Iris Software Senior Engineer Interview Questions and Answers

Q1. Introduction of self
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Q2. Tech stack related
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Q1. Internal working of hashmap
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HashMap is a data structure that stores key-value pairs and uses hashing to quickly retrieve values based on keys.
• HashMap internally uses an array of linked lists to store key-value pairs.

• When a key-value pair is added, the key is hashed to determine the index in the array where it will be stored.

• If multiple keys hash to the same index, a linked list is used to handle collisions.

• HashMap uses the hashCode() method of ke...read more
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Q2. What are the feature of jdk 8
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JDK 8 features include lambda expressions, functional interfaces, streams, and default methods.
• Lambda expressions allow you to write code in a more concise and readable way.

• Functional interfaces enable the use of lambda expressions.

• Streams provide a way to work with sequences of elements efficiently.

• Default methods allow interfaces to have concrete methods.

• Date and Time API improvements.
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Q1. Java, DB, Spring, UI related questions asked.
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Q2. CoreJava Multi-threading
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Q3. Database many to many relattionship related question
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Q1. Mutli-threading related questions
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Q1. Salary expectation and joining details.
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Q1. Power BI DAX calculations
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Q1. RLS Implementation
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Q1. Java coding like count of alphabet after removing spaces.
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Q2. Sql query like show highest digit in all departments
Ans. 
Retrieve the highest digit from employee IDs across all departments using SQL.
• Use the MAX() function to find the highest value in a column.

• Assuming a table structure: Employees(id INT, department VARCHAR).

• Example query: SELECT MAX(id) FROM Employees GROUP BY department;

• This will return the highest ID for each department.
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Q1. Oops concept in framework
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OOP concepts in frameworks enhance code reusability, maintainability, and scalability through encapsulation, inheritance, and polymorphism.
• Encapsulation: Bundling data and methods that operate on the data within one unit, e.g., classes in Java.

• Inheritance: Creating new classes based on existing ones to promote code reuse, e.g., a 'Dog' class inheriting from an 'Animal' class.

• Polymorphism: Allowing methods to do differe...read more
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Q2. What is framework structure
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A framework structure is a foundational design that organizes and supports software development processes.
• Modularity: Frameworks promote modular design, allowing developers to build reusable components. Example: React components.

• Abstraction: They provide a level of abstraction, simplifying complex tasks. Example: Django abstracts database interactions.

• Convention over Configuration: Frameworks often follow conventions t...read more
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Q3. Difference between selenium 3 and selenium 4
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Selenium 4 introduces significant improvements over Selenium 3, enhancing performance, features, and ease of use.
• Selenium 4 supports the W3C WebDriver standard, improving compatibility across browsers.

• Enhanced support for modern web applications with better handling of dynamic content.

• New features like the 'Relative Locators' allow finding elements based on their position relative to other elements.

• Improved documentati...read more
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