Sean Hammer
Sean Hammer

System Administrator

Actively looking · Member since 11 Nov 2026
Location
Gelsenkirchen, Germany
Desired salary
Unspecified
Work preference
Remote Only
Experience level
Mid

About

Professional summary

I am a System Administrator with nearly five years of experience managing Microsoft 365 environments, maintaining network infrastructure, and delivering technical support in both small and large organizations.

I manage user and hardware lifecycles using Active Directory, Entra ID, and Microsoft 365. I am experienced in administering Windows clients, including configuration, updates, patch management, and end-user device provisioning.

I provide first- and second-level support for business-critical environments and large user populations. My experience includes enterprise print services, hardware rollouts, and structured client provisioning.

I work with network infrastructure including WLAN, VLAN segmentation, and firewall administration. I also have hands-on experience with virtualization platforms such as VMware vCenter, Proxmox VE, and KVM/QEMU.

I place particular value on clean, well-structured documentation and reliable IT operations. In my personal time, I work intensively with Linux systems and infrastructure projects.

I am comfortable automating routine administration tasks with Bash scripting and Cron jobs, and I continually expand my infrastructure and systems administration knowledge.

Skills

11 capabilities

Tech stack & tools

Working toolkit

Application Hosting

Development

Experience

Career history

System Administrator ProReServ GmbH

I maintain, operate, and expand the in-house IT infrastructure for approximately 100 users. I manage user and hardware lifecycles through Active Directory, Entra ID, and Microsoft 365.

I administer Windows clients, including configuration, updates, and patch management, and provision laptops and mobile devices using Omnissa. I also manage a printer infrastructure with more than 60 devices and provide first- and second-level support for critical business areas.

IT Support Specialist Deichmann SE

I provided first- and second-level IT support for up to 900 employees. I supported users and helped maintain reliable IT operations across a large enterprise environment.

I administered enterprise print services, including follow-me printing, coordinated and executed large-scale hardware rollouts, and used Matrix42 for automated client provisioning.

Education

Learning history

IHK / Deichmann SE

IT Specialist for System Integration, System Integration

Vocational training as an IT Specialist for System Integration.

This professional hasn’t added portfolio projects yet.

This professional hasn’t listed any services yet.

Jobs Talent AI Tools Salaries
Menu