Certified Developers

LibreOffice Certified Developers

LibreOffice Certified Developers are individuals who have proven their ability to master LibreOffice code: to develop new features; provide L3 Support to enterprise users; research and develop solutions to new or unknown issues; design and develop one or more courses of action to correct these issues; evaluate each of these courses in a test case environment; and implement the best solution to the problem. Once the solution is verified, it is delivered to the customer and given back to the community.

Certified Developers are present TDF members, are nominated by the Certification Committee, and subsequently peer-reviewed by the Engineering Steering Committee.



phone +49 40 2093 4085 0

Armin Le Grand
Balázs Varga
Gabor Kelemen
Jan-Marek Glogowski
Kohei Yoshida
Michael Stahl
Samuel Mehrbrodt
Thorsten Behrens



phone +49 (89) 14360 -454 (en) or -444 (de)

Jürgen Funk
Serge Krot
Vasily Melenchuk



phone +44 (0)1223 362967

Aaron Budea
András Timár
Ashod Nakashian
Dennis Francis
Gülşah Köse

Henry Castro
Jan Holesovsky
Justin Luth
Luboš Luňák
Marco Cecchetti
Michael Meeks
Mike Kaganski
Miklos Vajna
Noel Grandin
Pranav Kant
Szymon Kłos
Tamás Bunth
Tamás Zolnai
Tomaž Vajngerl
Tor Lillqvist



phone +34 981 913991

Jacobo Aragunde Pérez


Landeshauptstadt München

Michael Weghorn


Red Hat

Caolan McNamara
David Tardon
Eike Rathke
Stephan Bergmann



Fridrich Strba


The Document Foundation

Christian Lohmaier
Xisco Faulí Tarrazona



Andreas Heinisch
Bartosz Kosiorek
Bjoern Michaelsen
David Ostrovsky
Jim Raykowski
Katarína Behrens
László Németh
Lionel Elie Mamane
Mark Hung
Markus Mohrhard
Muhammet Kara
Muthu Subramanian
Regina Henschel
Rene Engelhard
Tünde Tóth
Winfried Donkers


Notes on the aforementioned entries: our list of certified developers is for your information, randomized, and not necessarily complete nor up-to-date. Specifically, TDF does not recommend nor endorse any of the listed companies. Interested parties are asked to assess individually if the listed companies are suitable for their respective requirements. If you notice mistakes or inaccuracies, please inform us at info@documentfoundation.org.

This list is a small subset of those who have committed code to the project, and a subset of those with commit rights who can commit code to the project. This list is expected to grow over time, as more of the existing contributors go through the certification process.