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PubMatic Principal Engineer Interview Questions and Answers

Updated 12 Mar 2024

PubMatic Principal Engineer Interview Experiences

1 interview found

Interview experience
3
Average
Difficulty level
Hard
Process Duration
Less than 2 weeks
Result
Not Selected

I applied via LinkedIn and was interviewed in Feb 2024. There were 2 interview rounds.

Round 1 - Technical 

(2 Questions)

  • Q1. Mostly towards your programming and coding ability. 1. Starting from DS, trees, algorithm, multi threading 2. Ask around strings and arrays
  • Q2. 1. longest path from node to node in tree
  • Ans. 

    The longest path from one node to another in a tree is the maximum number of edges that must be traversed to reach from one node to another.

    • The longest path in a tree is also known as the diameter of the tree.

    • The diameter of a tree can be found by first finding the farthest leaf node from any arbitrary node, and then finding the farthest leaf node from that leaf node.

    • The sum of the distances from the root to the farthe...

  • Answered by AI
Round 2 - Technical 

(2 Questions)

  • Q1. OS, In death problem solving questions, multi threading.
  • Q2. 1. Process 2. Dynamic memory 3. segment corrupted recovery 4. design system to take billions of request

Skills evaluated in this interview

Interview questions from similar companies

Interview Questionnaire 

1 Question

  • Q1. What type of products are there ?
Interview experience
5
Excellent
Difficulty level
-
Process Duration
-
Result
-
Round 1 - Coding Test 

Leetcode easy-medium

Round 2 - Technical 

(2 Questions)

  • Q1. What is Cyber Security and information security?
  • Ans. 

    Cyber security is the practice of protecting systems, networks, and data from digital attacks.

    • Cyber security involves implementing measures to prevent unauthorized access, data breaches, and other cyber threats.

    • It includes technologies, processes, and practices designed to protect networks, devices, programs, and data from attack, damage, or unauthorized access.

    • Examples of cyber security measures include firewalls, ant...

  • Answered by AI
  • Q2. What are the types of encryption?
  • Ans. 

    Types of encryption include symmetric encryption, asymmetric encryption, and hashing.

    • Symmetric encryption: Uses the same key for both encryption and decryption, examples include AES and DES.

    • Asymmetric encryption: Uses a pair of public and private keys for encryption and decryption, examples include RSA and ECC.

    • Hashing: Converts data into a fixed-size string of bytes, examples include MD5 and SHA.

  • Answered by AI

Skills evaluated in this interview

Interview experience
4
Good
Difficulty level
Moderate
Process Duration
-
Result
-

I applied via Campus Placement

Round 1 - Technical 

(2 Questions)

  • Q1. Basic Question on Tree Traversals
  • Q2. Questions of Linked List
Interview experience
4
Good
Difficulty level
-
Process Duration
-
Result
-
Round 1 - Coding Test 

Test was quiet easy and got selected after making 1 question wrong

Round 2 - One-on-one 

(1 Question)

  • Q1. Had this round with the manager and he asked me some logical questions and as I was a fresher no previous experience questions were asked.

Interview Preparation Tips

Interview preparation tips for other job seekers - Brush up OOPS concepts
Interview experience
4
Good
Difficulty level
Moderate
Process Duration
2-4 weeks
Result
Selected Selected

I applied via Naukri.com and was interviewed before Apr 2023. There were 2 interview rounds.

Round 1 - Technical 

(4 Questions)

  • Q1. What is manual testing
  • Ans. 

    Manual testing is the process of manually testing software for defects, errors, and bugs.

    • Manual testing involves testers executing test cases without the use of automation tools.

    • Testers follow predefined test cases to ensure the software functions correctly.

    • Manual testing is time-consuming but allows for human intuition and creativity in finding bugs.

    • Examples of manual testing include exploratory testing, ad-hoc testin

  • Answered by AI
  • Q2. What is black box and white box testing
  • Ans. 

    Black box testing focuses on testing the functionality of a software without knowing its internal code, while white box testing involves testing the internal code structure.

    • Black box testing is based on external expectations and specifications

    • White box testing is based on internal code structure and logic

    • Black box testing is also known as functional testing

    • White box testing is also known as structural testing

    • Example: I...

  • Answered by AI
  • Q3. Explain severity and priority
  • Ans. 

    Severity and priority are used to classify the importance and urgency of issues in software development.

    • Severity refers to the impact of an issue on the system or business.

    • Priority refers to the urgency of fixing an issue.

    • Severity is usually categorized as low, medium, or high.

    • Priority is usually categorized as low, medium, or high.

    • For example, a critical bug that causes the system to crash would have high severity and

  • Answered by AI
  • Q4. Explain your project
Round 2 - Technical 

(6 Questions)

  • Q1. Explain your last project
  • Q2. Write test cases
  • Ans. 

    Writing test cases for software engineer position

    • Test case for login functionality: verify valid credentials login successfully, verify invalid credentials show error message

    • Test case for search functionality: verify search results display correctly, verify no results message shown for invalid search

    • Test case for checkout process: verify items added to cart correctly, verify payment process completes successfully

  • Answered by AI
  • Q3. What is QA and QC
  • Ans. 

    QA stands for Quality Assurance and involves the process of ensuring quality in software development. QC stands for Quality Control and involves the process of verifying quality in the final product.

    • QA focuses on preventing defects in the software development process

    • QC focuses on identifying defects in the final product

    • QA involves processes like code reviews, unit testing, and continuous integration

    • QC involves processe...

  • Answered by AI
  • Q4. What is defect cascading
  • Ans. 

    Defect cascading is when a defect in one part of the software causes defects in other parts.

    • Occurs when a defect in one module goes undetected and affects other modules

    • Can lead to a chain reaction of defects throughout the software

    • Often results from poor testing practices or lack of communication among team members

  • Answered by AI
  • Q5. What is defect seeding
  • Ans. 

    Defect seeding is the intentional introduction of defects into a software system to evaluate the effectiveness of testing processes.

    • Defect seeding helps in identifying weaknesses in the testing process

    • Common techniques include adding bugs to the codebase or injecting faults into the system

    • It is used to measure the thoroughness and efficiency of testing

  • Answered by AI
  • Q6. What is defect life cycle
  • Ans. 

    Defect life cycle is the process of identifying, reporting, fixing, retesting, and closing software bugs.

    • Defect identification: Bugs are found during testing or by users.

    • Defect reporting: Bugs are documented in a bug tracking system.

    • Defect fixing: Developers address and resolve the reported bugs.

    • Defect retesting: Testers verify that the bug is fixed.

    • Defect closing: Once verified, the bug is marked as closed.

  • Answered by AI

Skills evaluated in this interview

Interview experience
5
Excellent
Difficulty level
-
Process Duration
-
Result
-

I applied via Campus Placement

Round 1 - Aptitude Test 

Networking,Operating system,Dsa,DBMS

Interview experience
5
Excellent
Difficulty level
Hard
Process Duration
Less than 2 weeks
Result
Selected Selected

I applied via Referral and was interviewed in Nov 2023. There were 4 interview rounds.

Round 1 - Resume Shortlist 
Pro Tip by AmbitionBox:
Don’t add your photo or details such as gender, age, and address in your resume. These details do not add any value.
View all Resume tips
Round 2 - Technical 

(1 Question)

  • Q1. Coding Round, Design Pattern
Round 3 - Technical 

(1 Question)

  • Q1. Coding, Design Pattern
Round 4 - Technical 

(1 Question)

  • Q1. Coding, SOLID, System Design
Interview experience
5
Excellent
Difficulty level
-
Process Duration
-
Result
-
Round 1 - Coding Test 

Easy interview and designs pattern

Round 2 - Technical 

(1 Question)

  • Q1. Find kth elements in string
  • Ans. 

    Use a sorting algorithm to find the kth element in a string array.

    • Sort the array of strings using a sorting algorithm like quicksort or mergesort.

    • Return the kth element from the sorted array.

  • Answered by AI

I applied via LinkedIn

Interview Questionnaire 

1 Question

  • Q1. I have been questioned on different concepts in AEM, sling models, services, servlets, schedulers, workflow

Interview Preparation Tips

Interview preparation tips for other job seekers - The overall interview process was smooth and as per schedule.
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PubMatic Interview FAQs

How many rounds are there in PubMatic Principal Engineer interview?
PubMatic interview process usually has 2 rounds. The most common rounds in the PubMatic interview process are Technical.
What are the top questions asked in PubMatic Principal Engineer interview?

Some of the top questions asked at the PubMatic Principal Engineer interview -

  1. 1. longest path from node to node in t...read more
  2. 1. Process 2. Dynamic memory 3. segment corrupted recovery 4. design system to ...read more
  3. Mostly towards your programming and coding ability. 1. Starting from DS, trees,...read more

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PubMatic Principal Engineer Interview Process

based on 1 interview

Interview experience

3
  
Average
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₹32 L/yr - ₹55 L/yr
57% more than the average Principal Engineer Salary in India
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