JustDial SQL Developer Interview Questions and Answers

The first round comprised of 4 sections online questions including aptitude, logical, Coding questions, and technical portions (Test Duration: 90 mins):

Debugging: We had to choose a language and debug up to 7 questions most probably. Codes were very basic like sorting, etc. I completed 6 of them.

Coding: There were two medium-hard level questions.

Work-style Assessment: Just try to answer as an ideal employee. Make sure you answers don’t contradict each other.

Aptitude: Around 25 questions.

Q1. Find diameter of tree
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Q2. Count inversion
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Q1. Find n’th node from the end of a Linked List
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Q2. Find shortest distance between 2 points in a matrix, where 2 points can be anywhere
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More focus on dp,graphs.

Q1. Focus on backend concepts,routing.
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Q2. Question on flood fill algo,backtracking.
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My mostly question were around node js frame works and other tools

Q1. Case study for the question asked
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Q2. Tell me something more about you
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Q1. Questions on optimizations
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Q2. Question on React Js
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Medium level DSA question in JS

Percentage, time and work , others any questions

Graphs ,arrays , Hashmaps and Heaps

Q1. Graphs related dfs
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Q2. Changes on graph structure
Ans. 
Changes on graph structure involve adding, removing, or modifying nodes and edges.
• Adding a new node to the graph

• Removing an existing node from the graph

• Modifying the weight of an edge in the graph
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Q1. MVVM architecture
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Q2. Draw architecture design pattern
Ans. 
MVC (Model-View-Controller) architecture design pattern separates an application into three main components.
• Model: Represents the data and business logic of the application

• View: Represents the UI components of the application

• Controller: Acts as an intermediary between Model and View, handling user input and updating the Model accordingly
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Q1. Build system for Tiny URL
Ans. 
Build a system for generating and managing Tiny URLs
• Use a unique identifier for each long URL to generate a short URL

• Store the mapping of short URL to long URL in a database

• Implement a redirect mechanism to redirect users from short URL to long URL

• Consider adding expiration dates for short URLs to manage storage

• Implement analytics to track usage of short URLs
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