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Date: May 25 · 2019

May 25 · 2019


The Roca One Day Design Challenge extends the number of countries where the competition takes place in 2019, and for the first time it will be held in Croatia on May 25th!

Roca originated this initiative in the year 2012, with the aim of supporting the professional development of young architects and designers of the countries it is celebrated in. 

During one single day, the participants are challenged to develop a project against the clock, having to design an element related to the bathroom space that complies with the premises announced in the morning of that same day. 

Are you interested in participating? Stay tuned for the latest news on this year’s edition!


Croatia 2019



9:00-9:30 Registration
9:30 Briefing announcement
12:00 Lunch
14:00 Project submission
16:00 Submission deadline
18:00 Awards ceremony
19:00 End of the event




Silvia Jonjić

Silvia graduated from the School of Applied Arts and Design in Zagreb and from the Design Studio at the Faculty of Architecture in Zagreb, spezializing in product design. She is professionally active in interior, product, and graphic design. She founded the studio "SJ industrial & interior designer", and became the director of Ergoproxi d.o.o. As a product designer she has designed: ICN tilting train (interior and exterior) for Croatian Railways, "Croatian Bathroom-ARIA" - bathroom equipment project created in cooperation with five Croatian manufacturers and Croatian Chamber of Economy, interior of the Naklada Ljevak bookstore, Skalinada restaurant, and many other private and business interiors.

She has exhibited her projects at ISH Frankfurt, MOS Celje-Slovenia and TDZ Lauba-Croatia. She participated in the design jury at the International Furniture Fair 2014 and 2017. She won the Packaging Design Award at the 38th Salon "Alberto Tossi" in Milan for the Mediplast Collection.

In her work, she seeks to realize the interaction between man and the objects through emotions, to question the way we perceive our environment and stimulate reflection on it. She considers it is necessary to constantly communicate the importance of design as an integral part of the economy, industry and culture. 

She is currently President of the Union for Industrial Design - ZzID of the Croatian Chamber of Economy.

Andrea Hercog


Andrea Hercog

Andrea Hercog is a professor at the Faculty of Architecture in Zagreb in the area of Industrial Design. She is highly focused on progress and innovation and a variety of furniture and interior design achievements can be found in her professional work. 

She had the leading role in the implementation of the project ''Design for sustainable development'', which was organised by the Croatian Design Center and she is also one of the ''Reaktor'' founders, the platform that stimulates product design for which she was rewarded by the Croatian Design Association in 2010. 

Andrea has participated in many exhibitions and won numerous awards for her achievements. Her interior design work can be found in many buildings and companies that she collaborates with, both in Croatia and also in Europe. 

File #83198


Robert Križnjak

Born in Zagreb, Croatia, Robert is a graduate from the Faculty of Architecture, University of Zagreb. From 1999 to 2004, he was a Project Leader at APZ inženjering“-Zagreb. In 2004, he established the authorized architecture planning office of Robert Križnjak. Since 2005, he has been working with Martina Križnjak, (M. Arch.).

The Architectural Studio Križnjak is formed by a team of creative architects whose areas of interest and activities include architectural and interior design as well as construction site supervision.  These architects, forming a team, seek to achieve the harmony between the architectural design and the final realization. The main goal is to achieve architecture that combines aesthetics and functionality, integrating into its community. They are the founders and heads of interior section of Društvo arhitekata Zagreb (Zagreb Society of Architects).

Robert also co-operates with the daily paper Jutarnji list.

File #83215


Nikolina Jelić

Nikolina completed the School of Applied Arts and Design in Zagreb, specializing in Interior Design. She graduated from the School of Design at the Faculty of Architecture, University of Zagreb, specializing in product design. 

From 2002 to 2006 she gained work experience in "L-Panel", a Croatian furniture manufacturer, in the Department of equipment and development. In 2006 she founded the Kubus studio for interior design and product design. 

Nikolina is a member of the Croatian Designers Society, the Association of Artists and the Association for Industrial Design. As a designer, she participates in jury exhibitions in Croatia and all around the world. Her coffee table "Void" is exhibited in New York, Milan, Paris, Vienna ... She works on projects that synthesize product design, interior design, exhibition design and business and residential design. She is currently vice president of Industrial Design at the Croatian Chamber of Economy.

Xavier Torras


Xavier Torras

Brand Communications Director of Roca and Director of the We Are Water Foundation since its creation in 2010. He has developed his professional career in the fields of marketing, business strategy and communication.