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IBM Research Research and Development Interview Questions and Answers

Updated 17 Oct 2016

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I applied via Naukri.com and was interviewed in Dec 2020. There were 3 interview rounds.

Interview Questionnaire 

1 Question

  • Q1. Basics of DS and algorithms

Interview Preparation Tips

Interview preparation tips for other job seekers - be thorough in data structures and algorithms

Interview Questionnaire 

1 Question

  • Q1. Basic javascript questions , clouser, promise

Interview Preparation Tips

Interview preparation tips for other job seekers - Prepared well on basic of javascript

I applied via Campus Placement and was interviewed in Dec 2020. There was 1 interview round.

Interview Questionnaire 

2 Questions

  • Q1. 1. If you given a no return its corresponding excel no.
  • Ans. 

    Convert given no to corresponding excel no.

    • Excel no starts from 1 and goes up to 16384

    • Excel no is calculated using column and row numbers

    • For example, 1 corresponds to A, 27 corresponds to AA, 28 corresponds to AB, and so on

  • Answered by AI
  • Q2. 2. find unique character in a window of k size in a string
  • Ans. 

    Find unique characters in a window of k size in a string.

    • Use a sliding window approach.

    • Maintain a hash table to keep track of character frequency.

    • Remove characters from hash table as the window slides.

  • Answered by AI

Interview Preparation Tips

Interview preparation tips for other job seekers - Communication is very important. Give your solution from brute force to optimal. Interviewer has tell me to write code of both questions in any programming language.

Skills evaluated in this interview

I applied via Campus Placement and was interviewed in May 2021. There was 1 interview round.

Interview Questionnaire 

1 Question

  • Q1. OOPs concept

Interview Preparation Tips

Interview preparation tips for other job seekers - Just be yourself.

I applied via Campus Placement and was interviewed in May 2021. There was 1 interview round.

Interview Questionnaire 

1 Question

  • Q1. Dsa java oops dbms networking

Interview Preparation Tips

Interview preparation tips for other job seekers - Good interview experience.
You have to be very strong in DSA.

I applied via Naukri.com and was interviewed in Jan 2021. There were 3 interview rounds.

Interview Questionnaire 

2 Questions

  • Q1. More questions on which topic
  • Q2. Focus on c#, MVC and SQL

Interview Preparation Tips

Interview preparation tips for other job seekers - Prepare well technically and scenario based questions also prepared.

I applied via Recruitment Consultant and was interviewed in Oct 2020. There were 6 interview rounds.

Interview Questionnaire 

1 Question

  • Q1. Oops concepts with examples, SQL query to find second highest salary, diff between fail fast and fail safe, how did u implement security in your app, etc

Interview Preparation Tips

Interview preparation tips for other job seekers - Prepare basic Java concepts

I applied via Campus Placement and was interviewed before Jul 2021. There were 2 interview rounds.

Round 1 - Aptitude Test 

Standard Aptitude topics, 30 mins - 30 questions

Round 2 - One-on-one 

(2 Questions)

  • Q1. Case Study for how to design a data Lake ? standard questions - tell me about yourself, why us
  • Q2. Case Study for how to design a chess game

Interview Preparation Tips

Topics to prepare for Quantiphi Analytics Solutions Private Limited Intern interview:
  • SQL
  • Java
Interview preparation tips for other job seekers - Easy, They want to check for approach and ability of the candidate

I applied via Naukri.com and was interviewed before Mar 2020. There were 4 interview rounds.

Interview Questionnaire 

4 Questions

  • Q1. Difference between Hashtable and hashmap?
  • Ans. 

    Hashtable is synchronized while hashmap is not.

    • Hashtable is thread-safe while hashmap is not.

    • Hashtable does not allow null keys or values while hashmap allows one null key and multiple null values.

    • Hashtable is slower than hashmap due to synchronization.

    • Hashtable is a legacy class while hashmap is a newer implementation.

  • Answered by AI
  • Q2. Difference between hashmap and concurrent hashmap?
  • Ans. 

    Hashmap is not thread-safe while Concurrent Hashmap is thread-safe.

    • Hashmap is not suitable for multi-threaded environments as it can lead to race conditions and data inconsistencies.

    • Concurrent Hashmap allows multiple threads to access and modify the map concurrently without any data inconsistencies.

    • Concurrent Hashmap uses a technique called lock striping to achieve thread-safety.

    • Concurrent Hashmap is slower than Hashma...

  • Answered by AI
  • Q3. Jdbc step
  • Q4. Spring ioc

Interview Preparation Tips

Interview preparation tips for other job seekers - Interview was average they asked questions from core java spring hibernate... And so on..

Skills evaluated in this interview

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IBM Research Research and Development Interview Process

based on 1 interview

Interview experience

4
  
Good
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