Draup Senior Software Engineer Interview Questions and Answers

Q1. Mostly on OOP's basic and some tricky questions related SOLID concepts
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Q1. Mostly asked java springboot questions
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Q2. What is interceptor
Ans. 
An interceptor is a middleware component that intercepts incoming and outgoing HTTP requests in an application.
• Interceptors can be used for logging, authentication, error handling, and modifying requests/responses.

• In Angular, interceptors can be used to add headers to HTTP requests or handle errors globally.

• In Spring framework, interceptors can be used for pre-processing and post-processing of requests.

• Interceptors are...read more
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Q3. What are all functional interfaces available in java
Ans. 
Functional interfaces in Java are interfaces with a single abstract method, used for lambda expressions and method references.
• Functional interfaces can be found in the java.util.function package.

• Examples of functional interfaces include Consumer, Supplier, Predicate, and Function.

• Functional interfaces can be identified by the @FunctionalInterface annotation.
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Q4. Gatway implementation in spring boot
Ans. 
Gateway implementation in Spring Boot allows for routing and filtering of incoming requests to different microservices.
• Use Spring Cloud Gateway for implementing gateway in Spring Boot

• Define routes and filters in application.properties or application.yml

• Example: routes: - id: my_route uri: http://localhost:8080 predicates: - Path=/my_route/**

• Example: filters: - AddRequestHeader=X-Request-Foo, Bar
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Q5. Java 8 coding questions
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Q1. Print star and some basic java
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Q1. Mostly about your previous experience
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Q1. Same nothing fancy.............
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Q1. They will judge your attitude
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Q1. Functional Interface,java 8 features,predicate functions
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Q1. General question & scenario based questions
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Pattern program and general output questions

Q1. Technical interview one-on-one
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Q1. HR round taken by hr team
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Q1. Python coding and resume based questions
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Round duration - 30 minutes
Round difficulty - Medium

This was a MCQ round. 30 ques in 30 mins consisting of difficult quantitative aptitude questions were to be solved.

Round duration - 60 minutes
Round difficulty - Medium

In this test round, 2 coding questions were given. Either write the code or pseudo code

Q1. 
N Queens Problem
Given an integer N, find all possible placements of N queens on an N x N chessboard such that no two queens threaten each other.
Explanation:
A queen can attack another queen if they ar...read more
Ans. 
The N Queens Problem involves finding all possible placements of N queens on an N x N chessboard without threatening each other.
• Use backtracking algorithm to explore all possible configurations.

• Keep track of rows, columns, and diagonals to ensure queens do not threaten each other.

• Generate all valid configurations and print them out.
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Q2. 
Sort 0 1 2 Problem Statement
Given an integer array arr of size 'N' containing only 0s, 1s, and 2s, write an algorithm to sort the array.
Input:
The first line contains an integer 'T' representing the n...read more
Ans. 
Sort an array of 0s, 1s, and 2s in linear time complexity.
• Use three pointers to keep track of 0s, 1s, and 2s while traversing the array.

• Swap elements based on the values encountered to sort the array in-place.

• Time complexity should be O(N) and space complexity should be O(1).
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Round duration - 60 minutes
Round difficulty - Easy

This was a technical round with questions on DSA.

Q1. 
Reverse Words in a String: Problem Statement
You are given a string of length N. Your task is to reverse the string word by word. The input may contain multiple spaces between words and may have leading o...read more
Ans. 
Reverse words in a string while handling leading, trailing, and multiple spaces.
• Split the input string by spaces to get individual words

• Reverse the order of the words

• Join the reversed words with a single space in between
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Q2. 
Circular Linked List Detection
You are provided with the head of a linked list containing integers. Your task is to determine if the linked list is circular.
Note:
• A linked list is considered circula...read more
Ans. 
Detect if a given linked list is circular by checking if it forms a closed loop.
• Traverse the linked list using two pointers, one moving at double the speed of the other.

• If the two pointers meet at any point, the linked list is circular.

• If the faster pointer reaches the end of the list (NULL), the linked list is not circular.
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Round duration - 30 minutes
Round difficulty - Easy

HR round with typical behavioral problems.