Janko At Warp Speed

Hello. I am an interaction designer with 20 YEARS of EXPERIENCE in designing and developing digital products & services


Janko sketching

My work

Although it's always nice to see screenshots of a final product, the process of arriving at the final design is far more important. For this reason, each project in my portfolio is explained through a small case study that shows a design process and example artifacts.

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Examples of my work

Latest from the blog

How (not) to get feedback from users

What do you think about xyz feature? What can we improve so that the product fits your needs? What would you change on this screen? Asking users for an opinion about our design might be the quickest way to get feedback, but it is arguably the worst way to do it. Furthermore, taking opinions or… View Article

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More recent posts

Digital and physical

On writing again

Starting my own business

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Public speaking

I often speak on conferences in the country and sometimes in the region. My talks are focused on explaining various aspects of design processes. Besides this, I often organize design workshops for design teams and companies.

The book

I co-authored Smashing Book 2 with the chapter Sketching, Wireframing and Prototyping. It describes the process of moving from abstract ideas to concrete solutions and explains the workflow, tools and techniques available when designing user interfaces.


I run a tiny design agency with my wife. It’s a harmonized team of two experienced professionals helping worldwide clients create their digital products and services.

Website coming soon