Mobile Apps (iOS & Android) Code Refactor & Crashlytics Migration

I have 4 iOS (Swift) and 3 Android (Java) apps that need some updates and fixes.

Key Tasks:
- Remove Fabric and migrate Crashlytics to Firebase Crashlytics
- Migrate several minor deprecated pods or code
- Format code with swift-format & Android Studio
- Rename the package names
- Apply a uniform black colour scheme across the entire app

I require the entire app to adopt a black colour scheme. Firebase is already set up for both iOS and Android. The task primarily involves addressing several minor deprecated code libraries.

Ideal skills for this job include:
- Proficiency in Swift and Java
- Experience with Firebase and Crashlytics
- Familiarity with swift-format and Android Studio
- Understanding of app design and colour schemes

The project must be completed within 2 weeks.