Network Architect Technical/Functional

Project overview

We are looking for a Technical/Functional Network Architect for a 3-month renewable mission in Niort.

In a context of Group infrastructure convergence, datacenter and campus network modernization, and security reinforcement, the Technical Directorate wishes to durably strengthen its network architecture capacity.

The mission takes place on a multi-site and critical information system, with challenges related to rationalization, resilience, observability, flow control, and compliance. It will notably contribute to network segmentation strategies, datacenter LAN renewal, WAN/Internet access evolution, and cloud environment integration.

Required technical skills:

Desired experience:

The mission will have the following objective(s):

Expected deliverables:

• Enterprise network architecture: LAN/Campus, WAN/SD-WAN, WiFi, datacenter, and cloud interconnections.
• Network security: Firewall, DMZ, NAC, VPN, WAF/load balancing, bastion, Zero Trust principles.
• Definition and design of network architectures, studies, architecture reviews, scoping, and project support.
• Writing technical architecture documents (DAT)
• Mastery of market technologies: Cisco, Fortinet, Checkpoint, F5, Aruba, Zscaler, and Azure networking.
• Synthesis, writing, workshop facilitation, consulting, and support for RUN/project teams.
• Proven experience in network architecture, in a complex, multi-site, and critical 24/7 environment.
• Significant references in network transformation or convergence, segmentation, LAN/DC renewal, and cloud integration.
• Automation/IaC appreciated: API, Ansible, Terraform, configuration management, and documentation as code.
• Experience in a regulated environment and network/security or cloud certifications are a plus.
• Define and evolve the IMA Group's network architecture, in line with the SI strategy, architecture standards and principles, and security requirements.
• Define standards, patterns, and governance rules related to flows, network security, observability, performance, and documentation.
• Produce technical architecture documents and scoping reports.
• Support network convergence and transformation projects, from the opportunity phase to production.
• Analyze the network impacts of application, cloud, and infrastructure projects, challenge proposed solutions, and formulate reasoned recommendations.
• Provide senior-level expertise during major incidents, risk analyses, and technical arbitration.
• Network architecture documents: DAT, HLD, diagrams
• Comparative studies, scoping notes, impact analyses, and technical recommendations.
• Architecture principles, standards, and decisions.
• Mappings, flow matrices, network repositories, and convergence or remediation roadmaps.
• Workshop minutes, decisions, risks, actions, and updated documentation in the Group's documentation spaces.

Project details

• Start: 2026-10-26
• Duration: 3 mois (renouvelables)
• Location: 79 - Niort, FR
• Languages: French