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Jobs at Open-Xchange

Interested in becoming part of something big?
You have landed in the right place. We are always looking for great talent to join our variety of departments. Check out our current job vacancies below or send us your speculative application. Become part of an exciting team at OX.

Espoo | rddc01

Software Developer (f/m/d)

Don’t just go to work. Thrive!
We look for people who are committed to openness and have the will to leave their mark in the world. You will join OX as part of a special team. As a talented individual you can advance within your department as well as getting the opportunity to work for OX globally.

Our Vision  
A borderless internet that is open, safe and free.

We are eMail
Worldwide companies like: BT, KPN, Comcast, Cox, 1&1, STRATO, Deutsche Telekom, Vodafone, Orange, Unitymedia, ItaliaOnline, Host Europe, NetCologne, and Rackspace all use our "white label" products for eMail, collaboration and DNS.

Open Source is our foundation
The mix of divergent perspectives, corporate objectives, and personal goals is our foundation and speeds innovation and development.


The Dovecot Team is looking for a dedicated player to join the Team

We're looking to hire a Software Developer to join the Dovecot Engineering Team, preferably in Espoo, Finland, but applicants located elsewhere will also be considered.


Your passion / Your job

  • Writing excellent, understandable and clean C99 code 
  • Understanding Open source software – your name will be publicly show with your commits 
  • Secure coding practices – So far there have not been many security bugs related to Dovecot’s use of C language 
  • Writing unit tests and/or CI tests for your newly written code 
  • Designing and developing new features 
  • Debugging bugs, crashes and performance problems. Sometimes this requires understanding external software (or even hardware), such as the kernel, object storage, NFS, load balancer, firewall, etc. 
  • Writing performance critical code. With Dovecot that mainly means disk IO and memory optimizations, but in some cases also CPU. 


Our ideal candidate would have the following experience and skills

  • Bachelor’s degree in Computer science or corresponding work experience
  • Excellent C language skills, since Dovecot is mostly C99 code
  • Good debugging skills to understand and fix crashes and other strange behavior (gdb, valgrind, strace)
  • Deep understanding of at least some of the following: Linux kernel, memory management, CPUs, file systems, TCP/IP networks, storage solutions 
  • Experience in writing scripts (Python, Bash, Perl)
  • Experience with Linux (Ubuntu, CentOS, Debian, etc.)
  • Determining operational feasibility by evaluating requirements, analysis, solution development, and proposed solutions
  • Ability to work independently with support the of the OX team
  • Goal-oriented working style and high self-motivation
  • Team player and ability to communicate well amongst peers 


What do we offer

  • Working on modern cloud software in an international team
  • Wide scope to develop your own ideas and projects
  • Possibility to occasionally work from home and the opportunity to work from one of our well-appointed worldwide offices
  • The most current and jazzy equipment
  • Continuous personal development & training
  • Flat hierarchies combined with an "Open Door" policy
  • Great fringe benefits

About Open-Xchange

Open-Xchange (OX) is a market leader in Mail / Messaging and DNS-based security services, with more than 200m seats sold through international hosting and telco providers worldwide, including partners such as 1&1, Orange, Italiaonline, Comcast, GoDaddy or Softbank.

We at OX have our roots in Open Source, and this has shaped our view of the world and culture – open, diverse, and with a bias to act, giving everyone at OX room to take responsibility within their team and grow. OX believes in an internet that is open, safe and free. We want to create competitive products that allow our providers to deliver secure internet services with a great user experience, and that respect privacy and generate value.

With some 270+ people worldwide, OX develops and operates Open Source software (aaS) for mail / messaging (OX App SuiteOX Guard) and collaboration / productivity (OX DriveOX Documents). OX’s  Dovecot is the world’s dominant open-source IMAP server software, and our PowerDNS provides secure DNS services to our telco customers and their users.

Our business is fast-paced and changing constantly. We are looking for people who share our beliefs, who are out there to make a difference, are entrepreneurial and enjoy working in a high-tech environment as part of a truly international team. OX is headquartered in Cologne, with further locations throughout Germany (Hamburg, Bremen, Dortmund, Olpe and Nuremberg), the USA (Louisville, KY), Finland, the Netherlands, Italy, France, Spain and Japan (Tokyo).

If you are interested, please contact Jochen F. Schude for further information - or send us your paperless application with a cover letter including the job ID (see at the top left corner), tabular CV, certificates, salary expectations and the earliest possible date of entry by e-mail to recruiting at