Booking.com
Led design across mobile payment, accessibility and performance teams, contributing to a €35M annual conversion boost.
“Damir brought substantial positive change to our team soon after joining, taking over the visual side of our project, championing the user research, and driving the communication of product vision with the wider design community within the company.”
Payment Redesign
Booking.com processes tens of millions of euros in transactions daily across 140 countries, 50+ currencies, and 40+ languages. The platform supports over a dozen payment methods — from credit cards to PayPal instalments to WeChat Pay — with multiple ways to structure each payment. I led the initial effort to redesign this system, creating a future-proof payment experience across mobile web, desktop web, iOS, and Android.
Research & Prototyping
I prototype early and use it as a research tool. Using a working prototype, I ran remote user testing sessions, compiled the findings into an executive summary with links to key video moments — easy to skim for leadership, with source data available for those who wanted to go deeper. Several assumptions were confirmed: users were comfortable being taken to a separate payment mode before returning to the main site. Others were busted: clicking 'Pay' didn't mean users were ready to pay — they expected one final confirmation step before any money moved.
Conversion Optimisation
I was the lead designer on two teams simultaneously — Accessibility and Mobile Payments — each consisting of 6–8 people across development, analytics, UX writing, research, and management. Every design change was A/B tested with roughly a month of data collection before we reviewed metrics and decided whether to ship. We measured direct conversion impact alongside secondary metrics like support ticket volume and abandonment rates. Due to confidentiality I can't share specifics of each test.
Outcome
The combined impact of my A/B tested conversion optimisation work across both teams was calculated at €35 million per year for the company. In terms of direct commercial impact, this remains the most successful outcome of my career. Every pixel was backed by data — a discipline I've carried into every engagement since.