Making AI feel human in a mobile app with Expo, Reanimated, and Skia

Daehyeon Mun, a Senior React Native Engineer and Expo App Award Winner, developed Callie, an emotionally intelligent self-care app designed to assist individuals recovering from eating disorders. The app, distinguished for its creative design and interaction patterns, leverages technologies like Expo, React Native Reanimated, and React Native Skia to deliver a warm and stable user experience. Callie's interface prioritizes calm and gentle transitions, tailored to the emotional sensitivities of its users, and features such as the AI-driven "Callie's journal about you" which includes a shader-based "page curl" effect to enhance personal engagement. As the sole engineer at an early-stage startup, Mun utilized Expo's infrastructure to maintain a rapid development pace and focus on user-facing improvements, allowing for quick iteration and deployment via OTA updates. This strategic approach enabled Callie to achieve a high-quality mobile experience, reflected in its high user ratings and recognition as the Most Creative App at the 2025 Expo App Awards.

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