Linux Kernel Specialist (f/m/d)

at subsidary IONOS SE in Work from home
Full-time | Permanent | Professionals
Reference ID: I-96


About us

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.   


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

The following tasks are part of your field of work:

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


  • You are able to work with the source code 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 a focus on Operating Systems, or equivalent.
  • Experience 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 long-term learning on the job and in teams.
  • Passion for OpenSource and the Linux Kernel.


  • 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.
  • Location: Berlin, Karlsruhe to remotely within Germany.

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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-76137 Karlsruhe