System Administrator – Cloud & On-Premise

About the role

CoreNetworks is seeking a motivated System Administrator to join its Technical Department in Athens. You will manage both cloud and on‑premise environments, ensuring reliability, security, and high performance of the company’s IT infrastructure.

Key responsibilities

• Administer Microsoft 365 / Office 365 tenant (users, Exchange, SharePoint, Intune, Security & Compliance).
• Provide support for on‑premise and cloud servers, virtualization, and networking environments.
• Implement security best practices and maintain system reliability.
• Troubleshoot system and service issues to guarantee high availability.
• Collaborate with internal teams on infrastructure projects and improvements.

Required profile

• Minimum 2 years of proven system administration experience.
• Good understanding of networking concepts such as DNS, DHCP, VPN, and firewalls.
• Valid driving licence and own vehicle for client visits.
• Fluent in Greek and English with strong communication skills.

Required skills

• Microsoft 365 / Office 365
• Exchange, SharePoint, Intune, Security & Compliance
• Linux (Ubuntu, CentOS)
• PowerShell, Bash, scripting
• Virtualization technologies
• Cloud and on‑premise server management
• Networking, DNS, DHCP, VPN, firewalls

What we offer

• Competitive compensation package.
• Opportunity to work with modern cloud and IT technologies.
• Continuous learning and professional development.
• Friendly, supportive work environment.
• 3‑month probation period followed by full integration.