Katja Sostar — Product Designer

katja sostar

Hello

👀

My name is Kat,

and I'm a

Product Designer

with 5+ years of experience,

crafting digital products

focusing on

good user experience,

user experience,

product strategy,

scalable

Design Systems

design systems

, and

clean interfaces

and clean interfaces

here's some

of my work

Clubly

Designing around counter speed, solving the slowdown that makes most loyalty apps fail with small businesses.

2026

product design

web

mobile

locked

shopreme

Unified Self-Service Ecosystem. Mobile Scan & Go, Smart Carts, SCOs, Retail Media, and more

product design

mobile

web

saas

2021 - 2026

About me

Originally from Slovenia, currently living in Graz, Austria. I'm a product designer with 5+ years of experience designing products across web and mobile and everything in between. All about mixing design with empathy, and transforming challenges into solutions to make people’s lives easier and this world a little better.

Recently @ shopreme where I've spent my time designing self-checkout solutions for the retail sector, and previously
@ carrot & company leading end-to-end design processes for a variety of different startups..

Recently @ shopreme where I've spent my time designing self-checkout solutions for the retail sector, and previously @ carrot & company leading end-to-end design processes for variety of different startups.

skillls

interface design

user research

usability testing

design systems

product strategy

vibe-coding

Tools

figma

claude code

cursor

userbrain

framer

miro

notion

mixpanel

In my free time, you can usually find me exploring outside. I enjoy reading, cycling, playing squash, hiking and backpacking, and board games with too many pieces.

In my free time, you can usually find me exploring outside. I enjoy reading, cycling, hiking and backpacking, and playing board games with too many pieces.

Playground

AI has made it easier to stay creative. I enjoy prototyping, making tiny apps and games in Claude Code. Below are some extra designs, made either for fun or for work.

PREVIEWS

ASCIIFLORA

bookshelf

Contact

I'm currently looking for new opportunities, so feel free to get in touch, even if just to say hi.

I am currently looking for new opportunities, so feel free to get in touch,

even if to just say hi :)