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American Express Software Developer Intern Interview Questions, Process, and Tips

Updated 7 Dec 2021

Top American Express Software Developer Intern Interview Questions and Answers

  • Q1. Unique Frequency Problem Statement Given a string 'STR' with lowercase letters, determine the minimum number of deletions required to ensure that every letter in the str ...read more
  • Q2. Longest Switching Subarray Problem Statement Determine the length of the longest contiguous subarray in a given array of positive integers, where the subarray qualifies ...read more
  • Q3. Palindrome Linked List Detection Given a singly linked list of integers, determine if it is a palindrome. A linked list is considered a palindrome if it reads the same f ...read more
View all 12 questions

American Express Software Developer Intern Interview Experiences

4 interviews found

I was interviewed before Dec 2020.

Round 1 - Coding Test 

(3 Questions)

Round duration - 90 minutes
Round difficulty - Medium

It consist three question - first que is of related to tree and i gave difficulty level of this question as hard. second que is of based on logical and reasoning , it is medium level question and third que can be done by map and it is also medium level que.
In codility platform we are not able to see hidden test cases whether it is satisfied or not . we just have to submit after passing sample testcases.

  • Q1. 

    Minimum Number of Swaps to Sort an Array

    Find the minimum number of swaps required to sort a given array of distinct elements in ascending order.

    Input:

    T (number of test cases)
    For each test case:
    N (siz...
  • Ans. 

    The minimum number of swaps required to sort a given array of distinct elements in ascending order.

    • Use a graph-based approach to find cycles in the array

    • Count the number of swaps needed to fix each cycle

    • Sum up the swaps needed for all cycles to get the total minimum swaps

  • Answered by AI
  • Q2. 

    Maximum Non-Adjacent Subsequence Sum

    Given an array of integers, determine the maximum sum of a subsequence without choosing adjacent elements in the original array.

    Input:

    The first line consists of an...
  • Ans. 

    Find the maximum sum of a subsequence without choosing adjacent elements in an array.

    • Use dynamic programming to keep track of the maximum sum at each index, considering whether to include or exclude the current element.

    • At each index, the maximum sum is either the sum of the current element and the sum two positions back, or the sum at the previous index.

    • Iterate through the array and update the maximum sum accordingly.

    • E...

  • Answered by AI
  • Q3. 

    Left View of a Binary Tree Problem Statement

    Given a binary tree, your task is to print the left view of the tree.

    Example:

    Input:
    The input will be in level order form, with node values separated by a...
  • Ans. 

    Print the left view of a binary tree given in level order form.

    • Traverse the tree level by level and print the first node encountered at each level

    • Use a queue to perform level order traversal

    • Keep track of the current level and the maximum level seen so far

  • Answered by AI
Round 2 - Video Call 

Round duration - 30 minutes
Round difficulty - Medium

basically this round is just same as HR round . they asked me behavioural questions and about my projects , hackathon. the timing is mid noon and interviewer is supportive , it makes first comfortable then start questioning . for this round i suggest be honest , don't just express your qualities but trying to show them by your skills and work.

Interview Preparation Tips

Eligibility criteria7 cgpaAmerican Express interview preparation:Topics to prepare for the interview - Data structures and algorithms with lots of question practice topic wise, core subjects like that oops,dbms,os.Time required to prepare for the interview - 7 MonthsInterview preparation tips for other job seekers

Tip 1 : all we know focus on ds and algorithms is must but how should we prepare ? so , the answer is read concepts and then practice question topic wise or company wise in gfg.
Tip 2 : do focus on cp it is must to clear very first coding round. Also many of them do cp but in their comfort zone that means those question from which they have good hold but i say this would not give any benefit . so , solve que out of comfort zone , which takes time but is is most efficient way.
Tip 3 : Also balance between cp and projects is must.

Application resume tips for other job seekers

Tip 1 : it is crisp . for ex - you have a good knowledge on java, cpp , c , python . and lets say you have basic knowledge of html,css then don't mention these subjects. 
Tip 2 : Achievements should be in reverse chronological order like first focus on college achievements , then on school.
Tip 3 : i saw like many of them made just one resume and use for all , but i suggest each time made resume according to post you apply for and in which company. which increases your chances in shortlisted candidates.

Final outcome of the interviewSelected

Skills evaluated in this interview

I was interviewed before Sep 2020.

Round 1 - Coding Test 

(2 Questions)

Round duration - 120 minutes
Round difficulty - Easy

It consisted of 3 coding questions which were purely based on Data Structures and Algorithms.

Question 1 - Find the length of the longest switching sub-array. An array is called switching if all numbers in even positions are equal and all numbers in odd positions are equal. 


Question 2 - It was a long passage question on Dynamic Programming but the solution was really easy.

Question 3 - Given a string S consisting of N lowercase letters, return the minimum number of letters that must be deleted to obtain a word in which every letter occurs a unique number of times. Ex - "aaaabbbb" should return 1, as when we delete 1 a or 1 b , a and b will have different frequencies.


The major point to note in the coding round was that they did not have any time or space limit, so brute force solutions were also accepted. 
The result of my test was declared just as the test ended and I scored a 100%, but they took a long time to release the final shortlist. There was a gap of about a week between the test and interviews.

  • Q1. 

    Longest Switching Subarray Problem Statement

    Determine the length of the longest contiguous subarray in a given array of positive integers, where the subarray qualifies as 'switching'. An array is defined...

  • Ans. 

    Find the length of the longest switching subarray in a given array of positive integers.

    • Iterate through the array and keep track of the longest switching subarray found so far.

    • Check if the numbers at even and odd positions are identical to determine a switching subarray.

    • Return the length of the longest switching subarray.

    • Example: For input [1, 4, 1, 4, 3, 2, 3, 0], the longest switching subarray is [1, 4, 1, 4] with le

  • Answered by AI
  • Q2. 

    Unique Frequency Problem Statement

    Given a string 'STR' with lowercase letters, determine the minimum number of deletions required to ensure that every letter in the string appears a unique number of time...

  • Ans. 

    The task is to find the minimum number of deletions needed in a string to ensure each character appears a unique number of times.

    • Iterate through the string and count the frequency of each character

    • Track the frequencies in a hashmap

    • Identify the characters with duplicate frequencies and calculate the minimum deletions needed

    • Return the minimum number of deletions for each test case

  • Answered by AI
Round 2 - HR 

Round duration - 40 minutes
Round difficulty - Easy

Amex came for two profiles - Tech Role and Analyst, 19 and 23 people respectively were shortlisted for the interviews. Fortunately, I was shortlisted for both the roles. I was asked basic question of C++ and it was majorly an HR Round

Round 3 - Telephonic Call 

Round duration - 20 minutes
Round difficulty - Easy

It was a fairly simple round conssting of 5 - 6 questions related to coding, puzzles and me.

What are your interests? 
What projects have you done and your field of interest?

Round 4 - Face to Face 

(1 Question)

Round duration - 50 minutes
Round difficulty - Easy

This round was purely technical
No introduction was done, straight to the point

My preference was the Tech Role, so as I was selected in this, I never had to give interviews for the Analyst role. In total 5 people were selected in the Analyst profile and 4 in the Tech profile.

In the end, I was offered a 6 months internship at Amex.

  • Q1. 

    Palindrome Linked List Detection

    Given a singly linked list of integers, determine if it is a palindrome. A linked list is considered a palindrome if it reads the same forward and backward.

    Example:

    Inp...
  • Ans. 

    Check if a singly linked list is a palindrome by comparing elements from both ends.

    • Traverse the linked list to find the middle point

    • Reverse the second half of the linked list

    • Compare the first half with the reversed second half to check for palindrome

    • Example: Input: 1 2 3 2 1 -1, Output: true

  • Answered by AI

Interview Preparation Tips

Professional and academic backgroundI completed Computer Science Engineering from Punjab Engineering College(Deemed To be University). I applied for the job as SDE - Intern in BangaloreEligibility criteria7 CGPAAmerican Express interview preparation:Topics to prepare for the interview - Data Structures, Algorithms, Operating System, DBMS, Dynamic Programming, BacktrackingTime required to prepare for the interview - 6 monthsInterview preparation tips for other job seekers

Tip 1 : Do practice a lot of data structures from renowned websites like LeetCode and also from CodeZen
Tip 2 : In your introduction, when asked, you just need to tell your life story.
Tip 3 : Maintain eye contact with the interviewers and clarify every details about the question before proceeding to the solution

Application resume tips for other job seekers

Tip 1: Add most recent and relevant projects only
Tip 2: you should know each and everything written on your resume

Final outcome of the interviewSelected

Skills evaluated in this interview

Software Developer Intern Interview Questions Asked at Other Companies

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Q5. Reverse Words in a String: Problem Statement You are given a stri ... read more

I was interviewed before Sep 2020.

Round 1 - Coding Test 

(2 Questions)

Round duration - 120 minutes
Round difficulty - Easy

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.

  • Q1. 

    Sliding Maximum Problem Statement

    Given an array of integers ARR of length 'N' and a positive integer 'K', find the maximum elements for each contiguous subarray of size K.

    Example:

    Input:
    ARR = [3, 4,...
  • Ans. 

    Implement a function to find maximum elements for each contiguous subarray of size K in an array of integers.

    • Iterate through the array and maintain a deque to store the indices of elements in decreasing order.

    • Pop elements from the deque that are out of the current window and add the maximum element to the result array.

    • Return the result array containing maximum elements for each subarray of size K.

  • Answered by AI
  • Q2. 

    Longest Substring with At Most K Distinct Characters

    Given a string S of length N and an integer K, find the length of the longest substring that contains at most K distinct characters.

    Input:

    The first...
  • Ans. 

    Find the length of the longest substring with at most K distinct characters in a given string.

    • Use a sliding window approach to keep track of the characters and their counts in the substring.

    • Maintain a hashmap to store the characters and their frequencies within the window.

    • Update the window size and characters count as you iterate through the string.

    • Keep track of the longest substring length with at most K distinct char...

  • Answered by AI
Round 2 - Face to Face 

Round duration - 45 minutes
Round difficulty - Easy

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

Round 3 - Telephonic Call 

(1 Question)

Round duration - 30 minutes
Round difficulty - Easy

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.

  • Q1. 

    Stack using Two Queues Problem Statement

    Develop a Stack Data Structure to store integer values using two Queues internally.

    Your stack implementation should provide these public functions:

    Explanation:

    ...
  • Ans. 

    Implement a stack using two queues to store integer values with specified functions.

    • Use two queues to simulate stack operations efficiently.

    • Maintain one queue for storing elements and another for temporary storage during push operation.

    • Ensure proper handling of edge cases like empty stack or invalid operations.

    • Example: Push operation involves transferring elements from one queue to another before adding the new element...

  • Answered by AI
Round 4 - Telephonic Call 

(2 Questions)

Round duration - 45 minutes
Round difficulty - Easy

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?

  • Q1. 

    Detect and Remove Loop in Linked List

    For a given singly linked list, identify if a loop exists and remove it, adjusting the linked list in place. Return the modified linked list.

    Expected Complexity:

    A...

  • Ans. 

    Detect and remove loop in a singly linked list in place with O(n) time complexity and O(1) space complexity.

    • Use Floyd's Cycle Detection Algorithm to identify the loop in the linked list.

    • Once the loop is detected, use two pointers to find the start of the loop.

    • Adjust the pointers to remove the loop and return the modified linked list.

  • Answered by AI
  • Q2. 

    Interval List Intersection Problem

    You are provided with two sorted lists of closed intervals, INTERVAL1 and INTERVAL2. A closed interval [x, y] (x < y) signifies the set of real numbers z such that x ...

  • Ans. 

    Find the intersections of two sorted lists of closed intervals.

    • Iterate through both interval lists to find intersections

    • Compare the intervals and find the common range

    • Handle cases where there is no intersection between intervals

  • Answered by AI

Interview Preparation Tips

Professional and academic backgroundI completed Computer Science Engineering from Netaji Subhas University Of Technology. Eligibility criteriaAbove 7 CGPAAmerican Express interview preparation:Topics to prepare for the interview - C++, Data Structures, Algorithms, Operating Systems, Object Oriented Programming, Database Management System, Computer NetworksTime required to prepare for the interview - 2.5 monthsInterview preparation tips for other job seekers

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 resume tips for other job seekers

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.

Final outcome of the interviewSelected

Skills evaluated in this interview

I was interviewed before Nov 2020.

Round 1 - Technical 

(1 Question)

  • Q1. 

    Travelling Salesman Problem

    Given a list of cities numbered from 0 to N-1 and a matrix DISTANCE consisting of 'N' rows and 'N' columns, representing the distances between each pair of cities, find the sho...

Interview Preparation Tips

Professional and academic backgroundI completed Computer Science Engineering from BIT Mesra. I applied for the job as SDE - Intern in BangaloreEligibility criteriaMust qualify the codability test sent to top performers of Makeathon
American Express interview Rounds:Round 1
Round type - Online Coding Interview
Round duration - 90 Minutes
Round difficulty - Medium
American Express interview preparation:Topics to prepare for the interview - Data Structures, Pointers, OOPS, Trees, Graphs , Algorithms, Dynamic Programming, Operating SystemTime required to prepare for the interview - 6 monthsInterview preparation tips for other job seekers

Tip 1 : Do competitive programming in 1st and 2nd yr
Tip 2 : Clear the basic of all data structures, algorithms and time, space complexities before trying leetcode.
Tip 3 : Dedicate 2-3 months to Interviewbit.

Application resume tips for other job seekers

Tip 1 : Have atleast 2 projects.
Tip 2 : Competitive Coding ranks gives advantage.

Final outcome of the interviewRejected

Skills evaluated in this interview

American Express interview questions for designations

 Software Developer

 (11)

 Full Stack Software Developer

 (2)

 Software Engineer Intern Trainee

 (1)

 Intern

 (2)

 Developer

 (1)

 Software Engineer

 (11)

 Analyst Intern

 (1)

 Product Intern

 (1)

Interview questions from similar companies

Software Developer Interview Questions & Answers

Visa user image Pranav Bhat Thirthahalli

posted on 3 Dec 2015

Interview Questionnaire 

14 Questions

  • Q1. What is race condition and how can it be eliminated
  • Ans. 

    Race condition is a situation where multiple threads/processes access and manipulate shared data simultaneously.

    • It can be eliminated by using synchronization techniques like locks, semaphores, and mutexes.

    • Another way is to use atomic operations that ensure the data is accessed and modified atomically.

    • Using thread-safe data structures can also prevent race conditions.

    • Example: Two threads trying to increment a shared var...

  • Answered by AI
  • Q2. What is JCube?
  • Ans. 

    JCube is a Java library for creating and manipulating Rubik's Cube puzzles.

    • JCube provides classes for representing Rubik's Cube puzzles and algorithms for solving them.

    • It supports various cube sizes and can generate random scrambles.

    • JCube can be used in Java applications or as a standalone command-line tool.

    • It is open source and available on GitHub.

  • Answered by AI
  • Q3. What is regression testing?
  • Ans. 

    Regression testing is the process of testing changes made to a software application to ensure that existing functionality still works.

    • It is performed after making changes to the software

    • It ensures that existing functionality is not affected by the changes

    • It helps to catch any defects or bugs that may have been introduced

    • It can be automated using testing tools

    • Examples include retesting after bug fixes, testing after new

  • Answered by AI
  • Q4. Discussion on different sorting techniques
  • Q5. Discussion on SQL and SQL optimisaion
  • Q6. Software engineering principles
  • Ans. 

    Software engineering principles are the best practices and guidelines for developing high-quality software.

    • Software should be designed with modularity and scalability in mind.

    • Code should be well-documented and easy to read.

    • Testing and debugging should be an integral part of the development process.

    • Version control should be used to manage code changes.

    • Security and privacy should be considered throughout the development

  • Answered by AI
  • Q7. Java and OOP's question
  • Q8. Define Singleton class
  • Ans. 

    A Singleton class is a class that can only have one instance at a time.

    • It restricts the instantiation of a class to a single object.

    • It provides a global point of access to that instance.

    • It is often used in situations where a single object is required to coordinate actions across a system.

    • Example: Database connection manager, Configuration manager, Logger manager.

  • Answered by AI
  • Q9. Explain Testing principles and Design principles
  • Ans. 

    Testing principles ensure software quality, while design principles guide software development.

    • Testing principles include unit testing, integration testing, and acceptance testing.

    • Design principles include SOLID, DRY, and KISS.

    • Testing principles ensure that software meets requirements and is free of defects.

    • Design principles guide software development to be modular, maintainable, and scalable.

  • Answered by AI
  • Q10. Types of machine learning and methods and examples, they may give you a situation and ask you which technique is good and why
  • Q11. Why choose you for VISA?
  • Ans. 

    I have the necessary skills, experience, and passion to contribute to VISA's success.

    • I have a strong background in software development and have worked on projects similar to those at VISA.

    • I am a quick learner and can adapt to new technologies and programming languages easily.

    • I am passionate about creating high-quality software that meets the needs of users and exceeds their expectations.

    • I am a team player and can work...

  • Answered by AI
  • Q12. Which profile is good for you?
  • Ans. 

    A profile that challenges me to learn and grow while allowing me to contribute to a team.

    • A position that encourages continuous learning and development

    • A role that allows me to collaborate with a team and contribute to projects

    • A company culture that aligns with my values and work ethic

  • Answered by AI
  • Q13. About the work culture at VISA Inc
  • Q14. If u already have a placement, why this company
  • Ans. 

    I am interested in exploring new opportunities and challenges that this company can offer.

    • I am impressed with the company's reputation and growth potential.

    • I am excited about the projects and technologies this company is working on.

    • I believe this company can provide me with a better work-life balance and career growth opportunities.

    • I am looking for a company culture that aligns with my values and goals.

    • I am open to exp...

  • Answered by AI

Interview Preparation Tips

Round: Test
Experience: Online Test on mettl.com
- 2 coding questions ( 15*2 = 30 marks ) - Moderate level
- 10 MCQs on Programming and Java ( 1*10 = 10)
- 6 MCQs on Machine Learning and Hadoop ( 1*6 = 6 )
- 6 MCQs on Computer Networks ( 1*6 = 6 )
- 6 MCQs on Computer Infrastructure and Architecture ( 1*6 = 6)
- 6 MCQs on Application security and Cryptography ( 1*6 = 6)
15 shortlisted from here including 8 B.Techs and 7 M.Techs for F2F interviews, which were taken by VISA employees from their US and Singapore offices( since they don't have any office at India ).

Round: Technical Interview
Experience: They may give you a situation and ask you to explain which Software engineering principles will you use. They ask you how will you explain the concept of stacks and queues to a 7 year old, or to a granny, so as to encourage programming(like seriously ? )

General Tips: Nothing as such, since this was my second on-campus placement, I had good experience of interviews.
Keep your fundamentals in all computer science subjects open. Unlike other companies they don't focus much on coding alone. The only other company which also looks at perfection in all computer science aspects is Xerox Research Center India.
Challenging and Equally rewarding, but seriously a unique experience with no much tension
Skills:
College Name: NIT Surathkal

Skills evaluated in this interview

Software Engineer Interview Questions & Answers

Visa user image Pranali Yawalkar

posted on 14 Dec 2015

Interview Questionnaire 

7 Questions

  • Q1. Discussion on my internships and course projects.
  • Q2. My field of interest, how well have I fared in it.
  • Q3. Design a mvc controller system where given a url, I am able to invoke the right controller. Eg, given "xyz.com/a/b/c", I should be able to invoke c controller by going through a and b
  • Q4. Design autocomplete in IDEs
  • Ans. 

    Autocomplete in IDEs helps developers write code faster by suggesting code snippets and completing code as they type.

    • Autocomplete should suggest code snippets based on the context of the code being written

    • Autocomplete should prioritize suggestions based on frequency of use

    • Autocomplete should also suggest variable and function names

    • Autocomplete should be customizable to allow for user-defined snippets and suggestions

    • Exa...

  • Answered by AI
  • Q5. What is my weakness
  • Ans. 

    My weakness is public speaking.

    • I tend to get nervous when speaking in front of large groups.

    • I am working on improving my public speaking skills by practicing and seeking feedback.

    • I have taken courses and attended workshops to help me overcome my fear of public speaking.

  • Answered by AI
  • Q6. Given 2 game scenarios for basketball, and given p as the probability of making a basket in an attempt, I have to understand the condition where game1 would be preferable over game2. In first game, I have ...
  • Ans. 

    Comparing 2 basketball game scenarios with different number of trials and baskets required to win

    • Calculate the probability of winning in each game scenario using binomial distribution formula

    • Compare the probabilities to determine which game scenario is preferable

    • In game1, the probability of winning is p. In game2, the probability of winning is the sum of probabilities of making 2 or 3 baskets

    • If p is high, game1 is pref...

  • Answered by AI
  • Q7. Given a dictionary of words, I have to go from one word to another in least number of transitions where a transition is a defined as changing any letter of the current word such that the new word is also i...

Interview Preparation Tips

Round: Test
Experience: The test was on hackerrank.
Tips: * Fast coding and problem solving required
* Time crunch
* The test is valued a LOT in the hiring process
Duration: 120 minutes
Total Questions: 4

Round: Technical Interview
Experience: Question 1 : He tried to take the discussion to web based technologies to which I straightly told I don’t know. Not sure if that was a good decision. Nevertheless, he went over my resume a lot of times and asked about various projects.
Question 2 : Discussed the various projects related to it.
Question 3 : He asked this question because I had worked on django during my FB internship. I proposed a tree based structure. xyz.com/a/b/c ---> b is child of a, c is child of b.

Question 4 : Next he moved to a very interesting question. Given a simple text editor, I want to facilitate autocomplete feature. We discussed about syntactic methods using language specific keywords. I suggested a trie based implementation which he liked. Later he asked me to improve and redirected me to using scope of the variables, and grammar of the language. We discussed about all the steps I did in language translators lab (macrojava -> minijava -> typechecking -> miniIR -> microIR -> miniRA ->Mips) where we built a Java compiler in Java. We later hopped back to original question and I suggested that we can use grammar to to store multiple (nested kind of) tries for different scope. He asked me how would I define “scope”. He gave me a scenario which helped me come up with the nested trie structure
int a;
{
int b;
{
int c; //a b c can be used
}
{
int d; //a b d can be used
}
}
He then asked me details of how I would code. I said we could use the respective visitors and maintain the current trie root for scope. He liked it but I missed at 2 places :
1. He asked me about token generation used in a compiler and I said flex and bison. I was expected to elaborate a bit.
2. He asked me how the grammar is generated and how the visitors are invoked. I couldn’t explain properly because I was not thorough with it.
Tips: * Keep smiling in the interviews.
* My interviewer had hopped from Microsoft to Visa. We had a short detailed discussion on how the transition was and what drove him to do that.
* It’s always good to know about the company to pick up interesting discussions, read up latest articles and news
* The interviewers want to see if you are passionate about what they are building. Their PPT (Pre Placement Talk) was also focussed majorly on the technologies they are building.
* If you take a question in a direction, make sure you are very very thorough with it. I took it in the direction of compilers, but couldn't make the transition seamlessly because I wasn't thorough with a lot of things (like token generation, visitor invocation).
* Not sure if telling upfront that you don't know about web technologies when you are applying for a profile that might need it is a good idea or not.


Round: Technical Interview
Experience: I think he was a senior person and spoke very passionately about the work that is happening in visa Bangalore office.

Question 1 : I said maybe I should have learnt a little about web based technologies. I think he was looking for a more generic answer.
Question 2 : I went ahead with calculating the expected score where my score random variable = 1 with probability p, and 0 with probability (1-p). I conditioned that expected score of game1 > game2 which would give me the range of p. I goofed up the equations twice but he said he liked my approach and I was just there

Question 3 : I suggested building a graph where a node is a word and an edge means a transition, and then performing BFS. He said that was obvious and that he was more interested in knowing how I build the graph. I suggested a method to reduce the number of string comparisons by storing a count vector with each word. Count vector is a 26 length vector where count[i] = number of times that letter occurs in the word. I would do string comparison to identify neighbours only if the difference in count vectors in 2. Eg, cot = cat - a + o. String comparison is still needed because of false positives. Eg, oct = cat - a + o but cat -> oct is not a valid transition. He liked my approach and asked me to code, discussed the complexity.
Tips: * Don't be naive around a senior engineer. Be confident.
* Explain your approach before going ahead solving it. I missed that in Q1 and for a long time he didn't know what I was heading towards.
* Write clean code, practice coding on paper to make sure you write compilable code. Shabby code is a turn off.
* Show passion for the company you are applying for.

General Tips: * Be friendly and keep smiling.
* Know about the company, well in detail. Recent news, articles, acquisitions, organisational changes, new offices, new product, etc.
* Know about the volume the company handles, certain mind boggling figures, what the company *does not* do
* If you are introducing yourself as an expert in a certain field, be prepared for questions like "How will you contribute to our company with your expertise" type of questions.
* Be very very thorough with every single thing you write on your resume. A small point you weren't sure about might become the basis of your whole interview. Don't write things you are unsure of, or have worked very little on.
Skill Tips: * I think I didn’t take Visa very seriously. I was assuming they won’t take a undergrad and they won’t take me because I have 0 knowledge in web based technologies. I might have acted a little cocky.
* They had nice pie diagrams which shows that they had done thorough research about each and every candidate based on resume and the coding test.
* They value the coding test a lot.
* Be very thorough with the projects you write on resume. They will give you a problem which won't be straightforward and will map onto one of your course projects. You are expected to do the mapping seamlessly. Every bit of the discussion you have with the interviewer can be your next problem.
* Brush up on web based technologies if you can.
* There will be a HR round as well if you clear the technical interviews.

Skills: Maths(esp Probability), Design, Passion, Web Technologies, Technical Skill And Speaking Skill, Coding Skills
College Name: IIT Madras
Motivation: * Been the leader since more than half a century, been through the technological revolution.
* Revolutionising payments architecture. Building something of greatest need, so elegant and optimised, yet producing such consistent performance.
* Keeping up with the need of the generation by introducing features which are brand new. Eg, “all-purpose credit card”.
* Loved their PPT (Pre Placement Talk). Volume of the data and processing is IMMENSE. Billions of transactions in a year voluming up to trillions. More than 200 countries in the world --> these stats are HUGE.
* Fraud detection is a space I would have loved to work on given that I come from a Data Mining background.

Funny Moments: Chucked out before HR round :P

Skills evaluated in this interview

Interview Questionnaire 

2 Questions

  • Q1. Why would you like to join Visa and why?
  • Q2. Tell me about yourself

Interview Preparation Tips

Round: Test
Experience: Coding Questions were fairly standard ones.
Duration: 75 minutes
Total Questions: 42

Round: Interview
Experience: Networks based questions, firewalls, TCP/IP and other OSI layers

Round: Interview
Experience: Coding questions. Asked to code on paper. Questions on Object Oriented Design.

Skills: Networks basics, OOPs basics, Coding Skills
College Name: IIT Guwahati
Motivation: Profiles offered&#44; Package, Location

Interview Preparation Tips

Round: Test
Experience: Questions on
1. Programming: 10 Questions2. Machine Learning Hadoop MCQ: 6 Questions3. Networking MCQ: 6 Questions4. Operating System: 6 Questions5. Infrastructure: 6 Questions6. Application Security: 6 Questions
Tips: Questions were simple , except sections 2,5 unless you have a basic idea about it.
Duration: 75 minutes
Total Questions: 34+2

Round: Technical Interview
Experience: – Projects, Internship– Asymmetric and Symmetric encryption with some real world usage– Concepts behind Digital Signature and Digital Certificates– Detailed discussion on HTTPS– Basic OS concepts : Threads, Mutex , Semaphores– Basic OOPS concepts : Virtual functions , Function overloading and overriding , encapsulation.
Tips: Focus on Network Security concepts !

Round: Technical Interview
Experience: – Projects , Internship– Some discussion on Testing and how you would design a unit test case and a complete project test case. Discussion on Automated Testing.– How does a Web application work.– Software Development Models– Discussion on interpreted language and compiled language– Some DBMS basics for efficiency :- Indexing viz. B+trees , Hashing.– Some discussion on Apple Pay , VbV (Verified by Visa) (informal)

Round: HR Interview
Experience: Basic HR questions !

General Tips: Confidence is the key along with sufficient coding practice both on the IDE and pen-paper.
Skills: Network Security, Programming, Algorithms, Operating System
College Name: IIT ROORKEE

I applied via Campus Placement and was interviewed in Dec 2016. There were 5 interview rounds.

Interview Questionnaire 

7 Questions

  • Q1. Given an array, Implement Binary search tree
  • Ans. 

    Implement Binary Search Tree using given array of strings.

    • Sort the array in ascending order

    • Find the middle element and make it the root of the tree

    • Recursively create left and right subtrees using the left and right halves of the array

    • Repeat until all elements are added to the tree

  • Answered by AI
  • Q2. Given the above Binary search tree, print in ascending order
  • Ans. 

    Print the given Binary search tree in ascending order

    • Traverse the left subtree recursively

    • Print the root node

    • Traverse the right subtree recursively

  • Answered by AI
  • Q3. Given an array of stock prices, find where to buy and where to sell for maximum profit in O(n)
  • Ans. 

    Find buy and sell points for maximum profit in an array of stock prices in O(n)

    • Iterate through the array and keep track of the minimum price seen so far

    • Calculate the profit at each index by subtracting the minimum price from the current price

    • Update the maximum profit and buy/sell points accordingly

    • Return the buy and sell points for maximum profit

  • Answered by AI
  • Q4. Resume based
  • Q5. What are three problems Chennai faces?
  • Ans. 

    Chennai faces problems related to water scarcity, traffic congestion, and pollution.

    • Water scarcity due to inadequate rainfall and poor management of water resources.

    • Traffic congestion due to the increasing number of vehicles and poor road infrastructure.

    • Pollution caused by industries, vehicular emissions, and improper waste disposal.

  • Answered by AI
  • Q6. Which one would you solve and how and why?
  • Ans. 

    Need more context on the question to provide an answer.

    • Please provide more information on the problem to be solved.

    • Without context, it is difficult to provide a solution.

    • Can you please provide more details on the problem statement?

  • Answered by AI
  • Q7. What is most interesting thing about Visa?
  • Ans. 

    Visa is a global payments technology company that connects consumers, businesses, banks and governments in more than 200 countries and territories.

    • Visa operates the world's largest retail electronic payments network.

    • VisaNet, the company's global processing system, handles more than 65,000 transaction messages a second.

    • Visa is constantly innovating to improve payment security and convenience, with initiatives such as Vi...

  • Answered by AI

Interview Preparation Tips

Round: Test
Experience: 4 Coding questions on Hackerrank platform, one and half hour time. I am not going to reveal the questions here, but one was a basic binary tree implementation and the other three were algorithmic and mathematical problems. They were kinda hard to solve in an hour and half. I could do only 1 and half of the other one. I got 115/300 points on that. I was one of the 16 people selected for the interview.
Tips: It all depends on how well you can focus on the test day. Just practice a lot on hackerrank.
Duration: 1 hour 30 minutes
Total Questions: 4

Round: Technical Interview
Experience: The first two questions I was able to do fast enough. I was also asked a few questions on my resume and coding-related internship. The last one, I showed an O(n*n) algorithm first and then modified it to O(n). Around 45 minutes.
Tips: Be thorough on the coding part in your resume. Think out aloud!

Round: Technical + HR Interview
Experience: Just a few normal questions regarding my projects and my favorite course and it's application to Visa. 15 minutes.
Tips: Once again, be thorough on your resume.

Round: HR Interview
Experience: Once again a normal round, just random questions as to whether I am interested and good enough in communication. 15 minutes.
Tips: Don't get shaken. Be ready for all kinds of questions. Especially about Visa relation to what you do

Skills: Smart Coding
College Name: IIT Madras

Skills evaluated in this interview

Interview Questionnaire 

1 Question

  • Q1. Tell me about your project ( written in language)?
  • Ans. 

    Developed a web application using Python and Django framework for managing inventory and sales.

    • Used Python programming language for backend development

    • Implemented Django framework for building web application

    • Designed database schema for inventory and sales data

    • Integrated frontend using HTML, CSS, and JavaScript

    • Implemented user authentication and authorization features

  • Answered by AI

Interview Preparation Tips

Round: Test
Experience: They asked 3 question on data structures .
1.Merging linekd list
2 and 3 BST related
Duration: 1 hour
Total Questions: 3

Round: Technical Interview
Experience: Interviewer asked me to explain projects which I had mentioned in Resume. Then He asked me to implement a problem on basis of my project.
It was telephonic round.
CGPA and my project mattered.

College Name: IIT Roorkee

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