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Our product · Mobile app · iOS & Android

BTTL: a “message in a bottle” app, from idea to the App Store

A social app where people meet through shared thoughts, songs and films, not photos.

TYPE
Our own product
STACK
Flutter, Go, AWS serverless, WebSocket, Postgres (Neon)
LIVE
bttlapp.com

STEP IThe problem

Build a social app with real-time chat, purchases and user-generated content, and pass Apple’s review for it.

STEP IIOur decision

Rewrite the backend from Laravel to Go serverless and move the database to Neon: with uneven traffic the idle bill is close to zero, WebSockets need no separate server, and heavy matching runs outside the user’s request.

STEP IIIWhat we built

  • One Flutter codebase for iOS and Android
  • Matching on texts, songs (Deezer) and films (TMDb)
  • Real-time chat that opens only with mutual consent
  • In-app purchases on the App Store and Google Play, plus a referral programme
  • Content moderation, reports and blocking, to Apple’s requirements for user-generated content

STEP IVThe result

Passed App Store review and live on the App Store since March 2026.

IF THIS SOUNDS LIKE YOUPrototype Review & Launch SprintBuilt something with AI? Keep what works, rebuild what won’t survive real users.The Foundations ReviewWhen the product creaks: a technical audit and a staged plan, without a big-bang rewrite.
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