CoinDCX Software Engineer Interview Questions and Answers

Oop, database, spring boot, multithreading

Q1. Implement Linked list
Ans. 
Linked list is a data structure where each node points to the next node.
• Create a Node class with data and next pointer

• Create a LinkedList class with head pointer

• Implement methods to add, remove, search, and traverse the list
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Q2. Implement Hash Map with array and linked list.
Ans. 
Implement Hash Map with array and linked list.
• Create an array of linked lists

• Hash function maps keys to array indices

• Insert key-value pairs into linked lists

• Handle collisions by chaining

• Search for a key by hashing and traversing linked list
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Q3. How to create a immutable class in java
Ans. 
To create an immutable class in Java, follow these steps:
• Make the class final

• Make all fields private and final

• Do not provide any setter methods

• Initialize all fields via constructor

• If any field is mutable, return a clone of it instead of the original object
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It has aptitude and coding based questions.For coding you can choose any coding language

There will be a GD for 7-10 people on random topic

Q1. 1st TR,ask to write a code of your preference.Linux commands,SQL
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Q1. 2nd TR ,ask about the projects you have done
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Q1. Basic HR round,where they will discuss about the company , job role etc
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Coding for python developer round.

Q1. Python django and dsa
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Q1. Normal just salary negotiation and all.
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Q1. Custom sort , and some polyfills
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Q1. Technical round with live coding.
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Q2. Java 8 questions, spring boot related questions
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Q1. Spring boot, Kafka , logging caching , design patterns questions.
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Q1. Basic short interview mostly related with work experience and compensation
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Q1. Two Strings are anagram or not
Ans. 
Check if two strings are anagrams by comparing the frequency of characters.
• Create two arrays to store the frequency of characters for each string.

• Compare the frequency arrays to check if they are anagrams.

• Example: 'listen' and 'silent' are anagrams.
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Q2. Java and Spring boot questions
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Q1. System design basic HLD
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Q2. Previous project architecture
Ans. 
Previous project architecture involved microservices with Docker containers and Kubernetes for orchestration.
• Utilized microservices architecture for scalability and flexibility

• Deployed services in Docker containers for easy portability and consistency

• Managed containerized applications with Kubernetes for automated scaling and orchestration
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Ios round
questions asked involved questions from storages used in iOS
app life cycle
multiple app login with same creds autocomplete feature

Basic problem solving round
2 medium
1 b/w medium and hard
question were asked :
tree BFS and Stair question
dynamic programming

Q1. Design app like whatsapp.
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Q1. Basic firment round with director.
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