What tech stack would you recommend for building a scalable Android social media app?

Frontend: Kotlin + Jetpack Compose
Backend: Node.js (NestJS) or Go
Database: PostgreSQL + Redis
Storage: AWS S3 or GCP Storage
APIs: REST or GraphQL
Auth: Firebase Auth / OAuth 2.0
Realtime: WebSockets / Firebase
Deployment: Docker + Kubernetes on AWS/GCP