Publiée le 11 juin
Mission du poste
The Linux System Administrator is responsible for ensuring the reliability, performance, and security of Linux-based systems and related infrastructure components. The role includes providing level 2-3 support, handling complex incident resolution, maintaining documentation, and participating in project and service design initiatives.
The ideal candidate has extensive experience supporting large-scale Unix/Linux environments, strong automation skills, and the ability to work cross-functionally on infrastructure, networking, security, and application hosting topics.
Your responsabilities
Operational support & troubleshooting:
Provide Level 2-3 support for Linux OS configuration, file systems, processes, log analysis, and system troubleshooting.
Diagnose and resolve issues related to hosted applications, platforms, reverse proxies, and server environments (Intranet/Internet).
Ensure proper execution of backup, Storage, and security-related operational tasks.
System Administration & Infrastructure Management:
Manage provisioning of Linux servers and VMS (including RHEL 8/9).
Maintain a reliable, standardized, and compliant operating environment.
Perform patch management, OS lifecycle operations, and migration activities.
Administer and support the OpenShift container platform.
Use GitLab for Version Control and CI/CD pipeline integration.
Participate in high availability (HA) and disaster recovery (DR) design and implementation.
Administer and support Red Hat Satellite and manage Satellite-based environments.
Administer and support Reverse Proxy platforms for on-premises and Cloud (AWS)
Automation scripting:
Develop and maintain automation using Red Hat Ansible Platform to improve reliability, repeatability, and operational efficiency.
Contribute to service design with a focus on automation and "shift-left" practices
Documentation & process:
Maintain accurate and up-to-date technical documentation and operational procedures.
Ensure compliance with ITIL processes (incident, change, problem management).
Perform activity reporting and manage operational priorities.
Organize knowledge-sharing workshops within the team.
ServiceNow for ticketing and workflow management.
Linux platforms & services:
Proxies (Squid), reverse proxies (NGINX), and nftables Firewalls configuration.
Manage SSL/TLS certificates and Linux security configurations.
Java- and Spring Boot-based webservers and Artemis MQ.
Handle client/agent support such as metricbeat, filebeats, and NetBackup.
Data transfer Moveit administration, rsync
Datacenters infrastructure and Cloud:
Support authentication systems including SAML/OIDC, ADFS, and Azure Entra ID.
Networking IPv4, Virtualization (Nutanix), databases (Oracle, PostgreSQL), and Storage (SAN, NAS, S3).
Containerisation: Kubernetes, Docker, and Podman.
Qualifications
Experience:
Minimum 8 years of proven hands-on experience managing Unix/Linux systems, ideally within a large-scale or critical production environment.
Education / Certifications (optional section, add if desired)
Degree in Computer Science, Information Technology, or equivalent experience.
Relevant certifications (RHCSA, RHCE, Kubernetes, Ansible, ITIL, etc.) are a plus.
Key competencies:
Strong expertise with Red Hat Enterprise Linux (RHEL) 8/9.
Experience with Java/NGINX application servers.
Additional knowledge:
Nutanix Virtualization
Oracle, PostgreSQL
Kubernetes / OpenShift / Docker / Podman
NGINX reverse proxy
GitLab and CI/CD pipelines
PAM/SAM solutions
Backup & Storage solutions (SAN, NAS, S3)
Advanced network knowledge (IPv4, DNS, Firewall, Routing, DMZ)
ELK Stack
Java/SpringBoot hosting architectures
Messaging systems such as Artemis MQ
Why cronos group?
We'll propose you:
An attractive salary package
A good work-life balance environment
The assurance of working in cutting-edge technologies in an entrepreneurial spirit.
The opportunity to develop your skills thanks to tailor-made training courses according to your needs
A good job in a friendly place
If you wish to integrate a dynamic structure on a human scale while working with the latest technologies, don't wait anymore and join Cronos!
