System and Network Administrator F/H

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Published on 14/10/2025

  • Contract type:  Permanent contract

  • Work time:  Full time

  • Location Rennes

The company

Founded in 2013, Cailabs designs, manufactures, and develops innovative photonic solutions for the space, industry, telecommunications, and defense sectors. A global specialist in laser shaping, the company has accelerated its growth in the space field with turnkey optical ground stations that integrate atmospheric turbulence compensation technology. This makes it one of the first companies to harness very high data rates enabled by optics in a commercial ground station.

Cailabs currently has 150 employees, including 35 PhDs. With 29 patent families filed, the company is one of the most innovative companies in France. It is headquartered in Rennes, with offices in Paris and Washington (USA).

Post description

Joining Cailabs means becoming part of an ambitious technological project where every decision matters. You will operate in critical environments that demand high standards and strong teamwork. You’ll enjoy real technical freedom within a small, agile, and passionate team.

Reporting to the CTO, you will ensure the continuity and performance of system and network infrastructures while actively contributing to the security and evolution of both corporate and product IT environments.

Your Missions

  • Administer servers, storage systems, and LAN/WAN networks.

  • Manage and enhance identity bases (Active Directory, M365).

  • Provide Level 2 and Level 3 technical support.

  • Implement cybersecurity policies and supervise infrastructure.

  • Advise internal teams on system and network aspects of products.

  • Propose and implement relevant technical improvements.

  • Manage relationships with IT suppliers and perform technology watch activities.

 

Profile required

Your Profile

Education: Two-or three-year degree in Computer Science 

Experience: Minimum 5 years in a similar position.

Technical Skills:

  • Proficient in Active Directory, M365, Windows Server, and Linux environments.

  • Experience with virtualization (vSphere), Cisco networks (Catalyst), firewalls, and Docker.

  • Strong understanding of LAN/WAN architectures.

  • Fluent in English.

Nice-to-have:

  • Interest in cybersecurity.

  • Knowledge of PostgreSQL.

  • Enthusiasm for open-source tools.

Soft Skills:

Curiosity, rigor, pragmatism, ability to challenge and make proposals, strong sense of service and priorities.

Required languages

  • English English - Level advanced

Réf: cab1316a-317e-4a1d-9258-665b797e88cf

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System and Network Administrator F/H

Permanent contract
Full time
Rennes

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