GAIA SMART CITIES SOLUTIONS Senior Software Developer Interview Questions and Answers

Q1. 2 sum in array
Ans. 
The Two Sum problem involves finding two numbers in an array that add up to a given target value.
• Iterate through the array and store the difference between the target and current element in a hashmap

• Check if the current element exists in the hashmap, if yes return the indices

• Time complexity can be reduced to O(n) using a hashmap
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Q2. Reverse a linked list
Ans. 
Reverse a singly linked list and return the reversed list.
• Iterate through the linked list and reverse the pointers to point to the previous node instead of the next node.

• Use three pointers to keep track of the current, previous, and next nodes while reversing the list.

• Update the head of the list to be the last node after reversing.
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Q3. In given time slots , find conflicting time slots
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Q1. Asked about projects
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Q2. Longest palindrome
Ans. 
Find the longest palindromic substring in a given string.
• Iterate through each character in the string and expand around it to find palindromes

• Use dynamic programming to optimize the solution

• Consider both odd and even length palindromes
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Had 50 qsns in 45 min

Had 5 qsns to execute topics like tress and graphs

Q1. Sql queries and how to extract the data
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Q2. Oops concepts and their execution
Ans. 
Oops concepts are fundamental principles of object-oriented programming that help in organizing and designing code efficiently.
• Encapsulation: Bundling data and methods that operate on the data into a single unit (class).

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

• Polymorphism: Ability of objects to take on multiple forms or have multiple behaviors.

• Abstraction: Hiding the complex ...read more
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Q1. Introduction .....
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Q1. Spark architecture.
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Q2. Narrow and wide transformations
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Q1. Strecture of sql statement
Ans. 
SQL statements are used to interact with databases by performing operations like querying, updating, and deleting data.
• SQL statements are made up of keywords like SELECT, INSERT, UPDATE, DELETE, etc.

• They are structured in a specific order, with clauses like WHERE, ORDER BY, GROUP BY, etc.

• Tables are referenced using their names, and conditions are specified to filter data.

• Joins can be used to combine data from multiple
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Good level question. I have qualified for the next round

Basic to intermediate question, Cleared the test

Q1. Tell me about yourself and introduce yourself
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Q1. What programming language are you most proficient?
Ans. 
I am most proficient in Java.
• Extensive experience in developing applications using Java

• Strong understanding of object-oriented programming principles

• Familiarity with popular Java frameworks like Spring and Hibernate
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Q2. .NET, Angular and Sql Server
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Q1. How would you design a system that needs to handle million of records
Ans. 
I would design a system using scalable architecture, efficient data storage, and optimized query processing.
• Utilize a distributed database system like Cassandra or Hadoop for storing large volumes of data

• Implement data partitioning and sharding to distribute the data across multiple servers

• Use indexing and caching mechanisms to optimize query performance

• Employ load balancing techniques to evenly distribute incoming req...read more
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