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7/10/2026
The original title is "Building a React Native SDK Inside a Super-App with 800K Daily Users"

The original title is "Building a React Native SDK Inside a Super-App with 800K Daily Users"

Original: Building a React Native SDK Inside a Super-App with 800K Daily Users

Short summary

A detailed engineering account of building a React Native SDK embedded inside Onay, a Kazakhstan super-app with 800K daily users. Key challenges include crash isolation via custom fatal handlers, OTA JS bundle updates through Cloudflare R2 without App Store review, and native bridge management in Swift and Kotlin. The article covers token-based bridge caching, SHA-256 bundle verification, and close coordination with host app teams.

  • •Built a React Native coupons SDK embedded in Onay super-app (800K DAU) without controlling the host app
  • •Implemented OTA updates via Cloudflare R2 with SHA-256 verification, bypassing App Store review cycles
  • •Engineered crash isolation with custom RCTFatalHandler so SDK JS errors never crash the host app

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