PubMatic Principal Engineer Interview Questions and Answers

Leetcode easy-medium

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...read more
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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.
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Q1. Basic Question on Tree Traversals
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Q2. Questions of Linked List
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Test was quiet easy and got selected after making 1 question wrong

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.
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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
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Q2. What is black box and white box testing
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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...read more
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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
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Q4. Explain your project
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Q1. Explain your last project
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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
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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...read more
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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
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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
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Q6. What is defect life cycle
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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.
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Networking,Operating system,Dsa,DBMS

Q1. Coding Round, Design Pattern
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Q1. Coding, Design Pattern
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Q1. Coding, SOLID, System Design
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Easy interview and designs pattern

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.
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