Berlin-based IT professional

IT SYSTEM ADMINISTRATION · SUPPORT · SECURITY

IT systems. Reliable support. Practical security.

IT System Administrator with professional experience in IT administration, infrastructure, first- and second-level support, networking, databases and web systems.

Practically trained in Windows Server, Linux, Active Directory, virtualization, Microsoft Azure, infrastructure monitoring and security-event analysis.

View Projects Download CV Contact Me
Focus Systems · Support · Security
Languages DE · EN · FR · ES
TECHNICAL PROFILE

Infrastructure Stack

ACTIVE
01
Systems Administration

Windows Server · Linux · Active Directory · GPO

02
Network Infrastructure

TCP/IP · VLAN · DNS · DHCP · Routing · VPN

03
Cloud & Virtualization

Microsoft Azure · VMware · Hyper-V · Docker

04
Monitoring & Security

Wazuh · Security Onion · Prometheus · Grafana

Enterprise SOC Laboratory View live project
CORE STACK
Windows Server Active Directory Linux VMware Azure Wazuh Security Onion Prometheus Grafana
01 PROFESSIONAL PROFILE

Technical experience backed by practical implementation.

Professional IT experience combined with current hands-on work in system administration, infrastructure, monitoring and security.

I am an IT System Administrator with experience in IT administration, infrastructure support, database systems and web development.

My technical background covers Windows and Linux administration, Active Directory, networking, virtualization, Microsoft Azure, monitoring and security-event analysis.

Through my enterprise home laboratory, I have implemented and documented domain services, segmented virtual networks, Windows and Linux endpoints, monitoring platforms and controlled security-detection scenarios.

HOW I WORK
Identify Reproduce Diagnose Resolve Test Document
01

Experience

IT administration, technical support, databases and web-based systems.

02

Infrastructure

Windows Server, Linux, networking, virtualization and cloud fundamentals.

03

Security

SIEM monitoring, log analysis, attack simulation and detection investigation.

04

Support

Structured troubleshooting, user assistance, testing and technical documentation.

02 CORE EXPERTISE

Technologies applied to real infrastructure tasks.

From endpoint support and server administration to networking, monitoring and security analysis.

01 SYS

Systems Administration

Administration of Windows and Linux systems, identities, permissions and essential infrastructure services.

  • Windows Server 2025
  • Windows 10 and 11
  • Active Directory
  • DNS, DHCP and Group Policy
  • Ubuntu, Kali and CentOS
  • User and permission management
CORE DISCIPLINE ACTIVE
02 OPS

IT Support & Operations

Structured troubleshooting focused on restoring services, supporting users and documenting lasting solutions.

  • First- and second-level support
  • Hardware troubleshooting
  • Software troubleshooting
  • Incident analysis
  • System maintenance
  • Technical documentation
SERVICE DELIVERY ACTIVE
03 NET

Networking

Configuration, analysis and troubleshooting of physical and virtual network environments.

  • TCP/IP and subnetting
  • LAN, WAN and VLAN concepts
  • Routing and switching
  • DNS and DHCP troubleshooting
  • VPN fundamentals
  • CCST and CCNA topics
CONNECTIVITY ACTIVE
04 CLD

Cloud & Virtualization

Reproducible virtual environments for administration, monitoring, testing and security analysis.

  • Microsoft Azure
  • Azure Fundamentals
  • VMware Workstation
  • Microsoft Hyper-V
  • VirtualBox
  • Docker fundamentals
PLATFORMS ACTIVE
05 SOC

Monitoring & Security

Infrastructure visibility, event collection, alert investigation and controlled security testing.

  • Wazuh SIEM
  • Security Onion
  • Prometheus and Grafana
  • Nagios monitoring
  • Log and alert analysis
  • MITRE ATT&CK mapping
DETECTION ACTIVE
06 DEV

Databases, Scripting & Web

Supporting infrastructure through database systems, scripting, web administration and code-based customization.

  • SQL Server, MySQL and PostgreSQL
  • MongoDB
  • PowerShell and Bash fundamentals
  • Git and deployment workflows
  • WordPress and WPBakery
  • HTML, CSS, JavaScript and PHP
DEVELOPMENT ACTIVE

Competence is demonstrated through documented projects, working configurations and troubleshooting evidence—not arbitrary percentages.

Explore project evidence
03 FEATURED PROJECTS

Practical work. Documented results.

Selected projects demonstrating infrastructure administration, monitoring, security analysis, troubleshooting and technical documentation.

FLAGSHIP PROJECT 01 / SECURITY & INFRASTRUCTURE

Enterprise SOC Laboratory

A segmented virtual enterprise environment integrating Windows, Linux, monitoring platforms and security-detection technologies.

The laboratory demonstrates how infrastructure services, endpoints, monitoring systems and security platforms can be deployed, connected, tested and documented within a personally controlled VMware environment.

06 Integrated systems
04 Monitoring platforms
03 Detection scenarios
View Live Documentation View Case Study
LAB ARCHITECTURE Enterprise Detection Environment
ONLINE
SOC NETWORK · 192.168.117.0/24
SO
Security Onion 192.168.117.10
WZ
Wazuh 192.168.117.50
DC
Windows Server 192.168.117.130
W11
Windows 11 192.168.117.100
MONITORING & TESTING
UB
Ubuntu Monitor Prometheus · Grafana · Nagios
KL
Kali Linux Controlled security testing
Detected activities
Nmap Hydra Gobuster
02
Infrastructure Windows
AD DNS DHCP GPO

Windows Server Enterprise Administration

Active Directory, organisational units, users, security groups, Group Policy, DNS, DHCP and Windows 11 domain integration.

  • Domain controller deployment
  • Identity and permission management
  • File sharing and policy configuration
View project
03
Monitoring Operations
PR GF NG EXP

Multi-Platform Infrastructure Monitoring

Central monitoring of Windows and Linux systems using Prometheus, Grafana, exporters and Nagios availability checks.

  • Windows and Node Exporters
  • Prometheus target configuration
  • Grafana dashboards and service checks
View project
04
WordPress Web Operations
WP PHP CSS DB

WordPress Platform Administration

Technical administration and development of a responsive sports academy platform using WordPress and WPBakery.

  • Migration and child-theme customization
  • PHP template and mobile-navigation repair
  • Performance and image optimization
View project

All security testing was conducted in an isolated, personally controlled laboratory environment.

View all projects
04 CAREER & EDUCATION

Experience developed across systems and countries.

A professional path connecting IT support, infrastructure, database administration, software development and continued technical education.

01

Professional experience

EUROPE
09/2018–06/2019 Berlin, Germany

IT Administration

Afrolink

  • IT infrastructure and network administration
  • First- and second-level user support
  • Hardware and software troubleshooting
  • System monitoring and technical documentation
IT Support Infrastructure Troubleshooting
10/2014–09/2018 Denmark

Software & Web Developer

Sagnalandet Lejre

  • Conversion of a Java desktop system into a web solution
  • Development and administration of relational databases
  • Database normalization and data-structure improvement
  • Maintenance of internal digital systems
Web Development Java SQL
08/2004–06/2010 Lleida, Spain

IT Support & Database Administrator

Proflex SL

  • Microsoft SQL Server configuration and administration
  • Implementation of personal database solutions
  • Helpdesk and general technical support
  • Troubleshooting of user and system issues
SQL Server Helpdesk Database Administration

Full employment and education details are available in my CV.

Download CV
05 CERTIFICATIONS & CREDENTIALS

Formal learning supporting practical capability.

Education and technical credentials covering system administration, cloud services, networking, computer science and web development.

SYS COMPLETED
PROFESSIONAL TRAINING

IT System Administration

Zukunftsmotor GmbH · Berlin

Practical training in Windows Server, Linux, networking, virtualization, monitoring, security and IT support.

Windows Server Linux Networking Security
View credential
AZ CERTIFIED
MICROSOFT CERTIFICATION

Microsoft Azure Fundamentals

Microsoft · AZ-900

Foundational understanding of cloud concepts, Azure services, security, governance, pricing and support.

Azure Cloud Governance Security
View credential
CS CERTIFIED
CISCO CERTIFICATION

Cisco Certified Support Technician

Cisco · CCST

Networking fundamentals, IP addressing, connectivity, troubleshooting and basic network-security concepts.

TCP/IP Routing Switching Support
View credential
BSc COMPLETED
HIGHER EDUCATION

Bachelor in Web Development

Roskilde ZIBAT · Denmark

Application development, web technologies, database systems, software architecture and technical project work.

Web Databases Development Projects
View credential
Credential documents available

Privacy-safe certificate previews and verification links will be added before the portfolio is published.

Request further information
06 CONTACT

Let’s build and support reliable IT environments.

I am open to opportunities in IT system administration, IT support, infrastructure operations and technical service environments in Berlin.

If my background matches your organisation’s requirements, please contact me to discuss the role, technical environment and next steps.

Contact Me Download English CV Download German CV
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© Vincent Sambang Njuen · IT System Administration & Support

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