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Kubernetes Expert (Dovecot Cloud) (m/f/d)

Location: 

Cologne, DE ES Hamburg, DE Nuremberg, DE Leipzig, DE The Hague, NL Turin, IT Olpe, DE Berlin, DE Espoo, FI Bremen, DE FR

Our Mission:

Are you a motivated experienced person, used to working in an international multi-cultural environment, who really wants to make a difference in the open-source world?
At Open-Xchange, we decided to leave dead-end jobs where you don't make an impact and offer passionate experts the opportunity to be part of an agile, international team that connects the world and millions of people by developing and delivering open-source technologies.  
We believe it’s crucial to work in an environment where people feel valued, are energized by their work and deliver added value.
 

Discover what Open-Xchange offers you:

  • Our non-hierarchical organization not only ensures much better value creation for our customers, it also provides the best possible work environment for every one of us.
  • We believe that everyone at OX will always do what is best for the company. We believe that the full potential for high performance is only realized within an organizational structure that enables each individual to work with clear focus and to take full responsibility for their tasks. 
  • At OX we focus a lot on mastery. It influences our decision-making processes and is a great part of how we look at professional development.
  • We believe in openness and diversity, which are crucial to OX’s success. Different opinions, ways of thinking, and cultures enrich us and help us to better understand the bigger picture.
  • At OX you'll be working with the whole tech stack, using open source technology, and delivering excellent products to our customers.

 

Your team:

Dovecot Cloud is one of three expert teams within the Dovecot Constellation, focused on delivering Dovecot Pro for cloud environments – primarily powering OX Cloud. We develop key components like object storage integration, the cluster controller, and Kubernetes-based tooling.
We’re a team of 7 with strong backgrounds in C, Python, operations, and product delivery. We're now looking for a Kubernetes expert to help us design, run, and scale reliable infrastructure for our cloud-based mail platform.

 

Your new job:

  • Designing, operating, and supporting Kubernetes workloads in production.
  • Creating and maintaining Helm charts and deployment pipelines.
  • Writing and maintaining Infrastructure as Code (IaC).
  • Participating in on-call duty rotation to ensure high availability and incident response.
  • Contributing to system architecture, observability, and scalability improvements.

 

This is the tech stack you'll be working with: 

  • System: Linux / Docker / Kubernetes
  • Deployment: Helm / Ansible / Terraform
  • CI: GitLab CI
  • Programming: Bash & Python
  • Specific to our product: Dovecot, Cassandra, Redis, Prometheus, Object Storage, Haproxy
 

Your background:

While experience is essential, a strong ownership mindset and eagerness to continuously improve are highly valued.

  • You have a deep understanding of Kubernetes internals and managing production-grade deployments.
  • You bring strong experience in working with Helm, including creating and maintaining custom charts.
  • You are proficient in Linux systems and container runtimes such as Docker and containerd.
  • You are skilled in automation and scripting, always looking to reduce manual effort and increase efficiency.
  • You have hands-on experience with Infrastructure as Code tools like Terraform or Ansible in production environments.
  • You are familiar with observability tools like Prometheus and Grafana, as well as distributed storage systems.
  • You can effectively communicate in English verbally and in writing across all levels.
  • You are motivated and creative, with a passion for connecting the world through Open Source technology and promoting digital sovereignty.
 

This is what you get at Open-Xchange:

  • The flexibility to work 100% remotely ensures a work environment that suits you best.
  • Flexible working hours that allow you to successfully combine your home and family responsibilities with work. 
  • Stay up to date with latest tech, by working on modern private cloud software in a dynamic, international team.
  • Sharing ideas and collaborating with each other to drive the company’s success is part of our DNA.
  • Getting together in-person for workshops and fun team events. 
  • Time off to volunteer – and mental health support when you need it.
  • We provide financial relief through corporate benefits and a subsidy for ergonomic chairs and desks.
  • We can discuss further location-related benefits together in an initial talk. 

 

Join the team:

Join us in our fight for an open internet and deliver added value! All you need to do is get in touch, so click the ‘apply now’ button, fill the form and be in contact. 

 

Your contact person:

Reach out to Justin (recruiting@open-xchange.com) from the People Team. He will be able to discuss current opportunities and tell you more about our exciting vision and mission @OX.

Apply now »