Antonija Pek

Lead designer for the GuitarTuna mobile app, the most downloaded tuning app in the world with 100M+ downloads and 20 million monthly users.

• Own the core app experience: tuning, and everything people do with a song, from picking one to playing it.
• Lead design and frontend for the rewrite from the old Unity stack to React Native. Established the new design system, built the Storybook myself, and write the frontend with AI-assisted coding, in the same repo and pull requests as the engineers.
• No dedicated PM on the team this year, so I ran the product with the tech lead: read the numbers for the quick wins, proposed what to build next, and made the business case for it. I report to the CPO.
• Built a prototype React Native app as a playground: every idea goes in front of testers there before I present it to leadership for the roadmap.
• Data lead for design. Designed retention and activation: onboarding, FTUE, paywall and re-engagement, run as experiments with product and engineering, grounded in user research and product analytics.
• Built the team's Figma tooling: song metadata populator, icon creator, multi-language preview stress-tester.
• Organise Yousician Design Jam, a Helsinki meetup for product designers.

AI meeting summarisation, early stage, working directly with the founders.

• Designed the core summary interface and onboarding; iterated weekly on early-adopter feedback.
• Patterns for showing AI confidence and uncertainty so outputs read as trustworthy and actionable, not opaque.

AI startup for sales teams. Strategic design partner to the founders.

• Built the design system from zero, shaped product UX, ran iterative research to tie design to business goals.
• Hired and mentored the first designers; set up the design function.

Consumer Retention & Engagement, then Merchant Experience. Consumer apps, B2B dashboards and internal tools across Europe.

• Designed Wolt+, the loyalty subscription, with Brand and several product teams; then B2B promotions and loyalty tooling for merchants.
• Redesigned merchant Analytics; designed and built an internal A/B testing platform the org used to decide on real data.
• Built Figma plugins for the design org, including Salmiakki (real data in mockups, on the Wolt engineering blog) and a localisation plugin. Founded Wolt Design Talks, an internal meetup series.

Enterprise eCommerce personalisation, embedded in an agile team of engineers and a PM.

• Shipped Dynamic Bundles and a Category Merchandising tool: months of client research and iteration turned into a flexible, simple enterprise product. Wrote frontend code to ship it.
• Coded in the design system as a regular contributor: components, documentation, Slack notifications, contribution workflow. When the team needed extra hands, I shipped business logic with those components too.

B2B and B2C karaoke apps on iOS, Android and web.

• Audited analytics, rebuilt information architecture and navigation on three platforms; established the design system and brand guidelines.
• Revamped onboarding and registration; the iOS app was later featured by Apple.
• Designed the proprietary Apple TV app and the iPad app used in venues. Redesigned the whole product from scratch as an evergreen solution that still runs as the backbone of Singa venues today.

• Designed, coded and shipped solo to the App Store and Google Play. React Native, Expo, TypeScript, Supabase, TanStack Query, Reanimated, RevenueCat, PostHog. No Figma file: designed in code, in the simulator.
• Brand, interaction design, speech grading, AI-generated decks, release pipeline, growth. Learners in 99 countries, paying subscribers in five.

• TypeScript service that drops in for the Firecrawl API on your own machine: static fetch fast-path, real logged-in Chrome through a bundled extension bridge, structured extraction, change tracking, scheduled watches, dashboard, MCP server. My agents and Claude Code use it daily.

• Reached over Telegram by voice or text. Watches Vocabbie metrics, runs my calendar, triages inbox, drafts posts in my voice. Wired into PostHog, Pinecone, Firecrawl, Browserbase, Deepgram, ElevenLabs.
• Sisu & Rakija, a memoir written from voice notes, runs on n8n: voice note in, Whisper transcript, ghostwriter LLM step, chapter committed to GitHub, web reader rebuilt on Vercel.