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PubMatic Big Data Engineer Interview Questions, Process, and Tips

Updated 1 Aug 2024

PubMatic Big Data Engineer Interview Experiences

1 interview found

Interview experience
5
Excellent
Difficulty level
Moderate
Process Duration
2-4 weeks
Result
Selected Selected

I applied via Approached by Company and was interviewed in Jul 2024. There was 1 interview round.

Round 1 - Technical 

(5 Questions)

  • Q1. Pyspark optimizations and theoretical questions
  • Q2. Find the number of pairs which sum to target.
  • Ans. 

    Count pairs in an array that sum up to a target value.

    • Iterate through the array and store the frequency of each element in a hashmap.

    • For each element, check if the difference between the target and the element exists in the hashmap.

    • Increment the count of pairs if the difference is found in the hashmap.

  • Answered by AI
  • Q3. Binary search moderate problems of array ones increasing then decreasing
  • Ans. 

    Binary search can be used to solve moderate problems of arrays that are first increasing and then decreasing.

    • Use binary search to find the peak element in the array, which marks the transition from increasing to decreasing.

    • Divide the array into two parts based on the peak element and apply binary search on each part separately.

    • Handle edge cases such as when the array is strictly increasing or strictly decreasing.

    • Exampl

  • Answered by AI
  • Q4. System design for a web surfing utility
  • Ans. 

    Design a system for a web surfing utility

    • Use a web crawler to gather data from websites

    • Implement a search engine to retrieve relevant information

    • Utilize a recommendation system to suggest related content

    • Include user authentication and personalized settings

    • Ensure scalability and performance for handling large amounts of data

  • Answered by AI
  • Q5. Smallest subarray having given target sum
  • Ans. 

    Find the smallest subarray in an array that has a given target sum.

    • Use a sliding window approach to find the subarray with the target sum.

    • Keep track of the current sum of elements in the window and adjust the window size accordingly.

    • Start with a window of size 1 and expand it until the sum is greater than or equal to the target sum.

    • Shrink the window from the left side while updating the smallest subarray length until t

  • Answered by AI

Skills evaluated in this interview

Interview questions from similar companies

I applied via Campus Placement

Interview Questionnaire 

3 Questions

  • Q1. Tell me one thing about you that's not listed on your resume
  • Ans. 

    I am an avid traveler and have visited over 20 countries

    • I love experiencing new cultures and trying new foods

    • I have backpacked through Europe and Asia

    • I have volunteered in orphanages in Cambodia and Nepal

  • Answered by AI
  • Q2. When you hear InMobi, what's the first word that comes in your head?
  • Ans. 

    Mobile advertising platform

    • Adtech

    • Mobile marketing

    • App monetization

  • Answered by AI
  • Q3. The office of InMobi technologies has 10 floors, each with 300 employees. In the morning (7-8 AM), the building sees 3000 employees entering and waiting in a queue for 3 lifts. In the morning, everyone goe...

Interview Preparation Tips

Round: Resume Shortlist
Experience: The first round was a resume shortlist, which I think was on the basis of programming and coding courses (and projects) taken along with your CGPA. Out of 10 shortlisted people, I knew 4 and all of us were 9 pointers. The rest who I didn't know turned out to be 9 pointers as well! :P
Out of 10 shortlisted people, 3 (including me) were from ECE and the rest were from CS. Even though InMobi was open for Mathematics & Computing, no person from MnC dept. was in the shortlist. (Presumably due to their CGPAs or some other criterion that I'm not in the knowledge of.)
Tips: i) High CGPA is a must (We're talking above 9, at the end of 2nd year for CS/ECE and 3rd year for MnC)
ii)Taking programming and algorithm courses and projects is important, as that must be visible in your resume.

Round: Puzzle Interview
Experience: One special thing about the interviews, you're asked not to wear any formals! That actually helps in taking the tension off of things!
It's simple logic, after that. Increase the lift's speed (taking in mind of the safety), collecting usage data, optimising the lift's floor-stoppage according to that.
As told after the interview, the interviewer is just observing how you think and approach a problem.

One odd thing was not being asked about any coding/algorithm questions even though the profile was for a software engineer.

After this question, I was asked if I had any questions to ask. I simply stated that the work environment and culture affected me as much as the profile I'm applying for. Thus, the drive and motivation of the people who work there is also very important. So I asked what are the companies' values which the employees believe in, too.
Tips: Stay confident, don't let any tension get to your head.
In the future, InMobi may start asking coding questions too in the interviews. or change the selection procedure, which will be communicated in the PPT of InMobi.
Whatever may happen, the first round should show your zeal to solve problems, your creativity in trying different approaches, and applying logic to find the best solution.

Round: HR Interview
Experience: OK! There were a lot of questions asked since the interview was more like a conversation taking place. Like in ANY conversation, keep proper eye contact, smile and be approachable for any questions. Show enthusiasm in your voice and your answers. The interviewer asked me questions about
i)My resume, and all the activities that I'd listed there. (eg: Why did you enlist in this course? Do you like coding?)
ii)Why programming, how does it interest you?
iii)Basic questions about InMobi, like 'What do you know about us after attending the PPT?' and 'Why InMobi'

Since I had done quite a lot of marketing activities, I was also asked about that. Will you do an MBA in the future? What all did you do for marketing? I had a strong background in digital marketing, and we had a little chat about mobile marketing and what's the future of mobile advertising.
Tips: Smile, for god's sake! It's a conversation about you, do all the basic things to improve the conversational experience.
Small things like greeting the interviewer, smiling, proper eye contact, and speaking properly are paramount.

Like in any HR interview, make sure you know yourself and your resume properly, so that you don't phase out in the interview when asked some 'unexpected' question. (since that's when they know thatyou might be lying/exaggerating). Hence introspect enough before sitting the interviews.

General Tips: Make sure you're able to convince yourself and the interviewers for why do you want to work in Inmobi Technolgies.

I've already shared the rest in previous sections! :)

2 people out of 10 were selected for this internship experience, so make sure you prepare well! All the best! :D

Skill Tips: I don't think that this adds on as a skill, but InMobi wants to create a huge impact on the mobile world and the mobile advertising sector.
Your knowledge about this sector in general could help you strike good conversations (at least in the HR round).
Skills: Logic, Problem Solving Abilties, Creativity, Communication Skills
Duration: 2.5
College Name: IIT Kharagpur
Motivation: I'm a gadget geek from my childhood. The mobile industry amazes me as it's been the biggest change-bringer in the modern world. InMobi as a company wants to create a huge impact in the mobile advertising space and mobile advertising! And seeing their products that they offer in this domain had me thinking that they're doing something unique and awesome!
The work culture of InMobi is just amazing, right from flexible work hours to the epic office they have in Bangalore full of awesome people working towards that one goal! Also, InMobi offers their employees opportunities to shift between various verticals if they want to. All of this (along with a good compensation ;-) ) was enough motivation for me to apply!
Funny Moments: When I was asked whether I was in the third year, I said yes, and then said, usually people think that I'm still in high school!
We had a good laugh on that one! :P

Otherwise also, the entire procedure was relaxed and fun in general.

Interview Questionnaire 

9 Questions

  • Q1. Find Maximum sub sequence sum in an array ?
  • Ans. 

    Maximum sub sequence sum in an array

    • Use Kadane's algorithm

    • Initialize max_so_far and max_ending_here to 0

    • Iterate through the array and update max_ending_here and max_so_far

    • Return max_so_far

  • Answered by AI
  • Q2. What do you understand by the endianness of the system ? How do you find out the the type of endianness ?
  • Ans. 

    Endianness refers to the byte order of a system. It determines how multi-byte data types are stored in memory.

    • Little-endian systems store the least significant byte first, while big-endian systems store the most significant byte first.

    • Endianness can affect the way data is transmitted between systems.

    • To determine the endianness of a system, you can use the byte order mark (BOM) or write a test program that checks the by...

  • Answered by AI
  • Q3. Sort an array which consists of 0's and 1's only
  • Ans. 

    Sort an array of 0's and 1's only.

    • Use two pointers, one at the beginning and one at the end of the array.

    • Swap 0's from the beginning with 1's from the end until the pointers meet.

    • Alternatively, use a counting sort algorithm to count the number of 0's and 1's and then reconstruct the array.

  • Answered by AI
  • Q4. A question on applications of minimum spanning tree, apply prim's or kruskal's algorithm
  • Q5. What do you understand by Heaps, max and min heaps ?
  • Ans. 

    Heaps are data structures used to efficiently find the maximum or minimum element in a collection.

    • Max heap: parent nodes are always greater than or equal to child nodes

    • Min heap: parent nodes are always smaller than or equal to child nodes

    • Heaps are commonly used in priority queues and sorting algorithms

    • Heap operations include insert, delete, and extract max/min

    • Example: An array [3, 8, 2, 5, 1, 4, 6] can be represented a

  • Answered by AI
  • Q6. What do you understand by hashing ? questions on application of hashing
  • Q7. Find 3 nos a,b and c in an array where a+b = c
  • Ans. 

    Find 3 numbers in an array where a+b=c.

    • Loop through the array and check for all possible combinations of a and b.

    • Use a hash table to store the values of a and b, and check if c is present in the hash table.

    • Sort the array and use two pointers to find a and b, and then check if their sum equals c.

  • Answered by AI
  • Q8. Some puzzles, as the other interviewee said, but not asked to me
  • Q9. Questions on Dynamic programming

Interview Preparation Tips

College Name: NA

Skills evaluated in this interview

Interview Questionnaire 

3 Questions

  • Q1. Algorithms on arrays and strings (coding)
  • Ans. 

    Algorithms for manipulating arrays and strings in coding

    • Use sorting algorithms like quicksort and mergesort for arrays

    • Use string manipulation functions like substring and replace for strings

    • Use dynamic programming for optimizing solutions to array and string problems

  • Answered by AI
  • Q2. Distributed Database Design
  • Q3. Large scale Ad Server Design
  • Ans. 

    Designing a large scale Ad Server

    • Use distributed systems for scalability

    • Implement caching for faster ad delivery

    • Ensure high availability and fault tolerance

    • Use real-time bidding for efficient ad placement

    • Implement fraud detection mechanisms

    • Ensure compliance with privacy regulations

  • Answered by AI

Interview Preparation Tips

Round: Interview
Experience: They tested on thought-process during design problems. What problems are with the current solution I suggested and how to improve it...
Tips: Hints from interviewer are very helpful
Keep talking while you are thinking

Skills: Algorithms, Thinking Skills, Coding
College Name: IIT KHARAGPUR

Skills evaluated in this interview

Interview Preparation Tips

Round: Test
Experience: A coding test (Students were asked to bring Laptops)
Tips: Be thorough with C/C++, networking, OS, Data structures and architecture
Duration: 90 minutes

Round: Interview
Experience: 3 rounds of interview, one hour each, all technical 
Interview Process:All the three rounds are oriented around programming. A lot of focus was given to Data structures, C/C++, OS and algorithmsThe code from previous test is shown and they expect you to fix any bugs if thereThe interviewers are quietly friendly and help if you get stuck at any pointIf you do have any related projects, anticipate some thorough questions on that
Tips: Though the interviewers are helpful, get your basics clear early on. Don't rely on them.Practice coding sessions, a lot of companies have them as a shortlisting criteria.

College Name: IIT Madras

I applied via LinkedIn and was interviewed in Jan 2021. There were 5 interview rounds.

Interview Questionnaire 

2 Questions

  • Q1. I have been questioned on AEM Concepts, Sling Models, schedulers, servlets, OSGI services
  • Q2. Be prepared for most of the concepts in AEM

Interview Preparation Tips

Interview preparation tips for other job seekers - The overall interview experience was very good.

I applied via Naukri.com and was interviewed before May 2021. There were 4 interview rounds.

Round 1 - Aptitude Test 

It was mixed like aptitude and from technical.

Round 2 - Technical 

(1 Question)

  • Q1. It was F2F round. Where technical questions were asked.
Round 3 - One-on-one 

(1 Question)

  • Q1. Managerial round. It includes technical and managerial both
Round 4 - HR 

(1 Question)

  • Q1. HR round. It includes all the HR level questions

Interview Preparation Tips

Interview preparation tips for other job seekers - Just be prepared with your resume content what you have mentioned

I applied via Campus Placement and was interviewed before Jul 2021. There were 3 interview rounds.

Round 1 - Aptitude Test 

General aptitude test with math and logic related questions. there were also coding questions which were given more weightage than the other questions.

Round 2 - One-on-one 

(2 Questions)

  • Q1. Standard linked list questions like finding the middle of a linked list, checking if the linked list is a loop etc
  • Q2. Max heap related questions.
Round 3 - One-on-one 

(1 Question)

  • Q1. This interview was mostly math related questions. for eg: prove if a number is irrational.

Interview Preparation Tips

Topics to prepare for Amagi Media Labs Software Engineer interview:
  • Data Structures
  • Maths
  • puzzles
Interview preparation tips for other job seekers - focus is on checking basic coding and problem solving skills. a separate round for testing mathematical ability was a surprise.

I applied via Campus Placement and was interviewed before Aug 2021. There were 4 interview rounds.

Round 1 - Coding Test 

Coding cum aptitude test on Hackerrank

Round 2 - One-on-one 

(1 Question)

  • Q1. First round interview . Consisted questions based on projects , dsa
Round 3 - One-on-one 

(1 Question)

  • Q1. Round 2 . Question based from core technology. Micro services , etc
Round 4 - HR 

(1 Question)

  • Q1. Basic hr questions . Why are you fit for this role kind of things

Interview Preparation Tips

Interview preparation tips for other job seekers - Medium level interview rounds. Basic knowledge in dsa will be of a great help

Interview Questionnaire 

1 Question

  • Q1. What type of products are there ?
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PubMatic Interview FAQs

How many rounds are there in PubMatic Big Data Engineer interview?
PubMatic interview process usually has 1 rounds. The most common rounds in the PubMatic interview process are Technical.
What are the top questions asked in PubMatic Big Data Engineer interview?

Some of the top questions asked at the PubMatic Big Data Engineer interview -

  1. find the number of pairs which sum to targ...read more
  2. Binary search moderate problems of array ones increasing then decreas...read more
  3. smallest subarray having given target ...read more

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PubMatic Big Data Engineer Interview Process

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Interview experience

5
  
Excellent
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