Network Security Tool Manager

NextLink Group; Henegouwen; On-site; EUR 70,000 - 90,000; Full time

Job summary

NextLink Group in Mons, Belgium is seeking a Network Security Tool Manager to lead administration and improvement of enterprise cyber defense tools. You will support CSOC operations and drive the deployment, configuration, and lifecycle management of monitoring and packet capture technologies to ensure reliable network visibility.

You will collaborate with security analysts and engineers, close visibility gaps, and optimize data collection to align platforms with security objectives in a

Qualifications

• Bachelor's degree or equivalent with 2+ years in cyber defense.
• Expert knowledge of network security monitoring and enterprise monitoring environments.
• Hands-on experience with large-scale security monitoring deployments across multiple networks/sites.
• Experience with Cisco Firepower, Corelight, NetWitness.
• Knowledge of Linux and network diagnostics.

Responsibilities

• Deliver and maintain the network visibility and security monitoring capabilities required to support CSOC operations.
• Act as SME for operation, configuration, and lifecycle management of monitoring and packet capture technologies.
• Manage the lifecycle of monitoring platforms, including deployment, configuration, maintenance, upgrades, obsolescence management, and decommissioning.
• Configure, maintain, and optimize monitoring, traffic aggregation, and packet capture to support reliable data collection and analysis.
• Troubleshoot Linux, network, connectivity, performance, and data collection issues across the security monitoring environment.
• Support design and implementation of security monitoring solutions and capacity planning.

Skills

Network security

Threat detection

Threat hunting

Linux troubleshooting

Packet capture

Monitoring tools

Documentation

Vendor coordination

Education

Bachelor's degree

Tools

Cisco Firepower

Corelight

NetWitness

SIEM/SOAR

Job description

Mons (Belgium), Belgium

What is the mission about?

Nextlik is seeking a Network Security Tool Manager Working under the direction of the Team Lead and the CSOC Section Head, the incumbent will be responsible for the administration, maintenance, and continuous improvement of enterprise cyber defense tools that support network security monitoring, threat detection, and threat hunting. As part of the CSOC section, the role acts as a subject matter expert for network visibility, security monitoring, and packet capture capabilities, ensuring platforms remain reliable, effective, and aligned with organizational security objectives.

Job Description

Requirements Description:

Duties & Role:Network Security Tool ManagerWorking under the direction of the Team Lead and the CSOCSection Head, the incumbent will be responsible for theadministration, maintenance, and continuous improvement ofenterprise cyber defense tools that support network securitymonitoring, threat detection, and threat hunting. As part of theCSOC section, the role acts as a subject matter expert for networkvisibility, security monitoring, and packetcapture technologies,ensuring platforms remain reliable, effective, and aligned withorganizational security objectives. Roles & duties are as follows:

Security Tool Operations & Lifecycle Management

• Deliver and maintain the network visibility and security monitoringcapabilities required to support CSOC operations.


• Act as a subject matter expert for the operation, configuration,and lifecycle management of security monitoring and packetcapture technologies.


• Manage the lifecycle of security monitoring platforms, includingdeployment, configuration, maintenance, upgrades, obsolescencemanagement, and decommissioning.


• Configure, maintain, and optimize monitoring, traffic aggregation,and packet capture technologies to support reliable data collectionand analysis.


• Monitor platform health, availability, data quality, retention,storage utilization, and operational performance.


• Identify and address visibility gaps that may impact threatdetection or security operations.


• Maintain accurate documentation, architecture diagrams,inventories, operational procedures, and support information.


• Troubleshoot Linux, network, connectivity, performance, and datacollection issues across the security monitoring environment.

Continuous Improvement

• Support the design and implementation of security monitoringsolutions that align with CSOC requirements.


• Support integration with wider security operations, analytics, andincident management capabilities.


• Work with security analysts, detection engineering, and otherstakeholders to improve monitoring coverage and support evolvingdetection requirements.


• Conduct capacity planning and scalability assessments tosupport future growth.


• Identify operational risks, improvement opportunities, andenhancements to increase reliability, visibility, and efficiency.


• Support compliance, audit, and assurance activities related tocyber defense technologies.

Stakeholder Engagement & Project Support:

• Provide subject matter expertise and technical guidance onsecurity monitoring, network visibility, packet capture, and datacollection requirements.


• Support projects and initiatives by ensuring monitoring andvisibility requirements are considered during design,implementation, and service transition.


• Support cabling, deployment planning, and site survey activitiesrelated to security monitoring and network visibility infrastructure.


• Coordinate maintenance activities, vendor support engagements,and communications relating to platform status, risks, andimprovement opportunities.


• If requested, participate in cyber defence related exercisessupported by NCIA.


• Support the Defend Branch service delivery in the context ofNCIA Enterprise Service Delivery Model and NCIA CustomerFunded regime.


• Deputize for higher grade staff, if required.


• Performs other duties as may be required.

Requirements

Requirements Description: A minimum requirement of a Bachelor's degree at a nationallyrecognised/certified University in a related discipline and 2 yearspost-related experience. Or exceptionally, the lack of a universitydegree may be compensated by the demonstration of acandidate's particular abilities or experience that is/are of interestto NCI Agency, that is, at least 6 years extensive and progressiveexpertise in duties related to the function of the post.Essential Experience:- Expert knowledge of network security monitoring, cyber defenseoperations, and enterprise security monitoring environments.-Extensive hands-on experience supporting large-scale, distributedsecurity monitoring deployments across multiple networks, sites,segments, or data centres.- Hands-on enterprise experience with security monitoring andpacket capture platforms such as Cisco Firepower, Corelight, andNetWitness.-Proven experience in platform health monitoring, performancemonitoring, capacity management, troubleshooting, andoperational governance.- Strong hands-on experience with network visibility, trafficaggregation, packet brokers, packet capture, and relatedmonitoring technologies.- Advanced understanding of enterprise networking concepts,protocols, architectures, and data flows.- Linux and network troubleshooting experience, includingconnectivity, packet flow, interface, performance, and system-leveldiagnostics.- Practical experience supporting cabling, site surveys, andSkill, Knowledge & Experience:physical deployment activities for monitoring or network visibilityinfrastructure.- Strong knowledge of security telemetry collection, eventcorrelation, threat detection, and threat hunting concepts.Very good communication and analytical skills.Language proficiency in English: meet or exceed the NATOSTANAG 6001 Level 3 \"Professional Proficiency\".Training/certifications:- Relevant certifications in cyber security, such as CertifiedInformation Security Manager (CISM), Certified InformationSystems Security Professional (CISSP) or GIAC Security.Desirable Experience:- Experience designing large-scale security monitoring andnetwork visibility architectures.- Experience integrating security monitoring tools with SIEM andSOAR tooling.- Experience with automation, scripting, or orchestration.- Experience supporting major platform upgrades, migrations,refreshes, or service transition activities.- Prior experience in working in an international environmentcomprising both military and civilian elements.- Knowledge of NATO responsibilities and organizational structure,including ACO and ACT.Education: - A minimum requirement of a Bachelor's degree at a nationallyrecognised/certified University in a related discipline and 2 yearspost-related experience;- Or exceptionally, the lack of a university degree may becompensated by the demonstration of a candidate's particularabilities or experience that is/are of interest to NCIA, that is, atleast 6 years extensive and progressive expertise in duties relatedto those in this Statement of Work.