SentinelOne Senior Staff Engineer Interview Questions and Answers

Q1. System Design questions
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Q2. SQL theory & pgm questions
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Q3. Python programs
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Q4. Normalization Pgms
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Q1. Concurrency related general question
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It was a 1 hour Technical screening round, coding question in java (you cna choose your own language). They asked a difficult version of regex matching question (Leetcode medium-hard).

Q1. Time Window Map
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1 hour duration. Sliding window problem. On hacker rank platform. Expected to write a working code and solve it optimally/scalable solution.

Q1. Again a coding test. LLD + hash map. 1 hour on hacker rank.
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Q1. How can we improve the performance of a Front End System
Ans. 
Improving Front End System Performance
• Optimize images and reduce their size

• Minimize HTTP requests and use caching

• Use lazy loading for images and videos

• Reduce the number of DOM elements

• Use a Content Delivery Network (CDN)

• Minimize the use of external scripts and plugins

• Use asynchronous loading for scripts

• Optimize CSS and JavaScript files

• Use browser caching

• Implement server-side rendering
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Q2. What is Event Loop and give an example on how it works.
Ans. 
Event Loop is a mechanism that allows JavaScript to handle multiple tasks simultaneously.
• Event Loop is a part of JavaScript runtime that continuously checks the call stack and the task queue.

• It prioritizes the tasks in the queue and pushes them to the call stack when it's empty.

• This allows JavaScript to handle I/O operations and other asynchronous tasks without blocking the main thread.

• Example: setTimeout() function ad...read more
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Q1. 2 question on Data structure and algorithms (easy-medium and medium level questions)
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Q2. Related to array and matrix
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Q1. This also contained discussion on last company project and some basic question regarding different tech stack used. Then asked 2 questions on Data structure and algorithms (both medium level questions)
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Q2. Related to stack and linked list
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Q1. This was the Hiring Manager round. He asked different questions related to general programming like - Rest, Http, Websockets, TCP. Asked some questions from past company projects. Then asked one easy-mediu...read more
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Q2. Programming and Math related topics
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Q1. 2 DSA leetcode (1 medium , 1 hard)
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Q1. Same round 1 2 DSA leetcode questions (1 hard , 1 medium)
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Q1. It was the hiring manager round, it started with the LRU cache algorithm and went deep in the system design
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