Crif Solutions Software Developer Interview Questions and Answers

To find the maximum water pond formed between buildings.

• Identify the lowest point between the buildings.

• Calculate the area of the pond using the distance between the buildings and the depth of the pond.

• Consider any obstacles or uneven ground that may affect the pond's shape.

• Use a surveying tool or satellite imagery to get accurate measurements.

• Take into account any drainage systems or natural water flow that may affect

Design a dictionary using trie with insert, update and delete operations.

• Implement a Trie data structure with nodes containing a character and a boolean flag to indicate end of word

• For insert operation, traverse the trie and add nodes for each character in the word

• For update operation, delete the existing word and insert the updated word

• For delete operation, mark the end of word flag as false and delete the node if it ...read more

Find subset of numbers in array that sum up to zero.

• Use a nested loop to iterate through all possible subsets.

• Calculate the sum of each subset and check if it equals zero.

• Store the subset if the sum is zero.

• Optimize the solution by using a hash set to store the cumulative sum of elements.

BFS (Breadth-First Search) is a graph traversal algorithm that explores all the vertices of a graph in breadth-first order.

• BFS starts at a given vertex and explores all its neighbors before moving to the next level of vertices.

• It uses a queue data structure to keep track of the vertices to be visited.

• BFS guarantees that it visits all the vertices of a connected graph.

• It can be used to find the shortest path between two

In 5 years, I see myself as a highly skilled software developer, leading a team and contributing to innovative projects.

• Continuously improving my technical skills through learning and hands-on experience

• Taking on leadership roles and mentoring junior developers

• Contributing to the development of cutting-edge software solutions

• Building strong relationships with clients and stakeholders

• Staying updated with the latest indu...read more

Object Oriented Programming is a programming paradigm that uses objects to represent real-world entities.

• Encapsulation: bundling data and methods that operate on that data within one unit

• Inheritance: creating new classes from existing ones, inheriting their properties and methods

• Polymorphism: ability of objects to take on multiple forms or behaviors

• Abstraction: hiding complex implementation details and providing a simp...read more

Abstraction is hiding implementation details while polymorphism is using a single interface for multiple types.

• Abstraction: Encapsulation, Interfaces, Abstract classes

• Polymorphism: Method Overloading, Method Overriding, Interfaces

• Abstraction Example: Car - we don't need to know how the engine works to drive it

• Polymorphism Example: Animal - different animals have different sounds but they all have a 'makeSound' method

PayPal is an online payment system that allows individuals and businesses to transfer funds electronically.

• Allows users to make payments and money transfers online

• Offers a secure and convenient way to pay for goods and services

• Provides a platform for businesses to accept payments online

• Offers buyer and seller protection for eligible transactions

• Can be used to send and receive money internationally

I am excited to join PayPal because of its innovative culture and impact on the global economy.

• PayPal's commitment to innovation aligns with my passion for staying up-to-date with the latest technologies.

• I am impressed by PayPal's global reach and impact on the economy, and I want to be a part of that.

• I appreciate PayPal's focus on diversity and inclusion, and I believe in the importance of working for a company with s...read more

Find the odd repeating element from an array of strings

• Use a hash table to count the frequency of each element

• Iterate through the hash table to find the element with an odd count

Finding an element in a sorted 2D matrix

• Start from the top right corner or bottom left corner

• Compare the target element with the current element

• Move left or down if the target is smaller, else move right or up

• Repeat until the target is found or all elements are checked

SQL query to find Nth highest salary from table

• Use ORDER BY and LIMIT clauses

• Use subquery to get the Nth highest salary

• Handle cases where there are less than N distinct salaries

Function to swap '3' and '4' without using if-else

• Use XOR operator to swap the values

• Convert the input to ASCII code and perform the swap

• Use a lookup table to map the values

I am a software developer with experience in Java and Python.

• Proficient in Java and Python programming languages

• Experience in developing web applications using Spring framework

• Familiarity with database management systems like MySQL and MongoDB

PAYTM is a leading digital payment platform in India with a wide range of services.

• PAYTM has a user-friendly interface and offers a seamless payment experience.

• It provides a variety of services like mobile recharges, bill payments, and online shopping.

• PAYTM has a strong focus on security and fraud prevention measures.

• It has a large user base and is widely accepted by merchants across India.

• PAYTM is constantly innovatin...read more

Yes, I am open to pursuing further studies in the future.

• I believe in continuous learning and staying updated with the latest technologies.

• Further studies can help me specialize in a particular field and enhance my skills.

• I may consider pursuing a master's degree in computer science or a related field.

• However, my immediate focus is on gaining practical experience and contributing to the organization.

PAYTM grew fast due to its innovative approach and early adoption of digital payments.

• Early adoption of digital payments in India

• Innovative approach with features like mobile recharges, bill payments, and cashback offers

• Expansion into e-commerce and financial services

• Strategic partnerships with major companies like Uber and Alibaba