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

TechBiz Global GmbH; Poznań; On-site; PLN 120,000 - 180,000; Full time

Job summary

TechBiz Global GmbH in Poznań, Poland, is seeking a Technical Support Engineer / Linux Systems Administrator (L2/L3) for an on-site role. You will join a dedicated team supporting GNU/Linux systems and hosting environments.

Responsibilities include deploying and maintaining web hosting stacks, managing cPanel/WHM and Plesk, debugging PHP-based apps, and ensuring security and performance. Proactive problem solving and strong communication are essential for success in a fast‑paced, innovative

Qualifications

• Hands-on experience with GNU/Linux system administration.
• Familiarity with cPanel/WHM and Plesk hosting stacks.
• Experience with Docker/OpenVZ and virtualization.

Responsibilities

• Administer Linux systems and hosting environments.
• Troubleshoot PHP apps and web stacks.
• Ensure security, backups, and performance tuning.

Job description

Apply for Technical Support Engineer / Linux Systems Administrator (L2/L3) at TechBiz Global GmbH in Poznań, WP, PL.

This Full time on site position offers great opportunities for career growth.

At TechBiz Global, we are providing recruitment service to our TOP clients from our portfolio. We are currently looking for a dedicated Technical Support Engineer / Linux Systems Administrator to join one of our clients' teams. If you're looking for an exciting opportunity to grow in an innovative environment, this could be the perfect fit for you.

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.