I applied through an employee referral. The process took 3 weeks.

Interview was spread out over 4 rounds:

• Phone screen with recruiter. Super nice guy, just asking some basic questions about my background and my interest in the company.
• 1 hour technical interview with a senior engineer, more questions about my background and some quizzing on React fundamentals.
• 2 hour "take home" coding interview. Decent challenge but nothing like Leetcode.
• Final round is 3 hour-long interviews with different engineering & product people in the company, miscellaneous interviews around product and engineering principles, and some more questions about background.

What is the function and purpose of the Virtual DOM in React?