Antonija Pek
Lead Product Designer who ships code. 15+ years shipping for millions of users at Yousician, Wolt, and AI startups. Latest: Vocabbie, an AI language tutor I designed, coded, and shipped solo to both app stores.
Projects
Shipping Vocabbie taught me more than any design job did
Vocabbie is an AI language tutor, live on iOS and Android. I did the brand, the interaction design, the React Native code, the speech grading and the release pipeline. There was nobody to hand anything off to, so I had to learn the parts of product I used to be allowed to skip.
Opened in 99 countries, Iceland to Mozambique. 42 languages studied, Finnish first. 24,014 flashcards answered. 2,325 decks generated by AI. 71 hours of study logged. One learner has shown up on 59 separate days. Paying subscribers in Finland, Sweden, Germany, Slovakia and Croatia.
There were never any mockups. No Figma file, not one. I designed Vocabbie in code, in the simulator, which meant everything I learned came from the running app: how to tell whether speech scoring is correct and not just plausible. Why a release gate catches more than a design review. What a bundle-size budget quietly does to your feature list. How churn feels when the number is yours.
I could already code before Vocabbie. What changed is depth. Owning the whole thing taught me what a lazy architecture decision costs you six months later, because I had to keep living in mine. Now I ask what a feature will cost to run before I design it, and I can tell an engineer exactly why I'm asking.
- React Native
- Expo
- TypeScript
- Supabase
- TanStack Query
- Reanimated
- RevenueCat
- PostHog
Latest experience
Hiring? The full record, dates and all, is in my CV.
Testimonials
“Antonija is an exceptional sparring partner when it comes to AI tools and workflows. She combines sharp thinking with hands-on experimentation, making complex setups feel practical and immediately useful. Working with her consistently leads to better ideas, smarter automation, and faster learning.”
“She is a very structured and effective designer who can rapidly shape even the crudest bullet-point ideas into refined user-journeys and interactions with minimal guidance.”
“A very talented designer with an exceptionally wide and deep skill set.”
“Proactive, forward-thinking, constantly learning new tools and guiding others to work smarter.”
Skills
Design, code, data, content. I do the whole stack, not just the pretty part, and I ship what I design.
I got tired of doing everything by hand, so I built Dax.
My own AI agent, running on the Claude Agent SDK. I talk to it from my phone over Telegram, by voice or text. It watches Vocabbie's live metrics, runs my calendar, drops todos into TickTick, triages my inbox, and drafts posts in my voice. I didn't buy a tool for this. I built it, and I ship new features into it most weeks.
