OneCard Backend Developer Interview Questions and Answers

The first round is an aptitude assessment that consists of coding questions focused on dynamic programming, as well as medium to hard level aptitude and reasoning questions.

The second round focuses on coding and consists of data structure and algorithm questions related to arrays, linked lists, basic Java concepts, strings, and project-based questions from the resume.

The third round also consists of coding, which includes challenging data structures and algorithms questions based on graphs, trees, multithreading, and difficult SQL-based questions.

Q1. What are your short-term and long-term goals?
Ans. 
My short-term goal is to enhance my skills in backend development and contribute effectively to the team. My long-term goal is to become a lead developer and work on innovative projects.
• Short-term goal: Improve backend development skills

• Short-term goal: Contribute effectively to the team

• Long-term goal: Become a lead developer

• Long-term goal: Work on innovative projects
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Q2. How do you approach solving a large problem within a limited timeframe?
Ans. 
I break down the problem into smaller tasks, prioritize them, and focus on the most critical aspects first.
• Break down the problem into smaller, more manageable tasks

• Prioritize tasks based on importance and impact

• Focus on critical aspects first to ensure progress

• Regularly reassess and adjust the plan as needed
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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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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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Machine Coding round on codesignal

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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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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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