Hitachi Payment Services Linux Engineer Interview Questions and Answers

Exam to test reasoning and aptitude, and speed to answer them

Dsa question easy to medium level

Q1. Just culture fit question, and medium dsa questions
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Q2. Print pyramid from Fibonacci sequence
Ans. 
Print pyramid from Fibonacci sequence
• Generate Fibonacci sequence up to a certain number

• Use the Fibonacci numbers to create the pyramid structure

• Print each row of the pyramid with appropriate spacing
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Q3. Linked list sort
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Q4. Design SQL tables for library management system
Ans. 
Design SQL tables for library management system
• Create tables for books, authors, members, transactions, etc.

• Use primary and foreign keys to establish relationships between tables

• Include columns like book title, author name, member ID, due date, etc.
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Q5. Valid bracket dsa question
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Java , Spring, SQL questions asked without one data structure basic live coding question

Q1. What are your expectation to work with us
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Q2. How will you manage to improve with us
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It consist of 4 DSA ques and few quiz and opps concept based ques
1st was string based Medium level ques.
2nd was a ques based on 2 pointer
And other 2 was from Vector and Linked list easy ques

Q1. It was stock buy and sell ques on leetcode where we need to find Max profit and what day to buy and sell
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Q2. 2d array ques to print natural numbers in spiral form
Ans. 
Print natural numbers in spiral form using a 2D array.
• Create a 2D array with dimensions n x n.

• Initialize variables for row and column boundaries.

• Iterate through the array in a spiral pattern, filling in natural numbers.
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Q3. Hard level linked list ques
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Q1. Concurrent modification exception Java multithreading java collection framework oops
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Round duration - 90 minutes
Round difficulty - Medium

Contained mix of coding, oops and general programming questions

Coding was live coding round
It was around 12pm
They used their own coding environment, I coded in java

Q1. 
Maximum Subarray Sum Problem Statement
Given an array arr of length N consisting of integers, find the sum of the subarray (including empty subarray) with the maximum sum among all subarrays.
Explanation...read more
Ans. 
Find the sum of the subarray with the maximum sum among all subarrays in an array of integers.
• Iterate through the array and keep track of the maximum sum subarray seen so far.

• Use Kadane's algorithm to efficiently find the maximum subarray sum.

• Consider the case where all elements in the array are negative.

• Handle the case where the array contains only one element.
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Round duration - 90 Minutes
Round difficulty - Hard

It was a collection of HLD AND LLD
Was around 12pm
This was conducted on bluejeans

Q1. Design a URL shortener with a database and all necessary components.
Ans. 
Design a URL shortener with database and necessary components
• Use a unique identifier for each URL to generate short links

• Store the original URL and corresponding short link in a database

• Implement a redirect mechanism to redirect short links to original URLs

• Consider implementing analytics to track usage and performance

• Ensure scalability and reliability of the system
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Round duration - 60 Minutes
Round difficulty - Easy

It was a friendly managerial round with director of my team, he was very for me to come on board and explained truthfully how payu is.

Round duration - 30 Minutes
Round difficulty - Easy

Just a normal HR discussion, he informed me that I've been selected and we discussed about the salary part

Q1. Can you describe your experience working in a corporate environment?
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Q1. Just to know more about why i want the role
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Testing an payment flow on the application