Network Security Engineer role is a 6-month contract requiring 3–4 days per week, based in Dublin with a hybrid model (minimum 2 days onsite).OverviewWe are seeking a hands-on Network Security Engineer to support network infrastructure modernization, segmentation, and operational stability. The role focuses on implementing secure architecture designs, deploying upgraded hardware, and ensuring reliable network performance in a production environment. This position is ideal for an engineer who is comfortable executing designs created by architects while also contributing technical insights and operational troubleshooting.ResponsibilitiesNetwork Segmentation: Implement and maintain segmentation solutions using Cisco Systems ISE; configure policies, authentication rules, and access controls; support identity-based network enforcement and monitoring.Network Deployment & Redesign: Configure and deploy network infrastructure based on architect designs; review existing topology and assist with improvement initiatives; support structured rollout of new network designs.Infrastructure Upgrades: Replace legacy switches with modern supported hardware; perform firmware and software upgrades on network devices; ensure minimal disruption during upgrades.Firewall Environment Support: Support rollout and integration of Cisco Firepower firewalls; collaborate with external vendors implementing firewall changes; assist with validation, configuration review, and testing.Network Management Platform: Assist deployment of Cisco Catalyst Center; use platform for provisioning, monitoring, and troubleshooting; support automation and centralized management adoption.Operational Tasks: Troubleshoot network connectivity and performance issues; install, configure, and maintain routers and switches; maintain network documentation and diagrams; monitor network health and performance metrics.Wireless (Future Scope): Assist with pilot Wi-Fi implementation if required; support configuration and troubleshooting of wireless infrastructure.Required Skills & ExperienceHands-on experience with enterprise networking environmentsStrong understanding of: Routing & switchingVLANs and segmentationNetwork security principlesExperience with Cisco network infrastructureAbility to deploy network configurations from design documentationTroubleshooting experience in production environmentsStrong documentation and communication skillsPreferred / Nice to HaveExperience with Cisco ISE deploymentsExposure to Cisco Firepower firewall platformsExperience implementing network upgrades or migrationsFamiliarity with centralized network management platformsWireless networking experienceCandidates must be eligible to work full time and long term in the location specified or currently hold a valid appropriate long term work visa to apply.eirbusiness talent, eir business and our clients are equal opportunity employers who seek to recruit and appoint the best available person for a job regardless of marital / civil partnership status, sex (including pregnancy), age, religion, belief, race, nationality and ethnic or national origin, colour, sexual orientation or disability. eirbusiness talent, eirbusiness and our clients apply all relevant Data Protection laws when processing your Personal Data.If you choose to apply to this opportunity and share your CV or other personal information with eirbusiness talent, eirbusiness and our clients, these details will be held by us in accordance with our privacy policy used by our recruitment team to contact you regarding this or other relevant opportunities at eirbusiness talent and eirbusiness.
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