Our Job as Designers:
Making Things Work

We are a multidisciplinary team of specialists in the fields of analysis, conception, storytelling, graphic design, prototyping and programming.

Technical know-how is highly esteemed in our team. This know-how allows us to choose solutions which go far beyond the limits of purely visual design. For our problem solving we use the spectrum of technical and creative tools in full breadth.

We create more
than simply “attractive”
user interfaces.
Design to us means:
Making things work

We have gained great experience in the positioning of digital products. As designers of user experience we devise concepts transcending the confines of mere usability and design. This results in products amounting to far more than the sum of the individual features.

We are sparring partners for executive staff members – but no consulting firm that merely projects presentation slides and makes recommendations. Our support emerges from the design itself: At the end of our job we have a sophisticated product, a functional prototype, an instantly implementable concept, in other words there’s always a specific solution.

We get to the core of the challenges, our customers are confronted with and deliver tailor-made, meaningful solutions.

Your contact partners:
The Illustree Management

David Höller

Founder & Managing Director

David Höller is one of Austria’s leading user experience designers. As content-related general manager, he is responsible for the conception and creative implementation of numerous design solutions.

David Höller studied at the Technical University of Vienna, and then developed mission-critical software with PDTS for several years. In 1999 he founded Illustree together with Thomas Pfaller. Additionally, for more than ten years David has been sharing his knowledge on contemporary user and customer designs at the Universities of Applied Sciences of Hagenberg, Salzburg and St. Pölten.

He found his way to design through technology. And it has profoundly influenced his outlook:

As designers, we are
creative problem solvers.
The quality and precision of the
solution is what counts,
not the artistry in our sketches.
David Höller

The passionate keyboarder and sound wizard does not only love 80s-synthie-pop, but also travelling. Our office has received design ideas reduced to the format of a postcard from as far afield as Belize, Armenia, Georgia, Pakistan and the Iran.

Keqiao Xu

Team & User Experience Lead

In the Illustree team Keqiao Xu is the head of the design team and thus bears the main responsibility for user experience design.

Simplicity to me means
to work oneself
through the depths
to the core of the complexity –
to actually penetrate it.
Keqiao Xu

The experienced product and project manager has devoted his most recent efforts to the concept and functionality of the new digital touchpoints created for ÖBB (Austrian Rail).

Before he was recruited by Illustree in 2013, Keqiao Xu worked as a product manager for A1 Telekom Austria AG. Being responsible for the development of new digital services, he made “Mein A1” the most frequently used A1-app.

Thomas Pfaller

Founder & Concept Director

At Illustree Thomas Pfaller is responsible for conception and strategic planning. After gaining experience in the fields of digital media, database design and software architecture (amongst others with OPS, Vienna) he founded Illustree together with David Höller in 1999.

It is important to us
that everything
about our concepts
is immediately plausible.
Thomas Pfaller

From 2003 to 2013 Thomas Pfaller taught Multimedia Development as part of the Information Design course at the Joanneum, University of Applied Sciences in Graz.

Much like David, rock bassist Thomas devotes a substantial portion of his leisure time to music. His adoration of Frank Zappa goes to the extent that his son Mika even shares his birthday with old master Zappa.