Network Operations Engineer

Astreya; Dublin; On-site; EUR 70,000 - 100,000; Full time

Job summary

Astreya is seeking a Network Operations Engineer II to join the onsite team in central Dublin. You will diagnose and resolve complex data center network incidents, escalate as needed, and work with engineering on improvements.

This role emphasizes proactive monitoring, incident management, and collaboration with cross-functional teams. The position requires hands-on experience with routing, switching, and network performance optimization in a large-scale data center environment, with strong

Qualifications

• Bachelor’s degree in Computer Science, Networking, or related field, or equivalent experience.
• 5+ years of network operations experience, focused on Data Center networks.
• ITIL v4 experience or certification for incident and service management.

Responsibilities

• Operate and troubleshoot a globally based Data Center network, including routing and switching devices.
• Perform fault isolation and resolution for Layer 1–3 network issues.
• Take ownership of escalated cases from Tier 1 engineers and drive to resolution.
• Manage and expand critical events, communicating with stakeholders clearly.
• Provide Tier 2 support for Data Center Network repairs and assist Tier 1 engineers.

Skills

Data Center networking

Routing & switching

Troubleshooting L1–L3

Network monitoring tools

Ticketing systems

Incident management

Education

Bachelor’s degree in Computer Science or related field

ITIL v4 certification

Tools

SolarWinds

Nagios

PRTG

ServiceNow

Jira

Job description

Network Operations Engineer II - Client Onsite in central Dublin

Our Tier 2 NOC Engineer is responsible for advanced troubleshooting, fault isolation, incident escalation, and network optimization within a globally distributed data center network. This role requires deep expertise in network infrastructure, routing, switching, troubleshooting, and operational support.

The Tier 2 Engineer serves as the primary escalation point for Tier 1 engineers, taking ownership of complex cases and driving them to resolution. This position also contributes to process improvements, automation, and monitoring system enhancements to optimize network operations.

Key Responsibilities

Advanced Network Operations & Troubleshooting

• Operate and troubleshoot a globally based Data Center network, including routing and switching devices.
• Perform fault isolation and resolution, diagnosing Layer 1–3 network issues.
• Take ownership of escalated cases from Tier 1 engineers, ensuring a successful resolution.
• Manage and expand critical events, communicating clearly and concisely with stakeholders.
• Support network circuit and hardware troubleshooting, including patch panels, optics, and cabling.
• Detect and diagnose various error/failure conditions across an array of network device types.
• Provide hands‑on support for network incidents, collaborating with engineering teams when required.
• Provide Tier 2 support for all Data Center Network Repair issues, assisting Tier 1 engineers with advanced troubleshooting.
• Serve as the escalation point‑of‑contact during business hours, handling troubleshooting, tooling, and process issues.
• Coordinate with DC facilities teams on maintenance activities impacting network infrastructure.
• Own incident response processes, including escalations to higher‑level support teams when necessary.
• Rapidly respond to major network incidents, supporting SEV initiation and resolution processes.

Network Monitoring & Optimization

• Monitor the DC network infrastructure ticket queues, ensuring timely and accurate responses to alerts.
• Track and document incident resolution steps, maintaining accurate logs in ticketing systems.
• Proactively identify and resolve network performance issues, optimizing existing configurations.
• Develop and maintain network change documentation, including VLAN, subnet, and DNS modifications.
• Contribute to the creation of monitors, alerts, dashboards, and performance metrics to drive continuous improvements.
• Identify areas for automation to improve efficiency.
• Provide feedback on recurring network issues, refining troubleshooting procedures and SOPs.
• Support network optimization efforts, participating in capacity planning and scaling initiatives.

Process & Asset Management

• Document and optimize operational processes and procedures, ensuring alignment with best practices.
• Follow Return Merchandise Authorization (RMA) processes and coordinate with vendors for hardware replacements.
• Ensure accurate inventory and documentation in collaboration with audit and asset management teams.
• Monitor tickets for adherence to SLAs, ensuring prompt issue resolution.

Required Qualifications & Skills

Technical Skills

• Expertise in Data Center networking, including rack installations, routers, switches, VLANs, and routing protocols (BGP, OSPF, MPLS, etc.).
• Strong experience troubleshooting Layer 1–3 network issues in a large‑scale production environment.
• Hands‑on experience with network monitoring tools (e.g., SolarWinds, Nagios, PRTG, or similar).
• Advanced knowledge of troubleshooting IP transport/transmission networks and transceivers.
• Experience capturing and analyzing network traffic for troubleshooting.
• Proficiency with ticketing systems (e.g., ServiceNow, Jira, or equivalent).

Soft Skills & Work Ethic

• Strong analytical skills, problem‑solving mindset, and ability to work autonomously.
• Excellent communication and documentation skills for incident tracking and resolution.
• Proven ability to work in a fast‑paced, mission‑critical environment.
• Strong sense of ownership, urgency, and drive in troubleshooting and resolving network issues.

Experience & Education

• Bachelor’s degree in Computer Science, Networking, or a related field (or equivalent work experience will be considered).
• 5+ years of network operations experience, with a focus on Data Center networks.
• ITIL v4 (for incident and service management)