RapiPay Android Team Lead Interview Questions and Answers

Q1. Bloc, provider, widgets, listview vs listview.builder
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Q1. What is Bloc and its uses?
Ans. 
Bloc is a state management library for Flutter that helps manage the flow of data and events.
• Bloc stands for Business Logic Component.

• It helps separate the presentation layer from the business logic.

• Bloc is commonly used with Flutter to handle state management and data flow.

• It uses streams to handle asynchronous data and events.

• Bloc pattern consists of events, states, and a bloc class to handle the business logic.
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Q2. Different types of state management
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State management is a crucial aspect of app development to handle and update the state of the application.
• Local State Management: Managing state within a widget using setState() method.

• InheritedWidget: Sharing state across the widget tree using InheritedWidget.

• Provider: A popular state management solution that uses InheritedWidget under the hood.

• Redux: A predictable state container for managing the state of the app.

• Blo...read more
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Q3. What is stateless
Ans. 
Stateless refers to a widget in Flutter that does not have any mutable state.
• Stateless widgets are immutable and their properties cannot change once they are initialized.

• They are used for UI components that do not need to update or change based on user interactions.

• Examples include static text labels, icons, and buttons that do not change appearance.

• Stateless widgets are more efficient than stateful widgets as they do
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Q4. Lifecycle of stateful widget
Ans. 
Stateful widgets in Flutter have a lifecycle that includes various methods being called at different stages.
• Stateful widgets have methods like initState(), didChangeDependencies(), build(), and dispose() that are called at different points in the widget's lifecycle.

• initState() is called when the widget is inserted into the tree, didChangeDependencies() is called when the widget's dependencies change, build() is called ...read more
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Basic question based on MVVM Architecture

Android discussion, Services, MVVM, Coroutines

Q1. Discussion on Projects
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Q1. About the current company.
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Q2. Current and Expected CTC
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Q3. Total Years of Experience
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Q4. Relevant skills based on the JD
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He really helped me by telling me the topics and a few questions which the assigned interviewer usually asks.

The interview first ask me to open LEETCODE and gave me a HARD question about STACK - related to bracket question.

He first asked me to write the Pseudo code but I started writing proper code. After a period of time, I got stuck and he gave me a small hint I solved the question then he ask me to submit the code and it submitted successfully. This one question took 40 minutes. He didn't even ask me more questions, also he was yawning and it seemed like he was not interested at all. At the end of the interview, I asked him if he will ask more questions, and he said it is fine it was a hard and lengthy question.

The next day I got the rejection mail.

Android Assignment - Create an android project for a given scenario.

Q1. Questions related to Android & Kotlin
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Q1. Basic questions about activity lifecycle, fragments, and components.
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Q2. Questions about Kotlin extension functions, scoping functions, sealed classes, Coroutines
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Round duration - 180 Minutes
Round difficulty - Medium

Q1. Can you design a simple waste management app, given a mock server and some icons?
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Round duration - 45 minutes
Round difficulty - Medium

Basic DSA - Live coding
Happened on Sunday morning for 45 min. The interviewer is friendly.

Q1. 
Majority Element Problem Statement
Given an array/list 'ARR' consisting of 'N' integers, your task is to find the majority element in the array. If there is no majority element present, return -1.
Exampl...read more
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Q2. 
Find Row With Maximum 1's in a Sorted 2D Matrix
You are provided with a 2D matrix containing only the integers 0 or 1. The matrix has dimensions N x M, and each row is sorted in non-decreasing order. Your...read more
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Round duration - 45 Minutes
Round difficulty - Medium

Technical - Android Round

Round duration - 90 Minutes
Round difficulty - Medium

Taken by Engineering Head

Round duration - 15 Minutes
Round difficulty - Medium

Taken by VP