Linux System Administrator

Inetum is a European leader in digital services. Inetum’s team of 28,000 consultants and specialists strive every day to make a digital impact for businesses, public sector entities and society. Inetum’s solutions aim at contributing to its clients’ performance and innovation as well as the common good.  

Present in 19 countries with a dense network of sites, Inetum partners with major software publishers to meet the challenges of digital transformation with proximity and flexibility.  

Driven by its ambition for growth and scale, Inetum generated sales of 2.5 billion euros in 2023.  

Ensure the availability, performance, and security of Linux Server environments and related services for multiple clients by delivering operations, automation, and Level 2/3 support with on call duty.

CONTEXT

• Shared services team of 5 administrators supporting multiple client environments (multi-tenant).
• Responsible for operational availability, performance, and security of Linux infrastructure across on-prem and cloud.
• Rotating on-call to ensure service continuity per contractual SLAs.

Main Responsibilities:

System administration:

• Install, configure, and maintain Linux servers (e.g. Ubuntu, Debian, CentOS, RHEL).
• Perform regular patching, upgrades, and system hardening.
• Manage users, groups, permissions, and sudo/access policies.
• Ensure system stability, performance, and capacity planning.

Shared services and platforms:

• Administer shared services (e.g. DNS, NTP, SMTP relays, web servers, file servers).
• Support application teams using the shared Linux infrastructure.
• Maintain and optimize virtualization and/or container platforms (VMware, KVM, Docker, Kubernetes – depending on the environment).
• Contribute to standardizing environments and configurations across multiple teams.

Monitoring, incident management, and on-call:

• Configure and maintain monitoring and alerting tools (e.g. Zabbix, Prometheus, Nagios, Grafana).
• Investigate and resolve incidents affecting shared systems and services.

Participate in a rotating on-call duty schedule (24/7 support):

• Respond to alerts within defined SLAs.
• Perform first analysis, mitigation, and escalation when needed.
• Communicate clearly with stakeholders during major incidents.
• Contribute to post-incident reviews (RCA) and continuous improvement actions.

Security and compliance:

• Apply security best practices and hardening guidelines on Linux systems.
• Work with security teams to identify, prioritize, and remediate vulnerabilities.
• Manage firewalls, VPN access, and secure remote access (SSH, bastion/jump hosts).
• Ensure compliance with internal policies and external regulations where applicable.

Backup, recovery, and continuity:

• Regularly test recovery and disaster scenarios.
• Help define and meet RPO/RTO targets for critical services.

Automation and industrialization:

• Use scripting (Bash, Python, etc.) to automate recurring operational tasks.
• Use configuration management tools (e.g. Ansible, Puppet, Chef, SaltStack) to maintain consistent environments.
• Contribute to infrastructure as code and standard operating procedures.

Documentation and collaboration:

• Create and maintain clear technical documentation, runbooks, and on-call procedures.
• Collaborate closely with application, network, security, and other support teams.
• Share knowledge within the team and help onboard new colleagues.
• Participate actively in team meetings, capacity reviews, and planning sessions.

Profile

• 3–5 years of Linux administration in operations/run environments.
• Strong troubleshooting, communication, and teamwork skills.
• Fluent in English; able to work under on‑call conditions.

Technical Skills

• Linux administration (Ubuntu/Debian/CentOS/RHEL).
• System setup, configuration, hardening, users & permissions, SSH, packages.
• Networking basics (TCP/IP, DNS, routing, firewall).
• Web servers (Apache, Nginx) & log management.
• Monitoring (Zabbix/Prometheus/Nagios), backups, Bash scripting.
• Production troubleshooting and performance diagnostics.

Nice-to-Have

• Virtualization (VMware/KVM), Docker/Kubernetes.
• Ansible/Puppet/Chef/SaltStack; Terraform/CloudFormation.
• AWS/Azure/GCP; CI/CD tools.
• Knowledge of security frameworks (CIS/ISO/NIST).

Soft Skills

• High sense of responsibility; calm under pressure.
• Clear communication with technical & non-technical teams.
• Organized, structured, and improvement‑oriented.

On-Call

• Participation in rotating on‑call schedules.
• Fast alert response & remote troubleshooting.