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Senior System Administrator & Team Lead
PHINIA · 04.2022 – Present
- End-to-end management of IT systems covering data center, software and network infrastructure, ensuring operational continuity, performance and sustainability
- Leading the IT team (Help Desk and Global Service Desk)
- Managing server hardware, periodic maintenance and storage systems
- Managing Microsoft and Linux servers, IoT application servers and database servers
- Designing and operating a secure, isolated, high-performance communication architecture for the IoT network
- Managing the VMware vCenter cluster (HA) architecture
- Managing and optimizing Ceph-based distributed storage and HA clusters on Proxmox VE
- Managing the Zabbix monitoring and alerting system
- Managing MES and RTS servers; data flow through RRAS and OPC Router
- Creating and managing firewall rules for the secure integration of special production-line machines into the computer and PLC network
- Developing in-house software solutions and integrating them into business processes
- Designing backup, data protection and disaster recovery strategies for server and IoT systems
- Network management on L2 and L3 active devices; migration from ring to star topology and segmentation of a flat network with VLANs
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System Administrator
IBG - İzmir Uluslararası Biyotip ve Genom Merkezi · 12.2018 – 04.2022
- Managing, auditing and maintaining all IT systems and network infrastructure, including data center hardware
- DevOps practices with software teams: preparing standardized application environments on Linux with Python (venv), Django, Gunicorn, Nginx and MariaDB
- Managing SMB, iSCSI and NFS file systems and the backup system on TrueNAS
- Managing the forest root domain and distributed Additional Domain Controller architecture
- Managing Proxmox (KVM) clusters and HA architecture; scheduled backups with Proxmox Backup Server
- Monitoring server and hardware metrics with Zabbix
- 802.1X network access control with FreeRADIUS and Active Directory integration
- Star topology migration, VLAN configuration, department-based static routes and ACLs; data transfer to the disaster recovery center using LACP
- VLAN-based security policies and Active Directory integration on Palo Alto L7 firewall
- Application hosting and cron-based backups on a Linux LEMP platform; deploying WordPress sites
- Developing and operating the in-house AIS (Asset Information System) on Linux using Nginx, Gunicorn and virtual environments
- Integrating NTFS permissions on Microsoft File Server with Active Directory; automated user profile management with PowerShell
- Managing Nextcloud, WSUS and Open-AudIT; organization-wide security policies via GPO
- VLAN-based Squid proxy architecture on pfSense
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Information Systems Specialist
JTI (Japan Tobacco International) · 08.2016 – 12.2018
- Planning and managing IT operations
- Managing, auditing and maintaining systems and network infrastructure, including data center hardware
- Managing WDS (Windows Deployment Services) through Microsoft System Center
- Managing Active Directory and ensuring its continuity
- Building and managing a pfSense proxy infrastructure for access to IoT MP devices
- Configuring static routes on RRAS for communication between the corporate and IoT networks
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System Support Specialist
Astron Yaşar Holding · 11.2012 – 07.2016
- Managing, auditing and maintaining server and network infrastructure, including the data center and disaster recovery center
- Planning, installing and commissioning new server systems; inventory management
- Managing redundant power infrastructure in the data center and disaster recovery center
- Planning and running monthly/yearly backup cycles with HP Data Protector
- Microsoft RDSH and Connection Broker infrastructure for the group's companies; load balancing and failover
- Centralized management and backup of user profile data with Folder Redirection
- Managing DHCP, print server and Active Directory infrastructure
- L3 network segmentation with VLAN configurations
- Managing VMware vCenter, HA and DRS; data redundancy on NetApp storage systems
- Managing pfSense proxy infrastructure
- Writing and continuously improving IT operations procedures
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System Support Specialist
Plus Bilgisayar · 08.2009 – 04.2012
- System and network support for mid-sized companies in the Aegean region
- Planning, installing and commissioning server and infrastructure projects for corporate customers
- Maintenance and troubleshooting of network and server hardware
- Analysis and fast resolution of critical failures; managing concurrent projects and support across different customer environments
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System Support Specialist
City Bilişim Hizmetleri · 02.2005 – 07.2009
- System and network infrastructure services for companies in İzmir
- Installing, configuring and commissioning server and network infrastructure for small and medium-sized businesses
- Maintenance and repair of network and server hardware
- Installing and configuring Windows operating systems and business applications
- On-site support, remote access and rapid response