PRECISE TECH & CLEAR LANGUAGE
Linux expertise with editorial finesse
As a passionate Linux administrator with 20+ years of experience, I am looking for new challenges in an innovative team. My strength lies in combining technical expertise with clear communication.
About
Who is Sebastian Palencsar?
With 20+ years of Linux experience and 4+ years as a system administrator, I bring deep system administration expertise and strong technical documentation skills.
My career blends deep technical expertise with an entrepreneurial mindset. After seven years as an IT entrepreneur, I have been working for four years as a Linux system administrator across different companies. My strengths are hands‑on experience, telecom know‑how, and current IT certifications.
What sets me apart: I don’t just operate complex systems, I document them clearly. This mix of technical depth and communication skills makes me a team player who connects IT departments with other areas.
The best documentation is the one nobody needs because the system is self‑explanatory.
$ uptime
status: nominal
last deploy: successfulMy competencies
Technical competencies & skills
Over 15 years of hands-on experience across diverse IT environments have shaped my technical skills.
Linux administration
Slovak Telekom: RHEL administration, kernel updates
Ferchau: third-level support for Linux infrastructures
- Ubuntu/RHEL server administration
- Crash analysis (dmesg/journalctl)
- Server migrations (physical → virtual)
Virtualization & containers
Proxmox VE: VM container orchestration
Docker Foundations Professional Certificate (May 2025)
- Proxmox VE management & optimization
- Docker container orchestration
- Coordination of complex migrations
Web servers & services
Professional configuration and operation of web and mail services.
- Apache & NGINX configuration
- SSL/TLS & security hardening
- Mail servers (Postfix/Dovecot)
Databases & storage
Solid experience in database administration and storage management.
- MySQL/MariaDB administration
- PostgreSQL fundamentals
- Backup strategies & recovery
Security & monitoring
Ferchau: GDPR/BDSG-compliant data protection policies
CompTIA Security+ & cybersecurity certifications
- IAM recertification & disaster recovery
- Intel AMT implementation for remote maintenance
- Security hardening & patch management
Documentation & automation
Technical writer: multimedia content & online help
Ansible fundamentals & workflow optimization for teams
- Root-cause analyses documented
- Ansible fundamentals for automation
- Shell scripting & process optimization
Interested in my competencies?
I bring these skills into your team. Feel free to contact me for a no‑obligation conversation about your needs.
Experience
My career at a glance
A snapshot of my professional journey across different areas of the IT world.
Linux system administrator
Various clients | Remote
Configuration and maintenance of Linux servers (Ubuntu, RHEL). Administration of Proxmox virtualization environments and creation of technical documentation.
IT administration / security compliance
Ferchau GmbH | Remote
Security compliance project: creation of audit and policy documents (GDPR/BDSG), development of IT security and business continuity concepts.
Linux system engineer
Slovak Telekom Group | Remote
Red Hat Enterprise Linux administration in production. Kernel updates, patch management, crash analysis, and server migrations.
Application support specialist
EDEKA Nord GmbH | Hybrid
Support of fleet management software and technical support. Ensuring security policies and conducting trainings.
Technical writer
Freelance | Malchow, Germany
Concept and creation of technical documents, development of multimedia content and online help for different audiences.
IT entrepreneur
Self-employed | Berlin, Budapest, Vienna
Freelance IT work specializing in IT documentation and technical communication. Team leadership of up to 10 staff.
My skills
Technical know-how & skills
Core competencies
Focus areas where I am especially strong.
Operating systems
Servers & virtualization
Web Services & Tools
Communication & content
Additional skills
Monitoring & observability
Automation & scripting
Networking & security
Bastion & secure access
GitHub profile
Experience at a glance
Control panels
My strengths
Why I am the right candidate
I work in a structured, reliable, and solution-oriented way. I quickly get new or unexpected situations under control without losing focus. I take initiative, work carefully and goal-driven, and consistently deliver clean results.
Technical quality and clear documentation are part of good work for me. Systems should run stable, be built transparently, and be operated securely. I work thoroughly rather than short-term, while keeping the practical side in view.
I communicate openly, calmly, and respectfully. Collaboration should be straightforward—with colleagues, clients, and partners. A helpful, professional attitude matters to me as much as reliable delivery and predictable work, especially in remote environments.
experience
certifications
training
leadership
Enterprise Linux expertise
Slovak Telekom: RHEL server administration, kernel updates, server migrations
Ferchau: third-level support for Linux infrastructures and Intel AMT implementation
Leadership experience
As managing director of psixMedia UG, led up to 10 team members. Experience in people management, strategic decisions, and process optimization.
Troubleshooting expertise
Crash analysis via dmesg/journalctl, root-cause analysis, and disaster recovery plans. Implemented workflow optimizations for maintenance teams.
Security & compliance
Implemented GDPR/BDSG-compliant data protection policies, performed IAM recertification. CompTIA Security+ and cybersecurity certifications.
Documentation professional
Technical writer (2021-2022): multimedia content, online help, and audience-focused documentation.
Continuous learning
206+ learning hours in 2023-2025: Azure Fundamentals, Windows Server, CompTIA Security+, Docker Foundations Professional, Ansible basics, Vagrant basics, network analysis with Wireshark.
Verified work samples
You can experience my expertise directly in practice
Technical documentation
My own IT documentation wiki with Linux tutorials, how-tos, and troubleshooting guides
View admindocs.deOpen source projects
Automation scripts for NAS setup and macOS system maintenance
View GitHub profileMy motivation
As an experienced Linux administrator with strong communication skills, I bring technical expertise and team spirit to every project. My goal is to optimize your IT infrastructure while sharing knowledge.
Education
Continuous learning & growth
Focus on official certifications with final exams from recognized providers like Canonical, Docker, and Microsoft - all delivered via LinkedIn Learning. These credentials demonstrate verified skills through passed exams.
Official certifications with exams
Ubuntu Linux Professional
Canonical & LinkedIn Learning
- Ubuntu system administration
- Storage management & LVM
- Shell scripting & CLI
Docker Foundations Professional
Docker Inc. & LinkedIn Learning
- Container management
- Docker Compose
- Best practices
Core system administration competencies
Microsoft & LinkedIn Learning
- Server management
- Automation
- System monitoring
Penetration Testing Professional
Cybrary
- Penetration testing
- Vulnerability assessment
- Ethical hacking
Network Automation Professional
Arista Networks
- Network automation
- Arista CloudVision
- Infrastructure as code
Python Programming Certificate
National Association of State Boards of Accountancy (NASBA)
- Python fundamentals
- Scripting & automation
- Data processing
Additional training & courses
Linux/LPIC courses
- • LPIC-1 (101-500 & 102-500)
- • Linux Foundation Certified Engineer (LFCE) - June 2025
- • Shell scripting & fundamentals
- • System services & security
- • Administrative tasks
Security courses
- • CompTIA Security+ (SY0-601)
- • IT security specialist
- • Kali Linux for pentesters
- • Computer forensics
Cloud/AWS courses
- • AWS Cloud Practitioner Core
- • AWS security fundamentals
- • Cloud migration
- • Hybrid solutions
Automation courses
- • Ansible fundamentals
- • Vagrant fundamentals
- • Container orchestration
- • Docker Compose & Swarm
Networking/forensics
- • Network analysis with Wireshark
- • Computer forensics
- • Microsoft Copilot Security
- • Wi-Fi security
DB/monitoring
- • MySQL/PostgreSQL admin
- • System monitoring tools
- • ELK stack fundamentals
- • Performance tuning
Continuous learning
My projects
Open source projects & tools
Explore my open-source projects and tools that demonstrate my hands-on skills in Linux administration and automation.
Linux Command Dev
Interactive platform for Linux commands and tutorials. Reference for Unix and Linux commands with terminal examples for all major distributions.
Ansible LEMP WordPress
Automated WordPress installation with LEMP stack (Linux, Nginx, MySQL, PHP) via Ansible playbooks.
NAS Server Automation
Automated setup script for NAS systems with multi-distribution support and service configuration.
My work environment
Where I can do my best work
These environments bring out the best in me and allow me to fully apply my skills.
Team environment
- Collaborative teamwork
- Open communication
- Knowledge sharing
- Flexible working hours
- Remote options
Technologies
- Linux systems (RHEL, Ubuntu)
- Virtualization (KVM, Proxmox)
- System monitoring
- Backup & recovery
- Shell scripting
Growth
- Learning opportunities
- Interesting projects
- Mentoring & exchange
- Ownership
- Creative approaches
My vision
My career vision
As an experienced Linux administrator with 20 years of professional experience and 4+ years as a system administrator, I am looking for a team where I can contribute my passion for stable systems and clear documentation. My vision is to work in a company that combines innovation with reliability and provides room for continuous learning. I want to be part of a team that not only solves technical challenges, but also shares knowledge and grows together. Specifically, I am looking for opportunities to apply my expertise in automation and technical communication to create sustainable solutions.
Contact
Let’s talk
Linux administrator for your team?
With 20+ years of Linux experience and 4+ years as a system administrator, I bring strong expertise in system administration, virtualization, and automation. I’d be happy to discuss how I can strengthen your team in a no‑obligation conversation.
Contact & imprint
Information pursuant to § 5 DDG
Sebastian Palencsár
Linux administrator
Bahnhofstraße 8
17213 Malchow
Contact
Email: hello@palencsar.pro – contact form available.
Social media
Other projects
Email service
For email communication I use Zoho Mail, hosted on EU servers in Amsterdam. The service provides strong data security and privacy standards with end‑to‑end transport encryption:
End‑to‑end encryption (OpenPGP)
For confidential communication, you can encrypt emails with my public OpenPGP key.
Trust & transparency
The email service is operated in GDPR compliance on EU servers (Amsterdam). No data processing occurs outside the EU.
Legal notice
Copyright & design
© 2026 Sebastian Palencsár. All rights reserved. This website serves as an online portfolio for my job search as a Linux administrator. The content, works, design of this website, and all graphical elements are protected under German copyright law.
The layout, graphics, images, code, and all other content are copyrighted and owned by Sebastian Palencsár or appropriately licensed.
Reproduction or use of these elements without explicit permission is not permitted.
Privacy
This website is a pure online portfolio for job search and does not collect personal data for analytics. No tracking tools are used and no external CDN services are embedded. For the contact form, a temporary PHP session may be used Session cookie:PHPSESSID solely to protect against abuse (CSRF) and is not stored permanently. The web server processes no user data—access logs are disabled OpenResty:access_log off and error logs are only created for critical system errors without storing IP addresses.
Protecting your personal data is my highest priority. Applications are handled confidentially.
Disclaimer
The contents of our pages were created with great care. However, we cannot guarantee accuracy, completeness, or timeliness.
Despite careful content control, we accept no liability for external links. The operators of linked pages are solely responsible for their content.
Frameworks & tools used
This website uses the following frameworks and libraries among others:
These tools are used in accordance with their respective licenses.
External links
This website contains links to external third-party websites. These links are marked as such. We have no influence over the content of these websites. The respective provider or operator is responsible for the content of the linked pages.
Contact
Send me a message
Contact form
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