Uber Software Engineer Interview Questions and Answers

Netflix architecture is a scalable microservices-based system with a focus on high availability and performance.

• Use microservices architecture to break down the system into smaller, independent services

• Implement a content delivery network (CDN) for efficient content distribution

• Utilize cloud services like AWS for scalability and reliability

• Implement a recommendation engine for personalized content suggestions

• Use a...read more

Find kth smallest element in unordered array with O(1) space

• Use the QuickSelect algorithm to partition the array and find the kth smallest element

• Choose a pivot element and partition the array into two subarrays

• Recursively partition the subarray that contains the kth smallest element

• Repeat until the pivot element is the kth smallest element

• Time complexity: O(n) average case, O(n^2) worst case

Given a 2D matrix with doors and walls, fill distance matrix with minimum distance to the nearest door.

• Iterate through the matrix and find the doors

• Use Breadth-First Search (BFS) to calculate the minimum distance from each cell to the nearest door

• Update the distance matrix with the minimum distances

Modify a boolean matrix such that if any element is 1, set its entire row and column to 1.

• Iterate through the matrix to find elements with value 1

• Store the row and column indices of these elements

• Update the entire row and column for each element found to be 1

Designing a system like Uber involves components like user app, driver app, server, database, and algorithms for matching and routing.

• User app for booking rides and tracking

• Driver app for accepting rides and navigation

• Server for handling requests and communication between apps

• Database for storing user, driver, and ride information

• Algorithms for matching riders with drivers and routing

The task is to determine the minimum time required for all fresh oranges to become rotten in a grid.

• Create a queue to store the rotten oranges and their time of rotting.

• Iterate through the grid to find the initial rotten oranges and add them to the queue.

• Perform BFS by popping each rotten orange from the queue, rot adjacent fresh oranges, and add them to the queue with updated time.

• Continue until the queue is empt...read more