Senior IT Infrastructure & Support Specialist

Commodity Supplies; Warszawa; Hybrid; PLN 120,000 - 180,000; Full time

Job summary

Commodity Supplies is seeking a Senior IT Support & Infrastructure Administrator to join our expanding IT team in an international setting. You will deliver advanced support, manage Microsoft 365 and Entra ID, and drive infrastructure projects across Windows and macOS endpoints, networking, and security.

The role combines hands-on IT support with infrastructure administration, requiring strong English communication and collaboration with global teams.

Qualifications

• Several years of experience in IT Support, Systems Administration, or IT Infrastructure roles.
• Bachelor’s or equivalent degree in IT/CS or related discipline.
• Professional fluency in English; conversational German is desirable.
• Relevant certifications (Microsoft, CompTIA, ITIL) are advantageous.
• Strong experience with Microsoft 365 and Entra ID.
• Experience with identity and access management, SSO, and enterprise apps.
• Hands-on experience with virtualization, Windows servers, and infrastructure admin.
• Knowledge of TCP/IP, DNS, DHCP, VLANs, networking, and troubleshooting.
• Experience in endpoint management, cybersecurity, and licensing.

Responsibilities

• Provide advanced L2/L3 support for hardware, software, network, and infrastructure issues.
• Troubleshoot complex incidents, perform root-cause analysis, and implement permanent solutions.
• Administer and support Microsoft 365, Entra ID, MFA, and SSO solutions.
• Manage users, groups, permissions, and access rights.
• Configure, maintain, and support Windows and macOS endpoints.
• Support network operations including DNS, DHCP, VLANs, switches, APs, and firewall configurations.
• Monitor infrastructure health, backups, and security compliance.
• Coordinate with external vendors and partners on issues and projects.
• Participate in upgrades, migrations, implementations, and improvements.
• Maintain technical documentation and procedures.
• Support onboarding, offboarding, and end-user training.

Skills

IT support

Systems administration

Networking

Virtualization

End-user training

English fluency

Stakeholder management

Independent work

Education

Bachelor’s degree in IT/CS

Vocational IT qualification

Tools

Microsoft 365

Entra ID

SSO

DNS/DHCP

Job description

Commodity Supplies is seeking a Senior IT Support & Infrastructure Administrator to join our expanding IT team in an international setting. You will deliver advanced support, manage Microsoft 365 and Entra ID, and drive infrastructure projects across Windows and macOS endpoints, networking, and security.

The role combines hands-on IT support with infrastructure administration, requiring strong English communication and collaboration with global teams.