Visa Interview Questions, Process, and Tips

It was quite moderate focus on dsa

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Q1. Project related questions
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Q1. Project related questions
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Q1. Given two sorted arrays, a (m elements, size m+n) and b (n elements, size n) merge both the arrays into the first array a.
Ans. 
Merge two sorted arrays into the first array
• Start from the end of both arrays and compare elements

• Place the larger element at the end of the first array

• Continue this process until all elements are merged
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Q2. Given a monolith architecture, how would you scale it to handle 3x the traffic and also improve response time on API's during peak hours by using cache
Ans. 
To scale a monolith architecture and improve response time, use horizontal scaling and implement caching.
• Implement horizontal scaling by adding more instances of the monolith application behind a load balancer

• Use a distributed cache to store frequently accessed data and reduce database queries

• Implement caching at different levels such as application-level caching, database query caching, and HTTP response caching

• Use a ...read more
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Q3. Class design for a cache implementation, implement get(), put(), initialization methods
Ans. 
Design a cache class with get(), put(), and initialization methods.
• Define a class with a data structure to store key-value pairs.

• Implement a get() method to retrieve a value from the cache based on a given key.

• Implement a put() method to add or update a key-value pair in the cache.

• Implement an initialization method to set the initial capacity and eviction policy of the cache.

• Consider using a hash map or a linked list t...read more
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One medium and one standard DP question

Q1. Medium level question based on binary search
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Q1. Design google-pay
Ans. 
Design Google Pay - a digital wallet platform for online payments and transactions.
• Allow users to securely store payment information such as credit/debit cards, bank accounts, and loyalty cards.

• Enable users to make payments in stores, online, and within apps using their stored payment methods.

• Implement security features like biometric authentication, tokenization, and encryption to protect user data.

• Provide features fo...read more
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Q2. HLD of recursive
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High Level Design (HLD) of recursive functions in software development.
• Recursive functions call themselves to solve smaller instances of the same problem.

• HLD of recursive functions involves defining the base case, recursive case, and termination condition.

• Example: HLD of a recursive function to calculate factorial of a number involves defining base case as factorial(0) = 1.
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Q1. Puzzles available on GFG
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Q2. Behavioral question
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Codility Test with leetcode medium questions

Q1. Built a react feature
Ans. 
Built a react feature
• Identify the specific feature to be built

• Design the component hierarchy and state management

• Implement the feature using React components and hooks

• Test the feature for functionality and user experience

• Refactor and optimize the code for performance
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Q2. Questions based around react
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Q3. How to implement timer
Ans. 
A timer can be implemented using a combination of system time and a loop that checks for elapsed time.
• Get the current system time at the start of the timer

• Enter a loop that continuously checks the difference between the current system time and the start time

• When the desired time has elapsed, perform the desired action or trigger an event
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Q4. How to implement useEffect
Ans. 
useEffect is a hook in React that allows you to perform side effects in functional components.
• useEffect is used to handle side effects in React components.

• It takes two arguments: a function and an optional array of dependencies.

• The function inside useEffect is executed after the component renders.

• The optional array of dependencies determines when the effect should run.

• If the array of dependencies is empty, the effect r...read more
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Normal coding questions of stack, queues

Q1. Share feedback on interviews
Ans. 
Feedback on interviews is crucial for improvement and growth.
• Feedback should be specific and constructive

• It is important to listen actively and take notes during feedback sessions

• Implementing feedback into practice shows dedication to improvement
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Q2. Other info related to job
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