System and Network Administrator

ITRS Group

. Oversee and maintain the mobile platform, network infrastructure and fleet of mobile devices to guarantee continuous operational performance.

Posted 10/8/2026full-timeParis • FranceMid-LevelSeniorWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates expertise in network infrastructure design, management of mobile platforms, and technical troubleshooting. Proficient in providing multi-tier support and mentoring junior staff while ensuring operational performance and service continuity.

Highest-signal resume keywords

Network Infrastructure DesignMobile Device Management (MDM)Tier 1 to Tier 3 SupportNetworking Certifications (CCNA, CCNP)Technical Troubleshooting

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

TCP/IPVLANsRoutingSwitchingFirewallsVPNWi-FiHardware InstallationCablingNetwork Monitoring

Soft Skills

LeadershipCoachingClear CommunicationPlanningProblem-Solving

Certifications & Qualifications

Cisco CCNACisco CCNP

Industry Keywords

Mobile Platform ManagementNetwork AdministrationData-Center OperationsTechnical SupportOperational Performance

Tech Stack

Tools & technologies

FirewallsSwitchingTCP/IP

About the role

Key responsibilities & impact

Oversee and maintain the mobile platform, network infrastructure and fleet of mobile devices to guarantee continuous operational performance.
Design, build and document network infrastructure, from architecture and addressing through to switching, routing, firewalls and wireless.
Monitor platform and network health, and find and fix the root cause of incidents rather than only the symptoms.
Supervise and work closely with the Operations Team dedicated to the mobile platform.
Train, guide and work daily with the apprentice assigned to the mobile platform, building their skills on the job.
Support the IT Manager on-site in data-centers whenever hands-on support, hardware maintenance or troubleshooting is needed.
Provide Tier 1 to Tier 3 support to users and infrastructure, and escalate or resolve issues at the right level.
Take an active part in core IT team projects, and deliver owned projects on time.
Handle daily technical communication in English with international teams, keeping colleagues informed on changes, incidents and progress.

Requirements

What you’ll need

Proven experience as a systems and network administrator, with strong, hands-on network infrastructure expertise.
Experience designing and building a complete network infrastructure, not only operating an existing one.
Solid knowledge of networking fundamentals and equipment: TCP/IP, VLANs, routing, switching, firewalls, VPN and Wi-Fi.
Experience managing a mobile platform and a fleet of mobile devices, including enrolment, configuration and security.
Hands-on experience working in data-centers, including hardware installation, cabling and maintenance.
Experience providing Tier 1 to Tier 3 support across users and infrastructure.
Experience supervising, training or mentoring others, such as junior staff, apprentices or an operations team.
Professional working proficiency in English, written and spoken, and fluency in French.
Ability to work on-site in our Paris office and travel to local data-centers as needed.
Experience with Mobile Device Management (MDM) tools. (desirable)
Networking certifications such as Cisco CCNA or CCNP. (desirable)
Strong technical troubleshooting and structured problem-solving under pressure.
Ownership and reliability; treats uptime and service continuity as personal responsibilities.
Leadership and coaching; brings out the best in a small team and an apprentice.
Clear communication in English with technical and non-technical colleagues across countries.
Planning and delivery discipline across support work and projects.
Documentation habits that leave systems easier for others to run.

Benefits

Comp & perks

Employee Assistance Programme
Flexible Hybrid Working
Enhanced Parental Leave
Travel Insurance
Life Assurance
Income Protection
Referral Bonus
Buy and Sell Holiday
Training Reimbursement