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Sean Hammer

@seanhammer

IT System Administrator at ProReServ GmbH maintaining infrastructure for approximately 100 users and managing Microsoft 365 environments.

Germany

Message

At ProReServ GmbH, I maintain and expand in-house IT infrastructure for approximately 100 users. I manage user and hardware lifecycles through Active Directory, Entra ID, and Microsoft 365, and provide 1st- and 2nd-Level support for critical business areas.

At Deichmann SE, I supported up to 900 employees and coordinated large-scale hardware rollouts. I also automated client provisioning using Matrix42; in my personal time, I work intensively with Linux systems and infrastructure projects.

Experience

Work history, roles, and key accomplishments

Current

System Administrator

Current

ProReServ GmbH

May 2025 - Present (1 year 6 months)

Maintains and expands in-house IT infrastructure for approximately 100 users, including user and hardware lifecycle management via Active Directory, Entra ID, and Microsoft 365. Administers Windows clients, provisions end devices with Omnissa, manages printer infrastructure with over 60 devices, and provides 1st- and 2nd-Level support.

Active Directory Entra ID Microsoft 365 Windows Omnissa Horizon Print Management IT Support

IT Support Specialist

Deichmann SE

Jun 2022 - Jul 2024 (2 years 1 month)

Provided 1st and 2nd level support for up to 900 employees, administered enterprise print services including follow-me printing, coordinated large-scale hardware rollouts, and automated client provisioning using Matrix42.

IT Support Print Service Hardware Rollout Empirum Matrix42