Implementing end-to-end encryption in React Native
saas · 2024 · Frontend Developer
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A modern, real-time chat application built with serverless architecture, featuring end-to-end encryption, media sharing, and seamless performance.
React NativeTypeScriptExpoTanstack QueryTamaguiSAAS2024React NativeTypeScriptExpoTanstack QueryTamaguiSAAS2024
The problem
What we were up against.
Every build has friction. These were the constraints worth designing around.
Managing message state with TanStack Query
Handling large media files on mobile
Inside the build
Feature by feature.
Screens and scope — what shipped and why it matters.
Built real-time messaging app with React Native and Expo
Screens
scroll the build →
Tap any frame to zoom.
Under the hood
How it works.
A modern, real-time chat application built with serverless architecture, featuring end-to-end encryption, media sharing, and seamless performance.
Used Expo Crypto for client-side encryption
Implemented TanStack Query with optimistic updates
Built progressive upload with Expo Image Picker
Used FlashList for performant message rendering
Built with
- React Native
- TypeScript
- Expo
- Tanstack Query
- Tamagui
01React Native
02TypeScript
03Expo
04Tanstack Query
05Tamagui
My role
Frontend Developer on FunctionChat.
A modern, real-time chat application built with serverless architecture, featuring end-to-end encryption, media sharing, and seamless performance.
Successfully built end-to-end encrypted messaging
Smooth real-time chat experience with optimistic updates
React Native
Platform
End-to-End
Encryption
TanStack Query
Real-time
Stack
Tools that shipped this build.
- React Native
- TypeScript
- Expo
- Tanstack Query
- Tamagui
Outcomes & next
What landed — and what's still on the list.
- Seamless media upload and preview functionality
- Maintained 60fps scroll performance with FlashList
- Positive feedback on modern, responsive UI
Building something similar?
I ship web and mobile products — from UI polish to the unglamorous backend work that keeps them running.