Iris Software Senior Sdet Engineer Interview Questions and Answers

Q1. Questions based on java collections
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Java Coding Test dsa program and all that

Reverse of string and largest number in an array

Q1. Java oops concepts, strings, arrays
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Q2. Selenium xpaths, concepts and some other technical stuff
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Q1. Simple xpath without using Index reverse strings with words separately
Ans. 
Reverse strings with words separately using simple xpath without using index
• Use XPath function to split the string into words

• Reverse each word individually using XPath function

• Concatenate the reversed words back together
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Q1. Django in depth questions
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Q2. Django ORM related questions
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Q1. Automate calendar
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Q2. OOps concept in java
Ans. 
Object-oriented programming concepts in Java focus on classes, objects, inheritance, encapsulation, and polymorphism.
• Classes are blueprints for objects

• Objects are instances of classes

• Inheritance allows a class to inherit properties and behaviors from another class

• Encapsulation hides the internal state of an object and only exposes necessary functionalities

• Polymorphism allows objects to be treated as instances of their
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Recerse string using java

Q1. Tell me all oops features
Ans. 
Object-oriented programming features include encapsulation, inheritance, polymorphism, and abstraction.
• Encapsulation: Bundling data and methods that operate on the data into a single unit (class).

• Inheritance: Ability for a class to inherit properties and behavior from another class.

• Polymorphism: Ability for objects of different classes to respond to the same message in different ways.

• Abstraction: Hiding the complex imp...read more
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Round duration - 90 Minutes
Round difficulty - Easy

In this round, there are a total of 16 questions and the time given was 90 mins.

3 Coding questions – Easy, Medium, and Hard.
13 MCQs based on outputs, Computer fundamentals, Aptitude.

Q1. 
N Queens Problem Statement
You are provided with an integer 'N'. For an 'N' x 'N' chessboard, determine how to position 'N' queens such that no queen can attack another queen on the chessboard.
Explanati...read more
Ans. Backtracking
1. Instead of checking all the places on the chessboard, we can use backtracking and place queen row-wise or column-wise.
2. Suppose we place queens row-wise, and we start with the very first row. Place the queen and move to the next row until either there is a solution or there are no viable cells left.
3. As we backtrack, check to place the queen in the different columns of the same row.
4. When we can place a queen at ...read more
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Q2. 
Pair Sum Problem Statement
Given an integer array ARR of size N and an integer S, your goal is to return a list of all pairs of elements such that the sum of elements of each pair equals S.
Example:
Inp...read more
Ans. Brute Force
• Initialize a list to store our results.
• For each element in the array 'ARR[i]', check if ('ARR[i]' + ‘ARR[j]’), equals to given sum or not, where ‘i’ < ‘j’ < ‘N’.
• If the condition matches, add the pair('ARR[i]', ‘ARR[j]’) to the list. Sort the list of pairs as per the given output format and return this list.
Space Complexity: O(1)Explanation:
O(1).
 
Constant extra space is required.
Time Complexity: O...read more
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Q3. 
Minimum Number of Platforms Needed Problem Statement
You are given the arrival and departure times of N trains at a railway station for a particular day. Your task is to determine the minimum number of pl...read more
Ans. Space Complexity: O(1)Explanation: Time Complexity: O(1)Explanation:
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Round duration - 120 minutes
Round difficulty - Easy

This round is an interesting experience to brainstorm, problem-solve and pair alongside a ThoughtWorks Developer that allows you to demonstrate hands-on coding, design, OOP, and solution skills on the code which you have submitted.The problem statement will be shared with you 20 minutes before the start time of the interview