Senior Network Operations Engineer

Alsena; Brussel Hoofdstad; Sur place; EUR 90 000 - 120 000; Plein temps

Avantages offerts par ce poste

On-site in Brussels

International projects

Career development

Résumé du poste

Alsena in Brussels is seeking a Senior Network Operations Engineer to support complex enterprise and data centre networks, focusing on operations, security and performance rather than architecture.

You will manage incidents, perform root-cause analysis, monitor KPIs, and collaborate with security and infrastructure teams to ensure availability and reliability of critical services.

Qualifications

• 8+ years of relevant professional experience in networking or related domains.
• Strong experience in network operations and production support.
• Excellent troubleshooting and root‑cause analysis capabilities.
• Experience with incident, problem and change management processes.
• Experience with network vulnerability management and remediation.
• Experience with fault, availability and performance monitoring.
• Experience with operational KPIs, SLAs and technical reporting.
• Strong understanding of enterprise and data centre networking.

Responsabilités

• Manage and troubleshoot complex network incidents in production environments.
• Participate in incident, problem and change management processes.
• Investigate recurring network issues, perform root-cause analysis and contribute to corrective actions.
• Monitor network availability, faults, capacity and performance.
• Identify, follow up and contribute to the remediation of network vulnerabilities.
• Analyse monitoring alerts and network events and take appropriate operational action.
• Perform advanced troubleshooting across enterprise, campus and data centre network environments.
• Support operational changes, maintenance activities, upgrades and configuration updates.
• Monitor operational KPIs, SLAs and network service performance.
• Prepare and contribute to technical and operational reports.
• Maintain network configurations, backups, compliance and device provisioning processes.
• Support routing, switching, wireless, VPN, firewall and network security environments.
• Contribute to network automation and operational efficiency using automation tools where applicable.
• Maintain technical and operational documentation.
• Collaborate with infrastructure, security, NOC/SOC and other technical teams.
• Participate in operational activities required to ensure the availability, reliability and security of critical network services.

Connaissances

NetOps

Incident Mgmt

Troubleshooting

Change Mgmt

Vulnerability Mgmt

Monitoring

Network Security

BGP/OSPF

LAN/WAN/SD-WAN

VPN/IPsec

NAC/RADIUS

Fortinet

F5/Net

DNS/DHCP/IPAM

Splunk

Python/Ansible

NetBox

IaC

Formation

ICT-related degree

Outils

Infoblox

NETSCOUT

Nginx

DNS/DHCP/IPAM

NetBox

Python

Ansible

Description du poste

We are looking for a Senior Network Operations Engineer to join a long-term project for a major European institution in Brussels, supporting complex corporate network infrastructure and operations.

The role focuses primarily on the operations, availability, security and performance of complex enterprise and data centre network environments. The main emphasis is on incident management, change management, problem management, vulnerability management, fault and performance monitoring, operational KPIs and reporting, and advanced troubleshooting, rather than architecture and engineering activities.

The environment covers enterprise networking, data centre infrastructure, network security, routing, wireless, VPN, monitoring and network automation technologies.

Your Role:

As a Senior Network Operations Engineer, you will:

• Manage and troubleshoot complex network incidents in production environments.
• Participate in incident, problem and change management processes.
• Investigate recurring network issues, perform root-cause analysis and contribute to corrective actions.
• Monitor network availability, faults, capacity and performance.
• Identify, follow up and contribute to the remediation of network vulnerabilities.
• Analyse monitoring alerts and network events and take appropriate operational action.
• Perform advanced troubleshooting across enterprise, campus and data centre network environments.
• Support operational changes, maintenance activities, upgrades and configuration updates.
• Monitor operational KPIs, SLAs and network service performance.
• Prepare and contribute to technical and operational reports.
• Maintain network configurations, backups, compliance and device provisioning processes.
• Support routing, switching, wireless, VPN, firewall and network security environments.
• Contribute to network automation and operational efficiency using automation tools where applicable.
• Maintain technical and operational documentation.
• Collaborate with infrastructure, security, NOC/SOC and other technical teams.
• Participate in operational activities required to ensure the availability, reliability and security of critical network services.

The Profile We Are Looking For:

We are looking for a highly experienced Network Operations professional with a strong hands‑on background in enterprise networking, network security and troubleshooting.

The ideal candidate has experience operating complex, business‑critical network environments and is comfortable handling high‑impact incidents, technical changes, performance issues and security‑related network problems.

You should have:

• Minimum 8 years of relevant professional experience in networking, network operations, telecom, data centre infrastructure or a closely related domain.
• Strong experience in network operations and production support.
• Strong troubleshooting and root‑cause analysis capabilities.
• Experience with formal incident, problem and change management processes.
• Experience with network vulnerability management and remediation.
• Experience with fault, availability and performance monitoring.
• Experience working with operational KPIs, SLAs and technical reporting.
• Strong understanding of enterprise and data centre networking.
• Ability to work independently in complex and critical technical environments.
• Experience working with multidisciplinary infrastructure and security teams.

Key Skills:

• Network Operations / NetOps
• Change Management
• Vulnerability Management
• Advanced Network Troubleshooting
• Fault & Performance Monitoring
• Operational KPIs and SLA Monitoring
• Enterprise and Data Centre Networking
• BGP / OSPF / Dynamic Routing
• LAN / WAN / SD-WAN
• VPN / IPsec
• Network Access Control / RADIUS / ClearPass
• Fortinet / Check Point
• F5 / Radware / Nginx
• Infoblox / DNS / DHCP / IPAM
• Splunk / NETSCOUT / Network Monitoring Tools
• Network Automation
• Python / Ansible
• NetBox
• Infrastructure as Code

Desired Qualifications:

• A degree in an ICT-related field is required.
• Relevant certifications from vendors such as Cisco, Aruba, Fortinet, Check Point, or equivalent, are considered an advantage.

Additional Information:

• Working regime: Full-time
• Work arrangement: Primarily on-site in Brussels. Teleworking may be possible subject to prior approval.
• In exceptional circumstances, work outside normal working days or hours may be required.
• Availability after 17:00 may occasionally be required to ensure business continuity.
• Standby or operational activities outside normal business hours may occasionally be required, particularly when interventions cannot impact end users or during major institutional events.

What We Offer:

Joining Alsena means contributing to high‑impact international IT projects within a complex and multicultural environment. You will work with large-scale enterprise and data centre network technologies, strengthen your expertise in network operations, security, automation and performance management, and contribute to the availability and reliability of critical network services.