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Senior Network Security Engineer

Senior Network Security Engineer

On site

Massy, France

Senior

Freelance

08-01-2026

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Skills

Communication Network Security Firewalls Ansible Networking Training

Job Specifications

We are seeking a Senior Network Security Engineer to design, build, and secure complex network infrastructures. This role is focused on Build (95%) with limited Run (5%) responsibilities.

Key Responsibilities:

• Design, adapt, and implement network and security solutions (LAN, WAN, Firewalls, Telephony).

• Collaborate with architects, security leads, and operations teams to integrate new technologies.

• Lead projects through scoping, POC, integration, and provide operational support.

• Maintain documentation and ensure standards compliance.

• Propose performance improvements and enforce best practices in network/security management.

• Provide consulting, training, and technology watch in your domain.

Technical Environment:

• Networking & Security: Cisco (Catalyst, Nexus, Wi-Fi, ISE), HPE, Palo Alto, Stormshield, Forcepoint, Infoblox, Ucopia, NAC Clearpass.

• Tools: AlgoSec, Tufin, Ansible.

Profile:

• Strong expertise in routing, switching, firewalling.

• Proven experience in complex network/security projects.

• Ability to work evenings/weekends when required.

• Excellent communication and collaboration skills.

About the Company

We focus on delivering high-performance and premium services to diverse organizations. ThoughtBot is a team of software engineers, programmers, technology experts and technical recruiters who work together to provide our clients with outstanding services. What we do? * IT Consultation * IT Staffing * Web Development * Mobile App Development * IT Consultation In this high-tech and digitalized world, you may be stuck in certain things. You need to analyze your current business practices, approach and standings in technologie... Know more