Customize Element App Branding & Theme

I'm looking for a skilled developer to customize the branding and theme of the Element web and Android app. The primary focus is to change the logo and text to create a custom-branded experience with a black and white theme.

Key Requirements:
- Update the logo on the login screen for both web and Android app
- Change the welcome message on the login screen (specific message will be provided)
- Implement a cohesive black and white theme throughout the app

Ideal Skills and Experience:
- Experience with web and Android app development
- Proficiency in UI/UX design, particularly in theme customization
- Strong attention to detail in branding and visual consistency
- Ability to work with provided assets and instructions

Please ensure that the final product reflects the desired custom branding and theme changes.