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CleverTap Back End Engineer Interview Questions and Answers
CleverTap Back End Engineer Interview Experiences
2 interviews found
Anonymous
2 pointer and Hashing
(1 Question)
- Q1. Sorting, DP and Graph
(1 Question)
- Q1. Design a simple LRU cache
- Ans.
LRU cache is a data structure that stores a fixed number of items and removes the least recently used item when full.
Use a doubly linked list to keep track of the order of items based on their usage.
Use a hashmap to quickly access items in the cache.
When an item is accessed, move it to the front of the linked list to mark it as the most recently used.
When adding a new item, check if the cache is full and remove the lea...
Interview Preparation Tips
Skills evaluated in this interview
Selected
I was interviewed before Oct 2023.
It was a simple time/space complexity trade-off OA
(2 Questions)
- Q1. LRU Cache Design & coding
- Q2. HTTP status codes, AtomicInteger, Why LinkedHashMap over HashMap
Interview Preparation Tips
Top trending discussions
Interview questions from similar companies
Interview Questionnaire
1 Question
- Q1. Strings, arrays, dp
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
- 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
Interview Preparation Tips
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
Anshul Gupta
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
- Q2. When you hear InMobi, what's the first word that comes in your head?
- Ans.
Mobile advertising platform
Adtech
Mobile marketing
App monetization
- 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
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
- 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...
- 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.
- 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
- 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.
- Q8. Some puzzles, as the other interviewee said, but not asked to me
- Q9. Questions on Dynamic programming
Interview Preparation Tips
Skills evaluated in this interview
I applied via Referral
Interview Questionnaire
1 Question
- Q1. Ds related questions
Interview Preparation Tips
Selected
I applied via Campus Placement and was interviewed before May 2022. There were 3 interview rounds.
4 questions on Data Structure .
Online Mode
(1 Question)
- Q1. Core Java , Oops , MySql , SDLC
Interview Preparation Tips
- Core Java
- Angular
- Spring Boot
I applied via LinkedIn
(1 Question)
- Q1. What is CSP? what is nonce? Few coding problems make flat array, etc. Advance javascript questions.
(2 Questions)
- Q1. What is generator functions? what is symbols? write an implementation for const keyword to support in es05.
- Ans.
Generator functions and symbols in JavaScript. Implementation of const keyword in ES5.
Generator functions are functions that can be paused and resumed, allowing for lazy evaluation of data.
Symbols are a new primitive type in ES6 that can be used as unique identifiers.
To implement const in ES5, we can use Object.defineProperty to create a read-only property on an object.
- Q2. Explain or write custom events with example.
- Ans.
Custom events are user-defined events that can be triggered in a software application.
Custom events can be defined using event listeners and dispatchers.
They can be used to track user behavior, monitor application performance, and trigger specific actions.
Examples of custom events include button clicks, form submissions, and page scrolls.
Interview Preparation Tips
Skills evaluated in this interview
(1 Question)
- Q1. Difference between null and object.
- Ans.
Null is absence of value while object is a collection of properties and methods.
Null is a primitive value while object is a complex data type.
Null is used to indicate absence of value while object is used to represent real-world entities.
Null cannot have properties or methods while object can have both.
Example of null: let x = null; Example of object: let person = { name: 'John', age: 30 };
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CleverTap Back End Engineer Interview Process
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