Hitachi Payment Services Support Engineer Interview Questions and Answers

Q1. DSA round containing 2 coding questions along with some Java Questions
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Q1. Design Round along with some puzzles
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Q1. Managerial Round
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Round duration - 60 Minutes
Round difficulty - Medium

Time - afternoon. 
Interviewer jumped straight into interview, formal and comfortable environment. 
1. Interviewer introduction 
2. Interviewee introduction
3. Coding question 1 - difficulty medium, topic - arrays
- explain approach, write code (pseudo code is fine), dry run on given TCS. 
4. Coding question 2 - same as above, only question was different. Slightly more difficult but on arrays only. 
5. Questions on Python & Django - difficulty medium - write code related to queryset on django objects
6. SQL question to code - 10th highest salary.

Q1. 
Reverse Only Letters Problem Statement
You are given a string S. The task is to reverse the letters of the string while keeping non-alphabet characters in their original position.
Example:
Input:
S = "...read more
Ans. 
Reverse the letters of a string while keeping non-alphabet characters in their original position.
• Iterate through the string and store the non-alphabet characters in their original positions

• Reverse the letters of the string using two pointers technique

• Combine the reversed letters with the non-alphabet characters to get the final reversed string
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Q2. 
Alternate Positive and Negative Numbers
Given an array arr that contains an equal number of positive and negative elements, rearrange the given array such that positive and negative numbers are arranged a...read more
Ans. 
Rearrange an array with equal positive and negative numbers alternatively while maintaining relative order.
• Iterate through the array and separate positive and negative numbers into two separate arrays.

• Merge the two arrays alternatively into the original array.

• Ensure the relative order of positive and negative numbers is maintained.
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Round duration - 60 Minutes
Round difficulty - Medium

1. Intro of interviewer
2. Intro of interviewee
3. Questions on Python - decorators, static method, class methods
4. Principal of coding, best practices
5. Question on DB - What is indexing, how to improve, best use of indexing.
6. Questions on django - what is django ORM, What is sandbox, Django models, Django queries.
7. Previous job, what do you do, stack you work on.

Very friendly environment, very pleasing person, loved it.

Q1. Concurrent modification exception Java multithreading java collection framework oops
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First round is completely based on aptitude, reasoning, English comprehension and 1 DSA question.

It was realted to analytical and logic reasoning topics

It's related to DSA topics

Q1. Types of Polymorphism
Ans. 
Polymorphism in programming refers to the ability of a single function or method to operate on different types of data.
• There are two main types of polymorphism: compile-time (static) polymorphism and runtime (dynamic) polymorphism.

• Compile-time polymorphism is achieved through function overloading and operator overloading.

• Runtime polymorphism is achieved through inheritance and virtual functions.

• Example of compile-time ...read more
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Q2. SQL based questions
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