Partner

Sonja Otenhajmer

Languages

German
English
Serbian
Bosnian
Croatian
Italian
Spanish

Social media

Sonja Otenhajmer is a Litigation and Arbitration as well as a corporate and commercial attorney-at-law. She focuses on international arbitration.

Otenhajmer completed her legal studies at the universities of Vienna, Bologna and Belgrade. During her studies at the University of Vienna, which she completed with distinction, she participated in the Willem C. Vis International Commercial Arbitration Moot. She gained varied professional experience as a university assistant at the Institute for Civil Procedure Law at the University of Vienna and in renowned international commercial law firms in Vienna and Madrid. Otenhajmer joined CMS in Vienna as an associate in 2016.

Awards & Recognitions

01 –

Quote

‘We work with Daniela Karollus-Bruner and Sonja Otenhajmer, their work is fast and diligent.’

The Legal 500 EMEA, 2024

Relevant experience

2012–2014 University assistant at the University of Vienna’s Department of Civil Procedure
2010–2015 Practical experience at renowned law firms (Vienna, Madrid)

Publications

Anmerkung zur Entscheidung des OGH 4 Ob 71/14s, EvBl 2015/2.
Internationale Wirtschaftsmediation im studentischen Wettbewerb, JAP 2013/2014
Anmerkung zur Entscheidung des OGH 8 ObS 14/12k, ÖJZ 12/2013, 550.
Sind Leasingentgelte für Superädifikate Sondermassekosten?, ZIK 4/2010, 126.

Memberships & Roles

Young Austrian Arbitration Practitioners (YAAP)
Austrian Bar Association

Lectures list

Vortrag über Mediation und Verhandlungstechniken, Aarhus Universitet, Dänemark, 2014
Universitätslektorin für Zivilverfahrensrecht, Universität Wien (2013–2014)
ICC International Commercial Mediation Competition, Paris, Coachin des Wiener Teams (2013, 2014)

Education

2015 – Mag.a iur., Law, University of Union, Belgrade
2014/15 – Court practice in the district of the Vienna Higher Regional Court
2012 – Mag.a iur., Law, University of Vienna
2011 – Erasmus, Law, University of Bologna

Practice Areas

Dispute Resolution Corporate/M&A Commercial

Insights by Sonja

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Event Austria

University of Pittsburgh Consortium: From clause to case, a panel discussion

26 Mar 2026

Press releases International

CMS announces 54 new partners across international offices

16 Apr 2024 2 min read

News Austria

CMS Partner Sonja Otenhajmer joined the YAAP Advisory Board

07 Dec 2023 2 min read

Deals Austria

Rohlik – parent company of Gurkerl.at – receives 220 million euros of Series D financing. CMS advises investor group.

27 Jun 2022 3 min read