From skeptic to convert: how Fieldy adopted Expo for their AI wearable

Fieldy, a company developing an AI wearable assistant that relies heavily on Bluetooth Low Energy (BLE) connections and background processes, transitioned to using Expo to streamline app development and deployment. Initially skeptical about Expo due to concerns over potential overhead and limitations, the company was persuaded by Tomasz Sapeta, who demonstrated the benefits of Expo, such as reducing app size by 25% and automating deployments. The migration process involved auditing and optimizing their codebase, which included eliminating redundant packages, optimizing imports to reduce JavaScript bundle size, and removing unnecessary native assets. Expo's Continuous Native Generation (CNG) and EAS Workflows facilitated automation and efficient handling of continuous integration and delivery processes, allowing for quick updates without app store delays. Moreover, Expo Modules enabled Fieldy to integrate native Swift and Kotlin code to enhance BLE reliability and manage app termination notifications, illustrating that Expo does not restrict access to native code as commonly perceived. Despite initial challenges, Fieldy successfully embraced Expo, highlighting its advantages in building scalable and maintainable React Native applications.

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