Implementation time 24-36 hrs max Connect only if you can deliver within 36 hrs I need the Sinch SDK added to both my iOS app (Swift) and Android app (Kotlin) so users can place voice calls, start video calls, and exchange messages in real time. All users sign up and log in with Firebase Authentication via email and password—no social sign-ins are required—so the Sinch user IDs should map cleanly to the Firebase UID that is already stored. Push notifications are a must: incoming calls and new messages have to wake the app through APNs on iOS and FCM on Android, show the native call or chat banners, and take the user straight into the relevant screen. Deliverables • Integrate Sinch voice, video, and messaging modules in both codebases • Connect Sinch user management to existing Firebase email/password auth flow • Configure APNs and FCM so notifications arrive even when the app is killed • Sample UI hooks (swiftUI / XML) that demonstrate the features working end-to-end • Brief setup document and final source commit Acceptance criteria 1. Two test users can call, video-chat, and message each other on both platforms with <1 s latency. 2. A push notification appears within 2 s for an incoming call or message when the app is in the background or terminated. 3. No crashes or memory leaks observed in a 5-minute continuous call run on an iPhone 12 and a Pixel 6. Code is currently in private GitHub repos; I will add you as a collaborator once we agree on milestones. Let me know the estimated timeline and anything you need up front to get started.