Senior Systems & Networks Administrator — Cloud & Security Focus

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

Job summary

Alta Ares in Paris seeks an IT Infrastructure Administrator to manage Windows, Linux and macOS environments, including cloud services (GCP, Scaleway). You will secure networks, manage IAM, and automate operations while coordinating with IT teams.

3–5 years' experience, strong scripting (PowerShell, Bash or APIs) and a security-first mindset are essential for driving scalable, resilient IT operations within a defense-focused environment.

Qualifications

• 3–5 years of systems and network administration experience.
• Strong knowledge of Windows, Linux and macOS; TCP/IP networking and cloud infra.
• Experience with IAM, endpoint management, security tools, and monitoring.

Responsibilities

• Administer and evolve IT infrastructure across Windows, macOS and Linux, including cloud services (GCP, Scaleway).
• Maintain and secure enterprise networks (LAN/Wi-Fi, VPNs, DNS/DHCP, firewalls).
• Manage identity and access systems (RBAC, MFA, SSO, Zero Trust).
• Administer MDM/MAM/RMM (NinjaOne, Apple Business Manager).
• Operate cybersecurity tools (EDR/XDR, vulnerability mgmt, log monitoring, IR).
• Ensure backups and business continuity planning; test restorations.

Skills

Windows

Linux

macOS

Networking

Cloud infrastructure

IAM

Automation scripting

Troubleshooting

Security mindset

Education

Degree in IT, systems and networks (Bac+2 to Bac+5)

Tools

GCP

Scaleway

NinjaOne

Apple Business Manager

EDR/XDR tools

Vulnerability management

Job description

Alta Ares in Paris seeks an IT Infrastructure Administrator to manage Windows, Linux and macOS environments, including cloud services (GCP, Scaleway). You will secure networks, manage IAM, and automate operations while coordinating with IT teams.

3–5 years' experience, strong scripting (PowerShell, Bash or APIs) and a security-first mindset are essential for driving scalable, resilient IT operations within a defense-focused environment.