Thomas Röschner - IT-Consultant

Larnaca, Cyprus

Experience

Jul 2021 - Jun 2023

2 years

IT Consultant

Self-employed / Freelancer

Upgraded the domain functional level of the production environment in Aachen from 2008R2 to 2016.
Set up and administered VMware HA cluster environments (vSphere 6 / 6.5 / 6.7 / 7 / 7.5) on Intel Xeon x86 server hardware (Dell, HPE, Fujitsu).
Designed and managed storage solutions (Nimble, Synology, QNAP, SAN) including maintenance.
Created and implemented Veeam backup strategies and administered large VMware virtualization environments.
Administered Zabbix, DNS/DHCP scopes, and adapted domain controller schemas to LDAP structures in Active Directory.
Used and maintained ticketing systems, provisioned servers (including IIS, Altrium, Winline), and performed Microsoft server installations and updates.
Maintained and operated storage systems (Synology, Nimble).

Dec 2020 - Feb 2021

3 months

IT Consultant

Self-employed / Freelancer

Customized and migrated all servers to the cloud or to data centers in Cuxhaven and Bremerhaven.
Planned and executed the migration, including infrastructure preparation and ensuring service availability.
Configured network, storage, and backup components in the new data center environment.

Oct 2020 - Oct 2020

1 month

IT Consultant

Self-employed / Freelancer

Migrated and rebuilt an IT infrastructure in a data center in Frankfurt am Main.
Planned and implemented server and network environments, including virtualization.
Ensured system availability and performance in the new data center setup.

Feb 2020 - May 2020

4 months

IT Consultant

G-LOG

Built the entire server and client infrastructure.
Planned and implemented the Windows and network environment.
Introduced backup, security, and administration processes for the new infrastructure.

Jun 2019 - Feb 2020

9 months

Administrator

ITZBund

Jan 2019 - Jun 2019

6 months

Server / VMWare Administrator / Script Developer

Friatec / Aliaxis

Aug 2018 - Present

7 years 5 months

IT-Consultant

Self-employed / Freelancer

Working as a self-employed IT consultant and system administrator focusing on Microsoft and virtualization infrastructures.
Carrying out various projects in server administration, virtualization, data center migrations, and cloud migrations.
Implementing modern backup, storage, and monitoring solutions in enterprise environments.

Aug 2018 - Jan 2019

6 months

Server Administrator (Freelancer)

Heinzel

Jun 2017 - Feb 2018

9 months

System Administrator

Bahag AG

Administering POS cash register systems based on Windows 10 across Europe.
Managing server and client environments in branch and central settings.
Ensuring availability and stability of POS and backend systems.

Feb 2017 - Apr 2017

3 months

System Administrator

Brandmauer IT

Nov 2014 - Jan 2017

2 years 3 months

System Administrator

Wircon Interservices GmbH

Operation and further development of a hosting environment.
Web hosting with Debian Server in an HA cluster on Xen and ESXi.
Installation, configuration and maintenance of vServers in the HA cluster.
Administration of the Active Directory environment of Office Server 2012, Citrix servers and SQL servers.
AD administration for external corporate clients and network monitoring of all servers and clients with Hobbit.
Expansion of the data center with servers, storage and HP and Cisco switches.
Connection of the data center and office network internally and externally via LAN, fiber optics and microwave link.
Expansion of video surveillance in indoor and outdoor areas.
Setup and administration of VPN for office laptops and routers using OpenVPN.
Client support in the office with Windows 8.1 and 10 and printers from Canon and Kyocera.
Office migration to Microsoft Office 365 and Outlook 2016.
Exchange Server administration in Office 365.
Installation of license servers for AutoCAD, Autodesk LT, iTWO, Print2CAD and See Electric Advanced.
Installation and programming of IP phones as well as smartphones (Android, Apple iOS, Windows Phone).
Evaluation of DJI drones for use in solar parks.
Creation and testing of 3D models for 3D printing with the Witbox 2.
Third-level support of WHMCS as well as Plesk and cPanel via a ticket system.
Construction of control and monitoring cabinets for solar parks with Beckhoff systems and connection via LTE and VPN to the company headquarters.
Administration of various backup systems (Xen, Norton, cloud backup).
Global OwnCloud administration.

Jan 2014 - Oct 2014

10 months

Further training

Jun 2013 - Dec 2013

7 months

System Administrator

Caritas e.V.

Administration of Windows 8.1 environments and Office 2013.
User support for Office and Windows clients.
Server administration of Citrix and Microsoft servers (2008/2012) in all branches.

Nov 2012 - May 2013

7 months

MCPD certification participant (.NET C#)

Gfn-AG

Jan 2011 - Jun 2012

1 year 6 months

Application Engineer (External)

Lufthansa Technik

Work as external Application Engineer at Lufthansa Technik in Frankfurt.
Application engineering, software packaging and SCCM deployment.
Software evaluation for Windows operating systems.
Use of VMware ESX and VMware Workstation 7.x/8.0.
Scripting for wrappers in SCCM rollout.
Working with Novell, I2L and MS Office 2010.
Customization of Lufthansa internal program scripts for Windows 7.

Feb 2008 - Dec 2010

2 years 11 months

Support Engineer (Developer Support, HANA Project)

SAP Labs

Jan 2007 - Feb 2008

1 year 2 months

Support Engineer

Vorstandssupport (Board Area), SAP AG

Support for the board area (board members, assistants, and secretaries).
Management of conference rooms, video conferences, and Cisco Telepresence systems.
2nd-level support for client environments (Windows and standard applications) for top management.

Mar 2000 - Dec 2007

7 years 10 months

Walldorf, Germany

Support Engineer

SAP AG

Planning and implementing Windows servers (2000, 2003, 2008 R2) in enterprise environments.
Migrating Windows NT 4.0 to Windows 2000/2003/2008.
Troubleshooting in Active Directory as well as analyzing and fixing hardware and software problems.
Replacing and maintaining computer hardware (network, graphics, storage, motherboard cards, TFT monitors).
Solving dial-in issues on laptops (software, hardware, user errors).
Resolving network issues (access to network resources) and replacing network components in the frontend area (hubs, switches, cables, fiber optics).
Network management and administration, data backup for users, and data recovery of defective hard drives.
User support for hardware and software usage.
Installing and configuring firewalls and MS SQL Servers.
Server installations, server administration, and troubleshooting R/3 applications and transactions.
Supporting customer standard software.
Installing and troubleshooting Windows NT 4.0, Windows 2000, XP, and Vista Enterprise.
2nd-level support for client environments including MS Office, Windows 98/2000/XP, Windows Server 2003/2008, SAP R/3, antivirus, firewalls, SafeBoot, databases, and encryption software.
Supporting PCs, servers, networks, mobile phones, BlackBerrys, UMTS cards for laptops, projectors, and printers.
Managing the server environment in a Windows 2003/2008 environment for a major client.
Administering the server landscape and monitoring hardware with HP Insight Manager 7.0.
Support in the client environment on Windows XP with Office 2003/2007/2010 and Outlook.
Administering the server landscape on Windows 2003 and managing SharePoint Portal Server 2003.
Data backup with Veritas Backup Exec 10.5.
Setting up new group policies worldwide.
Planning, preparing, and implementing a migration from NT 4.0 to Windows 2003 Active Directory.
Migrating Exchange 5.5 to Exchange 2003.
Planning, integrating, and configuring Microsoft WSUS deployment.
Designing hardware for building the server landscape and performing the migration.
Implementing antivirus solutions and remote access (VPN, UMTS) including WSUS server installation, GPO creation, and testing synchronization between downstream/upstream servers and clients.
Planning and executing a Windows 2000 migration to Windows 2003 Active Directory including server installation, migration, NT backup setup, and remote access with Cisco dial-up routers.
Planning and carrying out a data center relocation with consolidation of several Windows 2000 server systems.
Planning and installing network infrastructure, commissioning network components, and planning and installing Exchange 2003 including data backup with Veritas Backup Exec 10.5.

Aug 1996 - Oct 1996

3 months

Ludwigshafen, Germany

IT Intern

AOK

Supporting the network switch from Novell to TCP/IP.
Assisting in migrating network services and clients to the new infrastructure.

Jan 1996 - Dec 2000

5 years

Balneário Camboriú, Brazil

IT tasks in the client-server environment

Performing IT tasks in the client-server environment.
Network connections and support for PCs and laptops.

May 1995 - Aug 1995

4 months

Mannheim, Germany

Chemical plant operator

Boehringer Mannheim

Sep 1993 - Dec 1994

1 year 4 months

Ludwigshafen, Germany

Lab technician

Alcoa

Worked as a lab technician in the chemical sector (fixed-term contract).

Jul 1990 - Jun 1991

1 year

Germany

Soldier / Senior Lance Corporal (maintenance / staff services, responsible for IT tasks)

Bundeswehr

Performed military service with the rank of Senior Lance Corporal.
Worked in maintenance and staff services.
Responsible for IT-related tasks in my area of responsibility.

Skills

Hardware: Hp Servers, Dell Servers, Lenovo/fujitsu Laptops, Workstations, Dual Hexacore Hp Developer Workstations (Hp Z600)
Operating Systems: Windows 7 / 8.x / 10 / Server 2003 / Server 2008 R2 / Server 2012
Tools/software: Microsoft Office 2013/2016 & O365, F5 Vpn Client, Sso Single Sign On, Sap Gui, Ipass, Mcafee Antivirus, Iron Mountain Backup Tool, Citrix, Vmware Client, Hp System Insight Manager 7.0, Microsoft Operations Manager 2005, Sysinternals, Recovery Tools
Network Knowledge: Routers, Managed Switches, Tcp/ip, Network Infrastructure (Wins, Dns, Dhcp)

Languages

German

Native

Portuguese

Advanced

Education

Sep 1995 - Dec 1996

CDI

Apprenticeship as a PC administrator · PC Administrator · Mannheim, Germany

Jun 1991 - May 1993

Franz Zang School for Natural Sciences

Apprenticeship as a Chemical Technical Assistant (CTA) · Chemical Technical Assistant (CTA) · Ludwigshafen, Germany

Jun 1987 - May 1990

Technical High School

Technical high school diploma · Heidelberg, Germany

...and 1 more

Certifications & licenses

MCPD (App Developer for Enterprises in .NET C#)

Gfn-AG

MCTS .NET Framework 3.5, ADO.NET Applications

MCTS .NET Framework 3.5, ASP.NET Applications

MCTS .NET Framework 3.5, Windows Forms Applications

MCTS Windows 7: Configuration

MCTS Windows Server 2008 Active Directory, Configuring

MCTS Windows Server 2008 Network Infrastructure, Configuration

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System Administrator

Caritas e.V.

MCPD certification participant (.NET C#)

Gfn-AG

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Lufthansa Technik

Support Engineer (Developer Support, HANA Project)

SAP Labs

Support Engineer

Vorstandssupport (Board Area), SAP AG

Support Engineer

SAP AG

IT Intern

AOK

IT tasks in the client-server environment

Chemical plant operator

Boehringer Mannheim

Lab technician

Alcoa

Soldier / Senior Lance Corporal (maintenance / staff services, responsible for IT tasks)

Bundeswehr

Skills

Languages

Education

CDI

Apprenticeship as a PC administrator · PC Administrator · Mannheim, Germany

Franz Zang School for Natural Sciences

Apprenticeship as a Chemical Technical Assistant (CTA) · Chemical Technical Assistant (CTA) · Ludwigshafen, Germany

Technical High School

Technical high school diploma · Heidelberg, Germany

Certifications & licenses

MCPD (App Developer for Enterprises in .NET C#)

Gfn-AG

MCTS .NET Framework 3.5, ADO.NET Applications

MCTS .NET Framework 3.5, ASP.NET Applications

MCTS .NET Framework 3.5, Windows Forms Applications

MCTS Windows 7: Configuration

MCTS Windows Server 2008 Active Directory, Configuring

MCTS Windows Server 2008 Network Infrastructure, Configuration

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