American Express Full Stack Software Developer Interview Questions and Answers

Q1. Describe previous projects Challenges you faced previously Some technical questions based on the experience
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Nice interview with the friendly interviewer

Q1. Tell me about your self
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Q1. Design a system where images and documents would be transferred to client.
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Q2. Redis caching details
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Q3. How to call rest api in Angular
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GAVE AN ARRAY AND ASKED TO MOVE ZEROES TO THE END AND GROUPBY IN STREAMS JOINS IN SQL

Q1. Java OOPS concepts abstract class vs interface
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Q2. SQL query to find duplicate values
Ans. 
Use GROUP BY and HAVING clause to find duplicate values in SQL.
• Use GROUP BY clause to group the data based on the column you want to check for duplicates.

• Use HAVING clause to filter out groups that have more than one entry, indicating duplicates.

• Example: SELECT column_name, COUNT(*) FROM table_name GROUP BY column_name HAVING COUNT(*) > 1;
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Karet coding evaluation platform is used

Q1. Technical + coding assessment was there
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Q2. Find max continous sub array with unique elements in an array
Ans. 
Find max continous sub array with unique elements in an array
• Use sliding window approach

• Keep track of unique elements in the window

• Update max length when a duplicate element is found
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Q1. Pure Technical round
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Q1. Typical Managerial round
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Q1. Payscale discussion round
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Q1. Why microservices?
Ans. 
Microservices offer scalability, flexibility, and easier maintenance in software development.
• Scalability: Microservices allow for individual components to be scaled independently, leading to better resource utilization.

• Flexibility: Microservices enable teams to work on different services simultaneously, promoting faster development and deployment.

• Easier maintenance: With microservices, it's easier to identify and fix i...read more
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Q2. Why you went for microservices in your application
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Q3. Mention about the design patterns you worked so far
Ans. 
I have worked with various design patterns such as Singleton, Factory, Observer, and MVC.
• Implemented Singleton pattern to ensure only one instance of a class exists

• Utilized Factory pattern to create objects without specifying the exact class

• Implemented Observer pattern to establish a one-to-many dependency between objects

• Utilized MVC pattern to separate the concerns of data, presentation, and user input
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