American Express Backend Developer Interview Questions and Answers

Q1. 1. Insertion in LL 2. Java core
Add your answer

Q1. 1. Project related question of internship 2. Python libraries
Add your answer

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
Answered by AI
Add your answer
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.
Answered by AI
Add your answer

Q1. Manager round managerial qualities
Add your answer
Q2. Work management related questions
Add your answer

Q1. General plus salary discussions
Add your answer

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
Answered by AI
Add your answer
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()
Answered by AI
Add your answer
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
Answered by AI
Add your answer
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
Answered by AI
Add your answer
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]
Add your answer

90 mins 10 -15 questions on database sql queries

Q1. Related the data-warehouse & ETL related questions
Add your answer

Q1. Sql queries & scenarios based questions
Add your answer

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
Add your answer

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 .
Add your answer

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
Answered by AI
Add your answer
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
Answered by AI
Add your answer
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
Answered by AI
Add your answer

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.
Add your answer

Q1. This is kind of managerial round.
Add your answer