Job description

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.

Key Responsibilities

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

Required Skills & Qualifications

CCIE (Cisco Certified Internetwork Expert) – essential
CISSP (Certified Information Systems Security Professional) – essential
Extensive experience in:
- Security architecture design & implementation
- Cisco firewalls, ACI networks, LAN/WAN, VPN environments
- TCP/IP and enterprise network protocols/topologies
- Threat management & vulnerability assessment
- Identity & Access Management (I&AM)
- Network management & administration tooling
Excellent communication, documentation, and stakeholder engagement skills
Strong knowledge of ITIL (Change Management & Continuous Improvement)

If 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.

Please note:

We have a number of similar positions currently, and in the future, which we would like to discuss with you should you indicate your interest in this role. When we receive your application for this role, we will contact you to advise you of our process for other similar positions.

Stelfox is fully compliant with GDPR regulations and you can read more in our privacy policy here: https://www.stelfox.com/privacy-policy-gdpr/

Your shared data will not be disclosed or transferred to a third party data controller or data processor located outside the EEA unless we have obtained your express consent.

We look forward to working with you.