American Express Backend Officer Interview Questions and Answers

Hacker Renk test with coding problems, need to pass it

Q1. Oops concepts in detail
Ans. 
Object-oriented programming concepts that help in creating modular and reusable code.
• Abstraction - hiding implementation details

• Encapsulation - binding data and functions together

• Inheritance - creating new classes from existing ones

• Polymorphism - using a single interface to represent multiple types

• Composition - combining objects to create more complex ones
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Q2. Oops concepts in technology, design patterns
Ans. 
Object-oriented programming concepts and reusable solutions for common problems.
• Encapsulation, inheritance, and polymorphism are key OOP concepts.

• Design patterns provide reusable solutions for common programming problems.

• Examples of design patterns include Singleton, Factory, and Observer.

• Understanding OOP and design patterns can lead to more efficient and maintainable code.
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Q1. Manager round managerial qualities
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Q2. Work management related questions
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Q1. General plus salary discussions
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A hackerrank test was shared which had 2 ques to be solved in 60 min in Node.JS. The first one was a simple DS question related to arrays. The second ques was to write routes and controllers for a Node.JS Express app. The routes were GET /projects, GET /project/:id and GET /projects/active

Q1. What is the difference between package and package-lock.json?
Ans. 
package.json lists dependencies and package-lock.json ensures consistent installs.
• package.json lists all the dependencies required for the project

• package-lock.json ensures that the same versions of dependencies are installed across all environments

• package.json is manually edited while package-lock.json is generated automatically

• package-lock.json is used for reproducible builds
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Q2. Write a function that can keep a count of certain functions in our application.
Ans. 
Function to count certain functions in the application
• Create a dictionary to store the count of each function

• Increment the count of the function each time it is called

• Include a reset function to reset the count of all functions

• Example: def count_functions(): function_count = {}

• Example: def function1(): function_count['function1'] += 1

• Example: def reset_count(): function_count.clear()
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Q3. How can we make sure that package versions are taken from package-lock.json and not package.json
Ans. 
To ensure package versions are taken from package-lock.json, use npm ci instead of npm install.
• npm ci installs packages based on package-lock.json

• npm install may update package versions in package.json

• Always commit package-lock.json to version control
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Q4. Create an object and write a function inside it.
Ans. 
Creating an object with a function inside it.
• Create an object using object literal notation

• Define a function inside the object using function expression or declaration

• Access the function using object.method() syntax
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Q5. Given an array that has stock prices from morning till afternoon. Return the best buy and sell price to gain the max profit. For example, input -> [2,5,8,1,3,6,9,3,6], output -> [1,9]
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90 mins 10 -15 questions on database sql queries

Q1. Related the data-warehouse & ETL related questions
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Q1. Sql queries & scenarios based questions
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Q1. Client facing questions and real - time questions related to problem like speed , etl optimisation & optimised sql queries , SCD types , techniques to load the huge data in quicker way
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Q1. It was 1 hour 30 mins round which was personality check and the questions was related to how you handle things in professional way .
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Q1. What are your strengths and weaknesses?
Ans. 
My strengths include strong problem-solving skills and attention to detail. My weaknesses include a tendency to overthink and a lack of experience in certain technologies.
• Strength: Strong problem-solving skills

• Strength: Attention to detail

• Weakness: Tendency to overthink

• Weakness: Lack of experience in certain technologies
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Q2. What are your salary expectations?
Ans. 
I would expect a competitive salary based on my experience, skills, and the responsibilities of the role.
• Consider the market rate for Lead Backend Developers in the industry.

• Take into account your years of experience and expertise in backend development.

• Factor in the responsibilities and scope of the role.

• Research salary ranges for similar positions in the company or industry.

• Be prepared to negotiate and discuss benefi
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Q3. Why are you looking for a change?
Ans. 
Looking for new challenges and growth opportunities in a dynamic and innovative company.
• Seeking a more challenging role to further develop my skills and expertise.

• Interested in working with cutting-edge technologies and staying up-to-date with industry trends.

• Desire to work in a collaborative and supportive team environment.

• Want to contribute to the success of a company that aligns with my values and goals.

• Seeking bett...read more
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10 multiple choice questions
2 program writing questions.

Q1. This an one to one round. Questions are based on oops concepts, design patterns and also writting code.
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Q1. This is kind of managerial round.
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