STS
How I designed & launched a payments platform handling $250K+ in daily volume.
Prototyping
UX Design
UI Design
Overview
STS is the biggest Polish betting company with millions of active users. I joined as a Sr Product Designer to help modernize key areas of the app, focusing on improving the mobile payments experience and upgrading the entire user account section. Both areas were critical for user retention, security, and day-to-day usability — and both suffered from outdated flows and inconsistent UI.
Role
Senior Product Designer
Years
2019 — 2021
Type
Full Time
Team
CPO, Head of Mobile, Design Team, Frontend Developers
Tools
Figma
The Challange
Modern Payments
The main challenge was bringing the existing payments and account experience up to modern usability standards while preparing the app for new payment methods. Many flows were functional but outdated, with patterns that didn’t match current mobile design practices or user expectations. At the same time, introducing additional payment options required clearer structure, more flexible layouts, and a UI that could scale without becoming cluttered.
My Role
I was responsible for the UX & UI direction across the product. My job was to bring consistency and usability to a platform that was evolving quickly. I worked closely with product managers, designers, and engineers to shape the product experience in a way that matched the company’s ambitions: simple, smart, and automated.
Discovery
Research & Validation
During the redesign, we relied heavily on Hotjar to understand real user behavior and validate our decisions in real time. Heatmaps and session recordings helped us identify confusing patterns, drop-off points, and areas where users hesitated during payments or account actions.
As new flows and UI concepts were created, we tested them against this data to make sure the improvements weren’t just visually cleaner, but actually solved the usability issues we observed. This continuous feedback loop made the redesign more precise and grounded in real usage.
Thanks to this approach, we've spot one broken flow early — issue that could have cost millions in daily revenue if left unnoticed.
Solution
New Payments & Account
The redesigned experience made the most frequently used sections of the app clearer and easier to navigate. I simplified the payment flows, added straightforward status feedback, and refreshed the account layouts to make them more engaging and pleasant to use. The updated UI stayed true to STS’s identity while feeling more modern and mobile-friendly. Overall, everything became smoother, cleaner, and simply worked the way users expected.
