Skip navigation links
OX logotype

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.

Olpe | ga04-19-rpl

Billing Clerk (f/m/d)

Don’t just go to work. Thrive. 
We need people who are committed to openness, have a rebellious business spirit and the will to revolutionize the market.

Open people for open source! 
By joining OX as part of a special team, this position is a launch pad for highly talented individuals to build their experience and access many opportunities working for OX globally. 

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

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


The Accounting team is looking for a additional dedicated player

We are looking to hire a additional  Billing Clerk for our focused and dynamic team. In this role you would be adding billing, contractual and general adminstation capabilities to the finance team which not only working diligently but also  knows how to have fun at work.


Your Passion / Your Job

  • Master data maintenance of customers and contracts in the billing system ""
  • Order processing and billing for all German and foreign distribution companies as well as our own entities especially regarding licensing-, maintenance- and project factura
  • Checking of accountable time bookings
  • Administration of software licenses and access control lists for the customer portal
  • Tracking of customer payment to prepare the dunning process
  • Point of contact for all customers regarding accounting relevant processes
  • General and secretarial work in the field of general administration
  • General processing in the area of supplier contracts
  • Creation of ad-hoc reports


What do you bring to the table

  • Completed commercial training with several years of professional experience in billing or financial accounting for software companies
  • Very good Microsoft Excel and Word knowledge
  • Experience with CRM / ERP systems
  • Good command of spoken and written English is essential


What do we offer

  • Engaging & interesting tasks in an international & diverse team
  • The most current and jazzy equipment
  • Continuous personal development & training within a dynamic environment
  • Flat hierarchies combined with a "Open Door" policy
  • A company pension scheme
  • Company sports - Free entry to various gyms and swimming baths

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