NetApp | MTS 3 | Bengaluru | 23/11/2020 [Offer]

Technical Round 1

This round began with a detailed discussion on REST API protocols. The interviewer asked me to explain why REST is considered stateless and its advantages over SOAP. We then delved into the implementation details of various protocols. Following this, I was asked to design a singleton class. I started with a naive implementation, and then the interviewer challenged me to design a thread-safe version for a multi-threaded environment. For the remaining time, we covered very basic questions on linked lists, such as finding the middle element and reversing a linked list.

Technical Round 2

This round started with a discussion about my current project and overall experience. The first coding question was Reverse Nodes in K-Group. I asked a couple of clarifying questions, then developed a solution, wrote the code, and tested it with various test cases. Afterward, I was tasked with designing a billing module for their system. The system specifications were: the application is hosted on AWS servers; users are allocated cloud storage based on their subscription, and if the limit is exceeded, extra storage should be automatically allocated, with users seeing details during billing. Logs must be generated every 15 minutes and updated into the DB, containing details of storage used by the user for the past 15 minutes. The billing module should read these logs, parse them based on user IDs, and send this data to AWS billing. I clarified a few more requirements and proposed a rough solution.

Technical Round 3

The interviewer wanted me to explain my current project in detail, including each module and its integration. I shared my screen and used Draw.io for the explanation, fielding many questions on our implementation choices and the security aspects of the application. The first coding question was to print the top view of a binary tree, which is similar to vertical order traversal on LeetCode but only requires printing the topmost nodes. Following this, I was asked to think of an algorithm to generate permutations of a string. Instead of writing code, I was given a string and asked to predict the output my algorithm would generate, which was quite an interesting twist! Later, we had a couple of basic follow-up questions on binary search trees.

Managerial Round

This final round was with the product manager. I felt that by this stage, they had already considered me for the role. The discussion focused on my experience with Agile methodology, and the manager explained how they operate within NetApp using Agile. He detailed the requirements they were looking for and mentioned they were designing a new product, though I don't clearly remember all the specific details.