Netflix Interview Questions
Practice the exact questions companies are asking right now.
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Design an ad frequency capping system
Design a real-time ad frequency capping system for an ads platform. When the ad server is deciding whether to show an ad, it must enforce caps such as...
Design an ads audience targeting system
Problem Design an ads audience targeting system that allows advertisers to upload large user lists and then target (or exclude) those users when servi...
Solve sliding-window and disjoint-string-pairs tasks
Task A (Sliding Window) Given a string s, find the length of the longest contiguous substring that contains no repeated characters. - Input: a string ...
Compute subtree sums with tree DFS
You are given an undirected tree with n nodes labeled 1..n and n-1 edges. The tree is rooted at node 1. Each node i has an integer value val[i]. Retur...
Estimate ATE of personalization on streaming
You are given a user-level dataset from an online experiment that randomized personalization (treatment) vs no personalization (control). Assume one r...
Design homepage viewport rendering with deduplication
Design the backend + client interaction to support viewport rendering for a streaming service’s home page (rows of videos/tiles). Scenario - The home ...
Design a concurrent latency percentile tracker
Design a thread-safe LatencyTracker class that supports: 1. Recording samples - Input: timestamp (e.g., epoch millis) and latencyMs (integer millis...
Answer core probability and statistics questions
Answer the following interview-style probability/statistics questions. Provide formulas and short explanations. 1) Bayes’ rule: State Bayes’ rule. Giv...
Design an ad frequency capping system
Design a frequency capping system for an ads platform. An ad server must decide, for each ad impression opportunity, whether showing an ad would viola...
Design demand-side ads relational tables
You are designing the core relational data model for a demand-side advertising system. Create a normalized schema (tables + key columns + relationship...
Compute minimum semesters to finish courses
You are given n courses labeled 1..n and a list of prerequisite relations prereq, where each element is a pair [a, b] meaning you must complete course...
Model data for an ads platform
Problem Design a data model for an online advertising system that supports creating ads and analyzing delivery/performance. Core product needs The sys...
Compute ITT, TOT, and LATE with noncompliance
In the same personalization experiment, not everyone assigned to treatment actually receives personalization (noncompliance). You are given user-level...
Model ads demand data for reporting
You are asked to design the data model (and supporting pipelines at a high level) to represent ads demand for an ads platform. “Demand” here refers to...
Design playlist with add/remove/shuffle
Music Playlist Data Structure Design an in-memory Playlist data structure that supports the following operations on a set of songs: - add(songId): Add...
How do you give and receive feedback?
Behavioral questions about feedback: 1) Tell me about a time you had to give constructive feedback to a teammate or cross-functional partner (e.g., PM...
Return the longest contiguous subarray with all distinct values
Given an array shows of integers, return the longest contiguous subarray in which all values are distinct (no repeats within the subarray). Function s...
Dedupe titles in per-shelf viewport
You are rendering a streaming app home page. - The home page consists of shelves displayed from top to bottom. - Each shelf contains a list of titleId...
Design a crash-resilient file system
Prompt Design a resilient file system that can recover file contents correctly after a system crash (e.g., power loss / kernel panic). The interviewer...
Solve core probability and statistics questions
Answer the following short theory/computation questions (as in an OA multiple-choice section). Provide the key formula and a brief explanation. 1. Bay...