OneCard Backend Developer Interview Questions and Answers

Q1. Microservices architecture
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Q2. High scale system design
Ans. 
Designing high scale systems involves careful planning for scalability, reliability, and performance.
• Identify the key components of the system and their interactions

• Use distributed systems and microservices architecture for scalability

• Implement caching mechanisms to improve performance

• Utilize load balancing and horizontal scaling to handle increased traffic

• Monitor system performance and implement auto-scaling mechanism
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Optimise SQL queries to transmit large datasets and check for resiliency

Q1. Write a program to read a file
Ans. 
Program to read a file in backend development
• Use a programming language like Python, Java, or C++ to open and read the file

• Use file handling functions to read the contents of the file

• Handle exceptions for file not found or permission issues

• Close the file after reading to free up system resources
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Q1. Java threads concepts and its usage
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Q2. Data structures problems and design quentions
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Machine Coding round on codesignal

It was a machine coding round which revolves around designing a simple application primarily on OOPS

Q1. Best time to sell stocks
Ans. 
The best time to sell stocks is when the market is high and the stock has reached its peak value.
• Sell when the stock has reached its peak value to maximize profits

• Consider selling if the company's fundamentals have changed negatively

• Sell if you need to rebalance your portfolio or have reached your financial goals
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Q2. Best time to sell stocks 2
Ans. 
The best time to sell stocks is when the market is at a peak and the stock price is high.
• Monitor market trends and stock performance regularly.

• Consider selling when the stock reaches a new high or when you have achieved your profit goals.

• Sell if there are negative news or events that could impact the stock price negatively.
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Q1. Basic questions about projects
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Q2. Design a get api .
Ans. 
Design a GET API to retrieve user information.
• Define the endpoint for the API (e.g. /users/:id)

• Include query parameters for filtering (e.g. /users?role=admin)

• Return user data in JSON format

• Handle errors gracefully (e.g. return 404 if user not found)
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Q1. Similar to first round based on project i have worked on my previous company.
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Q2. Write a post APi
Ans. 
To create a post API for a backend system
• Define the endpoint for the API (e.g. /posts)

• Set up the HTTP method (e.g. POST)

• Handle the request data and process it accordingly

• Implement the necessary validation and error handling

• Return a response with the appropriate status code and data
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