Adrian-Emanuel Dumitru
System/Network Administrator
Piteşti
Summary
System Administrator with a background in electronic systems engineering and a Master’s in security technologies. Passionate about maintaining stable, secure IT infrastructures and solving technical challenges hands-on. Experienced in managing Windows and Linux environments, Active Directory, VMware, and server infrastructure. Skilled in software deployment, user and system administration, and backup/restore operations using Acronis. Comfortable working in both standalone and enterprise IT setups, with a strong focus on reliability, clarity, and user support. Looking to contribute to international projects where secure and stable systems really matter.
Overview
7
7
years of professional experience
3
3
Certifications
2
2
Languages
Work History
System Administrator
Ministry of Defence
08.2018 - Current
- Administer and maintain Windows Server and Linux (Ubuntu, RHEL) environments for internal military infrastructure
- Manage user accounts, groups, and policies via Active Directory to ensure secure access and role-based permissions
- Provide daily technical support to military personnel (Tier 1–2), including troubleshooting, hardware/software assistance, and user training
- Oversee software deployment and updates across multiple workstations using standard OS imaging and configuration tools
- Perform scheduled system backups and recovery using Acronis Backup & Restore to ensure data integrity and business continuity
- Manage Microsoft Exchange Server for email services, including mailbox setup, troubleshooting Outlook issues, and ensuring smooth integration
- Maintain and monitor virtual infrastructure using VMware vSphere / ESXi, including VM provisioning and performance tuning
- Installed important security and functionality patches to maintain optimal protections against intrusion and system reliability.
- Improved security measures by conducting vulnerability assessments and applying necessary patches.
- Managed user access rights to maintain a high level of information security while ensuring appropriate levels of accessibility for authorized personnel.
- Increased efficiency in the workplace by ensuring seamless integration of new applications into existing systems.
- Diagnosed and resolved complex technical issues through in-depth analysis, facilitating uninterrupted business operations.
- Enhanced system performance by optimizing server configurations and implementing regular updates.
- Completed reports detailing network and systems performance and downtime issues.
- Provisioned new software and hardware for use, following established security policies.
- Maintained a high level of customer satisfaction by providing rapid, accurate response to inquiries and concerns regarding system performance or functionality.
- Optimized hardware utilization, conducting detailed assessments and reallocating resources for better performance.
- Streamlined network operations, significantly reducing downtime by implementing robust monitoring tools.
- Increased user satisfaction by promptly resolving technical issues and maintaining open lines of communication.
- Diagnosed and resolved hardware and software issues.
- Monitored networks and network devices to resolve technical problems quickly (Nagios, Zabbix).
- Diagnosed and executed resolution for network and server issues.
- Planned and implemented upgrades to system hardware and software.
- Identified and resolved network congestion issues and bottlenecks.
- Researched and recommended new technologies and strategies for improving system performance.
- Evaluated software products to determine compatibility with existing systems.
- Analyzed network traffic and performance metrics to optimize system performance.
Education
M.D. - Electronic Systems And Security Engineering
Military Technical Academy "Ferdinand I"
Bucharest, Romania 04.2001 -
Bachelor’s Degree - Electronics And Telecommunications Engineering
Military Technical Academy "Ferdinand I"
Bucharest, Romania 04.2001 -
High School Diploma -
Military Highschool "Dimitrie Cantemir"
Breaza, Romania 04.2001 -
Skills
System monitoring (Nagios, Zabbix))
Network troubleshooting
Hardware and software installation
Windows Server administration
Server maintenance
VMware vSphere / ESXi
Technical support
Backup management (Acronis)
Linux Administration (CentOS, Rocky linux)
Active Directory management
Network services (DHCP, DNS)
Group policy administration
Microsoft Exchange Server (Outlook Integration)
Microsoft Office / Outlook Support
Additional Information
NATO Secret Clearance
Certification
Cisco CCNA
Timeline
Cyber Operations (Cyber Ops)
05-2024
Linux I, II (Netacad)
02-2023
Cisco CCNA
10-2022
System Administrator
Ministry of Defence
08.2018 - Current
M.D. - Electronic Systems And Security Engineering
Military Technical Academy "Ferdinand I"
04.2001 -
Bachelor’s Degree - Electronics And Telecommunications Engineering
Military Technical Academy "Ferdinand I"
04.2001 -
High School Diploma -
Military Highschool "Dimitrie Cantemir"
04.2001 -
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