visionOS Developer — Immersive HRV Experience (10-Week Contract)

We are running a 10-week controlled research study using Apple Vision Pro and need an experienced visionOS Developer to build three functional immersive environments that host spatial audio and display live biometric data from a BLE-connected Polar H10 sensor. This is a study environment — stability and reliability matter more than visual polish. What You Will Build 1. Three Immersive Environments Calm / Recovery, Focus / Clarity, and Energise / Activate. Each is a distinct spatial environment. Abstract or geometric visual design preferred. 2. Spatial Audio Integration Each environment plays spatial audio files (provided). Use RealityKit or AVAudioEngine spatial audio. Audio positional cues should enhance the spatial sense. 3. Sensor Data Display A minimal UI overlay showing live sensor readings from a BLE-connected Polar H10 sensor. Pre-session and post-session data capture. Non-intrusive — the audio is the main experience. 4. Session Flow Simple start / end mechanic with a timer display. Clean transitions between states. Single-purpose experience — no complex navigation. 5. BLE Integration CoreBluetooth implementation to communicate with a Polar H10 chest strap. We will provide the BLE specification and a test device. Required Skills - visionOS development — must have shipped or tested on real Vision Pro hardware (simulator-only experience is not sufficient) - RealityKit and Reality Composer Pro — environment construction - SwiftUI for visionOS — UI overlays and session controls - Spatial audio — AVAudioEngine or RealityKit audio - CoreBluetooth — BLE peripheral communication - Strong async communication — you will work with a Cape Town-based team Nice to Have - Experience with biometric data or health/wellness applications - Background in XR, immersive design, or interactive media - Familiarity with biosensor data Timeline - Weeks 1–2: Environment architecture, scene setup, audio integration framework - Weeks 3–4: All three environments functional, spatial audio playing - Weeks 5–6: BLE integration live, sensor data in session overlay - Weeks 7–8: Session flow complete, participant-ready build deployed - Weeks 9–10: Testing support, bug fixes, final build delivery What We Provide - Apple Vision Pro — shipped to you for the contract duration - Polar H10 sensor for BLE testing - Spatial audio files (delivered by week 2) - Visual direction references for each environment - Weekly async check-ins; no unnecessary meetings - Full payment on milestone delivery How to Apply Include in your proposal: 1. A link to a visionOS project built on real hardware 2. Confirmation of real Vision Pro experience 3. Your honest timeline assessment 4. Your fixed price for the full scope Applications without a visionOS sample will not be reviewed.