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AML stands for Anti-Money Laundering. CDD (Customer Due Diligence) and EDD (Enhanced Due Diligence) are processes conducted to identify and verify customers to prevent money laundering and terrorist financing.
AML is a set of regulations and procedures designed to prevent money laundering and terrorist financing.
CDD involves verifying the identity of customers, assessing their risk level, and monitoring their transactio...
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I was interviewed in Jun 2017.
Ajax calls allow for asynchronous communication between client and server without reloading the page.
Ajax stands for Asynchronous JavaScript and XML
Uses XMLHttpRequest object to send and receive data
Allows for partial page updates without reloading the entire page
Can handle data in various formats such as JSON, XML, HTML, and plain text
Example: $.ajax({url: 'example.com', success: function(data){console.log(data)}});
REST is lightweight and uses HTTP while SOAP is XML-based and has more features.
REST uses HTTP methods like GET, POST, PUT, DELETE while SOAP uses XML messaging.
REST is stateless while SOAP can maintain state.
REST is faster and easier to use while SOAP is more secure and reliable.
REST is used for web services while SOAP is used for enterprise-level services.
Example of REST: Twitter API. Example of SOAP: Amazon Web Serv
GET and POST are HTTP methods used for sending data to a server.
GET is used to retrieve data from a server
POST is used to submit data to a server
GET requests can be cached and bookmarked
POST requests are not cached and cannot be bookmarked
GET requests have length restrictions
POST requests have no length restrictions
GET requests are less secure than POST requests
Observer pattern is a design pattern in which an object maintains a list of its dependents and notifies them automatically of any state changes.
Also known as publish-subscribe pattern
Used in event-driven systems
Allows loose coupling between objects
Example: A weather station broadcasts weather updates to multiple displays
Example: A stock market ticker notifies multiple investors of stock price changes
Singleton is a design pattern that restricts the instantiation of a class to a single object.
Singleton ensures that only one instance of a class exists in the entire application.
It provides a global point of access to the instance.
Commonly used in scenarios where a single instance needs to coordinate actions across the system.
Example: Database connection manager, logger, configuration manager.
Immutable in Java refers to objects whose state cannot be changed after creation.
String, Integer, and other wrapper classes are immutable in Java.
Immutable objects are thread-safe and can be shared without synchronization.
To create an immutable class, make all fields final and private, and don't provide setters.
Examples of immutable classes in Java include LocalDate, LocalTime, and LocalDateTime.
Creating immutable in Java
Use final keyword to make variables immutable
Use private constructor to prevent object modification
Use defensive copying to prevent modification of mutable objects
Use enum to create immutable objects
Use String class to create immutable strings
Dependency injection is a design pattern that allows objects to receive dependencies rather than creating them internally.
It helps to decouple the code and makes it more testable and maintainable.
It allows for easier swapping of dependencies without changing the code.
There are three types of dependency injection: constructor injection, setter injection, and interface injection.
Example: Instead of creating a database co...
CORS stands for Cross-Origin Resource Sharing. It is a security feature implemented in web browsers to restrict access to resources from different origins.
CORS allows web servers to specify which origins are allowed to access its resources
It is implemented using HTTP headers
CORS prevents malicious websites from accessing sensitive data from other websites
Examples of resources that may be restricted by CORS include cook
CORS can be overcome by configuring the server to allow cross-origin requests.
Configure the server to include the Access-Control-Allow-Origin header
Use JSONP (JSON with Padding) to bypass CORS restrictions
Use a proxy server to make the request on behalf of the client
Use a browser extension to disable CORS restrictions during development
Use a server-side proxy to forward requests to the target server
I applied via Campus Placement
I applied via Referral
My biggest achievement till date is successfully leading a team to develop and launch a new software product ahead of schedule.
Led a team of developers to create a new software product
Completed the project ahead of schedule
Received positive feedback from clients and stakeholders
I would address conflicts directly and respectfully, seeking to understand the root cause and find a mutually beneficial solution.
Listen actively to understand the other person's perspective
Communicate clearly and respectfully
Identify the root cause of the conflict
Brainstorm potential solutions together
Be willing to compromise and find a mutually beneficial solution
Success is achieving personal goals, feeling fulfilled, and making a positive impact.
Success is subjective and can vary from person to person.
It involves setting and achieving goals, both short-term and long-term.
Feeling fulfilled and content with one's accomplishments is a key aspect of success.
Making a positive impact on others or the world can also be a measure of success.
Success is not just about material wealth or...
Dijkstra's algorithm finds the shortest path between nodes in a graph.
Create a graph with nodes and edges
Assign a tentative distance to each node
Set the initial node as current and mark it visited
For each neighbor of the current node, calculate the tentative distance
If the tentative distance is less than the current distance, update the distance
Mark the current node as visited and select the unvisited node with the sma...
A program to reverse a singly linked list
Create a new empty linked list
Traverse the original linked list and insert each node at the beginning of the new list
Return the new list
Methods to find nth largest element in an unsorted linked list
Traverse the linked list and store elements in an array, sort the array and return the nth largest element
Use quickselect algorithm to find the nth largest element in O(n) time complexity
Implement a max heap and extract the nth largest element
Divide the linked list into smaller sublists and recursively find the nth largest element
Use merge sort to sort the l
A prime number is a number that is divisible only by 1 and itself.
A prime number has exactly two factors: 1 and itself.
Prime numbers cannot be divided evenly by any other number.
Examples of prime numbers include 2, 3, 5, 7, 11, 13, 17, etc.
Test cases for a bank transaction
Transaction amount within account balance limit
Transaction amount exceeds account balance limit
Transaction to a valid account number
Transaction to an invalid account number
Transaction with correct transaction code
Transaction with incorrect transaction code
Transaction during bank working hours
Transaction outside bank working hours
Design classes for educational institutions in a city
Identify the main entities: schools, students, teachers, courses
Create a School class with attributes like name, address, and a list of students and teachers
Create a Student class with attributes like name, age, and a list of courses
Create a Teacher class with attributes like name, specialization, and a list of courses
Create a Course class with attributes like name, ...
I applied via Campus Placement and was interviewed in Dec 2016. There were 5 interview rounds.
Paypal is a leading online payment platform with a strong reputation and global presence.
Paypal is a well-established and trusted online payment platform used by millions of users worldwide.
It offers secure and convenient payment options for both individuals and businesses.
Paypal has a strong focus on innovation and technology, making it an exciting place to work for software engineers.
Working at Paypal provides opport...
Paypal is a digital payment platform that allows individuals and businesses to make online transactions.
Paypal provides a secure way to send and receive money online.
It allows users to link their bank accounts, credit cards, or debit cards to their Paypal account.
Users can make payments to merchants or individuals using their Paypal balance or linked payment methods.
Paypal offers buyer and seller protection, dispute re...
In 5 years, I see myself as a senior software engineer leading a team of developers on innovative projects.
Continuing to enhance my technical skills and knowledge through ongoing learning and certifications
Taking on more leadership responsibilities and mentoring junior team members
Contributing to the development of cutting-edge software solutions
Building strong relationships with colleagues and stakeholders to drive pr
I applied via Campus Placement and was interviewed in Dec 2016. There were 5 interview rounds.
Detecting loop in a linked list
Use two pointers, one moving one node at a time and the other moving two nodes at a time
If there is a loop, the two pointers will eventually meet
If any of the pointers reach the end of the list, there is no loop
DFS (Depth-First Search) is a graph traversal algorithm that explores as far as possible along each branch before backtracking.
DFS uses a stack to keep track of visited nodes and explore adjacent nodes.
It can be implemented recursively or iteratively.
DFS is useful for solving problems like finding connected components, detecting cycles, and solving mazes.
To find a cycle in a graph, use depth-first search (DFS) and keep track of visited nodes.
Implement DFS algorithm to traverse the graph
Maintain a visited array to keep track of visited nodes
If a visited node is encountered again during DFS, a cycle exists
Hashing is a process of converting data into a fixed-size numerical value called a hash code.
Hashing is used to quickly retrieve data from large datasets.
It is commonly used in data structures like hash tables and hash maps.
Hash functions should be fast, deterministic, and produce unique hash codes for different inputs.
Examples of hash functions include MD5, SHA-1, and SHA-256.
The question asks for the number of pairs between 1 and N that satisfy a specific mathematical relation.
The relation is pow(a,3) + pow(b,3) = pow(c,3) + pow(d,3)
The values of a, b, c, and d should be less than or equal to N
Count the number of pairs that satisfy the relation
Merge sort is a divide-and-conquer algorithm that recursively divides an array into two halves, sorts them, and then merges them.
Divide the array into two halves
Recursively sort each half
Merge the sorted halves back together
Repeat until the entire array is sorted
I want to join PayPal because of its innovative technology, global impact, and strong company culture.
Innovative technology - PayPal is known for its cutting-edge technology and digital payment solutions.
Global impact - Working at PayPal would allow me to contribute to a company that has a worldwide reach and influence.
Strong company culture - I value a company that prioritizes diversity, inclusion, and employee well-b...
I recently learned about the benefits of using Docker for containerization.
Docker allows for easy packaging and deployment of applications
It helps in creating consistent environments across different platforms
Docker containers are lightweight and efficient
Example: I used Docker to containerize a microservices architecture for a recent project
I was interviewed before Jan 2021.
Round duration - 90 minutes
Round difficulty - Medium
This was an online test for 90 minutes. 2 programming questions and MCQs related to CS fundamentals were asked.
Determine if a given singly linked list of integers forms a cycle or not.
A cycle in a linked list occurs when a node's next
points back to a previous node in the ...
Detect if a singly linked list forms a cycle by checking if a node's next points back to a previous node.
Traverse the linked list using two pointers, one moving one step at a time and the other moving two steps at a time.
If the two pointers meet at any point, it indicates the presence of a cycle in the linked list.
If one of the pointers reaches the end of the list (null), it means there is no cycle.
Given a string ‘str’, find the minimum number of partitions needed such that every segment of the string is a palindrome.
The task is to make cuts in the stri...
Find the minimum number of partitions needed in a string such that every segment is a palindrome.
Iterate through the string and check for palindromes at each possible partition point.
Use dynamic programming to keep track of the minimum cuts needed.
Consider edge cases where the string is already a palindrome or consists of different characters only.
Round duration - 60 minutes
Round difficulty - Medium
Technical round that lasted for around 60 minutes. The interviewer asked questions related to data structures and algorithms.
Given an undirected and disconnected graph G(V, E)
, where V
is the number of vertices and E
is the number of edges, the connections between vertices are provided in the 'GR...
DFS traversal problem on an undirected and disconnected graph to find connected components.
Perform Depth First Search (DFS) on each vertex to find connected components
Use a visited array to keep track of visited vertices
Print the number of connected components and list vertices in ascending order for each component
You are provided with an undirected graph containing 'N' vertices and 'M' edges. The vertices are numbered from 1 to 'N'. Your objective is to determi...
Detect cycles in an undirected graph with given vertices and edges.
Use Depth First Search (DFS) to traverse the graph and detect cycles.
Maintain a visited array to keep track of visited vertices and a parent array to keep track of the parent of each vertex.
If while traversing, you encounter a visited vertex that is not the parent of the current vertex, then a cycle exists.
Consider edge cases like disconnected graphs an
Round duration - 60 minutes
Round difficulty - Medium
Technical round that lasted for around 60 minutes. The interviewer asked questions related to data structures and algorithms.
You are given a sequence of numbers, ARR
. Your task is to return a sorted sequence of ARR
in non-descending order using the Merge Sort algorithm.
The Merge Sort...
Implement Merge Sort algorithm to sort a sequence of numbers in non-descending order.
Implement the Merge Sort algorithm using a Divide and Conquer approach
Recursively divide the input array into two halves until the size of each array is 1
Merge the sorted halves to produce a completely sorted array
Ensure the output is in non-descending order
Given an array ARR
of N
elements, your task is to find the maximum difference between any two elements in ARR
.
If the maximum difference is even, print EVEN; if it is...
Find the maximum difference between any two elements in an array and determine if it is even or odd.
Iterate through the array to find the maximum and minimum elements
Calculate the difference between the maximum and minimum elements
Check if the difference is even or odd and return the result
Hashing is a process of converting input data into a fixed-size string of bytes using a hash function.
Hashing is used to securely store passwords by converting them into a hash value before storing in a database.
Hashing is used in data structures like hash tables to quickly retrieve data based on a key.
Common hash functions include MD5, SHA-1, and SHA-256.
Hashing can be implemented in programming languages like Python
Tip 1 : Must do Previously asked Interview as well as Online Test Questions.
Tip 2 : Go through all the previous interview experiences from Codestudio and Leetcode.
Tip 3 : Do at-least 2 good projects and you must know every bit of them.:
Tip 1 : Have at-least 2 good projects explained in short with all important points covered.
Tip 2 : Every skill must be mentioned.
Tip 3 : Focus on skills, projects and experiences more.
I was interviewed before Jan 2021.
Round duration - 60 minutes
Round difficulty - Easy
Technical Interview round where the interviewer asked questions based on Data structures and algorithms.
Given a Singly Linked List of integers, your task is to reverse the Linked List by altering the links between the nodes.
The first line of input is an intege...
Reverse a singly linked list by altering the links between nodes.
Iterate through the linked list and reverse the links between nodes.
Use three pointers to keep track of the current, previous, and next nodes.
Update the links between nodes to reverse the list.
Return the head of the reversed linked list.
Given an undirected graph with ‘V’ vertices (labeled 0, 1, ... , V-1) and ‘E’ edges, where each edge has a weight representing the distance between two connected nodes (X,...
Dijkstra's algorithm is used to find the shortest path from a source node to all other nodes in a graph with weighted edges.
Implement Dijkstra's algorithm to find the shortest path distances from the source node to all other nodes.
Use a priority queue to efficiently select the next node with the shortest distance.
Update the distances of neighboring nodes based on the current node's distance and edge weights.
Handle disc...
Round duration - 60 minutes
Round difficulty - Easy
Technical Interview round where the interviewer asked questions based on Data structures and algorithms.
Given a Singly Linked List of integers that are sorted based on their absolute values, the task is to sort the linked list based on the actual values.
The absolute...
Sort a Singly Linked List based on actual values instead of absolute values.
Traverse the linked list and store the values in an array.
Sort the array based on actual values.
Update the linked list with the sorted values.
Given an array containing N
distinct positive integers and a number K
, determine the Kth largest element in the array.
N = 6, K = 3, array = [2, 1, 5, 6, 3, ...
Find the Kth largest element in an array of distinct positive integers.
Sort the array in non-increasing order to easily find the Kth largest element.
Ensure all elements in the array are distinct for accurate results.
Handle multiple test cases efficiently by iterating through each case.
Round duration - 30 minutes
Round difficulty - Easy
HR Round that lasted for around 30 minutes. The interviewer asked questions to know more about me.
Tip 1 : Must do Previously asked Interview as well as Online Test Questions.
Tip 2 : Go through all the previous interview experiences from Codestudio and Leetcode.
Tip 3 : Do at-least 2 good projects and you must know every bit of them.
Tip 1 : Have at-least 2 good projects explained in short with all important points covered.
Tip 2 : Every skill must be mentioned.
Tip 3 : Focus on skills, projects and experiences more.
I applied via Campus Placement and was interviewed in Dec 2016. There were 5 interview rounds.
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
Print the given Binary search tree in ascending order
Traverse the left subtree recursively
Print the root node
Traverse the right subtree recursively
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
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.
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?
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...
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