Executive board

As Chief Process Officer at TestSolutions GmbH, Florian Fieber is responsible for the test process management of the entire organization as well as the entire training area with the “QualityDojo – TestSolutions Academy”. He has been working in the field of quality assurance for software systems for almost 20 years and has (co-)founded several training and consulting companies during this time. His focus as a consultant and trainer is on test management, test process management and test process improvement.

After studying media informatics and information systems, he initially worked as a software developer for enterprise applications and as a research assistant at the Berlin University of Applied Sciences. Since then, his focus has developed from test analysis and test automation to test management and process improvement and today encompasses all quality assurance aspects of the entire software life cycle. Mr. Fieber has been active as a trainer for “ISTQB Certified Tester” seminars since 2006 and during this time has developed various seminar contents and led numerous seminars for ISTQB Certified Tester Foundation Level as well as the Advanced Levels.

Mr. Fieber joined the GTB to further develop and establish the Certified Tester Scheme. He was Deputy Chairman from 2020 to 2022 and has been Chairman of the GTB since 2022. He is also involved as head of the Acceptance Testing working group and deputy head of the Glossary working group as well as in the Agile and Mobile working groups. At the ISTQB, he has headed the “Testing in Particular Domains” working group since 2024.

Dr. Klaudia Dussa-Zieger is Principal Consultant at Method Park Consulting GmbH and has been involved in software testing and software quality for almost 20 years. She is convinced that “given the increasing complexity of today’s software systems, their development is not possible without testing”. In her specialist field, the continuous improvement of the test process as well as ensuring professional training and further qualification are of particular importance for her.

For more than 15 years she has been trainer for the ISTQB^® Certified Tester Foundation and Advanced Level which allows her to pass on her long-standing experience. She herself holds the ISTQB^® Certified Tester Full Advanced Level certification. Process and test improvements result from the assessments which she carries out as iNTACSTM Competent Assessor (ISO/IEC 15504) for Automotive SPICE. Her book „Software Engineering nach Automotive SPICE“ (German) is listed in one of the top positions in the Amazon bestseller  ranking for the relevant book category.

As Head of the special interest group “Software Test” at the Arbeitskreis Software-Qualität und -Fortbildung e.V. (ASQF, Association for Software Quality and Further Education) she supports an efficient transfer of knowledge and a continuous exchange of experiences. In addition to this, she lectures in software testing at the Erlangen-Nuremberg University in order to give students the know-how and skills required for their careers.

Since March 2009 Klaudia Dussa-Zieger is Chairperson of the DIN working committee „System and Software Engineering“ and is involved actively at an international level in the development of standards. The development of the new testing standard ISO/IEC/IEEE 29119 is only one of the topics she is in charge of in this context.

Dietrich Leimsner likes to talk about the tester’s “dirty imagination”, which cannot be replaced by machines, when he explains why, even in times of test automation and AI-supported test case generation, the human element of the trained software tester must not be missing in comprehensive software quality assurance.

He has been working at DB Systel GmbH, a Deutsche Bahn AG company, since 1999. With the ticket vending machines, which were still quite new at the time, he became familiar with the appeal and challenges of comprehensive quality assurance directly at the interface between the digital (the sales data record) and the physical (the actual ticket). As a result, he has been working exclusively on this topic in various large systems with board and customer visibility since 2006.

In 2014, Dietrich Leimsner took over the design and further development of DB Systel’s test process and responsibility for the associated methods and tools. In this context, he now deals with the challenges of software quality assurance and how this is perceived when the company reorganizes its structure and project organization according to agile principles.

Dietrich Leimsner has been deputy chairman of the GTB since 2022 and is involved in the working groups Professional Profile Tester, Glossary and Business Development. He also actively represents GTB and DB Systel in the specialist group “Test, Analysis and Verification of Software” (TAV) of the German Informatics Society (GI) and represents GTB on the Board of Trustees of the German Award for Software Quality (DPSQ).