRoute, VNets, NSGs, Azure Firewall,load balancing, network segmentation and integration with Check Point securitysolutions.
• Exposure to or experience with Terraform andautomation of network and security services would be advantageous.
• Experience managing Check Point CloudGuardor similar cloud security platforms. Experience with API-driven integrationsand automation would be beneficial.
• Strong experience with Cisco networkingand security technologies, including routing and switching, BGP, IPSec, packetcapture and advanced network troubleshooting.
• Experience supporting and managing Ciscophysical and virtual routers, Firepower Management Centre (FMC) and FirepowerThreat Defence (FTD) platforms.
• Knowledge of Cisco ACI, including routing,switching and L3Out connectivity.
• Experience with firewall management,monitoring, troubleshooting, capacity planning and performance optimisationacross enterprise environments.
• Expert-level troubleshooting anddiagnostic skills across routing, switching, firewalling and hybrid networkenvironments.
• Strong operational experience inlarge-scale enterprise and multi-site environments, with proven expertise insolution design, deployment, delivery and ongoing operational management.
• Excellent interpersonal skill including relationship development skills influencing,and communications skills with the ability to interact effectively withinternal stakeholders at all levels within the business and external customer.
• A track record of effectively assessing and managing competingpriorities.

Others:

Our purpose is to connect for a better Ireland.

Our ambition is to be the number one choice for telecommunications and technology solutions, delivering for our customers today and into the future.

Our new values and behaviours reflect both who we are and who we strive to become. They are the way that we bring our purpose to life in eir.