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Linux Kernel Specialist (f/m/d)

At IONOS, the leading European provider of cloud infrastructure, cloud services and hosting services, you will work together with a wide range of teams. We are characterized by open structures, a friendly working culture and flat hierarchies with a strong team spirit. We firmly believe that work and fun are compatible, and offer you the right environment for this. Our constant growth means that we are always looking for new colleagues. Become part of IONOS and grow with us.

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You will adapt and improve customized Linux kernels for the needs of operation of thousands of servers, and data in the range of petabytes and billions of inodes, in collaboration with system administrators and experts.

  • Fault analysis and debugging of Linux kernels, also in operation.
  • Fixes and testing,,also for the needs of operations.
  • Porting and longterm maintenance of downstream patches.
  • Performance and reliability improvements for the use-cases of operations.


You are able to work with the sourcecode of the operationally relevant parts of customized Linux kernels, where the upstream has a total of millions of lines of code.

  • Master in Computer Science with focus on Operating Systems, or equivalent.
  • Experiences with the programming languages and development tools used by the Linux kernel.
  • Knowledge of Linux kernel architecture and the tasks of its operationally relevant components.
  • Willingness for longterm learning in the job and in teams.
  • Passion for OpenSource and the Linux Kernel.


The following benefits await you:

  • Hybrid working model with home office option.
  • 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.

Job info

Location: Karlsruhe
Type: Full-time
Category: IT Software Development
Work experience: Professionals
Reference ID: 3594


IONOS is the leading European digitalization partner for small and medium-sized businesses (SMB). The company serves around six million customers and operates across 18 markets in Europe and North America, with its services being accessible worldwide. With its Web Presence & Productivity portfolio, IONOS acts as a 'one-stop shop' for all digitalization needs: from domains and web hosting to classic website builders and do-it-yourself solutions, from e-commerce to online marketing tools. In addition, the company offers Cloud Solutions to enterprises who are looking to move to the cloud as their businesses evolve. 

We value diversity and welcome all applications - regardless of, for example, gender, nationality, ethnic or social origin, religion, disability, age as well as sexual orientation and identity, physical characteristics, marital status or any other irrelevant factor subject to applicable law.

Recruiting Team IONOS
Hinterm Hauptbahnhof 3-5
D-76135 Karlsruhe