Senior IT SpecialistIstanbul, TR

Building reliabletechnology systems.

I work across enterprise infrastructure, Microsoft technologies and IT operations — turning complex technical environments into dependable, efficient systems.

Oğuz Berkin Tümkaya
Current role

Senior IT Operations Administrator

Kolay Gelsin · Koç Group

Systems online
99.9%
Kolay Gelsin
Active DirectoryMicrosoft 365Entra IDExchange OnlineIntuneWindows ServerSCCMDHCPFile ServerPrint ServerOutlookMDMActive DirectoryMicrosoft 365Entra IDExchange OnlineIntuneWindows ServerSCCMDHCPFile ServerPrint ServerOutlookMDM
01

Profile

Technology with
purpose.

I am a Senior IT Specialist with hands-on experience in IT infrastructure, system administration, and technical support.

I enjoy solving complex technical challenges and continuously improving my skills to deliver reliable and efficient solutions.

3+

Years in enterprise IT

24/7

Operations mindset

Curiosity for technology

Oğuz Berkin Tümkaya at work
IstanbulEnterprise IT
02

Career

Experience

  1. 01

    DEC 2025 — PRESENT

    Kolay Gelsin logo

    Senior IT Operations Administrator

    Kolay Gelsin·Koç Group


    • Active Directory administration
    • Entra ID, Microsoft 365, Microsoft Exchange and Microsoft Intune administration
    • Exchange Online and Outlook configuration and administration
    • Print Server and File Server administration
    • DHCP administration
    • SCCM administration
    • Microsoft Windows operating system troubleshooting and support
    IT OperationsInfrastructureMicrosoft
  2. 02

    OCT 2022 — OCT 2025

    Otokoç Otomotiv A.Ş. logo

    System Support Specialist

    Otokoç Otomotiv A.Ş.


    • Microsoft Windows systems troubleshooting and support
    • Active Directory administration
    • Microsoft 365, Microsoft Exchange and Microsoft Intune administration
    • Exchange Online and Outlook configuration and administration
    • DHCP administration
    • End-user support and VIP employee support
    • Microsoft MDM administration
    • Hardware installation and support
    System SupportWindows ServerEnterprise IT
03

Capabilities

Core Expertise

Key areas of expertise built through hands-on experience in enterprise IT environments.

Microsoft Technologies
01

Microsoft Technologies

Microsoft 365, Exchange Online, Entra ID, Intune, and enterprise cloud administration.

Microsoft 365Exchange OnlineEntra IDIntune
System Administration
02

System Administration

Windows Server, Active Directory, DHCP, File Server, Print Server, and SCCM management.

Windows ServerActive DirectoryDHCPSCCM
Technical Support
03

Technical Support

Enterprise IT support, troubleshooting, VIP user assistance, hardware deployment, and operational excellence.

TroubleshootingVIP SupportDeploymentITSM

Contact

Get In Touch

Let's connect! Feel free to reach out through any of the channels below.

Message

Send a Message

Have a question or a project in mind?
I'd be happy to hear from you.

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Senior IT SpecialistOğuz Berkin Tümkaya
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