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UX/UI designer in Prague

Hi! I'm Šimon. I make complex products simple to use.

I lead UX from research and prototyping to user testing, for energy apps, e-commerce and augmented reality. My work for innogy, VZP and Signal Festival has won five industry awards.

Black and white portrait of Šimon Leška smiling in a black T-shirt

Featured clients I worked with

  • Amazon
  • innogy
  • Signal Festival
  • Siemens
  • Nasdaq
  • Nescafé
  • Česká spořitelna
  • Komerční banka
  • Korado
  • Mendel University in Brno

Awards won

Recognised by the industry.

Five WebTop100 and Effie awards for websites, e-commerce and campaigns I worked on.

  • 1st

    Online tool of the year

    Printscreen.cz · WebTop100 2019

  • 3rd

    E-commerce project of the year

    Printscreen.cz · WebTop100 2021

  • 1st

    Best company website

    Leros.cz · WebTop100

  • 2nd

    Microsite of the year

    innosvět · WebTop100

  • 3rd

    Other services

    innosvět · Effie Awards 2018

Selected work

Case studies with real results.

A closer look at how I research, design and test, one project at a time.

  • Augmented reality artwork Visitors by Longyi floating above the park at Karlínské náměstí in PragueAugmented reality app

    01 / Signal Festival

    Signal AR

    An augmented reality module that brought Signal Festival artworks to the streets of Prague, unlocked by scanning markers on site.

    5,000+

    visitors have experienced Signal AR

  • innogy.cz homepage with sections for households and businesses, gas and electricity tiles, a login to innogy24 and the non-stop customer line
    Website and design system

    02 / innogy

    Redesign of innogy.cz

    A complete redesign and rebrand of innogy.cz, with a modular design system and an energy calculator built to win new customers.

    +350%

    calculator completions in three months

  • Printscreen.cz mobile homepage offering canvas prints, posters and photos with an upload button for each
    E-commerce, mobile first

    03 / Printscreen.cz

    Printscreen.cz

    A mobile-first print shop where anyone can upload photos, adjust them in a simple editor and order canvas prints, posters or photos.

    1st

    Online tool of the year, WebTop100

  • innosvět app screen comparing expected and measured gas costs on a chart, with a predicted overpayment of 236 CZK
    iOS and Android app

    04 / innogy

    innosvět app

    An iOS and Android app that turns real-time energy consumption and billing data into clear, useful insights.

    78k

    active users

  • VZP walking campaign landing page with prizes to win and a three step guide to joining the competition
    Campaign web app

    05 / VZP

    Let's go for a walk!

    A GPS check-in campaign that got people walking to tourist spots all over the Czech Republic for a chance to win prizes.

    4,000+

    people joined in 60 days

  • Wine not? welcome screen of the Wunderman wine tasting web app
    Mobile web app

    06 / Wunderman Thompson

    Wine tasting web app

    A mobile-first web app for a company wine tasting: read about every wine, see where it comes from, rate it and order your favourites.

    12

    wines in one tasting

What I believe in

Principles I design by.

Six ideas I keep coming back to, each one backed by a project.

  1. 01

    A happy user means good business.

    On innogy.cz, an energy calculator built around customer needs became the heart of the conversion journey.

    Redesign of innogy.cz
  2. 02

    The best design is contextual.

    Printscreen.cz works on a tram as well as at a desk, because every step shows only the essentials.

    Printscreen.cz
  3. 03

    Real life is full of edge cases.

    In the VZP campaign, standing 100 metres from a spot gets you a nudge to the nearest one, not an error.

    VZP walking campaign
  4. 04

    Prototype it, then test it.

    The innosvět navigation and dashboard were refined through prototypes and usability tests before release.

    innosvět app
  5. 05

    Research comes before pixels.

    Signal AR started with research and benchmarking, then went through paper sketches and layout tests.

    Signal AR
  6. 06

    Design systems are my friends.

    The innogy.cz system of 50+ templates and components went on to power Innogy24 and kariera.innogy.cz too.

    Redesign of innogy.cz
Portrait of Šimon Leška laughing, sitting against a light wall

About me

Behind every project is a lot of thinking, testing and listening.

Get to know how I work, what I bring to a team and what keeps me inspired outside of UX.

More about me