Jungleworks Full Stack Developer Interview Questions and Answers

Q1. Fibonacci, swap without 3rd var
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Q2. Non repetitive char in string
Ans. 
Find the first non-repetitive character in a string.
• Iterate through the string and count the occurrences of each character.

• Return the first character with a count of 1.
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Scenario based questions

Basic DSA linked list, stack etc

System design food delivery application

Q1. Tell me about yourself
Ans. 
I am a passionate software developer with experience in Java, Python, and web development.
• Experienced in Java, Python, and web development technologies

• Strong problem-solving skills

• Team player with excellent communication skills
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Q2. Why Appviewx and what do u know about it
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Q1. What is let, const and var?
Ans. 
let, const, and var are keywords used for variable declaration in JavaScript.
• let is block-scoped and can be reassigned.

• const is block-scoped but cannot be reassigned.

• var is function-scoped and can be reassigned.
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Basic 2 ,3 Java programs. Moderate level.

Q1. Core Java theory questions. Questions focused on multithreading. Basic spring boot questions.
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Q2. How to handle authentication in Spring Boot
Ans. 
Authentication in Spring Boot is handled using Spring Security which provides various authentication mechanisms.
• Use Spring Security to configure authentication in Spring Boot

• Define a custom UserDetailsService to load user-specific data for authentication

• Use annotations like @EnableWebSecurity and @EnableGlobalMethodSecurity to secure endpoints

• Configure authentication providers like in-memory, JDBC, LDAP, etc. in the ap
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Q3. Transient keyword
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Q1. Core Java programs. Core Java theory questions
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Q2. How many ways in Java we can handle deadlock or ways to handle synchronisation in Java.
Ans. 
In Java, deadlock can be handled by using techniques like avoiding nested locks, using timeout, and using the java.util.concurrent package.
• Avoid nested locks to prevent potential deadlocks.

• Use timeout when acquiring locks to prevent indefinite waiting.

• Utilize java.util.concurrent package classes like ReentrantLock and Semaphore for more advanced synchronization control.
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Q1. Basic salary related questions
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Q1. String palindrome
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Q2. Find all anagrams in a string
Ans. 
Find all anagrams in a string
• Create a hashmap to store the frequency of characters in the input string

• Iterate through the input string and check if the frequency of characters matches the hashmap for each substring of the same length

• Store the substrings that are anagrams in an array and return it
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Basic coding and oops concepts

Q1. Core java coding round
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