Senior Network Security Engineer / Architect – Contract Role

Location: 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.

• Lead Cyber Security projects delivering network-related security initiatives across a 24x7 operations network
• Design and implement enterprise data centre networks using Cisco ACI fabric design
• Configure 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 principles
• Design and optimise application delivery using Citrix Netscaler
• Implement high availability and disaster recovery strategies
• Drive automation using Python, Ansible, and REST APIs
• Provide third-level technical escalation support
• Mentor second-line engineers and promote best practice engineering standards
• Ensure network and security performance monitoring meets SLA requirements
• Develop and test failover strategies for critical infrastructure components
• Collaborate closely with application teams, operations, and external stakeholders

• CISSP (Certified Information Systems Security Professional) – essential
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• Extensive experience in:
• TCP/IP and enterprise network protocols/topologies
• Threat management & vulnerability assessment
• Identity & Access Management (I&AM)
• Network management & administration tooling
• Strong knowledge of ITIL (Change Management & Continuous Improvement)
• Excellent communication, documentation, and stakeholder engagement skills

If you are interested in this role, click 'apply' to send an updated copy of your CV to Honey Rathore or email for more details.