Karolis Kosas Portfolio
Product Designer at OpenAI, previously Stripe. His 'Cinema Club' case study — a cross-cinema-chain ticketing app that shipped on the App Store and Google Play — is a clean example of a research insight driving the entire information architecture.
What makes it work
A breakdown of the choices that make this portfolio stand out.
One finding drives the core IA decision
A single, clearly-stated research insight becomes the app's two-pathway navigation structure — a clear trace from finding to structural decision.
Behavioral detail beyond the obvious
Noticing incidental behavior (screenshotting showtimes to share) led directly to a Favorites and social-sharing feature nobody asked for directly.
Named shipped outcome
Confirming the app launched on both major app stores with improved retention is an actual ship date and business-relevant metric category, not just a mockup gallery.
What Product Designers can take from this
Specific, actionable tips to apply to your own portfolio — no generic advice.
Distill your research down to one memorable, quotable statistic, then show explicitly how it shaped a structural decision.
Look for incidental user behavior in addition to the stated task — it often reveals a feature nobody asked for directly.
State what stores/platforms you shipped to and in what timeframe, even without exact numbers.
More Product Designer portfolios
Ready to build your portfolio?
Follow the Product Designer roadmap — skills, projects, and timeline to get hired.