Administrateur Systèmes & Réseaux – Sécurité & Cloud

Alta Ares; Paris; On-site; EUR 55,000 - 75,000; Full time

Job summary

Alta Ares is seeking a Systems & Network Administrator to manage IT infrastructure across Windows, macOS, Linux and cloud services including GCP and Scaleway. You will secure enterprise networks, administer IAM, MFA, SSO, and Zero Trust, and operate cybersecurity tools.

You will also handle endpoint management with NinjaOne and Apple Business Manager, automate recurring tasks with PowerShell and Bash, and document operations to support scalable IT performance.

Qualifications

• 3 to 5 years in systems and network administration.
• Strong knowledge of Windows, Linux, macOS and enterprise networks.
• Experience with IAM, endpoint management, cybersecurity tools and infrastructure monitoring.
• Scripting with PowerShell, Bash or APIs to automate tasks.

Responsibilities

• Administer and evolve IT infrastructure across Windows, macOS and Linux, including cloud services (GCP, Scaleway).
• Maintain and secure enterprise networks including LAN/Wi-Fi, VPNs, DNS/DHCP, firewalls and 802.1X/NAC.
• Manage identity and access systems (RBAC, MFA, SSO, Zero Trust).
• Administer endpoint and mobile device management (NinjaOne, Apple Business Manager).
• Operate and improve cybersecurity tools (EDR/XDR, monitoring, incident response).
• Ensure backup reliability and contribute to disaster recovery planning.
• Monitor infrastructure performance and coordinate external IT providers.
• Automate operations with PowerShell, Bash and APIs and document everything.

Skills

Windows systems

Linux systems

macOS systems

TCP/IP networking

Cloud infrastructure

IAM / MFA / SSO

EDR/XDR tools

Scripting (PowerShell, Bash)

Documentation

Collaboration

Education

Bac+2 to Bac+5 in IT

Tools

NinjaOne

Apple Business Manager

Google Workspace

Microsoft 365

GCP

Scaleway

Job description

Alta Ares is seeking a Systems & Network Administrator to manage IT infrastructure across Windows, macOS, Linux and cloud services including GCP and Scaleway. You will secure enterprise networks, administer IAM, MFA, SSO, and Zero Trust, and operate cybersecurity tools.

You will also handle endpoint management with NinjaOne and Apple Business Manager, automate recurring tasks with PowerShell and Bash, and document operations to support scalable IT performance.