What are some of must have skills for a Mobile App Developer in 2021?

Just getting back into Android dev myself. Rapid workflow stack: Jetpack Compose / Kotlin, Material Design UI kits and Stripe / Firebase Cloud Functions. The emphasis on being able to go from idea to release in the shortest time frame. Target being Fast Mobile Commerce

https://github.com/android/compose-samples

https://material.io/resources

https://firebase.google.com/docs/use-cases/payments

Other than that I'm excited about next-gen low latency audio library Oboe and real-time physically based renderer Filament

https://github.com/google/oboe/tree/master/samples

https://github.com/google/filament/tree/main/samples

Best of Luck ;)

Going beyond technical skills:

Good soft skills are always valuable. A developer with average coding skills but great communication, time management, and relationship-building skills is more valuable to a company than someone with great technical skills who requires constant manager attention to get anything done.

Basic design skills and awareness are helpful. This doesn’t mean you need to be able to design the final app, but you should be able to create visually pleasing prototypes before the designers are done with the designs.