Network Security Engineer – Deployment and Support

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About the role

About the Job    As 'Network Security Engineer – Deployment and Support' within our Digital Technology Service Quality team, you will build, deploy, and support the network security estate that protects Sanofi's enterprise — firewalls across Cisco ASA and FTD, Fortinet FortiGate, and Juniper SRX, Web Application Firewalls, DDoS protection, VPNs, and the Zscaler cloud security platform. You will deploy security infrastructure and policy as code using Terraform, Ansible, and Python wherever the platform allows, and apply the same engineering rigour where it does not. You will own what you deploy — from policy definition and automated pre-change validation through to day-two operations, rule lifecycle hygiene, and incident response — ensuring our network security posture remains accurate, auditable, and resilient. Ready to get started?    Our Team    Digital Technology – Service Quality is at the heart of Sanofi's digital transformation. We deliver secure, resilient, and scalable infrastructure services that power business-critical applications and enable thousands of users across the enterprise. Our network security engineering team sits at the boundary of every service we run — enforcing segmentation, controlling access, and giving our security operations colleagues the visibility they need. Our team combines modern cloud platforms, automation-first engineering, and service excellence to support Sanofi's mission of chasing the miracles of science.    About Sanofi    We're an R&D-driven, AI-powered biopharma company committed to improving people's lives and delivering compelling growth. Our deep understanding of the immune system – and innovative pipeline – enables us to invent medicines and vaccines that treat and protect millions of people around the world. Together, we chase the miracles of science to improve people's lives.    Main Responsibilities    Network Security Deployment – Infrastructure and Policy as Code    • Deploy cloud network security infrastructure as code using Terraform, provisioning security groups and network security groups, cloud-native firewall and WAF policy, route tables, private connectivity, and inspection architectures across AWS and Azure, with reusable modules, remote state management, and plan review built into the change process  • Deploy and maintain firewall and network security configuration as code using Ansible, building reusable roles and templates for Cisco ASA and FTD, Fortinet FortiOS, and Juniper SRX so that every change is repeatable, version-controlled, and auditable  • Automate security provisioning and operational tasks in Python, consuming platform APIs — Junos Space for SRX estate management, Cisco APIC for ACI contract and microsegmentation policy, FortiGate and FortiAnalyzer APIs, Zscaler APIs, and F5, Array, and AVI load balancer and WAF APIs  • Automate vendor web consoles and portals that expose no usable API using Selenium, so that licensing, reporting, and legacy management interfaces do not force manual work  • Use Gemini CLI as an AI agent within the engineering workflow to accelerate policy review, triage large firewall log and packet-capture data sets, summarise rule-base findings, draft runbooks and knowledge articles, and scaffold Ansible and Python automation  • Maintain Git as the source of truth for network security configuration, with golden configuration templates, peer-reviewed changes, and a full version-controlled audit trail of every policy change  • Operate deployment pipelines for network security change, including automated pre-change validation, policy risk and compliance checks using AlgoSec, and automated post-deployment verification of traffic flow and policy hit behaviour  • Implement configuration drift detection and automated remediation, so deployed

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