We are here for you.

Do you have any questions about our services? Do you have a challenge for our specialists? Would you like to make an appointment or simply visit us in Dülmen? We look forward to your message and will get back to you shortly after receiving it.


Wierlings Esch 14
48249 Dülmen

T+49 (0)2594 5093-110


Marketing and Public Relations:

T+49 (0)2594 5093-114

Contact form

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Contact persons of the STF Group

Dipl.-Kfr. Jutta Müller-Weiske

Managing Director

T+49 (0)2594 50931-10

Dipl.-Ing. Stefan Feldmann

Managing Director

T +49 (0)2594 50931-10

Dipl.-Ing. (FH) Michael Püttmann

Member of the Executive Board / HR Manager/ Authorised Officer

T+49 (0)2594 50931-10

Dipl.-Ing. (FH) Oliver Dziuba

Member of the Executive Board / Authorised Officer

T+49 (0)2102 55857-11

Dipl.-Kfm. Kai Spraul

Member of the Executive Board / Authorised Officer

T+49 (0)40 790121-77

Dipl.-Ing. (BA) Niels Bock, MBA

Member of the Executive Board / Authorised Officer

T+49 (0)2594 279797-40

Stephan Wolff

Account Manager / Authorized Officer

T+49 (0)89 416170-961

Dipl.-Ing. (FH) Frédéric Dildei

Project and Sales Manager Digitization

T+49 (0)6196 2047-431

M+49 (0)152 2883 2457

Dipl.-Kfm. Georg Bergjohann

Head of Marketing & Communication

T+49 (0)2594 5093-114

M+49 (0)151 6720 2787

Dipl.-Ing. (FH) Hans-Jürgen Schumacher

Head of TGA Specialist Planning

T+49 (0)2102 55857-35

Ralf Ramseger

Quality Manager

T+49 (0)2594 50931-26

Quality and innovation are our driving forces