Analytics Engineer (L4) - Finance

Netflix

Given an m x n matrix, return all elements of the matrix in spiral order. Example 1: Input: matrix = [[1,2,3],[4,5,6],[7,8,9]] Output: [1,2,3,6,9,8,7,4,5] Example 2: Input: matrix = [[1,2,3,4],[5,6,7,8],[9,10,11,12]] Output: [1,2,3,4,8,12,11,10,9,5,6,7] Constraints: m == matrix.length n == matrix[i].length 1 <= m, n <= 10 -100 <= matrixi <= 100

Netflix

Let's design an A/B test to re-engage inactive users of a mobile fitness app. Assume that users are considered inactive if they haven't used the app for 30 days. Our goal is to increase the number of users who return and actively use the app. Consider the following when designing your A/B test: Control Group: This group receives no intervention. We'll use this as our baseline to measure against. Treatment Group A: Push Notification with Personalized Workout Recommendations: Users in this group receive a push notification that includes workout recommendations tailored to their past activity and fitness goals (e.g., Ready for your next challenge? Try this 30-minute HIIT workout based on your past activity!). Treatment Group B: In-App Discount on Premium Features: Users in this group receive a notification when they open the app offering a discounted rate on the app's premium features, such as personalized training plans or access to exclusive content (e.g., Welcome back! Enjoy 50% off a premium training plan this week only!). For this A/B test design, specify: The hypothesis for each treatment group. The target metric(s) you would track to measure success, and how you would measure them. The segmentation you might consider when analyzing results (e.g. by workout type, fitness level, demographics). The duration of the A/B test and the sample size needed for statistical significance. Explain your reasoning. The potential risks and how you would mitigate them.

Netflix

Describe a time when you had a deadline you couldn't meet. What did you do, and what was the outcome? For example, imagine you were tasked with developing a new feature for a popular mobile app with a launch date tied to a major industry event. Due to unforeseen technical complexities or resource constraints, it became clear that you wouldn't be able to deliver the complete feature set by the deadline. How did you communicate this to your team and stakeholders? What steps did you take to mitigate the impact of the missed deadline? Did you try to renegotiate the scope or timeline? How did you prioritize the remaining tasks, and what alternative solutions did you explore to deliver value within the limited timeframe? What did you learn from this experience, and how did it influence your approach to project management and deadline setting in subsequent projects?