PayPal Senior Software Engineer Interview Questions and Answers for Freshers

Q1. Current company architecture and what was your role
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Q1. Detailed flow from FE to BE to db.
Ans. 
The flow of data from the front end to the back end to the database.
• Front end sends a request to the back end server.

• Back end processes the request and interacts with the database.

• Database retrieves or updates the data and sends it back to the back end.

• Back end sends the response to the front end for display.
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Q1. How to pass input field values from form to db. How to make code testable/loosely coupled.
Ans. 
Pass input field values from form to db by using a data access layer and dependency injection for testability.
• Create a data access layer to handle interactions with the database.

• Use parameterized queries to prevent SQL injection.

• Implement dependency injection to decouple the code and make it testable.

• Mock the data access layer in unit tests to isolate database interactions.

• Use interfaces to define contracts between com
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Q1. Salary discussion
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Q1. They asked about previous projects in depth
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Q1. They asked techinal all java
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Q1. Techincal kafka all questions
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Interview was conducted by third party for screening
Basic GoLang question
Basic question on Kubern8s cluster
Question on aggregating different Strings based on requirement.

Online assessment and coding test

Q1. System Design related question to understand e2e picture of a working system in prod.
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Q2. DS-Algo based question not remember now, but easy one
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Q1. Prior project based System Design and questions around it
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Q2. Design a custom data structure based on requirement
Ans. 
Custom data structure for array of strings
• Use a trie data structure to efficiently store and search for strings

• Implement methods for adding, removing, and searching for strings in the trie

• Consider optimizing the trie for memory usage and performance
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Q3. Internal working - of DB structures and indices etc
Ans. 
Understanding internal workings of DB structures and indices is crucial for optimizing database performance.
• DB structures refer to how data is organized within a database, such as tables, columns, and relationships.

• Indices are data structures that improve the speed of data retrieval operations by providing quick access to specific data values.

• Understanding how indices work can help in optimizing query performance by re...read more
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Q1. Past Experience based questions
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Q2. Behavioral/Attitude observational Questions
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DSA round on graph . String questions were asked