L2/L3 Linux Technical Support Engineer – Web Hosting at TechBiz Global GmbH

TechBiz Global GmbH; Porto; On-site; EUR 40,000 - 60,000; Full time

Job summary

TechBiz Global GmbH is seeking an experienced on-site System Administrator in Porto to join a dynamic hosting team. You will manage GNU/Linux servers, virtualization environments, and web hosting platforms, ensuring high availability and performance.

The role requires deep knowledge of cPanel/WHM, web server tuning, and mail infrastructure, with automation and cross-platform support becoming key parts of daily tasks. Fluency in English is advantageous.

Qualifications

• Several years of hands-on experience in the web hosting industry in technical support and system administration.
• Advanced proficiency in Linux system administration and troubleshooting.
• Familiarity with Windows Server environments (IIS, MSSQL) for cross-platform support.
• Deep understanding of cPanel/WHM, CloudLinux, PHP configuration and shared hosting constraints.
• Experience configuring and troubleshooting HTTP servers (Apache, Nginx, LiteSpeed).
• Strong knowledge of web technologies, databases and server debugging at the stack level.
• Solid TCP/IP, DNS and networking fundamentals.
• Excellent communication for escalated tickets and client solutions.
• Nice-to-have: Bash scripting, Python utilities and Ansible for automation.
• Experience with WHMCS backend and integrations.
• Knowledge of high-density server architectures and migration workflows.
• Fluency in English is advantageous for documentation and client communication.

Responsibilities

• Administer and maintain GNU/Linux systems and virtualized/containerized environments (OpenVZ, KVM, Docker).
• Deploy, manage, and troubleshoot control panels (cPanel/WHM, Plesk) in shared hosting.
• Troubleshoot and optimize PHP-based web apps; Node.js/Python stacks are a plus.
• Configure and maintain network firewalls and WAFs (ModSecurity, Imunify360).
• Troubleshoot mail flow; work with Exim, Dovecot, SPF/DKIM/DMARC and external relays.
• Monitor service performance; tune Apache, Nginx, LiteSpeed and databases (MySQL/MariaDB).
• Assist migrations, DR/testing, backups, failovers, and CDN strategies.

Skills

Linux administration

Windows Server

Networking fundamentals

cPanel/WHM

Plesk

Web hosting

PHP debugging

Node.js

Python

Bash scripting

Ansible

WHMCS

Security & firewalls

Mail servers (Exim, Dovecot)

Apache/Nginx/LiteSpeed

MySQL/MariaDB

Redis

Disaster recovery & backups

Multilingual support

Tools

OpenVZ

KVM

Docker

Exim

Dovecot

LiteSpeed

Job description

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

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.