What are some good resources for learning Mobile System design?

I'd recommend this easy-to-read book to understand how to build an app at scale, written by an Uber Engineer: 'Building Mobile Apps at Scale' https://www.amazon.com/Building-Mobile-Apps-Scale-Engineering/dp/1638778868.

Unfortunately, I couldn't find any detailed System Design course for Android, but I could share some resources that I found here and there and compiled them together:

• General guidlines:
  • https://github.com/weeeBox/mobile-system-design
  • https://proandroiddev.com/a-simple-framework-for-mobile-system-design-interviews-89f6f4134b84
• Mock System Design Interviews: https://www.youtube.com/@alementuev The feedback part at the end is enlightening.
• Instagram Android Engineering: https://instagram-engineering.com/tagged/android
• Uber Android System Design: https://www.youtube.com/watch?v=SbXDhAKgWek
• Modern Android App Architecture (very important): https://developer.android.com/courses/pathways/android-architecture

Here are topic specific links that I found very useful

• Pagination: https://nordicapis.com/everything-you-need-to-know-about-api-pagination/ https://uxdesign.cc/why-facebook-says-cursor-pagination-is-the-greatest-d6b98d86b6c0
• Web Sockets: https://ably.com/topic/websockets
• Build for Billions (very important if you are interviewing for a big tech company): https://developer.android.com/docs/quality-guidelines/build-for-billions
• Memory: https://developer.android.com/topic/performance/memory-overview

To ace any Mobile System Design interview, these are the topics I recommend studying and finding examples for:

• Networking and communication protocols (REST, WebSockets, Server-Sent Events, Push Notifications, etc.)
• Storage (Relational Database, Key-based, Shared Preferences)
• Data Management (Offline storage, Caching, Pre-fetching data, Persistent/In-memory storage, Services/Work Manager)
• Feature Development (Modularization, Dependency Injection, Testing, Accessibility)
• Image caching (very important if you are interviewing at companies like Meta, TikTok and Snapchat)
• Privacy and Security

Try to find pros and cons for the following and come up with why would you go with the one over the other

• MVVM vs MVC vs MVP vs MVI design pattern
• Single Activity vs Multi-Activity architecture pattern
• Different app modularization techniques
• Push-based vs pull-based database synchronization
• In-memory storage vs persistent storage
• XML vs Compose

App scalability topics (Important for apps with billions of users)

• Battery consumption
• Building for different network bandwidth
• Accessibility
• Localization
• App profiling (CPU, Network and Battery profiling)

This is my approach while tacking an Android System Design problem:

• What are we building (Client app, ApI, BE or both (client plus BE))
• Whom are we building this for (target users, target market, etc)
• Functional Requirements
• Non-functional requirements
• Defining the basic principles on how the app would get data and the APIs
• Defining the app architecture
• Deep diving in any of the feature
• Scalability

Mindset that help me build an end to end system: Thinking as if I am using the app and coming up with different scenarios and then discussing possible solution like

• What happens when the user goes on an airplane mode?
• What happens when the user removes the app from the background and then starts it again?
• What happens when the user uninstalls the app and re-installs it?
• What happens when a call or an alarm interrupts the app?

There is a lot that I could talk and I'd really be interested in taking a session if anybody is interested.

Hope this helps. Thank you!