Freelancer profile translated to English.
Back to original languageAbout Atréju
I support companies in stabilizing and further developing business-critical IT infrastructures.
With over 10 years of experience in the enterprise environment, I am responsible for the design, migration, and operation of Microsoft and mail infrastructures (Exchange, Hybrid, Security, AD, Virtualization).
My focus is on high availability, standardization, automation, and sustainable operational capability.
I work in a structured, solution-oriented manner and with clear end-to-end responsibility.
German
Native or bilingual
English
Conversational
French
Basic
Can work on-site
Koblenz (up to 20km)
Experience
- ENZCOM GmbHFreelance IT System AdministratorJuly 2024 - Today (1 year and 11 months)Engineering, design, and operation of the MS Exchange infrastructurePlanning, setup, and administration of the Exchange Hybrid and Exchange Online infrastructurePreparation, planning, and execution of Exchange product updatesExchange automation (Powershell)Engineering, design, and operation of the mail service (mail gateway & encryption gateway)Problem analysis and resolution in the infrastructures under supportImplementation of an application environment to standardize on-boarding, off-boarding, and operational processesImplementation of a central email gateway solution with Cisco ESA and SEPPmail to standardize email processing and utilize current security mechanisms
- Ratiodata SEFreelance IT System AdministratorJanuary 2024 - Today (2 years and 5 months)Windows Server 2019, 2022, Failover Clustering (File Service)Print Service (RICOH Streamline)Microsoft Active Directory (ADFS, DNS, ADDS, AADC, GPO)Virtual Desktop Environment & Virtual Desktop Infrastructure (Windows Terminal Server, Windows 10, VMWare Horizon)Setup of a monitoring system (CheckMK)Architecture and integration of the virtualization solution (VMware)Setup and operation of the backup service (VEEAM, HPE StoreOnce)Planning and implementation of Microsoft Exchange 2019, MailStore, F5 BIG-IP LTM including migration of Lotus Notes dataMigration and high availability concepts for file, print, AD, and SQL servicesTransformation of the VDI environment (Citrix → VMware Horizon)Introduction, integration, and operation of security and endpoint protection solutions (MECM, EgoSecure by Matrix42)
- RatiodataSystem Architect & AdministratorDIGITAL AND ITSeptember 2021 - December 2023 (2 years and 3 months)Mülheim-Kärlich, RP, GermanySystem Architect responsible for the entire customer environment. Implementation, operation, and troubleshooting of Windows Servers and backend components.
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Education
- Technical college entrance qualificationWilhelm-Remy-Gymnasium2012Fachhochschulreife
- IT Specialist for System IntegrationBarmherzige Brüder Koblenz2015
Certifications
- MECM TrainingMECM Training2022
- Exchange 2019 TrainingExchange 2019 Training2025