Architect & Consultant & IT Security Consultant & Linux Administrator & Network Administrator

An experienced IT professional with expertise in Unix/Linux-based systems, OpenSource solutions, and networking/security technologies. Currently running a sole proprietorship, managing projects like Intrabook and Document Management System. Skilled in technologies like Apache, Postfix, Dovecot, OwnCloud/NextCloud, OnlyOffice, Collabora Online, SeedDMS, BitWarden, FreeRadius, Zabbix, and more. Holds a degree from the Faculty of Electrical Engineering and Informatics. Proficient in English, with intermediate proficiency in German and Russian. Extensive previous experience includes roles covering areas such as project management, product development, IT solutions, and network security.

2015 - Present Freelance Business Owner

• Currently involved in minimal projects, allowing engagement in additional endeavors.

Current Projects:

Intrabook: Information and Communication Center

• Operations and development of a customized solution based on WordPress/PHP.
• Integration and customization of multiple plugin modules, utilizing Bash and PHP scripts.
• Cloud-based system running on Debian Linux server with technologies such as Apache, Postfix, Dovecot, PHP, MySQL.

Document Management System and Private Cloud

• Maintenance and operation of Debian Linux server with open-source applications (SeedDMS, NextCloud, OnlyOffice, Collabora Online).
• Private infrastructure deployment for customer collaboration.

Cloud Infrastructure and Security Solutions

• Platform for testing, development, and demonstration purposes.
• Utilization of technologies like OPNSense firewall, SoftEther VPN, NextCloud, Bitwarden password manager, and Zabbix monitoring.
• Implementation of secure communication using SoftEther and OpenVPN.

Professional Expertise:

• Proficient in Unix/Linux systems (Debian, Ubuntu, OpenWrt, FreeBSD) - installation, configuration, administration, troubleshooting, maintenance.
• Integration and administration of open-source solutions: Apache, Postfix, Dovecot, OwnCloud/NextCloud, OnlyOffice, Collabora Online, SeedDMS, BitWarden, FreeRadius, Zabbix, etc.
• Networking, firewalling, VPN, and IT/Cybersecurity solutions, with a preference for open-source technologies like OpenVPN, SoftEther VPN, OPNSense firewall.
• Internal and external security testing of IT infrastructure and web applications, including penetration testing using Kali Linux tools (Metasploit, Nmap, Wireshark, etc.).
• WordPress development, plugin integration, customization of PHP, HTML, CSS, and JavaScript code, with a focus on web security.
• Past experience with networking/security technologies from Cisco, Motorola, Symantec, and others.

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Previous Work Experience

2014-2015: Bratislava

• Internal project management for "Customer Lifecycle."
• Innovation and development of products for the residential segment.

1995-2014: Bratislava

• IT solutions, LAN and WAN networking, network security.
• Experience with various technologies: Windows, Novell, Linux, X.25, Frame Relay, ADSL, Cisco, Motorola, Symantec, Memotec, Juniper.
• Co-led the company, focusing on technical aspects.
• Technical realization of solutions, development, testing, project management, customer care, and product management