Case Study — Mobile

Music Player App

A sleek cross-platform music streaming and media player application featuring offline playback, custom playlist queue management, interactive audio visualization, and dynamic adaptive background themes.

Project Overview

A full-featured mobile music streaming app designed with a focus on immersive aesthetics. The player UI reads album art color signatures dynamically, matching the background gradient to the active track. Includes sophisticated background playback service handling, allowing users to lock their screens while listening.

Key Features & Scope

Adaptive styling extracting palette colors from album art in real-time

Secure local caching for songs enabling full offline playback

Dynamic queue controller with swipe-to-remove and drag-to-reorder features

Interactive frequency visualizer using React Native Reanimated

System Architecture

Expo-based React Native app using Redux Toolkit for offline persistent state. The backend uses Node.js and Express to serve media streams over chunked HTTP responses, allowing immediate audio playback with minimal buffering.

Client InterfaceReact Native / Expo
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Backend CoreNode.js / Express
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Database NodePostgreSQL & local SQLite cache
Database: PostgreSQL & local SQLite cache
Deployment: AWS S3 & VPS

Biggest Challenge & Resolution

The Challenge

Background audio playback on both iOS and Android required platform-specific handling, and extracting dominant colors from album art in real-time caused UI jank on lower-end devices.

The Resolution

Built a custom background audio service using Expo AV with lock-screen controls and notification integration. Implemented a Web Worker-based color extraction algorithm that processes album art off the main thread, maintaining 60 FPS animations even on budget devices.

App Startup Time1.5s
JS Bundle Size6.8 MB
Crash-Free Rate99.95%
Render Frame Rate58 FPS
Verified Production Metrics
React NativeExpoTypeScriptRedux ToolkitNode.jsExpress.js

Keywords and concepts covered in this project case study:

React Native Music Player AppExpo audio streaming mobileRedux Toolkit offline music appAlbum art color extraction React NativeBackground playback Expo AV

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