I recently got the opportunity to interview for the SDE Android Intern role at Groww.

I had applied through a Google Form on 13th May 2025, and on 25th June 2025, I received an assignment to build a stock display app using Kotlin (everyone who applied received the same assignment). I submitted it on 4th July 2025, and got an interview call from HR on 22nd July 2025.

During the interview, most of the discussion revolved around the assignment. I began by explaining the app, its architecture, and why I chose the MVVM pattern with Repository. I was asked:
• What is MVVM architecture?
• What happens when the user rotates the screen?
• What are lambda functions and their use cases?
• How did I implement the bottom navigation bar?
• What is dependency injection?
• How does my ViewModel help retain data across screen rotations?
• What is the Activity lifecycle?

I was also given a scenario:
If a screen shows a RecyclerView with payment options like PhonePe and Cash on Delivery, how would I ensure that only one card is selected at a time? I had to explain how I would manage selection and persist the user’s choice.

There were also several questions around data handling. I explained that I implemented caching — if data is in the cache, I use it; otherwise, I make an API call. I was asked where I handled the logic to validate the cache and how I structured my API calls.

The interviewer also asked me about the numbers mentioned in my resume — how I calculated them and what they represented.

There were some Kotlin-specific questions too:
• What is a data class?
• Can a data class be empty?
• How is it different from a regular class?

In terms of feedback, I was told that I could have gone deeper into how things actually work under the hood, which is something I’ll definitely work on moving forward.

Although I wasn’t selected (HR informed me the next day), it was a valuable learning experience.

I’m sharing this because while preparing for my interview, I struggled to find real Android interview experiences online.
Hopefully, this helps someone else who’s preparing for theirs.