I’m looking for an experienced React Native developer with strong real-time audio experience to build the JS wrapper layer for a set of native audio modules (iOS Swift + Android Kotlin already in development). These native modules send continuous audio analysis data (levels, pitch, FFT). Your job is to create the React Native logic layer that organizes these signals into clean, reliable APIs for the UI. This is not UI/UX work, this is the internal engine layer between native audio and the visual interface. WHAT YOU WILL BUILD (WRAPPER / ENGINE) You will implement the RN-side logic for several audio-based tools in the app (details provided after initial screening). The wrapper will need to handle: 1) AUDIO EVENTS AND PROCESSING -real-time pitch stream -FFT spectrum stream -microphone level stream -JS-side smoothing / filtering -throttling to avoid UI overload -unified cross-platform event shapes 2) ENGINE LOGIC FOR TOOLS (high-level) You will create RN logic for multiple audio tools (full details shared privately), including: -start/stop control -internal state management -timing/scheduling -calibration where needed -volume/mute control (global) -configuration options for each tool 3) CROSS PLATFORM REQUIREMENTS -identical behavior on iOS and Android -safe lifecycle handling -proper listener cleanup -reliable performance across devices 4) DELIVERABLES -Full TypeScript wrapper -Clean folder structure -Documentation for each API -Minimal test screens (no design, only functional) MUST HAVE React Native (3+ years) Experience with real-time audio / DSP data Familiarity with native iOS/Android bridges Ability to write clean, minimalistic architectures