convex - Team

Glanvet Barretto

Glanvet Barretto
MSc
speaks: English, Hindi, Marathi, German

convex ZT GmbH, Graz
Structural engineer

Tanja Bauer

Julian Ebeling
speaks: German, English

convex ZT GmbH, Graz
Civil engineer

Srdjana Borkovic

Srdjana Borkovic
MSc
speaks: Serbian, German, English

convex ZT GmbH, Graz
Architect

Ana-Maria Caballo

Ana-Maria Caballo
MSc
speaks: Spanish, German, English

convex ZT GmbH, Graz
Engineer

Lukáš Černosta

Lukáš Černosta
Dipl.-Ing.
speaks: Czech, English

convex consult s.r.o., Bříza/Czech Republic
Civil engineer

Lukáš Černosta studied civil engineering at the Prague University of Technology. He is founding partner and managing director of convex consult s.r.o. since 2024.

Ilker Demir

Ilker Demir
Dipl.-Ing.
speaks: Turkish, German, English

convex ZT GmbH, Wien
Civil engineer

Andrii Dobroliubov

Andrii Dobroliubov
speaks: German, Ukrainian, English

convex ZT GmbH, Graz
Civil engineer

Anes Dzinic

Anes Dzinic
speaks: German, Bosnian, English

convex ZT GmbH, Graz
Civil engineer
responsible for 3D-print and drone flight

Julian Ebeling

Julian Ebeling
speaks: German, English

convex ZT GmbH, Graz
Civil engineer

Konrad Edegger

Konrad Edegger
Dipl.-Ing. (FH)
speaks: German, English

convex ZT GmbH, Graz
Division Manager special issues
responsible for training and education

Konrad Edegger studied construction design and management at the FH Joanneum Graz. He is division manager for special issues since 2016.

Madjid Fazeli

Madjid Fazeli
Dipl.-Ing.
speaks: Persian, German

Madjid Fazeli e.U., Graz
Civil engineer

Madjid Fazeli studied civil engineering at the Graz University of Technology. He is co-founder of the engineering practice Fazeli-Wolfesberger Ingenieure GesBR. Madjid Fazeli joined convex ZT GmbH working self-employed in 2014.

Salman Gandarov

Salman Gandarov
BSc
speaks: Spanish, Adyghe, Russian, English

convex ZT GmbH, Graz
Civil engineer

Robert Gaspar

Robert Gaspar
Ing.
speaks: German, English

convex ZT GmbH, Graz
Civil engineer

Murat Gökçe

Murat Gökçe
Dipl.-Ing.
speaks: Turkish, German, English

convex Ltd. Şti., Istanbul
Managing Director

Murat Gökçe studied civil engineering at the Istanbul University of Technology and in the following, at the Vienna University of Technology. After fifteen years of management experience in various international companies, he joined the convex group in 2006 as founding partner of convex Ltd. Şti.

Emilia Gonzalez

Emilia Gonzalez
speaks: German, English, Spanish

convex ZT GmbH, Graz
Civil engineer

Sandra Heiligenbrunner

Sandra Heiligenbrunner
Dipl.-Ing.
speaks: German, English

convex ZT GmbH
Authorised officer
Division Manager building construction
responsible for Human Ressources

Sandra Heiligenbrunner completed an apprenticeship in technical drafting, and studied civil engineering at the FH Campus Vienna and after that at the FH Joanneum Graz. She is division manager for building construction since 2016 and authorised officer since 2017.

Thomas Heinz

Thomas Heinz
Ing.
speaks: German, English

Stahlbauplanung Heinz, Kreuzlingen
Civil engineer

Anita Hiden

Anita Hiden
speaks: German, English

convex ZT GmbH, Graz
Office Management

Viktoria Hofer

Viktoria Hofer
Ing.
speaks: German, English

convex ZT GmbH, Graz
Engineer
responsible for team- and project photography

Andrea Hofer

Andrea Hofer
Dipl.-Ing.
speaks: German, English

convex ZT GmbH, Graz
Architect

Ondřej Horák

Ondřej Horák
Dipl.-Ing.
speaks: Czech, English

convex consult s.r.o., Bříza/Czech Republic
Civil engineer

Marina-Edvina Iosu

Marina-Edvina Iosu
Dipl.-Ing.
speaks: Romanian, English

convex consulting engineers s.r.l., Cluj-Napoca
Engineer

Raphaela Karner

Raphaela Karner
BSc
speaks: German, English

convex ZT GmbH, Graz
Architect

Muhannad Kassem

Muhannad Kassem
BSc
speaks: Arabic, German, English

convex ZT GmbH, Graz
Civil engineer

Emrah Kemaloğlu

Emrah Kemaloğlu
Dipl.-Ing.
speaks: Turkish, German, English

Emrah Çagatay Kemaloğlu e.U., Wien
Civil engineer

Başak Keser

Başak Keser
MSc in Environmental Engineering
speaks: Turkish, English

convex Ltd. Şti., Istanbul
Senior specialist sales & business development

Martina Klinger

Martina Klinger
speaks: German

convex ZT GmbH, Graz
Office Management

Andrea Klug

Andrea Klug
Ing.
speaks: German, English

convex ZT GmbH, Graz
Civil engineer

Juraj Kmet'ko

Juraj Kmet'ko
Ing.
speaks: Slovakian, English

convex ZT GmbH, Bratislava
Engineer

Elias Kofler

Elias Kofler
speaks: German, English

convex ZT GmbH, Graz
Civil engineer

Sucheta Kolhatkar

Sucheta Kolhatkar
Technician
speaks: Marathi, Hindi, Japanese, English, German

convex ZT GmbH, Graz
Civil engineer

Natalie Kraxner

Natalie Kraxner
Ing.
speaks: German, English

convex ZT GmbH, Graz
Project Manager
currently on parental leave

Claudia Lackner

Claudia Lackner
Ing.
speaks: German, English

convex ZT GmbH, Graz
Engineer

Thomas Markus Laggner

Thomas Markus Laggner
Dipl.-Ing. Dr.techn.
speaks: German, English

convex ZT GmbH, Graz
Managing Director

Thomas Laggner studied civil engineering at the Graz University of Technology, and made also his PhD there. Thomas Laggner is teaching Reinforced Concrete Construction at the FH Joanneum Graz since 2022. He is division manager since 2023 and managing director since 2024.

Jürgen Lohmann

Juergen Lohmann
Ing.
speaks: German, English

convex ZT GmbH, Graz
Division Manager construction design
responsible for IT

Jürgen Lohmann graduated from the HTBLA Ortweinplatz in Graz. He is division manager for construction design since 2016.

Liebhard Mattuschka

Liebhard Mattuschka
MSc
speaks: German, English

clone:it GmbH, Graz
Civil engineer

Gianina-Romina Miron

Gianina-Romina Miron
MSc
speaks: Romanian, German, English

convex ZT GmbH, Graz
Civil engineer

Wolfgang Nesitka

Wolfgang Nesitka ✝
FH-Prof. Dipl.-Ing. Dr.techn.
Legally certified expert

Wolfgang Nesitka studied civil engineering at the Graz University of Technology, and made his PhD at the same institution. He was Technical Director at the construction Company Ed. Ast & Co. in Graz, and in the following, Head of the Study Course "Construction Design and Economics" at the FH Joanneum University of Applied Sciences in Graz. He is founding partner of convex ZT GmbH. Wolfgang transferred his shares in convex ZT GmbH to Thomas Laggner in 2024 due to age reasons. Wolfgang died on 27 November 2024 at the age of 86. He was at our side in an advisory and supportive manner until his death. We will never forget him.

Erwin Neumeyer

Erwin Neumeyer
Ing.
speaks: German, English

Erwin Neumeyer, Gloggnitz
Site supervisor

Armend Nura

Armend Nura
Dipl.-Ing.
speaks: German, English, Albanian

convex ZT GmbH, Graz
Structural engineer

Rajashree Omprakash

Rajashree Omprakash
MSc
speaks: Hindi, German, English

convex ZT GmbH, Graz
Civil engineer
currently on parental leave

Roland Paier

Roland Paier
Dipl.-Ing.
speaks: German, English

DIROPA IT GmbH
IT Manager

Roland Paier studied Business Informatics and is Microsoft Partner (Datacenter and Midmarket Solution Provider). Since 2004 he has been in charge of the IT infrastructure of convex ZT GmbH.

Katja Ratschiller

Katja Ratschiller
speaks: German, English

NYXAS OG
Website Designer

Katja Ratschiller is web designer. Since 2008 she is in charge of the website of convex_AT, convex_TR and convex_RO.

Yahya Saral

Yahya Saral
Dipl.-Ing.
speaks: Turkish, English

convex Ltd. Şti., Istanbul
Survey engineer

Jakob Schadner

Jakob Schadner
BSc
speaks: German, English

convex ZT GmbH, Graz
Architect

Murat Sezer

Murat Sezer
Technician
speaks: Turkish, English

convex Ltd. Şti., Istanbul
Site supervisor

Süleyman Sezer

Süleyman Sezer
Dipl.-Ing.
speaks: Turkisch, English

convex Ltd. Şti., Istanbul
Civil engineer

Izudin Sisic

Izudin Sisic
Ing., BSc
speaks: Bosnian, German, English

convex ZT GmbH, Graz
Division Manager BIM
responsible for VR- and AR-applications

Izudin Sisic studied civil engineering at the Graz University of Technology, Austria. He is division manager for BIM at convex ZT GmbH since 2023.

Pontus Skoog

Pontus Skoog
MSc
speaks: Swedish, German, English

Skoog e.U., Graz
Mechanical engineer

Bernd Spatzenegger

Bernd Spatzenegger
Dipl.-Ing.
speaks: German, English

p-m-consult e.U., Purkersdorf
Mechanical engineer

Roland Stickler

Roland Stickler
Dipl.-Ing.
speaks: German, English

convex ZT GmbH, Vienna
Contract manager

Uğur Sümengen

Uğur Sümengen
Dipl.-Ing.
speaks: Turkish, English

SCi Mühendislik, Istanbul
Civil engineer

Tacettin Sümer

Tacettin Sümer
Dipl.-Ing.
speaks: Turkish, English

convex Ltd. Şti., Istanbul
Civil engineer

Tassilo Szyszkowitz

Tassilo Szyszkowitz
Dipl.-Ing. Dr.techn.
speaks: German, English

convex ZT GmbH, Graz
Partner

Tassilo Szyszkowitz studied civil engineering at the Graz University of Technology, and made his PhD at the same institution. He co-founded the engineering practice Graber-Szyszkowitz ZT GmbH 1981 in Graz, Austria. Since 2006, he is partner of convex ZT GmbH.

Jennifer Thorer

Jennifer Thorer
speaks: German, English

convex ZT GmbH, Graz
Engineer

Elisabeth Uhl

Elisabeth Uhl
Ing.
speaks: German, English

convex ZT GmbH, Graz
Engineer

Timur Uzunoğlu

Timur Uzunoğlu
Dipl.-Ing. Dr.techn. MICE CEng
speaks: German, Turkish, English, French

convex ZT GmbH, Graz
Managing Director
responsible for quality assurance

convex consulting engineers s.r.l., Bucharest
Director

Timur Uzunoglu studied civil engineering at the Vienna University of Technology, and made his PhD at the Graz University of Technology. In 2004, he founded convex ZT GmbH. Timur Uzunoglu is teaching Industrial Construction at the FH Joanneum Graz since 2005. He represents the British "Institution of Civil Engineers" in Austria.