PubMatic Interview Experience For SDE (On-Campus)

Round 1:

In total, there are 17 questions.

15 MCQs + 2 coding questions

There were 211 students in round 1, and 20 were selected for the next rounds, including me.

Before the technical interview, they asked us to give our top 3 preferred languages for the next round. The choice of language is between Scala, Java, JavaScript, and C programming.

Round 2: (First Technical Interview)

The interviewer is quite friendly.

• The interviewer asked me to introduce myself.
• Then asked me to explain my project (I explained my final-year group project).
• After that, questions related to the project, like what my role was in the project and how it was different from the existing applications.
• Then asked me to explain the four pillars of the OOPS.
• Difference between abstract class and interface.
• Questions about hashmap.
• Then the interview moves on to the main part i.e DSA,

1. Given an array and a target number, find the first subarray that has a sum equal to the target.
2. Given a linked list and target, delete the last node in the linked list having a value equal to the target.

• Question-based on joins
• SQL query to find the second-highest salary in the table.

The interview went for 1 hour, including me few students selected for the second technical.

Round 3 : (Second Technical Interview)

• Introduce yourself.
• Explain the project and questions related to it same as the first round.
• Explain Encapsulation and abstraction with real-life examples.
• Why string is immutable?
• Internal working of hashmap.
• Data Structure and algorithm question

1. Decode the string

• Input Output
• [a2[b]] : abb
• 2[b3[a]]] : baaabaaa
• 3[a2[b]] : abcbcabcbcabcbc

• Explain the program, process and thread.
• What is deadlock? Deadlock avoidance conditions.
• What is a semaphore?
• SQL query to find the number of distinct employees.

The interview went for 1 hr 20 min.

Only three students were selected for the HR round.