Senior Network Security Engineer / Architect – Contract RoleLocation: Dublin, Ireland (Hybrid – 3 days on-site, 2 days remote per week)Contract: Initial 6 months (with potential extension)Stelfox is partnering with a leading Dublin-based organisation to hire an experienced Senior Network Security Engineer / Architect to deliver strategic, security-driven network transformation initiatives across a critical 24x7 operations environment.Key ResponsibilitiesLead Cyber Security projects delivering network-related security initiatives across a 24x7 operations networkDesign and implement enterprise data centre networks using Cisco ACI fabric designConfigure and manage Cisco NGFW capabilities including IPS, Security Intelligence, Portscan Detection, and Encrypted Visibility Engine (EVE)Perform firewall lifecycle management (upgrades, policy optimisation, health monitoring)Develop secure network segmentation strategies aligned to zero-trust principlesDesign and optimise application delivery using Citrix NetscalerImplement high availability and disaster recovery strategiesDrive automation using Python, Ansible, and REST APIsProvide third-level technical escalation supportMentor second-line engineers and promote best practice engineering standardsEnsure network and security performance monitoring meets SLA requirementsDevelop and test failover strategies for critical infrastructure componentsCollaborate closely with application teams, operations, and external stakeholdersRequired Skills & QualificationsCISSP (Certified Information Systems Security Professional) – essentialExtensive experience in:TCP/IP and enterprise network protocols/topologiesThreat management & vulnerability assessmentIdentity & Access Management (I&AM)Network management & administration toolingStrong knowledge of ITIL (Change Management & Continuous Improvement)Excellent communication, documentation, and stakeholder engagement skillsIf you are interested in this role, click 'apply' to send an updated copy of your CV to Honey Rathore or email honey@stelfox.com for more details.
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