Network Administrator (M/F)

Actual Talent is the specialized division of Actual group, the 5th largest player in the labor and employment market in France with a resolutely humanistic vision. We deploy with our clients the talent acquisition and assessment solutions that build the performance of their organization today and tomorrow. For over 20 years, our specialized consultants within our 13 offices in France have been supporting companies in the search for executives, experts, and qualified profiles for temporary, permanent (CDI), fixed-term (CDD), or service-based contracts.

Our IT Division is supporting its client in the recruitment of their future Network Administrator (M/F) for a permanent contract (CDI). Reporting to the Information Systems Director, you will join an agile and structured IT team. You will work on a multi-site network infrastructure in a dynamic context marked by development projects, merger operations, and significant challenges regarding cybersecurity, availability, and infrastructure performance.

Missions & Responsibilities

• Multi-site administration & MCO: Supervise, administer, and maintain all multi-site network equipment in operational condition to ensure optimal availability and reliability.

• Architecture, Routing & WAN: Configure and optimize network flows by mastering IPv4 and IPv6 protocols, as well as BGP routing tables and MPLS WAN architectures.

• Switching & Local Segments (LAN): Administer access and distribution layers: Ethernet protocols, Spanning Tree (STP/RSTP/MSTP), VLAN segmentation (802.1Q), link aggregation (802.3ad / LACP), and Quality of Service (QoS).

• Remote Access & Mobility (VPN): Deploy, configure, and maintain VPN solutions (site-to-site IPsec tunnels for inter-site connections and SSL VPN mobile gateways). Wireless infrastructures (Wi-Fi)

• Manage and optimize corporate Wi-Fi access points and controllers, ensuring site coverage, access density, and connection security (802.1X, captive portals).
• Perimeter Security & Intrusion Detection: Implement and maintain firewalls, application filtering policies, Network Access Control (NAC / 802.1X), and Intrusion Detection/Prevention Systems (IDS/IPS), with a strong requirement for the Fortinet ecosystem (FortiGate).
• High Availability (HA) & Redundancy: Ensure service continuity and network core resilience via load balancers and failover mechanisms (VRRP, CARP).

• Supervision & Metrology: Monitor bandwidth, packet transit, and failure indicators using SNMP protocols and Nagios and Centreon supervision platforms.

• Manufacturer CLI Administration: Ensure advanced configurations, in-depth diagnostics, and maintenance via command-line interfaces (multi-vendor CLI).

• L2/L3 Technical Support & Diagnostics: Intervene as an escalation point for complex incidents, identify root causes, and drive corrective actions.

• Structural Projects & Mergers: Take charge of harmonization, modernization, and infrastructure connection projects during company mergers or the deployment of new sites.

• Partner Relations & Administration Standards: Coordinate technical interventions with telecom operators and external service providers, while enriching the group's network architecture standards.

Profile Sought: Education & Experience: Higher education in IT, you hold a Bac +2 specialized in IT, with 6 to 8 years of experience in a similar position in a multi-site environment. Location: Ile de France. Start date: ASAP. Contract: Permanent (CDI) with end client. Salary offered: 45 to 50 K€.

Technical Skills: Routing & Switching

• IPv4, IPv6, BGP, MPLS, Ethernet, Spanning Tree, 802.1Q, 802.3ad, multi-vendor CLI.
• Network Security & Remote Access:
• Firewall / UTM, application filtering, IPsec VPN, SSL VPN, secure Wi-Fi, 802.1X, IDS/IPS.
• Key Manufacturer:
• Good knowledge of Fortinet solutions (FortiGate).

High Availability & Metrology

• Load balancing, VRRP, CARP, SNMP protocols, Nagios, Centreon.

Fluent technical English in writing (reading manufacturer documentation, opening and tracking tickets with vendor support, drafting architectures).