Pindexx Interview Experience For Backend Developer
Application Shortlisting:
The very first step was application submission and shortlisting. I applied through its official careers page and received the update within a month.
Online Coding Test
I was invited for an online coding test which was medium in difficulty. Some questions were simply straightforward but some were time-consuming. Some were subjective types that assessed the analysis skill of an individual.
Sample Questions:
- Implement a function to check if a given binary tree is a valid binary search tree.
- Write a program to implement a simple REST API using any backend framework (e.g., Flask, Express).
- Solve a problem involving string manipulation, such as finding the longest substring without repeating characters.
- Design an algorithm to find the shortest path in a weighted graph using Dijkstra's algorithm.
Technical Interview (First Round - Medium Difficulty)
After clearing the coding assessment, I received the call to schedule my first technical round. This was more of DSA based including some hands-on coding exercises as well. The interviewer was interested in my previous projects as well and asked some challenges over the same.
Sample Questions:
- Explain the difference between a stack and a queue, and provide examples of their use cases.
- Solve a problem involving binary tree traversal (in-order, pre-order, post-order).
- Implement a function to detect a cycle in a directed graph using Depth-First Search (DFS).
- Discuss your experience with dynamic programming and solve a related problem, such as the longest common subsequence.
Technical Interview (Second Round - Medium Difficulty)
This was the final round of assessing the backend experience. The questions vary across domains and judged individual's skills on backend technologies like Java and Spring.
Sample Questions:
- Describe the architecture of a typical web application and the role of the backend in it.
- How do you handle database transactions and ensure data consistency in a multi-threaded environment?
- Write a function to paginate results from a database query and discuss optimization techniques.
- Explain how you would design and implement a caching mechanism to improve the performance of a web application.
