CoinDCX Senior Customer Service Associate Interview Questions and Answers for Experienced

Q1. Describe the Project Architecture End-to-End
Ans. 
The project architecture end-to-end includes the overall design and structure of the project from start to finish.
• The architecture should include the hardware and software components, as well as the communication protocols and data flow.

• It should also consider the scalability, security, and performance of the system.

• Examples of project architecture include client-server, microservices, and event-driven architectures.

• Th...read more
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Q2. Explain how will you implement SCD Type 2.
Ans. 
SCD Type 2 is implemented by creating a new record for each change and maintaining a history of changes.
• Identify the business key and version number for the dimension table.

• Create a new record with a new version number for each change to the dimension data.

• End-date the previous record and start-date the new record to maintain a history of changes.

• Use effective dates to determine which record is active at any given poin...read more
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Q1. Display only those elements which do not occur more than once.
Ans. 
Display non-repeated elements
• Iterate through the elements and count their occurrences

• Display only those elements with occurrence count of 1

• Use a hash table or dictionary to store the counts

• Time complexity: O(n)
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Q2. Difference between a list and a tuple. Explain a use case where you will use a tuple.
Ans. 
List vs Tuple and use case for Tuple
• List is mutable while Tuple is immutable

• List uses square brackets while Tuple uses parentheses

• Tuple is used when data needs to be protected from modification

• Tuple is also used for returning multiple values from a function
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Q1. Leetcode 125: Valid Palindrome
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Q2. Leetcode 1971: Find if path exists in graph
Ans. 
Check if a path exists between two nodes in a graph
• Use depth-first search (DFS) or breadth-first search (BFS) to traverse the graph

• Start from the source node and explore all connected nodes until the destination node is reached

• If the destination node is found during the traversal, return true; otherwise, return false
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Q1. How will you store passwords in DB
Ans. 
Store passwords securely using hashing algorithms and salt
• Use strong hashing algorithms like bcrypt or SHA-256

• Add a unique salt to each password before hashing

• Store only the hashed password in the database

• Regularly update hashing algorithms and salts for added security
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Q2. Explain "this" in JS
Ans. 
In JavaScript, 'this' refers to the current object that is executing the current function.
• The value of 'this' is determined by how a function is called.

• When a function is called as a method of an object, 'this' refers to the object itself.

• When a function is called in the global scope, 'this' refers to the global object (window in a browser, global in Node.js).

• Arrow functions do not have their own 'this' value and inste...read more
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Q1. Basic HR questions
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Q1. Project description
Ans. 
The project involves developing a new software application for data analysis.
• Developing a software application for data analysis

• Utilizing programming languages such as Python and R

• Implementing statistical models and algorithms

• Creating visualizations and reports for data interpretation
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Q2. Project, ML & Stats
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Q1. How does RNN work?
Ans. 
RNN stands for Recurrent Neural Network, a type of neural network designed to handle sequential data by maintaining a memory of previous inputs.
• RNNs have loops within their architecture, allowing information to persist.

• They are commonly used in natural language processing, speech recognition, and time series analysis.

• An example of RNN is predicting the next word in a sentence based on previous words.
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Q2. What do you mean by topic modeling?
Ans. 
Topic modeling is a technique used in natural language processing to discover the hidden thematic structure in a collection of texts.
• Topic modeling is a type of statistical modeling that allows for the discovery of hidden patterns in a collection of documents.

• It is often used in text mining to identify topics within a set of documents without the need for manual labeling.

• One popular algorithm for topic modeling is Late...read more
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Q1. Latest features in iOS
Ans. 
iOS 14 introduced new features like App Library, Widgets, Picture in Picture, and Translate app.
• App Library organizes apps automatically into categories

• Widgets can be added to the home screen for quick access to information

• Picture in Picture allows for video playback while using other apps

• Translate app offers real-time translation in multiple languages
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Q2. Concepts of basic topics
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Display list of images with unit tests

Q1. Self intro and regarding previous experience
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Basic grammar and email typing skills

Q1. Interview with the operation manager
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Q1. Ds algo problem solving round. Question was based on graph
Ans. I had to explain the logic and code
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Q2. I was asked only 1 question and i have to write code and explain the logic
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