First Insight Senior Software Engineer Interview Questions and Answers

Pen Paper test aptitude test with 2 long answer questions

Q1. OOP Concepts- Polymorphism , what are its types
Ans. 
Polymorphism is the ability of a single function or method to operate on different types of data.
• Types of polymorphism: compile-time (method overloading) and runtime (method overriding)

• Compile-time polymorphism is achieved through function overloading, where multiple functions have the same name but different parameters

• Runtime polymorphism is achieved through function overriding, where a subclass provides a specific im...read more
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Q2. Coding question to find the first occurring letter in a string
Ans. 
Find the first occurring letter in a string
• Iterate through the string and store the count of each letter in a hashmap

• Return the first letter with count 1
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Q1. Max number of non repeating consecutive characters in a given string
Ans. 
Find the maximum number of non-repeating consecutive characters in a given string.
• Iterate through the string and keep track of the current substring of non-repeating characters

• Update the maximum length of non-repeating characters as you iterate

• Return the maximum length found
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Q1. Life cycle of thread
Ans. 
Thread life cycle includes new, runnable, running, blocked, and terminated states.
• Thread is created in 'new' state

• It becomes 'runnable' when start() method is called

• Thread enters 'running' state when CPU starts executing its run() method

• It can go to 'blocked' state if it's waiting for a resource

• Finally, thread reaches 'terminated' state when run() method completes or stop() method is called
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Q2. İnternal working of hash map
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Hash map is a data structure that stores key-value pairs and uses a hash function to map keys to their corresponding values.
• Hash map consists of an array of buckets, each containing a linked list of key-value pairs.

• When inserting a key-value pair, the hash function is used to determine the index of the bucket where the pair should be stored.

• To retrieve a value, the hash function is used to find the corresponding bucket...read more
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Q1. Salary expectations
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Q2. Why I want to change the job
Ans. 
Seeking new challenges, growth opportunities, and a better work-life balance.
• Looking for new challenges and opportunities to learn and grow

• Seeking a better work-life balance

• Interested in working with new technologies or in a different industry

• Wanting to advance career progression
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Q1. What are joins in sql
Ans. 
Joins in SQL are used to combine rows from two or more tables based on a related column between them.
• Joins are used to retrieve data from multiple tables based on a related column

• Common types of joins include INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL JOIN

• Example: SELECT * FROM table1 INNER JOIN table2 ON table1.column = table2.column
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Q2. Types of arrays in PHP
Ans. 
Types of arrays in PHP include indexed arrays, associative arrays, and multidimensional arrays.
• Indexed arrays: default type where each element is assigned a numeric index starting from 0.

• Associative arrays: elements are assigned a specific key instead of numeric index.

• Multidimensional arrays: arrays within arrays, creating a matrix-like structure.

• Example: $indexedArray = [1, 2, 3]; $associativeArray = ['key1' => 'value...read more
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Covers basics aps around 15 question

DSA based questions from leetcode easy and medium

In this round they asked 20 technical questions on java and 10 analytical question on reasoning and 3 theory questions we need to solve only 2 out of 3 total 32 questions are there in first round.

In the GD they ask about your projects

In this round i have to solve 45 question in45 minute the level of question was not hard

In the coding round i get 60 minutes in which i have to solve 3 question 2 questions were easy and third was medium

Q1. Java related questions
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Q2. Core java, Java 8
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