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Disney+ Hotstar Full Stack Developer Interview Questions, Process, and Tips

Updated 25 Jan 2022

Disney+ Hotstar Full Stack Developer Interview Experiences

1 interview found

I was interviewed in Sep 2021.

Round 1 - Video Call 

(2 Questions)

Round duration - 60 minutes
Round difficulty - Medium

It was Data Structures plus computer fundamentals round.

  • Q1. 

    LRU Cache Design Question

    Design a data structure for a Least Recently Used (LRU) cache that supports the following operations:

    1. get(key) - Return the value of the key if it exists in the cache; otherw...

  • Ans. 

    Design a Least Recently Used (LRU) cache data structure that supports get and put operations with a given capacity.

    • Implement a doubly linked list to keep track of the order of keys based on their recent usage.

    • Use a hashmap to store key-value pairs for quick access and updates.

    • When capacity is reached, evict the least recently used item before inserting a new item.

    • Update the position of a key in the linked list whenever

  • Answered by AI
  • Q2. Can you explain the concepts of Mutex and Semaphore in operating systems?
  • Ans. 

    Mutex and Semaphore are synchronization mechanisms used in operating systems to control access to shared resources.

    • Mutex is used to provide mutual exclusion, allowing only one thread to access a resource at a time.

    • Semaphore is used to control access to a resource by multiple threads, with a specified number of permits available.

    • Mutex is binary in nature (locked or unlocked), while Semaphore can have a count greater tha...

  • Answered by AI
Round 2 - Face to Face 

(2 Questions)

Round duration - 60 minutes
Round difficulty - Medium

Had some coding questions. Asked me about my projects. What is html. What is dom and how do we manipulate it.

  • Q1. 

    Next Greater Element Problem Statement

    Given a list of integers of size N, your task is to determine the Next Greater Element (NGE) for every element. The Next Greater Element for an element X is the firs...

  • Ans. 

    The task is to find the Next Greater Element for each element in a list of integers.

    • Iterate through the list of integers from right to left.

    • Use a stack to keep track of elements whose NGE is yet to be found.

    • Pop elements from the stack until a greater element is found or the stack is empty.

    • Assign the NGE as the top element of the stack or -1 if the stack is empty.

  • Answered by AI
  • Q2. 

    Find the Row with the Maximum Number of 1's

    You are given a non-empty grid MAT with 'N' rows and 'M' columns, where each element is either 0 or 1. All rows are sorted in ascending order.

    Your task is to ...

  • Ans. 

    Find the row with the maximum number of 1's in a grid of 0's and 1's, returning the index of the row with the most 1's.

    • Iterate through each row of the grid and count the number of 1's in each row

    • Keep track of the row index with the maximum number of 1's seen so far

    • Return the index of the row with the maximum number of 1's

  • Answered by AI
Round 3 - Video Call 

Round duration - 60 minutes
Round difficulty - Medium

Interview with Engineering Manager

Interview Preparation Tips

Professional and academic backgroundI applied for the job as Fullstack Developer in BangaloreEligibility criteria2021 Graduates, 7 CGPADisney + Hotstar interview preparation:Topics to prepare for the interview - Tree, DP, OS, DBMS, Computer Networks, Data StructuresTime required to prepare for the interview - 2 MonthsInterview preparation tips for other job seekers

Tip 1 : Practice from Leetcode, solve Leetcode medium level problems.
Tip 2 : Brush up computer fundamentals from subjects like OS, DBMS and CN.
Tip 3 : Have a good project or good internship experience and have in-depth knowledge regarding what you have done.

Application resume tips for other job seekers

Tip 1 : Have at least one good internship as preference were given to people having some experience.
Tip 2 : Mention your achievements (Competitive Coding, ICPC, GSOC) and some projects or open source experience.

Final outcome of the interviewSelected

Skills evaluated in this interview

Interview questions from similar companies

I was interviewed before Apr 2021.

Round 1 - Telephonic Call 

(2 Questions)

Round duration - 45 Minutes
Round difficulty - Medium

It was in the mid day and since I applied for a Frontend role the discussion was majorly around data structure and bit of Javascript.
The interviewer was helping and good listener.

  • Q1. 

    Merge Two Sorted Linked Lists Problem Statement

    You are provided with two sorted linked lists. Your task is to merge them into a single sorted linked list and return the head of the combined linked list.

    ...
  • Ans. 

    Merge two sorted linked lists into a single sorted linked list without using additional space.

    • Create a dummy node to start the merged list

    • Compare the values of the two linked lists and add the smaller value to the merged list

    • Move the pointer of the merged list and the pointer of the smaller value list

    • Continue this process until one of the lists is fully traversed

    • Append the remaining elements of the other list to the me

  • Answered by AI
  • Q2. 

    Sort 0 1 2 Problem Statement

    Given an integer array arr of size 'N' containing only 0s, 1s, and 2s, write an algorithm to sort the array.

    Input:

    The first line contains an integer 'T' representing the n...
  • Ans. 

    Sort an array of 0s, 1s, and 2s in linear time complexity.

    • Use three pointers to keep track of 0s, 1s, and 2s while traversing the array.

    • Swap elements based on the values encountered to sort the array in-place.

    • Time complexity should be O(N) and space complexity should be O(1).

  • Answered by AI
Round 2 - Face to Face 

(3 Questions)

Round duration - 60 Minutes
Round difficulty - Medium

It was more of a in depth round on the framework I'm working on and problem solving.

  • Q1. What is the event loop and what is its significance?
  • Ans. 

    The event loop is a mechanism in programming that allows for asynchronous execution of code.

    • The event loop is a key component in JavaScript's runtime environment, responsible for handling asynchronous operations.

    • It continuously checks the call stack for any pending tasks and executes them in a non-blocking manner.

    • The event loop ensures that the program remains responsive by allowing other code to run while waiting for ...

  • Answered by AI
  • Q2. Can you provide examples of output-based questions in JavaScript that utilize browser APIs?
  • Ans. 

    Output-based questions in JavaScript using browser APIs

    • Example 1: Write a script that uses the Geolocation API to display the user's current location on a map

    • Example 2: Create a program that uses the Web Audio API to play a sound when a button is clicked

    • Example 3: Develop a web page that uses the Canvas API to draw a simple animation

  • Answered by AI
  • Q3. How would you design a system to support localization in a mobile app?
  • Ans. 

    Designing a system to support localization in a mobile app

    • Use resource files to store localized strings for different languages

    • Implement a language selection feature for users to choose their preferred language

    • Utilize localization libraries or frameworks to streamline the process

    • Consider cultural differences when localizing content, such as date formats and currency symbols

  • Answered by AI
Round 3 - Face to Face 

(3 Questions)

Round duration - 75 Minutes
Round difficulty - Hard

It was more of a fitment/managerial round.
Didn't had any coding questions, but was asked more on approaches and optimisations.
Discussions on the project you have worked on.

  • Q1. You need to find the fastest 3 horses out of a group, given that you can only race 5 horses at a time. How would you approach this problem?
  • Ans. 

    To find the fastest 3 horses out of a group with 5 horses racing at a time, we can use a tournament style approach.

    • Divide the horses into groups of 5 and race them against each other. This will give you the fastest horse in each group.

    • Take the winners from each group and race them against each other. The top 3 horses in this final race will be the fastest 3 overall.

    • Keep track of the results and compare the timings to d

  • Answered by AI
  • Q2. How do you debug the root cause of lag on a screen?
  • Ans. 

    To debug lag on a screen, analyze code, check for memory leaks, optimize rendering, and use profiling tools.

    • Analyze code to identify any inefficient algorithms or operations causing lag.

    • Check for memory leaks that could be impacting performance.

    • Optimize rendering by reducing the number of draw calls, optimizing shaders, and minimizing overdraw.

    • Use profiling tools like Xcode Instruments or Android Profiler to identify p

  • Answered by AI
  • Q3. Can you explain the architecture of the app you have recently worked on?
  • Ans. 

    The app I recently worked on is a social media platform for sharing photos and connecting with friends.

    • The app follows a client-server architecture, with the client being the mobile app and the server handling data storage and processing.

    • The client side is built using React Native for cross-platform compatibility.

    • The server side is implemented using Node.js with a MongoDB database for storing user data and photos.

    • The a...

  • Answered by AI

Interview Preparation Tips

Professional and academic backgroundI applied for the job as SDE - 1 in GurgaonEligibility criteriaNo criteriaCars24 interview preparation:Topics to prepare for the interview - Data Structures Algorithms, Javascript, System DesignTime required to prepare for the interview - 1 MonthInterview preparation tips for other job seekers

Tip 1 : Get your JS fundamentals right (if applying for a Frontend role, https://javascript.info/ is a good start)
Tip 2 : Apart from preparing data structures, practise on the communication skills as well (prepare your introduction, be a good listener and on spot improvisation plays key roles)

Application resume tips for other job seekers

Tip 1 : highlight projects related to the job profile in your resume and mention what was your contribution in them precisely in 1/2 lines.
Tip 2 : Include URLs to applications/projects that you have build and your achievements/blog (if any)

Final outcome of the interviewSelected

Skills evaluated in this interview

Interview experience
3
Average
Difficulty level
Moderate
Process Duration
Less than 2 weeks
Result
Selected Selected

I applied via Campus Placement and was interviewed before Apr 2023. There were 3 interview rounds.

Round 1 - Coding Test 

2 questions Medium Leetcode

Round 2 - Technical 

(4 Questions)

  • Q1. Questions around basic-easy DSA, operating system, project discussion (not in deep)
  • Q2. Binary Search Related
  • Q3. Sorting(Merge Sort)
  • Q4. Threads and Process
Round 3 - HR 

(1 Question)

  • Q1. Puzzles and Project and HR questions

Interview Preparation Tips

Interview preparation tips for other job seekers - Medium Leetcode is enough, operating system and project knowledge
Interview experience
4
Good
Difficulty level
Moderate
Process Duration
2-4 weeks
Result
No response

I applied via Referral and was interviewed in Mar 2024. There were 3 interview rounds.

Round 1 - Coding Test 

There were 2 questions.
1. Knapsack
2. Median in an array

Round 2 - One-on-one 

(1 Question)

  • Q1. LLD(machine coding) of Google meet
Round 3 - One-on-one 

(1 Question)

  • Q1. In depth discussion on my projects and resume
Interview experience
2
Poor
Difficulty level
-
Process Duration
-
Result
-
Round 1 - Technical 

(2 Questions)

  • Q1. Implement an immutable class.
  • Ans. 

    An immutable class is a class whose instances cannot be modified after creation.

    • Use final keyword for class declaration to prevent inheritance

    • Make all fields private and final to prevent modification

    • Do not provide setter methods, only getter methods should be used

  • Answered by AI
  • Q2. Implement a springboot service that intercepts http requests.
  • Ans. 

    Implement a Springboot service to intercept HTTP requests.

    • Create a Springboot application with necessary dependencies.

    • Implement a custom interceptor by extending HandlerInterceptorAdapter.

    • Override preHandle and postHandle methods to intercept requests and responses.

    • Register the interceptor in the WebMvcConfigurerAdapter configuration class.

  • Answered by AI

Skills evaluated in this interview

Interview experience
3
Average
Difficulty level
-
Process Duration
-
Result
-
Round 1 - Resume Shortlist 
Pro Tip by AmbitionBox:
Keep your resume crisp and to the point. A recruiter looks at your resume for an average of 6 seconds, make sure to leave the best impression.
View all Resume tips
Round 2 - Technical 

(2 Questions)

  • Q1. Implementation of LRU cache
  • Ans. 

    LRU cache is a data structure that stores the most recently used items, discarding the least recently used items when full.

    • Use a doubly linked list to keep track of the order of items based on their usage.

    • Use a hash map to quickly access items in the cache.

    • When a new item is accessed, move it to the front of the linked list. If the cache is full, remove the item at the end of the list.

  • Answered by AI
  • Q2. Implementation of HashMap
  • Ans. 

    HashMap is a data structure that stores key-value pairs and allows for fast retrieval of values based on keys.

    • HashMap is implemented using an array of linked lists or a balanced tree to handle collisions.

    • It uses a hash function to map keys to indices in the array.

    • Example: HashMap map = new HashMap<>(); map.put("key", 123); int value = map.get("key");

  • Answered by AI

Skills evaluated in this interview

Interview experience
4
Good
Difficulty level
Moderate
Process Duration
Less than 2 weeks
Result
Not Selected

I applied via Job Portal and was interviewed in May 2024. There was 1 interview round.

Round 1 - Coding Test 

Dsa question based on dp

Interview experience
5
Excellent
Difficulty level
Moderate
Process Duration
Less than 2 weeks
Result
Not Selected

I applied via Campus Placement and was interviewed in Aug 2024. There were 2 interview rounds.

Round 1 - Coding Test 

3 coding question
2 medium 1 hard

Round 2 - Technical 

(2 Questions)

  • Q1. Online polling system based on OOPs
  • Q2. Explaining the above code
Interview experience
4
Good
Difficulty level
Hard
Process Duration
Less than 2 weeks
Result
Not Selected

I applied via Campus Placement and was interviewed in Aug 2024. There were 2 interview rounds.

Round 1 - Coding Test 

3 Medium level dsa questions

Round 2 - One-on-one 

(2 Questions)

  • Q1. Lld of cab booking system
  • Ans. 

    The Low Level Design (LLD) of a cab booking system involves detailing the system architecture and components at a lower level of abstraction.

    • Identify the main components of the system such as user interface, booking engine, payment gateway, and driver allocation algorithm.

    • Define the interactions between these components and how data flows between them.

    • Specify the data structures and algorithms used for efficient bookin...

  • Answered by AI
  • Q2. Discussion about online assesment

Interview Preparation Tips

Interview preparation tips for other job seekers - Prepare for machine coding rounds.

Skills evaluated in this interview

Interview experience
5
Excellent
Difficulty level
Moderate
Process Duration
Less than 2 weeks
Result
Not Selected

I applied via Campus Placement and was interviewed in May 2024. There were 2 interview rounds.

Round 1 - Coding Test 

2 medium - question 1 array and 1 dp
1 med to hard - dynamic programming

Round 2 - Technical 

(2 Questions)

  • Q1. System design LLD - Polling System
  • Q2. How to implement Concurrency in it.
  • Ans. 

    Concurrency in software development allows multiple tasks to run simultaneously, improving performance and responsiveness.

    • Use multithreading to execute multiple tasks concurrently

    • Implement asynchronous programming to handle tasks that may take longer to complete

    • Use synchronization techniques like locks and semaphores to manage access to shared resources

    • Consider using thread pools to manage and reuse threads efficiently

  • Answered by AI
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