200+ Practo Interview Questions & Answers | Complete Prep Guide 2025

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Software Developer Interview Questions & Answers

Anonymous

posted on 9 May 2015

Interview Questionnaire

9 Questions

Q1. What is event bubbling?

Ans.

Event bubbling is the propagation of an event from the innermost child element to the outermost parent element.

Events triggered on a child element will also trigger on its parent elements
The event travels up the DOM tree until it reaches the document object
Can be stopped using event.stopPropagation()
Can be useful for event delegation

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Q2. Difference between .on(‘click’,function() and .click(function())

Ans.

The .on('click',function() is a more flexible method than .click(function())

The .on() method can handle multiple events and selectors
The .click() method can only handle one event and one selector
The .on() method can also handle dynamically added elements
The .click() method cannot handle dynamically added elements

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Q3. Write a function to check if two strings are anagram or not

Ans.

Function to check if two strings are anagram or not

Create two character arrays from the strings
Sort the arrays
Compare the sorted arrays

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Q4. Given an array of integers which can be in one of four order – i.Increasing 2.Decreasing 3.decreasing then increasing 4.increasing then decreasing .Write a function to find the type of array

Ans.

Function to determine the order of integers in an array.

Check first and last element to determine if increasing or decreasing
Check for inflection point to determine if order changes
Return order type as string

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Q5. How can you improve the performance of a site.(Only frontend)

Ans.

Optimize images, minify code, reduce HTTP requests, use caching, and lazy loading.

Optimize images using compression and appropriate file formats
Minify code to reduce file size and improve load times
Reduce HTTP requests by combining files and using sprites
Use caching to store frequently accessed data locally
Implement lazy loading to defer loading of non-critical resources

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Q6. Design database schema for a movie site.Where user can watch the movie,genre of movie,give ratings and recommended movies to user.Also Write an algorithm to show recommended movies to user

Ans.

Design a database schema for a movie site with user ratings and recommendations.

Create tables for movies, users, ratings, and recommendations
Use foreign keys to link tables
Include columns for movie genre and user watch history
Algorithm for recommendations can use user watch history and ratings to suggest similar movies

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Q7. By tossing a coin we can get either head or tail, i have a function toss() which return head or tail with equal probability

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Q8. You have to write a function for dice which will return number from 1-6 with equal probability. constraints : you can not use random function, you can use only toss function

Ans.

Function to simulate dice roll with equal probability without using random function

Use a toss function that returns either 0 or 1 with equal probability
Call the toss function 3 times and convert the result to a binary number
If the binary number is greater than 0 and less than or equal to 6, return it
If the binary number is greater than 6, repeat the process

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Q9. Write a query to fetch duplicate email from table?

Ans.

Query to fetch duplicate email from table

Use GROUP BY and HAVING clause to filter out duplicates
SELECT email, COUNT(*) FROM table_name GROUP BY email HAVING COUNT(*) > 1;
This will return all the duplicate emails in the table

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Interview Preparation Tips

Skills: data structure, Algorithm
College Name: na
Motivation: Practo is the market leader in digital healthcare management with millions of consumers using our products to find doctors, book appointments and manage their healthcare efficiently. Practo Ray is the platform of choice for the vast majority of doctors and clinics deploying cloud based clinic management solution.I recently got an offer from Practo, here is my interview experience:

Skills evaluated in this interview

Software Developer Interview Questions asked at other Companies

Q1. Maximum Subarray Sum Problem Statement Given an array of integers, determine the maximum possible sum of any contiguous subarray within the array. Example: Input: array = [34, -50, 42, 14, -5, 86] Output: 137 Explanation: The maximum sum is... read more

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Senior Android Developer Interview Questions & Answers

Anonymous

posted on 21 Jun 2024

Interview experience

Good

Difficulty level

Moderate

Process Duration

Less than 2 weeks

Result

Selected

I applied via Approached by Company and was interviewed in May 2024. There were 4 interview rounds.

Round 1 - Coding Test

It was a 1.5-hour coding test. We were given three DSA questions to solve. Two of them were Easy to Medium problems and the third one was Medium to Hard question.

Round 2 - Technical

(6 Questions)

Q1. Kotlin interview questions what you'll find in medium posts. (Medium diff)

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Q2. Android Interview Questions that you'll find the medium posts. (Medium Diff)

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Q3. SOLID principle

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Q4. DSA 1 (Whiteboard): A two-pointer array question.

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Q5. DSA 2 (Whiteboard): Leetcode jump-game question

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Q6. Followup on space and time complexity and improvements.

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Round 3 - System Design

(1 Question)

Q1. Design a video streaming app's search page

Ans.

The search page of a video streaming app should allow users to easily search for and discover content.

Include a search bar at the top for users to enter keywords or phrases
Display relevant search results in a grid or list format
Provide filters or sorting options to refine search results
Include thumbnails, titles, and brief descriptions of the search results
Allow users to click on search results to view more details or

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Round 4 - Behavioral