Daniel Tiefnig


Daniel has been working in the ISP business for 15 years designing, implementing and operating some of the biggest ISP systems in Austria and abroad, all based on Open Source software. Prior to co-founding Sipwise he was senior system designer at UPC Austria.


Andreas Granig


Andreas has 15 years of experience in planning, implementing and operating large-scale Internet telecommunication systems. Prior to co-founding Sipwise he was responsible for one of Austria’s largest VoIP systems at UPC Austria.


Gernot Fuchs


Gernot started his career in the IT industry, working as consultant and project manager in Austria and the US. Before joining Sipwise in 2012, Gernot was Director of Engineering & B2B Operations at UPC, Austria’s largest cable operator.


Atilla Ceylan

VP Strategic Accounts

Atilla brings more than 15 years of experience in the telecom and cable industry to his current role. Prior to co-founding Sipwise, he was a member of the Management Team at Priority Telecom.