Hybrid IT System Manager – Linux, Network Focus

at QITS GmbH

• Job title: IT System Manager – Linux, Network Focus
• Job type: Full Time
• Experience level: Mid level, Senior
• Salary: Not specified
• Degree requirement: Bachelor's Degree
• Tech skills: Apache, DNS, Docker, Linux, MariaDB, Puppet
• Location requirements: Hybrid, Ratingen, Germany

About the role

• IT Systemmanager focusing on managing Linux infrastructure and network services in a hybrid setup. Overseeing external service providers and maintaining necessary documentation for systems and network operations.

Responsibilities

• As an IT System Manager - Focus on Linux and Network (m/f/d), your responsibilities are split: Linux Administrator (70 %) focusing on the operation, maintenance and further development of our Linux infrastructure, and Network Administrator (30 %) to manage the external service provider and implement straightforward firewall/network requirements.
• You manage services and users via the command line on Debian/Ubuntu and RHEL/Rocky Linux.
• You secure SSH access, debug SSH-related issues and resolve them.
• You manage and operate filesystems (LVM2).
• You operate Apache, MariaDB, Tomcat, Postfix, BIND and OpenSSH; configure management with Puppet; and support developers with Docker, GitLab and Git.
• You consolidate firewall rules on the Palo Alto firewall together with network service providers and configure the rules.
• You coordinate and supervise the external network service provider.
• You perform protocol analysis and network troubleshooting using tcpdump/Wireshark; administer switches in cooperation with our service provider; and create and maintain technical documentation.

Requirements

• You have completed vocational training as an IT specialist (Fachinformatiker) or hold a degree in computer science.
• You have solid Linux experience (Debian/Ubuntu, RHEL/Rocky) and ideally possess an LPIC or comparable certification.
• You have practical experience in SSH management, filesystems (LVM2) and common services (Apache, MariaDB, Tomcat, Postfix, BIND, OpenSSH).
• You are familiar with Puppet or similar configuration management tools; you are proficient with Docker, GitLab and Git from a developer’s perspective.
• You have basic knowledge of security best practices and methods for hardening Linux systems.
• You are experienced in working collaboratively with developers and external service providers.
• You have networking knowledge including IP/Routing/VPN/NAT/Load Balancing/Mail/SSH/DNS and experience with network analysis.

Benefits

• Hybrid workplace — presence at our Ratingen location (near Düsseldorf) is required 2–3 days per week.
• Weekly working hours: 37.5.
• We support your IT professional development if continuing education is important to you.
• Attractive fixed salary and 30 days of vacation per year.
• Modern IT equipment.
• Coffee, water and fruit available.
• Health offers & company events.