'Coding has over 700 languages', '67% of programming jobs aren’t in the technology industry', 'Coding is behind almost everything that is powered by electricity'
American Express interview experience Real time questions & tips from candidates to crack your interview
SDE - Intern
American Express
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4 rounds | 8 Coding problems
Interview preparation journey
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Preparation
Duration: 2.5 months
Topics: C++, Data Structures, Algorithms, Operating Systems, Object Oriented Programming, Database Management System, Computer Networks
Tip
Tip

Tip 1 : Have confidence in Data Structures and Algorithms. Have your concepts very clear and then pick one coding platform( leetcode, InterviewBit, CodeZen, GeeksForGeeks) and try to practice around 7-10 questions everyday with varying difficulty and different topics.Also solving questions is not enough, try to optimize it. Analyze its space and time complexities.
Tip 2 : Study properly about OOPS concepts. Coding Ninja's Data Structures and Algorithms course is great for preparing the OOPS concepts specifically. For OS and DBMS refer to your college notes and GeekForGeeks articles.
Tip 3 : Keep participating in coding contests. It helps you increase your problem solving skills.

Application process
Where: Campus
Eligibility: Above 7 CGPA
Resume Tip
Resume tip

Tip 1 : Add those skills, projects and achievements which are relevant to your role.
Tip 2 : Do not fake any skills, projects or achievements. 
Tip 3 : You do need to have a several number of projects. 1 good project with good knowledge of it will also do fine. The similar rule goes for skills also.
Tip 4 : Try to write achievements which proves your technical skills, leadership quality, communication skills or teamwork.

Interview rounds
01
Round
Easy
Online Coding Test
Duration120 minutes
Interview date28 Aug 2020
Coding problem2

The coding round was at 11 am in the morning. The questions were of medium level. The questions were purely based on Data Structures and Algorithms.

1. Sliding Maximum
Moderate
25m average time
85% success
0/80
Asked in companies
American ExpressFlipkartAmazon

You are given an array 'ARR' of integers of length 'N' and a positive integer 'K'. You need to find the maximum elements for each and every contiguous subarray of size K of the array.

<...
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2. Longest Sub-string with at most K Distinct Characters
Moderate
35m average time
65% success
0/80
Asked in companies
IntuitInfosysMorgan Stanley

You are given string S of length N, and an integer K. Your task is to find the length of the longest substring that contains at most K distinct characters.

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02
Round
Easy
Face to Face
Duration45 minutes
Interview date31 Aug 2020
Coding problem1

I was selected for the interview. The interview was conducted early in the morning at 10 am. The interviewer was very friendly and calm.

1. Technical Questions

1. Tell in detail about your one project. 
2. Questions related to the project were followed, such as what challenges I faced during the course of making the project.
3. What is copy constructor and where it can be used?
4. What is the difference between a reference and a pointer?
5. What are your interests?

6. Is there any technology that interests you and you would like...

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03
Round
Easy
Telephonic
Duration30 minutes
Interview date1 Sep 2020
Coding problem2

This round was a mix of technical, puzzles and HR. The interview was fairly easy, The interviewer asked for my introduction and continued with the interview then.

1. Stack using queue
Moderate
25m average time
65% success
0/80
Asked in companies
Paytm (One97 Communications Limited)JP MorganIndiaMart

Implement a Stack Data Structure specifically to store integer data using two Queues.


There should be two data members, both being Queues to store the data internally. ...

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2. Puzzle

There is a room with a door (closed) and three light bulbs. Outside the room, there are three switches, connected to the bulbs. You may manipulate the switches as you wish, but once you open the door you can’t change them. Identify each switch with its bulb. All bulbs are in working condition.

04
Round
Easy
Telephonic
Duration45 minutes
Interview date1 Sep 2020
Coding problem3

This was the last round for getting selected as an intern. However, this was a pure technical round. Only coding questions were asked. Also, at the end he asked me the question, Why American express?

1. Detect and Remove Loop
Moderate
10m average time
90% success
0/80
Asked in companies
SAP LabsAmerican ExpressExpedia Group

Given a singly linked list, you have to detect the loop and remove the loop from the linked list, if present. You have to make changes in the given linked list itself and return the updated li...

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Problem approach

1. Traverse linked list using two pointers, that is, slow and fast pointer
2. Move slow pointer by one and fast pointerby two.
3. If these pointers meet at the same node then there is a loop. If pointers do not meet then linked list doesn’t have a loop.

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2. DBMS Questions

Explain Natural Join, Cross Join, Right Outer and Left Outer Join with diagrams. Also write queries using GROUP BY and HAVING.

3. Interval List Intersection
Easy
15m average time
85% success
0/40
Asked in companies
American ExpressFacebookIntuit

You have been given two sorted arrays/lists of closed intervals ‘INTERVAL1’ and ‘INTERVAL2’. A closed interval [x, y] with x < y denotes the set of real numbers ‘z’ with x <= z <= y.

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