Java Software Developer (m/f/d)


Cologne, DE Nuremberg, DE Berlin, DE Leipzig, DE Olpe, DE Bremen, DE Hamburg, DE


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? Are you looking for a role where you can really make an impact?

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 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 – not only to colleagues, but also to everyone using our products.


So this is what you get at Open-Xchange:

  • You’ll learn from experts and increase proficiency by sharing your knowledge and profiting from theirs.
  • You’ll work with colleagues from all over the world, so connecting people is not only our vision, it’s the way we work.
  • You'll use open-source technology and play your part in the fight against big, dominant companies to keep the internet open.
  • You'll work in a company with the whole tech stack.


Does that sound like the working environment for you? If so, please get in touch and we can start the discussion.

Many experts feel trapped in their job and don't think they can make a difference; however, that’s simply not true – everyone can make a difference! 

Be ready to shape your personal future, and the future of millions of people. 

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. 


Team info:

You will be part of our Engineering Services team. Together with your other team members you'll work on customer facing implementations and integrations that are based on OX App Suite as well as on OX Cloud, a modular platform designed to deliver a wide range of cloud-based services for telcos, hosters, and other providers. In collaboration with your team you'll have the unique and rewarding opportunity to be part of new and large scaling projects and shape the way customers get their needs fulfilled.


Our tech stack:

  • Our web development on the middleware is with Java, Junit, OSGi, Linux, Docker, Kubernetes, Vagrant, Apache, Kafka, MySQL, Cassandra, Micronaut, Spring Boot.


Your new job:

  • You design and develop high-volume, low-latency custom solutions for mission-critical systems, delivering high-availability and performance.
  • You analyze & solve technical problems and communicate them to our customers because of your strong focus in customer relationships. 
  • You achieve elegant and maintainable solutions while collaborating cross-functionally with team members, project managers and other engineers in a self-organized way.
  • You complete applications development by coordinating requirements, schedules, and activities; contributing to team.


Your background:

  • You are proficient in developing scalable software based on your experience or personal projects.

  • You can effectively communicate in English verbally and in writing across all levels.
  • You are a team player and you love to share your knowledge and learn from others.
  • You are motivated and creative and want to connect the world through Open Source technology. 


This is what you get at Open-Xchange:

  • The possibility to work full or part time wherever you want in accordance with your needs.
  • 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 cloud software in an international team.
  • Sharing thoughts is part of our DNA so expect Hackathons, Workshops, and Team Events.
  • Look after your fitness – use your company bike, join our company sports or use a range of gyms and other sport facilities, including swimming pools, boxing, yoga etc.
  • We care for your future and invest in you with our company pension scheme.


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 ( from the People Team. He will be able to discuss current opportunities and tell you more about our exciting vision and mission @OX.