Senior System Specialist

Mars Athletic Club; Beşiktaş; On-site; TRY 420,000 - 540,000; Full time

Job summary

Mars Athletic Club is seeking a Senior Systems Specialist to join our IT team at the Ortaköy headquarters in Istanbul. You will manage Windows and Linux servers, AD/IDM, and virtualization infrastructure to ensure availability and security across our tech stack.

Ideal candidates have 5+ years in systems administration, strong monitoring skills (Zabbix, Grafana, PRTG), and experience with backup/DR and network security concepts. On-call and shift-based duties are expected.

Qualifications

• Bachelor’s degree in CS/IT/Engineering or related field.
• Minimum 5 years’ experience in systems administration.
• Hands-on with Windows Server and Linux (RHEL/Ubuntu).
• Experience with Active Directory and Red Hat IDM.
• Experience with virtualization platforms (VMware vSphere/vCenter or Nutanix AHV).
• Experience with backup/DR; Veeam preferred.
• Experience with monitoring tools (Zabbix, Grafana, PRTG).
• Knowledge of firewall, SSL/TLS, PKI and basic security concepts.
• Basic knowledge of WAF, Load Balancers and MSSQL.
• Familiar with vulnerability management and ISO27001/PCI-DSS.
• Ability to write/maintain technical docs and runbooks.
• Strong analytical thinking and problem-solving.
• Willingness to participate in on-call and shift-based support.

Responsibilities

• Manage installation, configuration, patching and lifecycle of Windows and Linux servers.
• Administer Active Directory / Red Hat IDM, DNS and DHCP.
• Support operation, availability and continuity of virtualization infrastructure.
• Manage backup and disaster recovery processes and restore tests.
• Monitor system health via centralized monitoring platforms.
• Provide technical support for firewall, certificates, WAF and load balancers.
• Assist remediation of vulnerability findings for audits.
• Manage access-related processes and update inventories.
• Prepare and maintain technical documentation and runbooks.
• Monitor alerts and participate in on-call rotations.

Skills

Windows Server

Linux (RHEL/Ubuntu)

Active Directory

Red Hat IDM

VMware vSphere/vCenter

Nutanix AHV

Veeam

Zabbix

Grafana

PRTG

Firewall/SSL/TLS/PKI

WAF/Load Balancer

MSSQL

ISO27001/PCI-DSS

Documentation & runbooks

Analytical thinking

On-call support

Education

Bachelor’s degree in Computer Science / IT / Engineering or related field

Tools

VMware vSphere/vCenter

Nutanix AHV

Veeam

Zabbix

Grafana

PRTG

Nessus

Wazuh

Job description

As Turkiye's largest fitness community with our MAC/One, MACFit, MAC Studio and NuSpa brands, we are looking for a Senior Systems Specialist to join our IT team at our headquarters in Ortaköy, Istanbul.

Being part of MAC means joining a community that continuously evolves, improves and moves towards a better life. Here, ideas matter, collaboration is encouraged, and feeling good is just as important as working effectively.

If you want to be part of our wellbeing community and contribute to building and maintaining a reliable, secure and scalable technology infrastructure at MAC, we would love to hear from you.

What We’re Looking For

• Bachelor’s degree in Computer Science, Information Technology, Engineering or a related field,
• At least 5 years of experience in systems administration,
• Hands‑on experience managing Windows Server and Linux environments (RHEL/Ubuntu),
• Knowledge of Active Directory and/or Red Hat IDM,
• Hands‑on experience with at least one virtualization platform such as VMware vSphere/vCenter or Nutanix AHV,
• Experience with backup and disaster recovery processes; Veeam experience is preferred,
• Experience with monitoring tools such as Zabbix, Grafana, PRTG or similar platforms,
• Knowledge of firewall, SSL/TLS, PKI and basic network security concepts,
• Basic knowledge of WAF, Load Balancers and MSSQL,
• Familiarity with vulnerability management and ISO 27001 / PCI‑DSS processes,
• Ability to prepare and maintain technical documentation and runbooks,
• Strong analytical thinking, problem‑solving and task management skills,
• Willingness to participate in on‑call and shift‑based support processes.

What You’ll Do

• Manage the installation, configuration, patching and lifecycle management of Windows and Linux servers,
• Administer Active Directory / Red Hat IDM, DNS and DHCP environments,
• Support the operation, availability and continuity of the virtualization infrastructure,
• Manage backup and disaster recovery processes and support regular restore tests,
• Monitor system health, performance and alerts through centralized monitoring platforms,
• Provide technical support for firewall, certificate, WAF and Load Balancer processes,
• Support the remediation of vulnerability findings and technical requirements related to audit processes,
• Manage access‑related processes and maintain accurate system inventories,
• Prepare, maintain and update technical documentation and runbooks,
• Monitor system alerts and perform the necessary interventions as part of on‑call support rotations.

Nice to Have

• Experience with Zabbix or Grafana,
• Familiarity with security and vulnerability management tools such as Nessus and Wazuh,
• CCNA, MCSE, Red Hat or similar technical certifications,
• Experience working with business‑critical systems and infrastructure operating 24/7,