Technical Support Engineer / Linux Systems Administrator (L2/L3) at TechBiz Global GmbH

TechBiz Global GmbH; Lublin; On-site; PLN 70,000 - 110,000; Full time

Benefits offered by this job

On-site in Lublin

Job summary

TechBiz Global GmbH in Lublin is seeking a seasoned Linux/hosting engineer to manage Linux systems, virtualization, and hosting stacks in a full-time on-site role.

You will deploy and support cPanel/WHM, Plesk, and WordPress/Laravel apps, while securing infrastructure with firewalls and WAFs. Collaboration with developers and clients is essential for reliable service delivery.

Qualifications

• Several years of hands-on experience in web hosting and system administration.
• Advanced proficiency in Linux administration and troubleshooting.
• Familiarity with Windows Server environments (IIS, MSSQL) for cross-platform support.

Responsibilities

• Administer and maintain GNU/Linux systems and virtualized/containerized environments.
• Deploy, manage, and troubleshoot hosting panels (cPanel/WHM, Plesk) in shared hosting.
• Troubleshoot PHP-based apps (WordPress, Laravel) and related Node.js/Python stacks.
• Configure/maintain network protocols, firewalls, and WAFs; handle security incidents.
• Troubleshoot mail flow with Exim/Dovecot, SPF, DKIM, DMARC and relays.
• Tune performance for Apache, Nginx, LiteSpeed and MySQL/MariaDB databases.
• Support migrations of hosting accounts, VMs, and mail systems; assist DR/backups.

Skills

Linux admin

Virtualization

cPanel/WHM

WordPress/Laravel

PHP debugging

Node.js/Python

Security hardening

Firewall/WAF

Mail server

MySQL/MariaDB

Ansible scripting

WHMCS integration

Networking TCP/IP

English communication

Tools

Docker

KVM

Apache

Nginx

LiteSpeed

OpenVZ

Plesk

Windows Server

Job description

This Full time on site position offers great opportunities for career growth. Position located in Lublin, LL, PL.

Key Responsibilities

• Infrastructure Collaboration: Work within the technical team to administer and maintain GNU/Linux operating systems and virtualized/containerized environments (OpenVZ, KVM, Docker, etc).
• Web Hosting Operations: Participate in the deployment, management, and troubleshooting of industry-standard control panels (like cPanel/WHM, Plesk) within shared hosting environments.
• Application & Web Stack Support: Troubleshoot and optimize web applications built on common web technologies, frameworks and CMS platforms (WordPress, Laravel, etc.). Assist clients and resolve complex issues related to PHP, with knowledge of Node.js and Python stacks considered a strong plus.
• Network & Security Operations: Help configure and maintain network protocols, firewalls, and WAFs (ModSecurity, Imunify360). Work with the team to identify, respond to, and mitigate security incidents (malware, phishing, DoS, etc.).
• Mail Server Administration: Troubleshoot mail flow and deliverability issues, you are already familiar with Exim, Dovecot, SPF, DKIM, DMARC, and the use of external mail relays.
• Performance & DevOps: Contribute to routine service monitoring and execute performance tuning across Apache, Nginx, LiteSpeed, and database engines (mainly MySQL/MariaDB, and rarely PostgreSQL and Redis).
• Reliability & Migrations: Support infrastructure projects, including migration of hosting accounts, VMs, and mail systems. Assist in testing and implementing disaster recovery, backups, failovers, and caching/CDN strategies.

Required Qualifications

• Experience: Several years of hands-on experience in the web hosting industry in both technical support and system administration.
• OS Mastery: Advanced proficiency in Linux system administration and troubleshooting.
• Familiarity with Windows Server environments (including IIS, MSSQL) for cross-platform support cases.
• Hosting Stacks: Deep understanding of the cPanel/WHM ecosystem, CloudLinux (LVE, CageFS, Selectors), PHP configuration, and typical shared hosting constraints and workarounds.
• In addition to proven expertise configuring, managing, and troubleshooting HTTP web servers (Apache, Nginx, LiteSpeed, etc.).
• Web Technologies: Strong grasp of web server mechanics, relational/NoSQL databases, and the ability to debug complex web apps at the server level.
• Networking Fundamentals: Solid understanding of TCP/IP, DNS, and network protocols.
• Communication: Strong ability to manage escalated support tickets and collaborate with peers to provide custom technical solutions for clients.
• Nice-to-Have Automation & Scripting: Proficiency in writing Bash scripts, Python utilities, and utilizing Ansible playbooks to help the team automate routine deployments and maintenance tasks.
• Billing & Integration: Experience with WHMCS backend architecture and custom module integrations.
• Hardware & Architecture: Familiarity with high-density enterprise server architectures and large-scale account consolidation workflows.
• Multilingual Support: Professional fluency in English is highly advantageous for internal documentation and diverse client communication.