Senior Technical Staff Member 1 Interview Questions and Answers

Design a scalable system for managing user profiles with efficient data retrieval and storage.

• Use a microservices architecture to separate user profile management from other services.

• Implement a NoSQL database like MongoDB for flexible schema and scalability.

• Utilize caching mechanisms like Redis to speed up frequent data retrieval.

• Incorporate RESTful APIs for easy integration with front-end applications.

• Consider using GraphQL for more efficient data querying.

Handle dynamic web elements by using techniques like waiting, locating by attributes, and using explicit waits.

• Use implicit waits to wait for elements to load before interacting with them

• Locate elements by attributes like ID, class name, xpath, etc.

• Use explicit waits to wait for specific conditions before proceeding

• Handle dynamic elements by using dynamic locators or regular expressions

• Use frameworks like Selenium for handling dynamic web elements

HashMap is a data structure that stores key-value pairs and uses hashing to efficiently retrieve values based on keys.

• HashMap internally uses an array of linked lists to store key-value pairs.

• When a key-value pair is added, the key is hashed to determine the index in the array where it will be stored.

• If multiple keys hash to the same index, a linked list is used to handle collisions.

• To retrieve a value, the key is hashed again to find the corresponding index and then the link...read more

A top view of a binary tree shows the nodes visible when looking at the tree from the top.

• The top view of a binary tree is the set of nodes visible when looking at the tree from the top.

• Nodes at the same horizontal distance from the root are considered at the same level.

• Use a map to store the horizontal distance of each node and only keep the first node encountered at each horizontal distance.

Height of a binary tree is the maximum number of edges on the longest path from the root node to a leaf node.

• Height of an empty tree is -1

• Height of a tree with only one node is 0

• Height of a binary tree can be calculated recursively by finding the height of left and right subtrees and adding 1 to the maximum of the two heights