Systems and Network Administrator (2524-IT)

Ligentec SA; Corbeil-Essonnes; Sur place; Confidentiel; Plein temps

Résumé du poste

A dynamic technology company in Corbeil-Essonnes, France is seeking a Systems and Network Administrator to design and manage network systems and ensure reliable IT services. The ideal candidate will have over 5 years of experience in system administration, strong networking skills, and a solid understanding of cybersecurity principles. This position offers a flexible and dynamic work environment with a highly motivated international team.

Prestations

Flexible and dynamic start-up work environment

International and diverse team

Personal responsibility and growth opportunities

Qualifications

• 5+ years of professional experience in system and network administration within a Linux-heavy environment.
• Proven expertise with virtualization, networking, and system hardening.
• Good understanding of cybersecurity principles.

Responsabilités

• Design, maintain, and optimize network configurations.
• Administer and maintain hypervisors and VMs.
• Manage IT tickets and incidents.
• Create user documentation and IT guides.

Connaissances

System and network administration

Virtualization expertise (Proxmox, VMware)

Network management (L2/L3)

Cybersecurity principles knowledge

Professional working proficiency in English

Autonomy

Interpersonal and communication skills

Formation

Bachelor's or Master's degree in IT, Network Engineering

Outils

Proxmox PVE

VMware

Google Workspace

Docker

Description du poste

LIGENTEC is a young and dynamic European company located in Lausanne, Switzerland and Paris, France. We are manufacturing silicon nitride based Photonic Integrated Circuits (PICs) for customers in high-tech areas such as Quantum Technologies, LiDAR, Space Technologies and Biosensors. LIGENTEC All-Nitride technology enables our customers to develop their products in the industrial revolution 4.0.

To support our continued growth, we are looking for an

Systems and Network Administrator

You have the unique chance to fill this newly created position with content and be part of our growth story.

Tasks

Network Management

• Design, maintain, and optimize LAN, VLAN, WAN, iSCSI, and VPN configurations
• Configure and administer WiFi networks (UniFi), Cisco-managed switches, and routers
• Implement and maintain site-to-site and client-user VPN solutions
• Conduct network monitoring, performance tuning, and troubleshooting (L2/L3)
• Ensure network segmentation, traffic prioritization, and firewall policy management aligned with security standards

System Administration

• Administer and maintain hypervisors: Proxmox PVE and Backup Server, ensuring high availability and data integrity
• Manage and harden VMs (RHEL 9.4/9.5, Rocky 9.5, Debian 12, Windows Server 2025)
• Manage systems such as SAN storage, OPNSense, UniFi, VMWare Player
• Prepare and assign workstations (primarily Apple macOS) for new hires
• Support user onboarding/offboarding (tools, credentials, backups)
• Maintain system orchestration and perform regular updates

Tools & Software Ecosystem

• Administer solutions such as Google Workspace, Odoo, Asana, GitLab
• Evaluate, deploy, and maintain MDM solutions
• Work with various software/protocols: Bash, Docker, qemu, Ansible, Slurm, PostgreSQL, SELinux, Duplicity, GPG, SSH, LDAP, Zabbix, GLPI, Traefik, PGAdmin4
• Collaborate on the management of HPC environments and storage systems

User Support & Documentation

• Manage IT tickets and incidents through structured workflows, ensuring timely resolution
• Create and maintain user documentation and IT administration guidesContribute to the continuous update of the IT project tracking solution
• Evaluate new hardware/software technologies and drive their adoption where relevant
• Assist with deployment and maintenance of IT equipment

Requirements

Required Skills & Experience

• 5+ years of professional experience in system and network administration within a Linux-heavy environment
• Proven expertise with virtualization (Proxmox or VMware), networking (L2/L3), and system hardening
• Good understanding of cybersecurity principles and system hardening
• Familiarity with backup/restore strategies, disaster recovery, and monitoring best practices
• Professional working proficiency in English (written and spoken) is required
• French is a plus but not mandatory

Soft Skills

• Strong organizational skills and ability to work autonomously
• Flexibility and willingness to learn in a fast-moving environment
• Excellent interpersonal and communication skills
• High standards of discretion and confidentiality

Education

• Bachelor's / Professional Bachelor's / Master's degree in IT, Network Engineering, or related field

Benefits

• A flexible and dynamic start-up work environment.
• A highly international, diverse and highly motivated team.
• Personal responsibility in your job and the chance to grow with us.
• Our passion to bring PICs to every day’s life.

Activity rate: 100%
Place of work: Corbeil Essonnes, France
Start date: as soon as possible

How to apply:

We look forward to receiving your full application, including 1) your CV, 2) a statement of interest (relating the position to your skills) and 3) grade or work certificates.
Non complete applications may not be considered.