DEUTSCH Logo ZT Zeiler


"We worked together for a couple of projects concerning opinions and assessments. I got to know a breadthways versed authorized civilian technician with integrity who is an IT-expert that is flexible in time and content. Such properties are needed for an successful collaboration in our connected and public field of activity."

Georg Herder
First Data International


"Günter Zeiler is competent and uncomplicated. He finishes all tasks in a punctual way and he works customer-orientated."

Jürgen Schwalbe
Austrian national bank


"I'll keep it shortly: Günter Zeiler works in a structured way, he is reliable, committed and determined, he has a wide range of professional know-how, delivers good documentations and offers a fair and good value for money!"

Thomas Kuhlmann
Austria Tabak GmbH & Co KG


"Mr. Zeiler supports us in several projects and procurements with his professional know-how. He is a competent and reliable partner for realizing projects in time and in budget."

Robert Ruisz


"Since 2008, I have been working with Günter Zeiler on various integration, carve-out and business continuity projects. He has always supported me very conscientiously with his expertise and various expert opinions. There is hardly no other IT-expert who has more knowledge about cashless payment transactions and the networks behind them than Mr Günter Zeiler. He is all the time a competent and reliable partner for SIX Payment Services/Worldline."

Thomas Gruber
SIX Payment Services (Europe) S.A. | Worldline Global


"Over the years, he prepared several opinions in a targeted and accurate way and led many projects to success with the necessary persistence. He is a very precise and competent partner who is 100-percent reliable."

Ernstjan de Gooyert


"The authorized expert Zeiler has supported us for many years when dealing with complex infrastructure systems. He also ensures the completion of works of our business partners. Furthermore, we benefit from the technical expertise of Mr. Zeiler at our numerous audits. The authorized expert Zeiler is a correct and reliable partner with broad knowledge."

Gerald Kober
Head of IT, Prokurist
PSA Payment Services Austria GmbH