I picked QueueQuest from the list of social app ideas Paul (my programming I & II lecturer and Vibeathon organiser) gave us at CodeFest's Vibeathon, and shipped my first mobile app ever in 3.5 hours. Never touched React Native, Expo or any mobile-first language before that day. I mocked the UI in Figma first with inspiration from Dribbble, then bootstrapped the project and just started building. Wired up Convex (due to their sync engine and ease of configuration) for the backend and schema, added BetterAuth (because it's self-hosted and really easy to set up with Convex) for login, then kept iterating: image handling, a feed ranking algorithm based on popularity and stars, an hourly "Trending now" section, and campus maps.
I used OpenCode and Claude(Sonnet 4.6 & Opus 4.6) to burn through boilerplate quickly, which freed me up to actually debug the stuff that mattered. I spent about 30 minutes alone just wrestling with the simulator setup. Took Gold in the AI-assisted category. The organiser called it the most production-ready MVP of the day, which felt good given I genuinely had no mobile development experience going in.
It was a hackathon project so the code is exactly what you'd expect, held together in places. But the core idea is solid.