Linux System Administrator

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.