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System Engineer – Linux (f/m/d)

GMX, WEB.DE & mail.com
IT System Administration
Karlsruhe, Munich
Full-time
M-309

About GMX, WEB.DE & mail.com

With our strong brands GMX, WEB.DE and mail.com and over 42 million active users, we are the leading email and communications platform in Germany, Austria and Switzerland. From this strong market position, services and apps are developed that simplify users' digital lives - from office tools and cloud solutions to personal ID management.

To the company page
United Internet Office Building

Tasks

Are you passionate about Linux systems, automation, and scalable infrastructure? As a System Engineer, you’ll help shape the backbone of one of Europe’s largest email platforms—serving over 42 million users across WEB.DE, GMX, and mail.com. Join a team that’s building a European alternative to email and cloud services, committed to privacy, digital sovereignty, and operating under European law.

Do you enjoy working with Linux and modern automation tools? Are you excited by the idea of building reliable infrastructure that powers millions of users? Want to contribute to a high-performance environment with a real impact?

  • You build and manage Linux servers (primarily Debian) on bare-metal and virtualized platforms.
  • You operate core infrastructure services such as DNS, DHCP, PXE boot, and proxy systems.
  • You automate infrastructure tasks using tools like Ansible and Puppet.
  • You develop and maintain scripts in Python, Bash, or similar languages.
  • You enhance monitoring and logging systems using tools like Prometheus, Grafana, and ELK.

Qualifications

Do you have a degree in Computer Science, IT, or equivalent practical experience? Are you confident in Linux system administration and passionate about automation and clean infrastructure? Do you thrive in collaborative, agile environments? We believe the following skills and experiences will help you to be successful in this role:

  • Solid experience in Linux system administration and infrastructure operations.
  • Proficiency in automation and configuration management tools (Ansible and Puppet).
  • Strong scripting skills in Python, Bash, or similar languages.
  • Familiarity with core infrastructure services such as DNS, DHCP, PXE, and proxies.
  • A proactive, team-oriented mindset and a passion for building reliable, scalable systems.

Benefits that make a difference

As an employer, United Internet offers interesting roles with exciting projects, personalized development opportunities and excellent career prospects.

Culture

Our working environment is characterized by flat hierarchies and short decision-making processes. We encourage a positive approach to learning from mistakes and open feedback!

Mobility

To support sustainable and flexible mobility, we provide our employees with attractive benefits packages. For example, through JobRad, you can lease your ideal bike on attractive terms. We also provide a financial subsidy for this offer. Alternatively, you can use public transport and benefit from a subsidy towards the Deutschlandticket.

Events

We celebrate our successes as a team: at United Internet, we throw legendary parties. And our varied workshops and team events foster a special sense of camaraderie.

Flexible Working

Many of our roles allow for remote working from home and flexible working hours.

Pension and health

Our employees benefit from attractive pension schemes. These include modern financial security options that support wealth accumulation. Our health and fitness programmes, covering topics such as ergonomics, exercise and nutrition, round off the package. The aim is to provide a working environment in which all colleagues can not only develop professionally but are also well-positioned for their personal future. 

Discounts

Our employees benefit from a wide range of discounts on our Group’s products and services, for example in the form of discounted broadband and mobile phone contracts. In addition, we offer exclusive price advantages for selected leisure and partner offers.

A wide range of training opportunities

Strengths are individual – and that is a good thing! Our wide range of development programmes offers excellent opportunities for personal and professional growth. From e-learnings to trainings, conferences and mentoring – we learn from, for and with one another to grow together.

Technology

To provide our employees with a productive and comfortable working environment, we rely on state-of-the-art technology. This includes high-performance hardware, ergonomic accessories and the latest software tools for efficient collaboration.

Our benefits in detail

🏢 Lived corporate culture: Flat hierarchies, a culture of respect and appreciation, signatories of the Diversity Charter, open communication and no dress code

🎓 Wide range of further training: Internal and external training opportunities, LinkedIn Learning, language courses, talent development programs, conferences and mentoring

💡 TEC-Campus: Free choice between Linux, Mac, or Windows, slack days, conferences, lecture series, courses, open-source projects, community meetups and user groups

❤️ Active health care: Wellpass, health days, family & care support services, discounts at fitness centers, mental health first responder, fresh fruit and drinks for free

🚝 Mobility: Subsidy for job bike leasing, job ticket and relocation service if you live outside Germany

💻 Flexible working models: Home office options, flexible working hours and 30 days of vacation with the option for additional unpaid leave

💰 Financial benefits: Corporate benefits, company pension scheme, capital-forming benefits, occupational disability insurance and various partner discounts

🎉 Events: Summer and winter parties, sports tournaments and team events

Join our team

United Internet offers diverse opportunities for people who want to help shape the digital future. Those who want to contribute their strengths and grow in an innovative environment will find the right place with us.

apply online now

Two colleagues in the office
WORK UNITED.
 

Diversity enriches. Different cultures, nationalities, genders, ages, sexual orientations and religions as well as people with disabilities - we value diversity and encourage it. Because only teams that reflect all facets of society offer the best environment for creativity and make a company productive and distinctive. We value diversity and welcome all applications.

Contact

Questions?

1&1 Mail & Media Applications SE
Recruiting & Candidate Management

Brauerstraße 48
D-76135 Karlsruhe
jobs@mail-and-media.com

Please submit your application exclusively through our easy-to-use online application form. This allows us to ensure a transparent application process while maintaining full compliance with all applicable data protection regulations.