I need a skilled Flutter developer to plug a very specific feature set into my existing kids-focused mobile app. The task is all on the client side: build AR camera filters that work with ARCore on Android and ARKit on iOS, track individual eye movements in real time, and capture short videos at defined moments, then push those clips to a REST endpoint that is already live and documented. You will wire up the camera feed, layer the AR assets, implement per-eye tracking accuracy (not just general face gestures), trigger recording when my code tells you to, and send the resulting MP4 to the backend with the required headers and auth token. No UI beyond a minimal overlay is expected, so you can concentrate on the functionality itself. Deliverables • Flutter module(s) that expose AR filters, advanced eye tracking, video capture, and an async upload call • Clean, well-commented Dart code plus any native Swift/Kotlin snippets wrapped with platform channels if needed • Quick README explaining integration points and outlines for build settings on both platforms I already handle all server-side processing; I just need this mobile piece integrated and tested on one recent ARCore phone and one ARKit device before sign-off.