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Site Reliability Engineer (f/m/d)

IONOS SE
TechOps
Karlsruhe
Full-time
I-1585

About IONOS SE

At IONOS, we don't just manage servers – we shape the digital future for more than 6.2 million customers worldwide with our solutions. As Europe's leading hosting provider and a pioneer in independent cloud solutions, we are building next-generation infrastructure – from sovereign cloud architectures and high-performance GPU clusters to integrated AI automation tools. What drives us is digital sovereignty for Europe and real impact for small and medium-sized businesses (SMBs) as well as large enterprises. We work in agile teams, rely on transparent structures, and believe that excellence and innovation only emerge through true team spirit. Ready for your next step? Become part of IONOS and grow with us.

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United Internet Office Building

Tasks

As a Site Reliability Engineer (SRE) in our Application Hosting Team, you form the technical backbone of our product platform for Managed Nextcloud, Nextcloud Workspace, IONOS GPT, as well as other web services that we operate on our Kubernetes platform. Together with experienced colleagues, you design new services and products that remain performant and resilient even under the highest load.

  • Your main area of focus is the further development of the infrastructure/platform for our products, as well as the integration of new products/web services into our Kubernetes and Cloud infrastructure.
  • You are responsible for the stable and secure operation of our product platform. Your expertise is in demand when it comes to in-depth analysis and optimization of our primarily containerized and Kubernetes-based application infrastructure.
  • You live automation. Using tools like Terraform, GitLab CI/CD, and ArgoCD, you provision and manage our entire infrastructure declaratively and reproducibly.
  • You analyze and resolve complex issues in a distributed system landscape and work on the continuous improvement of our platform.
  • You develop and maintain our monitoring, logging, and alerting solutions (e.g., using Prometheus, Grafana, ELK stack) to proactively identify bottlenecks and sources of error.

Qualifications

  • You have several years of experience as a Site Reliability Engineer or in a related role (Linux System Administrator, Platform Engineer, DevOps Engineer, Full Stack Developer) in a Linux and Kubernetes environment.
  • Strong knowledge and several years of experience using the Linux operating system, container technologies, and specifically Kubernetes.
  • You have experience with Infrastructure as Code (preferably Terraform), CI/CD pipelines (e.g., GitLab CI/CD or GitHub Actions), and using Helm Charts.
  • You can confidently develop in at least one programming or scripting language (e.g., Go, Python, Bash) to solve automation and monitoring tasks, and you may already have initial experience building Operators.
  • Experience operating and troubleshooting highly available and distributed production environments, including monitoring, alerting, and log analysis of distributed applications (e.g., Prometheus, Grafana, FluentD, ELK, VictoriaMetrics, Icinga).
  • You have a proactive, solution-oriented, independent way of working, and the ability to systematically analyze and sustainably solve complex technical problems.
  • Good German and English language skills are required.

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

  • Hybrid working model.
  • Flexible working hours through trust-based working hours.
  • At some locations a subsidized canteen and various free drinks.
  • Modern office space with very good transport connections.
  • Various employee discounts for activities and products.
  • Employee events such as summer and winter parties, as well as workshops.
  • Numerous training and development opportunities.
  • Various health offers, such as sports and health courses.

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?

IONOS SE
Recruiting Team IONOS

Hinterm Hauptbahnhof 3-5
D-76137 Karlsruhe
jobs@ionos.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. Unfortunately, we are unable to accept applications submitted via email for the reasons outlined above.