Authorised signatories

Sabrina Bublitz (CPO)


Sabrina Bublitz (born in 1981) has been working for ecotel communication ag since 2016. Since 2023, in her role as Chief Commercial Officer (CPO) and authorised signatory she has been responsible for the areas of Project Management, Process and Quality Management, Special Solutions and the Project Management Office. Sabrina Bublitz has worked in the telecommunications sector since 2005, holding a range of positions at various companies in the areas of sales and product, process and project management.


Oliver Jansen (CBO)


Oliver Jansen (born in 1968) has been working for ecotel communication ag since 2013. Since 2023, he has been responsible for cloud telephony as Chief Business Officer (CBO) in the role of Chapter Lead. Oliver Jansen has been working since the early nineties in the telecommunications industry, operating in the areas of sales, marketing, business and product development.


Holger Hommes (CFO)


Holger Hommes (born in 1977) has been working for ecotel communication ag since 2014, initially as a Commercial Director and since September 2016 as Chief Financial Officer (CFO) and authorised signatory. He is responsible for the financial area, consisting of group controlling and reporting, controlling, financial accounting and billing. He is also in charge of compliance management and investor relations. Holger Hommes has more than 20 years of experience in the areas of group management, preparation of financial statements and auditing


Wilfried Kallenberg (CTO)


Wilfried Kallenberg (born in 1960) has been working for ecotel communication ag since 2008. As Chief Technical Officer (CTO) and an authorized signatory, he is responsible within the company for the areas of the company´s data centre, IT (systems engineering and development, network management & operation as well as all engineering areas.