PubMatic Interview Questions, Process, and Tips

1. Program on LRU algorithm for pages
2. Multithreading- 3 threads to run one after - use of binary_semaphore
3. Mutex vs Semaphore

Basic linear DS questions

Q1. Sourcing for Java folks
Ans. 
Utilize various sourcing methods to find qualified Java candidates
• Utilize job boards like Indeed and LinkedIn to search for Java developers

• Attend Java meetups and conferences to network with potential candidates

• Utilize social media platforms like Twitter and GitHub to find Java developers

• Partner with coding bootcamps and universities to find recent Java graduates
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Q1. Behavioral round focusing on personality
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Consisted of 1 easy, 2 medium level problems

Q1. Implementation of Heap data structure An easy LC question
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Q1. Discussion on some design question
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The coding round was for 1 hour. The problems asked were fairly easy to comprehend the logic.

This round was for an hour. In this round the test automation questions were asked, like finding the XPath and automating a simple feature such as search on make my trip or the calendar date select on mmt.

Q1. Optimize an existing system. The system currently makes an API call and stores data in its memory. When it tries to serve a request from another component it refers to the memory location by searching the ...read more
Ans. 
Implement a data structure like a hash table or a cache to optimize memory search.
• Use a hash table to store the data with keys as memory locations

• Implement a cache to store frequently accessed data for faster retrieval

• Consider using indexing or sorting techniques to optimize search operations
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Q1. What is your current salary?
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Q2. Questions about cultural fit.
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Q3. What is your expectation?
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First round has few technical MCQ and 1 sql query question and 2 coding questions 1 is easy and 2 is medium

Q1. What if person mistakenly put F for male and M for female in sql how do you solve this
Ans. 
To solve the issue of mistakenly assigned gender values in SQL, you can update the incorrect values using SQL queries.
• Identify the incorrect gender values in the SQL table

• Use UPDATE statement with appropriate conditions to correct the values

• For example, if 'F' is mistakenly assigned for male, update it to 'M' using UPDATE statement
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Q2. Asked few linux command and mysql queries
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Q3. Basic oop and java questions
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Q1. Count the occurances a purticualar word from a file.
Ans. 
Count the occurrences of a particular word from a file.
• Read the file and store its contents in a string variable.

• Split the string into an array of words using a delimiter.

• Loop through the array and count the occurrences of the particular word.

• Return the count.
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Q2. Asked about personal projects
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