Amazon | Applied Scientist I | United Kingdom

Hi,

I had my virtual onsite with Amazon for an Applied Scientist I position in the United Kingdom.

• Machine learning questions: bias-variance tradeoff, what is overfitting and how to prevent it, derive the equation of linear regression and logistic regression with MAP
• A medium Leetcode question: https://leetcode.com/problems/max-consecutive-ones-ii/description/

Got the outcome in the afternoon.

• Science breadth: how to perform A/B testing, what is a t-test, how does k-means work, how do you choose the number of clusters and write a sketch of the algorithm, what is a transformer and why does it work well on text data, how do you deal with imbalanced data, what happens if double the size of your dataset
• Science depth: I do not remember the exact question, but it was related to a prediction system of an item in Amazon marketplace
• Coding: two Leetcode questions https://leetcode.com/problems/next-greater-element-i/description/ and a variation of https://leetcode.com/problems/single-element-in-a-sorted-array/description
• Behavioral: LP questions

I scheduled the full loop 2 weeks after the phone screen.

Outcome: offer