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American Express Backend Developer Interview Questions and Answers
American Express Backend Developer Interview Experiences
2 interviews found
Anonymous
(1 Question)
- Q1. Coin change problem
- Ans.
The coin change problem involves finding the number of ways to make a specific amount using given coin denominations.
Define the problem: Given coins of certain denominations, find ways to make a target amount.
Dynamic programming approach: Use an array to store the number of ways to make each amount up to the target.
Example: For coins [1, 2, 5] and target 5, ways are: (5), (2+2+1), (2+1+1+1), (1+1+1+1+1).
Base case: Ther...
Skills evaluated in this interview
I applied via Naukri.com and was interviewed in Apr 2024. There were 2 interview rounds.
(1 Question)
- Q1. System design of iot machine
- Ans.
Designing a system for IoT machines involves creating a network that allows devices to communicate and share data.
Consider the communication protocols needed for devices to connect and exchange data
Implement security measures to protect data and prevent unauthorized access
Design a scalable architecture to handle a large number of devices and data
Utilize cloud services for storage and processing of IoT data
Include edge ...
Linked list implementation
Interview Preparation Tips
Skills evaluated in this interview
Top trending discussions
Interview questions from similar companies
I applied via Instahyre and was interviewed in Feb 2022. There were 2 interview rounds.
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
(5 Questions)
- 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
- 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()
- 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
- 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
- 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]
Interview Preparation Tips
- Node.Js
Skills evaluated in this interview
I applied via Walk-in and was interviewed before Jul 2021. There was 1 interview round.
(1 Question)
- Q1. What are the types of derivatives?
- Ans.
Derivatives are financial instruments that derive their value from an underlying asset or security.
Types of derivatives include futures, options, swaps, and forwards.
Futures are contracts to buy or sell an asset at a predetermined price and date.
Options give the buyer the right, but not the obligation, to buy or sell an asset at a predetermined price and date.
Swaps involve exchanging cash flows based on different finan...
Interview Preparation Tips
I appeared for an interview before Sep 2020.
(1 Question)
Round duration - 90 minutes
Round difficulty - Medium
It was a cumulative test
- Q1.
Trapping Rainwater Problem Statement
You are given an array
ARRof long type, which represents an elevation map whereARR[i]denotes the elevation of theithbar. Calculate the total amount of rainwater t... - Ans.
Calculate the total amount of rainwater that can be trapped within given elevation map.
Iterate through the array to find the maximum height on the left and right of each bar.
Calculate the amount of water that can be trapped above each bar by taking the minimum of the maximum heights on the left and right.
Sum up the trapped water above each bar to get the total trapped water for the elevation map.
(1 Question)
Round duration - 90 minutes
Round difficulty - Medium
It was sophisticated in nature and a good brain buster.
- Q1.
Candies Distribution Problem Statement
Prateek is a kindergarten teacher with a mission to distribute candies to students based on their performance. Each student must get at least one candy, and if two s...
- Ans.
Determine the minimum number of candies needed to distribute to students based on their performance and ratings.
Iterate through the array of student ratings and assign 1 candy to each student initially.
Then iterate from left to right and check if the current student's rating is higher than the previous student, if so, assign candies accordingly.
Similarly, iterate from right to left to handle cases where the current stu...
(1 Question)
Round duration - 1 hour
Round difficulty - Medium
- Q1. DBMS
It revolved around basic concepts
- Ans.
DBMS is a software system that manages databases and allows users to interact with data stored in them.
DBMS stands for Database Management System
It helps in creating, updating, and managing databases
Examples of DBMS include MySQL, Oracle, SQL Server
It ensures data integrity, security, and efficient retrieval
Round duration - 70 minutes
Round difficulty - Hard
It was a great experience
Interview Preparation Tips
Tip 1 : Stay consistent with your efforts
Tip 2 : Work hard with honesty
Tip 3 : Try to set goal of +1 level from the goal you want to achieve
Tip 1 : Present yourself with honesty
Tip 2 : Mention about the Workshops, hackathons, achievements, and the projects.
Skills evaluated in this interview
I applied via Campus Placement and was interviewed before Nov 2021. There were 3 interview rounds.
Moderate level aptitude with basics
Moderate level data structure questions
Interview Preparation Tips
Interview Questionnaire
1 Question
- Q1. It was mostly about the instrument reference data and typical business analyst question about change management, BRD, Agile and technology we use.
I applied via Campus Placement and was interviewed before Sep 2020. There were 5 interview rounds.
Interview Questionnaire
1 Question
- Q1. Few DSA questions, questions about my projects and my resume. Also, since I specialise in python, if I could create an API using it. HR questions, hobbies, leadership experience...
Interview Preparation Tips
I applied via Recruitment Consultant and was interviewed before Jun 2020. There were 3 interview rounds.
Interview Questionnaire
1 Question
- Q1. Project Overview BA/PO related questions Domain and Behavioral questions
Interview Preparation Tips
Be confident of the behaviour questions as per the past and practical experience
I applied via Walk-in and was interviewed before Jun 2020. There were 5 interview rounds.
Interview Questionnaire
2 Questions
- Q1. Basic accounts and finance questions
- Q2. If you dont know answer better be straight forward about it
Interview Preparation Tips
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Overall Interview Experience Rating
based on 2 interview experiences
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