Senior Linux System Administrator

Gizli Şirket; Fatih; On-site; TRY 400,000 - 620,000; Full time

Job summary

Gizli Şirket is seeking an experienced Senior Linux System Administrator to manage large-scale Unix/Linux infrastructures, implement security controls, monitor performance, and handle backups and recovery.

The ideal candidate has 5+ years of hands-on Linux experience, scripting (Bash/Python), Docker and Kubernetes, CI/CD exposure, and familiarity with ISO 27001/NIST standards.

Experience with cloud platforms (AWS/Azure/GCP) and monitoring tools (Prometheus, Grafana, Zabbix) is preferred.

Qualifications

• Minimum 5 years of experience managing large-scale IT infrastructures and enterprise-level Unix/Linux systems.
• Proficiency in Bash or Python scripting.
• Knowledge of network protocols, firewalls, VPNs and network configurations.
• Familiarity with CI/CD processes and IT governance standards.
• Experience with monitoring tools and security best practices.

Responsibilities

• Install, configure, and manage Unix/Linux servers (Red Hat, SUSE, Ubuntu, etc.).
• Implement server performance and security monitoring systems.
• Manage users and permissions; perform updates and patches.
• Monitor system performance, analyze logs, and optimize as needed.
• Configure backup solutions and test disaster recovery scenarios.
• Apply security patches and mitigate vulnerabilities.
• Maintain system documentation and runbooks.
• Work with Docker and Kubernetes for container management (preferred).
• Familiarity with COBIT, ITIL, ISO 27001 standards and CIS/NIST/PCI-DSS frameworks.

Skills

Unix/Linux administration

Bash/Python scripting

Networking & security concepts

CI/CD processes

Team communication

Education

Bachelor's degree in Computer Engineering or related field

Tools

Docker

Kubernetes

Ansible

Nginx/Apache

Prometheus/Grafana/Zabbix

SSH/Firewall/VPN

Job description

We believe that highly competitive solutions can only be developed by the motivated and enthusiastic team. That’s why our team members have been selected among the top engineers and specialists in the market. We have an urgent requirement for bright Senior Linux System Administrator with minimum 5 years of experience.

Roles and Responsibilities:

• Installation, configuration, and management of Unix/Linux-based servers (Red Hat, SUSE, Ubuntu, etc.)
• Implementation of server performance and security monitoring systems
• User and permission management
• Management of system updates and patches
• Monitoring of system performance, log analysis, and optimization efforts
• Configuration of backup solutions, execution of recovery and disaster recovery scenarios
• Application of security patches, identification of vulnerabilities, and implementation of preventive measures
• System control using log management and monitoring tools
• Container management with technologies such as Docker and Kubernetes (preferred)
• Preparation and maintenance of technical documentation
• Knowledge of standards such as COBIT, ITIL, ISO 27001
• Experience in security and risk management (CIS, NIST, PCI-DSS, etc.)
• Familiarity with technologies such as Linux Clustering, DNS servers, SAMBA, CIFS, NFS

Required Qualifications:

• Bachelor's degree in Computer Engineering, Software Engineering, or related engineering fields
• Minimum of 5 years of experience in managing large-scale IT infrastructures and enterprise-level Unix/Linux systems
• Proficiency in scripting languages such as Bash or Python
• Knowledge of network protocols, firewalls, VPNs, and network configurations
• Strong analytical and problem-solving skills
• Good communication skills and a team-oriented mindset
• Preferred Additional Skills:
• Experience with CI/CD processes
• Basic knowledge of databases such as MySQL and PostgreSQL
• Familiarity with cloud platforms (AWS, Azure, GCP)
• Proficiency with tools and technologies like Apache, Nginx, MySQL/PostgreSQL, Docker, Kubernetes, Ansible
• Relevant certifications such as RHCSA, RHCE (preferred)
• Understanding of TCP/IP, network management, and network security
• Experience using monitoring tools such as Prometheus, Grafana, Zabbix, etc.