Network Engineer Expert (IT) / Freelance

Notre client dans le secteur Assurance recherche un/une Network Engineer Expert H/F

Description de la mission :

Contexte

The organization is seeking an expert\-level network engineering profile to lead the design, deployment, standardization, and support of a corporate office network infrastructure. The role focuses on ensuring robust, scalable, and highly available network services across enterprise environments, with strong specialization in campus LAN, WLAN, and network authentication services.

Mission

The mission is to design and evolve enterprise network infrastructure, produce the associated architecture and operational documentation, and provide expert\-level support for critical and escalated incidents. The role also acts as a subject matter expert to influence architecture standards, promote best practices, and drive network standardization across the organization.

Principales responsabilités

Design, implement, and troubleshoot office LAN/WAN routing and switching environments in medium to large enterprise contexts

Manage the full lifecycle of campus networks, including deployments, hardware refresh, OS upgrades, and patching

Produce high\-quality network documentation, including High\-Level Designs (HLD), Low\-Level Designs (LLD), operational procedures, and as\-built network diagrams

Provide third\-level operational support for critical network issues, with a focus on high availability, performance, incident resolution, and prevention

Handle complex escalated incidents and perform packet\-level analysis to diagnose network and application\-layer issues

Design and implement enterprise\-grade WiFi environments and support complex WLAN deployment models

Contribute to the design and implementation of SD\-WAN over diverse underlay networks

Use network monitoring, bandwidth, and performance analysis tools to support operations and continuous improvement

Act as an SME to define standards, promote best practices, and support network standardization across teams

Support automation, backup processes, and REST API integrations through scripting

Guide cross\-functional teams through proactive communication and mentorship

Environnement technique

Network vendors: Cisco, Aruba

Network domains: LAN, WAN, WLAN, campus networks, network authentication services, SD\-WAN

Aruba technologies: Aruba CX, VSF/VSX, Dynamic Segmentation, NAE analytics, colorless ports, NetEdit, Aruba Central, ClearPass, EdgeConnect

Cisco technologies: Catalyst, Aironet, ISE

Protocols and services: TCP/IP, HTTP/HTTPS, DNS, DHCP, IPsec, OSPF, BGP, QoS, STP, HSRP, VRRP, RADIUS, TACACS\+, SNMP, NTP, NetFlow, 802\.1X, VXLAN

Analysis and monitoring: Wireshark, IPFIX collectors, SNMP\-based NMS, LogicMonitor, SolarWinds, NetScout, Syslog servers, log analysis platforms

Automation: Shell, Perl, Python, REST API

Frameworks: ITIL

Livrables attendus

High\-Level Designs (HLD)

Low\-Level Designs (LLD)

Operational procedures

As\-built network diagrams

Standardized and scalable network architecture documentation

Incident analysis and troubleshooting outputs for critical network issues

Profil recherché

Expérience

Minimum 5 years of network experience

At least 2 years in a complex enterprise network engineering role within a sizable organization

Hands\-on experience designing, implementing, and troubleshooting enterprise LAN/WAN routing and switching

Experience managing the full lifecycle of campus network environments

Strong hands\-on experience with enterprise\-grade WiFi deployments

Compétences techniques

Strong expertise in Cisco and Aruba network environments

Advanced knowledge of modern LAN technologies and Aruba CX features

Deep understanding of TCP/IP and application\-layer protocols

Strong knowledge of routing, switching, authentication, and network services including OSPF, BGP, QoS, STP, HSRP/VRRP, RADIUS/TACACS\+, SNMP, NTP, NetFlow, 802\.1X, VXLAN, and IPsec

Experience with centralized network management, monitoring, and analysis platforms

Ability to produce high\-quality technical documentation

Basic to intermediate scripting skills in Shell, Perl, or Python

Good understanding of ITIL\-based processes including service request, change, problem, and incident management

Professional\-level certifications from major vendors such as Cisco (CCNP, CCIE) and HPE Aruba (ACSP, ACCP)

Compétences personnelles

Excellent troubleshooting capability and ability to resolve complex issues under time pressure

Strong communication skills with the ability to explain technical topics to non\-technical stakeholders

Teamwork, knowledge sharing, and support for colleagues

Analytical thinking, problem\-solving, and sound decision\-making under pressure

Attention to detail in design, implementation, and documentation

Strong task and priority management to meet project and operational deadlines

Service\-oriented mindset and responsiveness to user and client needs

Adaptability, continuous learning, and ability to handle multiple priorities

Leadership and mentorship for cross\-functional teams

Langues

Fluent English, both written and verbal

Compétences / Qualités indispensables :

Enterprise LAN/WAN routing and switching, Cisco and Aruba network engineering, WLAN / enterprise WiFi deployment, SD\-WAN design and implementation, Advanced network troubleshooting and L3 support, Technical documentation (HLD/LLD)

Compétences / Qualités qui seraient un \+ :

Hands\-on experience with private and public cloud networkingInformations concernant le télétravail :

Oui ? 3 jours/semaine

Profil candidat:

Enterprise LAN/WAN routing and switching

Cisco and Aruba network engineering

WLAN / enterprise WiFi deployment

SD\-WAN design and implementation

Advanced network troubleshooting and L3 support

Technical documentation (HLD/LLD)

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