Senior Engineer

This Senior Engineer position focuses on the design, implementation, and support of complex Aruba-based wired and wireless network infrastructures. You will take ownership of data centre EVPN environments and campus networks, leading high‑impact changes, troubleshooting critical issues, and acting as a key technical escalation point for other engineers. The role is part‑time at two days per week and is ideal for an experienced networking professional who enjoys working hands‑on with advanced Aruba CX, ClearPass, and Aruba WLAN technologies in a demanding, enterprise‑grade environment.

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• Attend IT infrastructure design meetings to support the smooth onboarding of new wired and wireless devices and services.
  
• Produce detailed network documentation for proposed changes to enable new services and to resolve network‑related issues.
  
• Implement complex network changes that fall outside the scope of Junior Engineers, particularly within critical infrastructure such as core and aggregation layers and campus data centre EVPN environments.
  
• Provide comprehensive documentation and clear guidance to L3 Network Engineers to ensure all network changes are executed in a controlled and precise manner.
  
• Act as a technical escalation point for L3 Network Engineers, providing expert support and direction on complex incidents and changes.
  
• Own the Aruba CX EVPN data centre infrastructure, overseeing configurations and design decisions to ensure they align with best practice and project requirements.
  
• Plan and execute software upgrades across all aspects of the data centre infrastructure, ensuring stability and minimal service disruption.
  
• Troubleshoot complex network‑related issues within the data centre environment, identifying root causes and implementing robust solutions.
  
• Plan and implement network configurations for new services within the data centre EVPN infrastructure.
  
• Plan and implement network configurations for new services within campus wired and WLAN infrastructure that are beyond the capabilities of L3 Engineers.
  
• Collaborate closely with internal teams and stakeholders to ensure network designs and changes support business and public‑sector client needs.
  

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• Strong hands‑on experience with Aruba CX Layer 2 and Layer 3 implementation and troubleshooting.
  
• In‑depth knowledge of Spanning Tree protocols and their application in enterprise networks.
  
• Practical experience configuring and troubleshooting OSPF in complex environments.
  
• Proficiency with VSF and VSX stacking technologies on Aruba CX switches.
  
• Solid understanding of IPv4 subnetting and IP addressing concepts.
  
• Strong grasp of VLAN segmentation concepts and their use in secure, multi‑tenant networks.
  
• experience configuring ClearPass 802.1x service profiles and integrating them with Aruba CX 6300 edge switches for dynamic segmentation.
  
• experience deploying Aruba CX colourless ports in conjunction with Aruba ClearPass.
  
• Hands‑on experience with Aruba WLAN AOS8 deployments and troubleshooting.
  
• Ability to produce clear, detailed, and accurate network documentation for changes and designs.
  
• Proven capability to plan and implement complex network changes in production environments.
  
• Strong troubleshooting skills for data centre and campus networking issues.
  

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• experience working with advanced enterprise networking environments and data centre EVPN architectures.
  
• Familiarity with broader enterprise networking technologies such as Comware and Juniper (as part of the wider technology landscape).
  
• Ability to act as a Senior technical escalation point and mentor less experienced engineers.
  
• Strong communication skills, with the ability to explain complex technical concepts clearly to both technical and non‑technical stakeholders.
  
• Comfort working in a fast‑paced, high‑accountability environment with multiple concurrent initiatives.
  

You will contribute directly to high‑impact public‑sector projects across schools, hospitals, and other critical organisations, making your work both meaningful and visible. The role offers hands‑on exposure to cutting‑edge networking technologies, including Aruba, ClearPass, Comware, Juniper, and advanced EVPN environments, enabling you to deepen your expertise in enterprise‑grade solutions. A long‑term engagement and strong project pipeline provide stability and continuity, with a growing business unit offering the chance to shape processes, standards, and delivery models. You will enjoy Senior‑level responsibilities, with opportunities to move into leadership, mentoring, or architectural paths as the team scales. Close collaboration with multiple business units increases your visibility and opens up future internal mobility and career development opportunities.

You will work onsite in Dublin in a collaborative, fast‑paced environment, engaging closely with public‑sector clients and internal teams. The team operates with a lean structure, giving you high levels of ownership, direct communication with decision‑makers, and frequent opportunities to step into broader responsibilities. The culture emphasises high accountability and delivery focus, rewarding engineers who are proactive, reliable, and comfortable managing critical, time‑sensitive projects. xcfaprz The role is structured for two days per week, with work centred around enterprise‑class Aruba CX switching, ClearPass, and Aruba WLAN infrastructure within campus and data centre environments.

Limerick, Ireland