Google Pay Software Developer Interview Questions and Answers

The topic was -> "One nation one election"

Q1. What is a String pool in Java?
Ans. 
String pool in Java is a pool of unique strings stored in memory to optimize memory usage.
• String pool is a part of Java's memory where unique string literals are stored.

• When a new string is created, Java checks if it already exists in the pool to save memory.

• Strings created using double quotes are added to the pool, while those created using 'new' keyword are not.

• Example: String str1 = "hello"; String str2 = "hello"; /...read more
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Q2. Explain different types of exception in Java.
Ans. 
Java has checked and unchecked exceptions. Checked exceptions must be handled at compile time, while unchecked exceptions do not need to be handled explicitly.
• Checked exceptions: Must be caught or declared in the method signature. Example: IOException, SQLException

• Unchecked exceptions: Do not need to be caught or declared. Example: NullPointerException, ArrayIndexOutOfBoundsException
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1 dp
2 dynamic graph

Q1. Data structure and algorithms
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Q2. Data structure and algorithm
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Q1. Sort the list, after many queries
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Q2. LRU cache with multi level caching
Ans. 
LRU cache with multi level caching involves implementing a cache with multiple levels of storage, where the least recently used items are evicted first.
• Implement a two-level cache system with a primary cache (e.g. in-memory) and a secondary cache (e.g. disk-based).

• Use a data structure like a doubly linked list and a hash map to efficiently manage the cache and track the least recently used items.

• When an item is accesse...read more
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Q1. Basic oops, .net, c# coding, sql questions
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Q1. More coding and details on project
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Q1. More on projects and system design and troubleshooting approach
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Q1. Salary discussion
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Q1. More technical + managerial round even after HR round
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One medium and one standard DP question

Q1. Medium level question based on binary search
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Q1. Design google-pay
Ans. 
Design Google Pay - a digital wallet platform for online payments and transactions.
• Allow users to securely store payment information such as credit/debit cards, bank accounts, and loyalty cards.

• Enable users to make payments in stores, online, and within apps using their stored payment methods.

• Implement security features like biometric authentication, tokenization, and encryption to protect user data.

• Provide features fo...read more
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Q2. HLD of recursive
Ans. 
High Level Design (HLD) of recursive functions in software development.
• Recursive functions call themselves to solve smaller instances of the same problem.

• HLD of recursive functions involves defining the base case, recursive case, and termination condition.

• Example: HLD of a recursive function to calculate factorial of a number involves defining base case as factorial(0) = 1.
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Q1. Puzzles available on GFG
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Q2. Behavioral question
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Q1. LLD HLD HM rounds
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Q1. Array basics, java basics oops and all
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Q1. Tell me about yourself and about previous organisation.
Ans. 
I am a software developer with 5 years of experience. I previously worked at XYZ Company as a full-stack developer.
• 5 years of experience in software development

• Previous role as a full-stack developer at XYZ Company

• Proficient in programming languages such as Java, Python, and JavaScript
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Q2. Basic technical questions about the framework and the specific language.
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Q1. More technical questions
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SQL and coding questions

Q1. Salary negotiation
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