Administrateur Systèmes & Réseaux H/F

Alta Ares
Paris, France
On-site

Who this role is best for

Aimed at mid-level to senior systems and network administrators who can autonomously manage complex infrastructure and security protocols.

Best fit for

  • Candidates with 3-5 years of experience in managing enterprise IT infrastructure and security in dynamic environments
    — “3 to 5 years of experience in systems and network administration, ideally in a growing or technically demanding environment.”
  • Professionals skilled in cloud infrastructure and endpoint management with a security-first mindset
    — “Experience with IAM, endpoint management, cybersecurity tools and infrastructure monitoring.”
  • Individuals who can automate IT operations and document processes effectively
    — “Automate recurring IT operations using PowerShell, Bash and APIs, while maintaining clear and up-to-date technical documentation.”

Things to consider

  • The role demands strong autonomous problem-solving and initiative in infrastructure projects
    — “Ability to take ownership of infrastructure projects and contribute to the structuring and continuous improvement of IT operations.”
  • Candidates must be prepared to work with external IT service providers and coordinate incident responses
    — “Monitor infrastructure performance, troubleshoot complex incidents and coordinate external IT service providers.”

How to stand out

  • Emphasize experience with enterprise network segmentation and Zero Trust principles in your resume
    — “Maintain and secure enterprise networks, including LAN/Wi-Fi, VLANs, VPNs, DNS/DHCP, firewalls, network segmentation and 802.1X/NAC.”
  • Highlight your track record in automating IT operations using scripting tools like PowerShell or Bash
    — “Automate recurring IT operations using PowerShell, Bash and APIs.”
  • Demonstrate familiarity with EDR/XDR tools and incident response frameworks during interviews
    — “Operate and improve cybersecurity tools, including EDR/XDR, vulnerability management, log monitoring and incident response.”
Pace · SteadyCollaboration · MediumAutonomy · MediumDecision Impact · Team

Derived from job-description analysis by Serendipath's career intelligence engine.

What success looks like

  • administer and evolve IT infrastructure
  • maintain and secure enterprise networks
  • manage identity and access systems
  • operate and improve cybersecurity tools
  • ensure backup reliability
Typical background
3 to 5 years of experience in systems and network administrationdegree in IT, systems and networks

Skills & requirements

Required

Systems AdministrationNetwork AdministrationCloud InfrastructureIAMEndpoint ManagementCybersecurityScriptingTechnical Documentation

Preferred

Google WorkspaceMicrosoft 365Edr/xdrIT Automation

Stack & domain

WindowsMacosLinuxCloud ServicesGCPScalewayIAMEndpoint ManagementCybersecurity ToolsInfrastructure MonitoringGoogle WorkspaceMicrosoft 365Edr/xdrIT AutomationPowershellBashApisAutonomousRigorousMethodicalTroubleshootingSecurity-first MindsetCollaborationTeamworkProblem-solvingAttention To DetailITSystems And Networks

About the role

Original posting from Alta Ares via Ashby

ABOUT ALTA ARES

Alta Ares is an air defense Neoprime. We build AI-guided interceptors to counter drones and cruise missiles, along with the software platform that powers them.

Our customers are NATO-aligned militaries and defense institutions, and our systems are regularly deployed during live exercises and operational demonstrations across Europe, the Middle East, and Asia.

Founded in 2024, we have grown to 90 people, raised over $60M, and increased revenue 40× this year. We are now entering a new phase of international expansion, industrial scaling, fundraising, and product development.

Role & Mission

  • Administer and evolve Alta Ares' IT infrastructure across Windows, macOS and Linux environments, including cloud services (GCP, Scaleway).
  • Maintain and secure enterprise networks, including LAN/Wi-Fi, VLANs, VPNs, DNS/DHCP, firewalls, network segmentation and 802.1X/NAC.
  • Manage identity and access systems, including RBAC, MFA, SSO, conditional access, and Zero Trust principles.
  • Administer endpoint and mobile device management solutions, including MDM/MAM/RMM, NinjaOne and Apple Business Manager.
  • Operate and improve cybersecurity tools, including EDR/XDR, vulnerability management, log monitoring and incident response.
  • Ensure backup reliability, conduct restoration tests and contribute to business continuity and disaster recovery planning.
  • Monitor infrastructure performance, troubleshoot complex incidents and coordinate external IT service providers.
  • Automate recurring IT operations using PowerShell, Bash and APIs, while maintaining clear and up-to-date technical documentation.
  • Collaborate with the IT Support Engineer and technical teams to strengthen IT operations, security and infrastructure scalability.

Candidate Profile

  • 3 to 5 years of experience in systems and network administration, ideally in a growing or technically demanding environment.
  • Strong knowledge of Windows, Linux and macOS systems, TCP/IP networking, cloud infrastructure and enterprise network environments.
  • Experience with IAM, endpoint management, cybersecurity tools and infrastructure monitoring.
  • Familiarity with Google Workspace and/or Microsoft 365, EDR/XDR solutions and IT automation.
  • Proficiency in scripting with PowerShell, Bash or APIs to automate operational tasks.
  • Autonomous, rigorous and methodical, with strong troubleshooting skills and a security-first mindset.
  • Ability to take ownership of infrastructure projects and contribute to the structuring and continuous improvement of IT operations.
  • Degree in IT, systems and networks (Bac+2 to Bac+5) or equivalent practical experience.

Source: Alta Ares careers (Ashby)

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