Find Senior network security engineer Jobs in Dublin, D

Level 3 Senior Network Engineer
ICON Plc —Dublin, County Dublin
- Full-time
- Azure
- AWS
- Analysis skills
Head of Professional Services
PFH Technology Group —Dublin, County Dublin
- Full-time
- Hybrid work
- Azure
- Management
Quick apply
Sr. Network Engineer
Glanbia Foods —Citywest, County Dublin
- Hybrid work
- Computer Science
- Bachelor's degree
Senior Platform Engineer
Mastercard —Dublin, County Dublin
- Full-time
- Communication skills
12d
Senior Site Reliability Engineer - CloudVision
Arista Networks —Dublin, County Dublin
- Full-time
- Remote
- Azure
- Computer Science
- Software troubleshooting
Quick apply
Agentic AI - Senior Software Engineer
Mastercard —Dublin, County Dublin
- Full-time
- System design
- Java
- JavaScript
12d
Senior Infrastructure Security Engineer
Crusoe —Dublin, County Dublin
- Full-time
- AWS
- Linux
- AI
Quick apply
11d
Senior Data Center Engineer, Electrical Architecture
Google —Dublin, County Dublin
- €84,000–€113,000 a year
- Full-time
- Engineering
- Master's degree
- Bachelor's degree
Senior Cyber Incident Response Analyst
Integrity360 —Dublin, County Dublin
- Windows
Senior Full-Stack Developer
Citi —Dublin, County Dublin
- €71,440–€107,160 a year
- Full-time
- Hybrid work
- Computer Science
- DevOps
- Java
Cloud Engineer
Version 1 —Dublin, County Dublin
- €65,000–€75,000 a year
- Full-time
- Hybrid work
- Azure
- Oracle
- Computer Science
- Employee assistance program
- Employee discount
Quick apply
Director of Software Engineering
Mastercard —Dublin, County Dublin
- Full-time
- Azure
- Computer Science
- DevOps
Director of Cloud, Enterprise Operations
Mastercard —Dublin, County Dublin
- Full-time
- Azure
- DevOps
- English
6d
Lead Software Engineer
Mastercard —Dublin, County Dublin
- Full-time
- Azure
- System design
- Java
Vice President & Founding Technology Lead, AI Engineering & Consulting Platforms
Mastercard —Dublin, County Dublin
- Full-time
- Computer Science
- Engineering
- Presentation skills
3d
Development Manager
Sentrium —Dublin, County Dublin
- Remote
- Team management
- AI
- Leadership
- Annual leave
Cloud Engineer, VP
Sumitomo Mitsui Banking Corporation —Dublin, County Dublin
- Azure
- AWS
Head of Product Management LIMS / LIS Clinical Diagnostics
Eurofins —Dublin, County Dublin
- Full-time
- Hybrid work
- Azure
- Analysis skills
- Continuous improvement
Quick apply
6d
Manager, Support and Retention Experience
Mastercard —Dublin, County Dublin
- Full-time
Associate Systems Administrator
CarGurus —Dublin, County Dublin
- €38,000–€48,000 a year
- On call
- Communication skills

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Level 3 Senior Network Engineer

ICON Plc -
Dublin, County Dublin

Apply Now

Job details

Full-time

Qualifications

Azure
Ansible
Load balancing
OSPF
Firewall
AWS
Analysis skills
BGP
WAN
DNS
Solarwinds
Business requirements
Communication skills
Python
Network security
VPN

Full job description

Principal Engineer II - Office Hybrid in Dublin, Ireland

ICON is a global healthcare intelligence and clinical research organisation united by a mission to bring new medicines and treatments to patients faster.

As a values-driven organisation, integrity, collaboration, agility, and inclusion are at the heart of how we work and interact with each other, customers, patients and suppliers.

Role Summary

The Level 3 Senior Network Engineer (Principal Engineer II) serves as the highest technical escalation point within the Global Network Operations team. This role is responsible for providing technical leadership, resolving complex network issues, supporting global infrastructure projects, and ensuring the stability, security, and availability of the enterprise network.

The ideal candidate should have 10+ years of hands-on enterprise networking experience, with strong expertise in Cisco ACI, Fortinet Firewalls, NetScaler/F5 Load Balancers, SD-WAN technologies (preferably CATO), enterprise routing and switching, and cloud networking. The role requires a strong balance of technical expertise, operational excellence, and project delivery within a global enterprise environment.

This is an Office Hybrid role requiring 60% office attendance in our HQ in Leopardstown, Dublin 18.

Key Responsibilities

1. Technical Leadership & Escalation

Act as the highest technical escalation point for critical network incidents and complex infrastructure issues.

Lead troubleshooting across multi-vendor enterprise network environments.

Perform root cause analysis (RCA) for major incidents and implement permanent corrective actions.

Provide technical guidance and mentorship to Level 1 and Level 2 engineers.

Participate in Major Incident Management (MIM) calls and lead technical recovery efforts.

2. Network Operations

Ensure the availability, stability, and performance of the global network infrastructure.

Support BAU operations involving routing, switching, firewalls, SD-WAN, load balancers, VPNs, DNS, and cloud networking.

Identify recurring operational issues and implement proactive improvements to reduce incidents.

Perform advanced troubleshooting across on-premises and cloud network environments.

3. Infrastructure & Project Delivery

Lead network implementation activities for global infrastructure projects.

Design, review, and implement network solutions in accordance with enterprise standards.

Support datacenter migrations, office deployments, cloud connectivity, and technology refresh initiatives.

Review implementation plans and provide technical approval for high-risk network changes.

Support mergers, acquisitions, and global expansion initiatives from a networking perspective.

4. Enterprise Network Technologies

Provide technical ownership, administration, and support for:

Cisco Core Networking (including ACI)

Cisco Meraki and Cisco ISE

Fortinet Firewalls

NetScaler/F5 Load Balancers

SASE platforms (CATO preferred)

BGP, OSPF, and enterprise routing

Network segmentation and micro-segmentation

Azure and AWS networking

Ability to automate Network tasks using scripts such as Ansible, Python, Power shell

Network performance analysis and packet capture (Wireshark/TCPDump)

Network monitoring platforms such as ThousandEyes, SolarWinds, Site24x7, or equivalent

5. Security & Compliance

Ensure network infrastructure complies with enterprise security standards and industry best practices.

Review and approve firewall policies, NAT rules, VPN configurations, and network segmentation.

Support vulnerability remediation activities and security audits.

Work closely with Cyber Security teams during incident investigations.

Implement secure network designs for new business requirements.

Skills & Qualifications

Experience

Minimum 10+ years of enterprise networking experience.

Strong experience supporting large-scale global network environments.

Experience working in 24x7 operations supporting mission-critical infrastructure.

Proven experience leading major incident resolution and infrastructure projects.

Soft Skills

Strong analytical and problem-solving skills.

Ability to lead technical discussions and major incident calls.

Excellent communication and stakeholder management skills.

Ability to manage multiple priorities in a fast-paced global environment.

Strong documentation and presentation skills.

Self-motivated with the ability to work independently and mentor junior engineers.

Preferred Certifications

CCNP Enterprise or CCIE

Fortinet NSE 7/NSE 8 or FCSS Network Security

Citrix NetScaler Certification

CATO Certified Professional

AWS or Azure Networking Certification

ITIL Foundation

Any two of the above certifications will be considered an advantage.

#LI-MK2

#LI-Hybrid

Employment with ICON is contingent upon having the legal right to work in the country where the role is based.

Rewards & Benefits

ICON offers a competitive and comprehensive total rewards package designed to support your health, wellbeing, and career development.

Benefits may include:

Competitive base salary and performance related incentives
Health and wellbeing programmes including medical, dental, and vision coverage where applicable
Retirement and pension plans
Life assurance and disability coverage
Employee assistance programmes and wellbeing resources
Learning and development opportunities through structured training and career pathways

Benefits may vary depending on role and location.

Visit our careers site to read more about the benefits ICON offers.

Inclusion and Accessibility

ICON is an equal opportunity employer. We are committed to building an inclusive and accessible workplace where everyone feels valued and supported.

If you require reasonable accommodations during the recruitment process, please let us know or submit a request .

Are you a current ICON Employee?

Apply Now

Refine Your Search

senior network security engineer jobs in dublin, d

Level 3 Senior Network Engineer

Head of Professional Services

Sr. Network Engineer

Senior Platform Engineer

Senior Site Reliability Engineer - CloudVision

Agentic AI - Senior Software Engineer

Senior Infrastructure Security Engineer

Senior Data Center Engineer, Electrical Architecture

Senior Cyber Incident Response Analyst

Senior Full-Stack Developer

Cloud Engineer

Director of Software Engineering

Director of Cloud, Enterprise Operations

Lead Software Engineer

Vice President & Founding Technology Lead, AI Engineering & Consulting Platforms

Development Manager

Cloud Engineer, VP

Head of Product Management LIMS / LIS Clinical Diagnostics

Manager, Support and Retention Experience

Associate Systems Administrator

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