Grip Invest Backend Developer Interview Questions and Answers

I have to write code for a load balancer. The code should be testable and imahoild be thread safe

Q1. General HR topics, hashmap compleity
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Machine Coding round on codesignal

Q1. Consider an e-commerce site's feature that tells you by what time the parcel will reach a pincode. We discussed on architecture, whether the service that responds with the same should have the rules coupl...read more
Ans. 
The rules for parcel delivery time estimation should be decoupled from the service for better maintainability and flexibility.
• Decoupling the rules from the service allows for easier maintenance and updates without affecting the service itself.

• Separating the rules also enables reusability across different services or components.

• Using a separate rules engine or configuration file can provide flexibility to adjust the del...read more
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Q2. Classic Stock Buy and Sell once for maxium profit
Ans. 
The problem involves finding the maximum profit that can be made by buying and selling a stock once.
• Iterate through the array of stock prices and keep track of the minimum price seen so far.

• Calculate the profit that can be made by selling at the current price minus the minimum price.

• Update the maximum profit if a higher profit is found.

• Return the maximum profit at the end.
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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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A basic coding question was asked regarding a buisness logic.

Q1. Microservices architecture
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Q2. High scale system design
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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