Shiprocket Private Limited Associate Software Engineer Interview Questions and Answers

I am a passionate software developer with a strong background in programming languages such as Java, Python, and JavaScript.

• Experienced in developing web applications using frameworks like Spring Boot and React

• Proficient in database management with SQL and NoSQL databases

• Skilled in problem-solving and debugging code efficiently

Find the longest palindromic substring in a given string.

• Use dynamic programming to solve the problem efficiently.

• Start with the base cases of single characters and two characters.

• For longer substrings, check if the first and last characters match and if the substring between them is also a palindrome.

• Keep track of the longest palindrome seen so far.

• Time complexity: O(n^2), space complexity: O(n^2).

Developing a real-time data processing system for a high-traffic website.

• Designing a scalable architecture to handle the high volume of incoming data.

• Optimizing the data processing algorithms to minimize latency.

• Ensuring data consistency and accuracy in a distributed system.

• Implementing fault-tolerant mechanisms to handle system failures.

• Testing and debugging the system under various load conditions.

Dynamic Programming problem involving finding the maximum sum of non-adjacent elements in an array.

• Use dynamic programming to keep track of the maximum sum at each index.

• At each index, the maximum sum is either the current element plus the sum two indices back, or the sum at the previous index.

• Example: For array [2, 4, 6, 2, 5], the maximum sum of non-adjacent elements is 13 (2 + 6 + 5).

Find the longest common prefix among an array of strings.

• Iterate through the characters of the first string and compare with other strings

• Return the prefix when characters don't match or reach end of any string

• Example: Input - ['flower', 'flow', 'flight'], Output - 'fl'

LRU cache is a data structure that stores the most recently used items.

• Use a doubly linked list to keep track of the order of items based on their usage.

• Use a hashmap to quickly access items in the cache.

• When a new item is accessed, move it to the front of the linked list.

• If the cache is full, remove the least recently used item from the end of the linked list.

Promise in Node.js is an object representing the eventual completion or failure of an asynchronous operation.

• Used to handle asynchronous operations in a more readable and manageable way

• Can be in one of three states: pending, fulfilled, or rejected

• Can be chained together to handle multiple asynchronous operations sequentially

• Example: fetching data from a database using a promise-based API