Senior Network Firewall Engineer

eir business; Dublin; On-site; EUR 90,000 - 130,000; Full time

Job summary

eir business is seeking a Senior Network Firewall Engineer to join a team delivering managed network services to a large Irish client. You will design, implement, operate, and support enterprise firewall and application security platforms, with a focus on Check Point and F5 technologies.

You will lead security infrastructure initiatives, engage with stakeholders, and drive improvements while maintaining high availability and compliance.

Qualifications

• Strong hands-on experience with Check Point firewalls.
• Strong operational experience with F5 LTM and SSL.
• Enterprise network security operations experience.
• Advanced level: +10 years' experience and CCNP/CCSP grade or higher.

Responsibilities

• Firewall & Security Operations: configure, manage, and support Check Point firewalls, policy management, NAT, VPNs, and updates.
• Perform firewall audits, rule reviews, and optimization.
• Operate and maintain F5 LTM and SSLi environments.
• SSL certificate lifecycle management.
• OS patching, upgrades, backups, and health checks.
• Support incident response, troubleshooting and RCA across security infrastructure.
• Plan changes, upgrades, patching, and lifecycle management of network and security platforms.
• Manage infrastructure reliability, ensuring availability and SLA compliance.
• Contribute to high-level and low-level designs for secure, scalable solutions.

Skills

Check Point firewalls

F5 LTM/SSL

Enterprise network security

Senior engineering leadership

Solution design

Incident response

Tools

Check Point

F5 LTM/SSL

VPNs

Job description

Role Purpose & Vision

eir business is seeking a Senior Firewall Engineer to join a team of network and security infrastructure professionals delivering managed network services to a large Irish enterprise client. The Firewall Engineer will be responsible for the design, implementation, operation, and ongoing support of enterprise firewall and application security platforms, with a strong focus on F5 (LTM/SSL) and Check Point technologies.

Role Title

Senior Network Firewall Engineer

Business Area

Dedicated Services

About This Role

eir business is seeking a Senior Firewall Engineer to join a team of network and security infrastructure professionals delivering managed network services to a large Irish enterprise client. The Firewall Engineer will be responsible for the design, implementation, operation, and ongoing support of enterprise firewall and application security platforms, with a strong focus on F5 (LTM/SSL) and Check Point technologies.

The role supports business-critical services, ensuring high availability, security compliance, and operational excellence You will act as a senior SME, engaging with engineers, management, and customer stakeholders to define solution approaches, agree maintenance objectives, introduce new capabilities, and drive issue resolution. You will initiate technical improvements and demonstrate leadership across the security infrastructure domain.

This is a hands-on role covering solution design and delivery, plus the management and operation of critical infrastructure to a high standard. Strong troubleshooting skills are essential.

Expectations From The Role

Key Responsibilities

• Firewall & Security Operations. Configure, manage, and support Check Point firewalls, including policy management, rule optimisation, NAT, VPNs, and security updates


• Perform firewall audits, rule reviews, and optimization


• Operate and maintain F5 LTM and SSLi environments


• SSL certificate lifecycle management


• OS patching, upgrades, backups, and health checks


• Support incident response, troubleshooting and RCA across security infrastructure.


• Perform planned changes, upgrades, patching, and lifecycle management of network and security platforms.


• Manage infrastructure reliability, ensuring availability, performance, resilience, and compliance with agreed SLAs.


• Contribute to and validate high-level and low-level designs, ensuring secure, scalable, and supportable solutions.


• Prepare and deliver customer-facing security reports, technical briefings covering firewall operations, threat activity, policy compliance, risk exposure, and remediation recommendations.

Requirements For A Successful Application

Experience

• Strong hands-on experience with Check Point firewalls


• Strong operational experience with F5 LTM / SSL.


• Enterprise network security operations experience


• Advanced level: +10 years' experience - CCNP/CCSP grade or higher


• Proven experience in large site environments within solution design, deployment delivery and management


• Strong interpersonal, influencing, and communications skills with the ability to interact effectively with internal stakeholders at all levels within the business and external customer.


• Strong track record of effectively assessing and managing competing priorities.


• Excellent communication and relationship development skills


• Highly motivated, strong attention to detail, team oriented, organised


• Advanced Checkpoint or similar Next-Gen enterprise firewall with exposure to solution design, install, patch, maintain, operate


• Security engineer practitioner mindset with practical experience managing Next-Gen security features such as IDS/IPS, Advanced Persistent Threat Protection, Anti-Malware, App Control / Web filtering and SSL Inspection


• Experience deploying and managing virtual network and security infrastructure in multi-cloud environments


• Other core techs such as F5, Citrix Netscaler, VPNs, Wifi, ISPs, DDoS, management


• platforms, AAA frameworks and perimeter hygiene solutions a plus.

Others

About Eir

Our purpose is to connect for a better Ireland.

Our ambition is to be the number one choice for telecommunications and technology solutions, delivering for our customers today and into the future.

Our new values and behaviours reflect both who we are and who we strive to become. They are the way that we bring our purpose to life in eir.

We are committed to creating an inclusive and supportive work environment. If you require any reasonable adjustments during the application or interview process, please let us know, and we will work with you to meet your needs.

If successful in the interview process, eir reserves the right to conduct appropriate suitability checks in relation to prospective employees including but not limited to reference checking and/or other searches using publicly available information.