Ceryo

The context

Ceryo is a super-app: a modular mobile application bringing together planning, learning, a content library, real-time messaging, budget, health, travel and places, a rich editor and an AI assistant, all in an Apple-grade, fluid, offline-first experience where every screen must load instantly and behave like a system app.

My role

Product design, architecture and full-stack development, both mobile and backend.

Key features

• Offline-first Batch Snapshot architecture: one screen, one endpoint, instant perceived load.
• Multi-channel real-time via Action Cable: chat, presence, daily plan and learning.
• AI assistant and semantic search powered by pgvector embeddings.
• Unified native health integrations: HealthKit on iOS and Health Connect on Android.
• Rich modules: planning, learning, budget, media, atlas/travel and a TipTap editor.
• A daily dashboard and trophy-based gamification for everyday engagement.
• Rich media: audio/video playback, podcasts and recording, via track-player.
• A social layer and missions, turning usage into lasting habits.

Technical challenges

• Offline-first and synchronization: persistent MMKV cache, skeletons matching the final layout.
• Multi-channel real-time via Action Cable with clean reconnection.
• AI and semantic search: pgvector embeddings and OpenAI for contextual memory.
• Cross-platform health integrations unified across HealthKit and Health Connect.
• iOS/Android in-app purchases and Stripe: a complete subscription cycle.
• Apple-grade mobile art direction: Reanimated, blur, gradients and haptics applied throughout.

Results

A complete mobile super-app, in TestFlight testing and ready for the App Store.

• Apple-grade mobile experience: 60 fps animations, haptics and a canonical art direction.
• Full-stack mastery end to end: React Native, real-time Rails and AI.