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Principal Engineer Interview Questions
4,346 principal engineer interview questions shared by candidates
It was a long time ago but I do remember a few questions! Q. How do you write a singleton class in Java and how do you make it thread-safe
At 1st interview they asked questions on: Android core and advance features. OPP related questions. Android service life cycle related question At 2nd interview it was mainly on project management related questions
Design and Algorithmn mostly java related tech stack.
Quite simple and straight forward, based on prior experience.
What did you do at your previous job?
Given a binary tree, determine if it is a BST
# Write an algorithm to determine if a number n is happy. # A happy number is a number defined by the following process: # Starting with any positive integer, replace the number by the sum of the squares of its digits. # Repeat the process until the number equals 1 (where it will stay), or it loops endlessly in a cycle which does not include 1. # Those numbers for which this process ends in 1 are happy. # Return true if n is a happy number, and false if not. # Example 1: # Input: n = 19 # Output: true # Explanation: # 1^2 + 9^2 = 82 # 8^2 + 2^2 = 68 # 6^2 + 8^2 = 100 # 1^2 + 0^2 + 0^2 = 1 # Example 2: # Input: n = 2 # Output: false
Asked about building a process around data retrieval.
Asked to design a system that they are currently working on.
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