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sergius ungureanu

@sergiusungureanu

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Senior Virtualization Administrator with 15+ years designing and optimizing virtual infrastructures.

Romania

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What I'm looking for

I am looking for a senior role where I can lead virtualization and infrastructure projects, drive automation and reliability, mentor engineers, and work in a structured, high-availability-focused environment.

I am a Senior Virtualization Administrator with over 15 years of experience designing, managing, and optimizing large-scale virtualized environments for banking, finance, government, and IT clients. I specialize in Citrix XenServer and VMware ESXi and have consistently delivered high-availability, scalable infrastructure solutions.

I have led technical teams, mentoring more than 10 junior administrators, and driven operational improvements through automation—creating over 50 custom Bash and PowerShell scripts that reduced costs and manual workload. My hands-on background includes performance tuning, storage integration, P2V/V2V migrations, and disaster recovery planning.

I seek to bring deep technical knowledge and leadership to a senior role where I can continue to improve reliability and efficiency, implement proactive solutions, and contribute to the professional growth of engineering teams.

Experience

Work history, roles, and key accomplishments

Senior Virtualization Administrator

Atos IT Solutions and Services

Apr 2014 - Jul 2025 (11 years 3 months)

Designed and managed Citrix XenServer environments across 600+ physical hosts, automated operations with 50+ Bash/PowerShell scripts to reduce costs, and led a team of 10+ administrators to improve reliability and minimize downtime.

XenServer VMware ESXi BASH PowerShell High Availability Automation)Team Leadership

System Administrator

OSF Global Services

Apr 2012 - Mar 2014 (1 year 11 months)

Managed and optimized VMware ESX/vSphere virtualization and cloud integration, streamlined administration via PowerShell and Bash scripting, and supported Windows and Linux servers for business-critical applications.

VSPhere PowerShell BASH Linux Windows Server Virtualization

System Administrator

DecSoft SRL

Jun 2011 - Oct 2011 (4 months)

Installed, configured, and maintained VMware virtual machines and servers, developed automation scripts to improve maintenance efficiency and system performance.

VMWare Shell Scripting System Administration Virtualization Performance Tuning Linux Windows

System Administrator

Sinoptix SRL

Jul 2009 - Jun 2011 (1 year 11 months)

Led administration of Linux and Windows servers with focus on virtualization, backups, and network security, and managed development tools including GIT and SVN to support engineering teams.

Linux Windows Server Virtualization Backup Network Security Git SVN Developer Tools

IT Department Assistant

Metro Cash & Carry Romania SRL

Mar 2007 - Feb 2009 (1 year 11 months)

Provided IT support including Oracle SQL scripting, Active Directory management, and network maintenance to ensure continuous operation of business systems.

Oracle Active Directory Maintenance IT Support Windows Server Troubleshooting

Education

Degrees, certifications, and relevant coursework

Transilvania University of Brașov

Electrical Engineering and Computer Science

2002 - 2007

Completed studies in Electrical Engineering and Computer Science from 2002 to 2007, focusing on systems and infrastructure relevant to virtualization and IT administration.