Round 1 – Online (Technical Discussion)

This was a ~30-minute discussion focused mostly on my background and fundamentals.

Topics covered:

• Resume deep dive

• Android architecture (MVVM, layers, etc.)

• Multi-module architecture

• Activity lifecycle

• Past achievements and challenges

• One DSA question: Max path sum in a binary tree

Verdict: ✅ Passed

Round 2 – Onsite (DSA + System Design)

This round mixed problem-solving with design thinking.

What was asked:

• Resume-related questions

• System Design: Design an offline-first homepage

• Follow-up questions on architecture decisions

• DSA: Longest Bitonic Subsequence

Verdict: ✅ Passed

Round 3 – Onsite (Android Core + System Design)

This was the most in-depth and challenging round. It focused heavily on core Android concepts and deep understanding.

Questions Covered

🔹 Android Fundamentals

• How does ViewModel survive configuration changes?

• How to persist data in Activity without ViewModel

• Activity lifecycle

• How to persist data in Fragments without ViewModel

• Design a login screen in Fragment and persist data without ViewModel

🔹 Fragment & Lifecycle

• Difference between viewLifecycleOwner and lifecycleOwner ❗

• What happens internally when using add, replace, addToBackStack

• What happens if addToBackStack is used before add/replace ❗

🔹 Performance & Stability

• How to identify and prevent ANRs

• How to identify and prevent crashes

🔹 Coroutines (Deep Dive)

• How coroutines work

• Benefits of coroutines

• Under-the-hood working

• How CPS (Continuation Passing Style) works

• Difference between SupervisorScope and ViewModelScope

• Coroutine lifecycle

🔹 Architecture & Design

• Data flow of API call using MVVM

• Dependency Injection concepts

• Jetpack Compose basics

Result: Failed in this round

The areas marked with ❗ were where the interviewer expected deeper, more internal-level explanations, and that’s where I couldn’t go deep enough.

Even though I didn’t clear the final round, this was a great learning experience.