Ola Cabs Sdet Lead Interview Questions and Answers

Q1. Medium level problem solving questions were asked which was basically related to string and arrays, DS
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Puzzles aptitude check

Puzzles syntax check

Q1. Selenium,Rest assured ,API,java
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Coding conecpt, apti

Q1. Basic dsa, puzzles
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Q1. Basic dsa, dbms
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Very Easy questions just do it

Q1. What is your introduction
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Q2. Why SDE 1 only not SDE 2
Ans. 
SDE 1 is an entry-level position where candidates gain foundational skills before advancing to SDE 2.
• SDE 1 focuses on learning and building foundational skills in software development.

• SDE 2 requires more experience and expertise in software development.

• Advancing from SDE 1 to SDE 2 is a common career progression in tech companies.

• SDE 1 roles often involve working on smaller projects or components of larger projects.

• SDE...read more
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Q3. If bully happens will you bully someone
Ans. 
No, I believe in standing up against bullying and supporting those who are being bullied.
• I do not support bullying in any form and believe in treating others with respect and kindness.

• I would try to intervene and help the person being bullied, either by talking to the bully or seeking help from a teacher or supervisor.

• I believe in creating a positive and inclusive environment where everyone feels safe and respected.
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Q4. If taken leave can you work 7 days a week
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Round duration - 60 minutes
Round difficulty - Medium

1 Medium/Easy DSA questions were asked similar to Leetcode.

I was expected to come up with the most optimal solution for the same. I completed the code and explained in 45 mins.

In the remaining time, I was asked questions from Computer Science fundamentals and Java

Q1. Unique Element In Sorted Array
Nobita wants to impress Shizuka by guessing her lucky number.
Shizuka gave Nobita a sorted list of ‘N’ numbers such that every number occurred twice in the list except Shiz...read more
Ans. 
As the array was sorted we can make use of this information to use Binary Search.


// EXPLANATION:-
// Suppose array is [1, 1, 2, 2, 3, 3, 4, 5, 5]
// we can observe that for each pair, 
// first element takes even position and second element takes odd position
// for example, 1 is appeared as a pair,
// so it takes 0 and 1 positions. similarly for all the pairs also.

// this pattern will be missed when single element is ...read more
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Round duration - 60 minutes
Round difficulty - Easy

Low-level system design round. 
Expected to come up with a running code.

Q1. LRU Cache
Design and implement a data structure for Least Recently Used (LRU) cache to support the following operations:
1. get(key) - Return ...read more
Ans. 
Tip 1 : Ask clarification questions
Tip 2 : Try and think in terms of brute force and then gradually optimize your solution
Tip 3 : Ensure to check for edge cases
Tip 4 : Ensure to be thorough with data structures, algorithms and system design concepts.
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Round duration - 30 minutes
Round difficulty - Easy

Standard behavioural questions by HR

Q1. Basic HR Question
The hiring manager was asking about my past work experiences and past projects in my previous company.
Ans. 
Ensure that you are thorough with the design of your project at your current organization.
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Q1. Data structure related question
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Q1. Nodejs related questions
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Q2. Promises Async Await Events emitter
Ans. 
Promises, async/await, and event emitters are all ways to handle asynchronous operations in JavaScript.
• Promises provide a way to handle asynchronous operations by returning a promise object that can be resolved or rejected.

• Async/await is a syntax for working with promises that makes code easier to read and write.

• Event emitters allow you to create custom events that can be triggered and listened for in your code.
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Q1. System design related question
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Q2. Design a system like facebook
Ans. 
Design a system like Facebook
• Create a user registration and login system

• Implement a news feed for users to see updates from friends

• Allow users to create and join groups

• Include features like messaging, commenting, and liking posts

• Implement privacy settings for users to control who can see their content
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Q1. System design and behavioral
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2 Coding questions both easy-medium level.
1. Based on the Sliding Window
2. Graph Question

A simple feed platform, which supports some basic functionality. The main point of this round was to see how well a candidate architect the application.

Q1. Basic discussion around the project & past experience.
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Q2. Design a 2/3rd Winning game.
Ans. 
Design a 2/3rd Winning game.
• The game should have a clear win condition

• The win condition should be achievable in 2/3rd of the total game time

• The game should have a balanced difficulty level

• The game should have a clear feedback system for the player

• Examples: Chess, Tic Tac Toe, Connect Four
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Q3. Discussion around how would you scale a application.
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Q4. NoSQL vs SQL difference
Ans. 
NoSQL is non-relational and schema-less while SQL is relational and has a fixed schema.
• NoSQL databases are horizontally scalable and can handle large amounts of unstructured data.

• SQL databases are vertically scalable and are better suited for structured data with complex relationships.

• NoSQL databases are often used in web applications, while SQL databases are commonly used in enterprise applications.

• Examples of NoSQL d...read more
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Q1. Hiring Manager round
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Q2. Basic discussions around past work, past processes, what are your future aspirations etc.
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Q3. This round was mainly for seeing the culture fitment of a candidate.
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