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Implement thread safe load balancer.
focus on input validations and cover all corner cases in tests
I applied via LinkedIn and was interviewed in Apr 2024. There was 1 interview round.
Concurrency is the ability of a system to execute multiple tasks simultaneously.
Concurrency allows multiple tasks to run concurrently, improving performance and efficiency.
Concurrency can be achieved through multithreading or multiprocessing.
Example: A web server handling multiple requests simultaneously using multithreading.
ACID principles are a set of properties that guarantee database transactions are processed reliably.
Atomicity: Transactions are all or nothing. If one part of the transaction fails, the entire transaction is rolled back.
Consistency: Transactions bring the database from one valid state to another. All constraints are satisfied.
Isolation: Transactions are isolated from each other until they are completed.
Durability: Once...
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I applied via Referral and was interviewed in Jul 2024. There were 2 interview rounds.
It was about DS Algo and Java garbage collection,multithreading
Rate limiter is a system that controls the rate of traffic sent or received by a network interface.
Implement a token bucket algorithm to track and limit the rate of requests
Use a sliding window algorithm to track the number of requests within a specific time frame
Consider using a distributed rate limiter for scalability and fault tolerance
Calculate the number of subsets of a given set
The number of subsets of a set with n elements is 2^n
Include the empty set and the set itself in the count
For example, a set with 3 elements will have 2^3 = 8 subsets
Remove the kth node from the end of a linked list.
Use two pointers, one to traverse the list and another to keep track of the kth node from the end.
Once the first pointer reaches the end, the second pointer will be at the kth node from the end.
Adjust the pointers to remove the kth node.
Whatsapp low level design involves messaging, encryption, media sharing, and user authentication.
Use end-to-end encryption to secure messages
Implement message queues for real-time message delivery
Allow media sharing through file transfer protocols
Use OAuth for user authentication and authorization
I applied via Recruitment Consulltant and was interviewed in Apr 2024. There were 3 interview rounds.
Find the length of the longest consecutive elements sequence in an array.
Sort the array to ensure consecutive elements are adjacent
Iterate through the array and keep track of the current consecutive sequence length
Update the longest consecutive sequence length as you iterate
Executor Service is a framework provided by Java for managing and executing asynchronous tasks.
Executor Service allows you to easily create and manage threads for executing tasks.
It provides a way to control the number of threads used for executing tasks, which can help prevent resource exhaustion.
You can submit tasks to an Executor Service using methods like execute() or submit().
Executor Service can be used to execut...
I was interviewed before Mar 2023.
Was a tough oneto crack
I applied via Referral and was interviewed in Jun 2024. There was 1 interview round.
Asked to do coding for RDBMS using any programing language
Design an ad-click aggregation service for tracking and analyzing ad clicks.
Use a distributed system to handle high volume of ad click data
Implement real-time processing for immediate insights on ad performance
Utilize a database to store aggregated ad click data for reporting and analysis
Design a high-performance in-memory cache system for storing and retrieving data efficiently.
Use a hash table or a key-value store to store data in memory
Implement caching strategies like LRU (Least Recently Used) or LFU (Least Frequently Used) to manage cache eviction
Consider using a distributed cache for scalability and fault tolerance
Optimize cache size and expiration policies based on the application's data access
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