Meta Interview Questions
Practice 1,159 real Meta interview questions for 2026. Covers top categories — Coding & Algorithms, Analytics & Experimentation, Data Manipulation (SQL/Python), Behavioral & Leadership, and System Design — across Software Engineer, Data Scientist, Machine Learning Engineer, Data Engineer, and Product Manager roles. Real questions from actual interviews with detailed solutions. Expect a software-engineering-heavy loop: timed algorithmic coding (trees, arrays, graph/maze problems, delimiter/CSV parsing), system-design prompts like leaderboards, flight search and online-judge architectures, and an increasingly common AI-assisted coding round that mirrors real workflows. Data Scientist rounds emphasize product analytics and experimentation—designing tests, diagnosing spend drops and bots, evaluating unconnected content, and writing SQL for multi-account, seller, and vehicle metrics. Machine Learning Engineer questions skew toward recommender and ranking work (place and friend recommendation, sparse-matrix ops, linear-regression derivations, newsfeed dislike models). Data Engineers focus on data modeling, ETL, capacity calculations, reservations/utilization queries, and production SQL/Python tasks. For interview preparation, prioritize timed coding practice, system-design templates, rigorous SQL drills (joins/CTEs/aggregation), clear A/B-testing frameworks, and concise STAR behavioral stories tied to measurable impact.
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Design cluster-randomized test under network effects
A/B Test Design for a New Group Call Feature with Network Effects You are designing an experiment for a Group Call feature where social network effect...
Compute fraud probabilities with Bayes and Binomial
Fake-Account Detection with Binomial Sessions and Bayes Updating You are evaluating a rules-based detector for fake accounts on an online platform. Ea...
Design a feed ads A/B test with guardrails
Experiment Design: Insert One Extra Ad Every 8 Organic Posts in Main Feed Context You want to increase ad load by inserting one additional ad for ever...
Design a YouTube/Netflix video platform
Design a video platform similar to YouTube/Netflix. Requirements: - Upload videos (for YouTube-like) and/or ingest catalog (for Netflix-like). - Trans...
Design a chat messaging system
Design a chat system similar to WhatsApp/Messenger. Requirements: - 1:1 and group chats. - Send/receive messages in real time when online; store-and-f...
Design a price drop tracking service
Design a price tracking service like CamelCamelCamel. Requirements: - Users track products and receive alerts when price drops below a threshold. - Pe...
Compute probability an account is fake
This question evaluates understanding of conditional probability and Bayesian reasoning, specifically interpreting base rates alongside true positive ...
Handle conflict and urgent shifting priorities
Answer the following behavioral questions with concrete examples from your experience: 1. Describe a conflict you had with a partner or teammate. What...
Evaluating a 15 % reduction in post‑card height
Evaluating a 15 Percent Reduction in Post-card Height You own the feed UX for a social app. Designers propose shrinking each post card's height by 15 ...
Demonstrate leadership and ensure data compliance
Behavioral & Leadership: Leading Through Reorg While Shipping ML + Ensuring Data Compliance Context You are the ML lead during a reorganization that r...
Design a real-time messenger
Question Design a real-time messaging system (a Messenger/WhatsApp-style product) that supports 1:1 and group chats. Walk through requirements, the AP...
Design an online coding platform
Design an online coding practice and interview platform (similar to well-known coding challenge sites). The platform should allow: - Users to sign up,...
Design Machine Learning Model for Facebook Groups Post Ranking
Design Machine Learning Model for Facebook Groups Post Ranking ML System Design: Ranking Facebook Groups Posts in News Feed Scenario You are designing...
Implement Multi-Level In-Memory Services
Implement the following independent multi-level in-memory service simulations. In an interview, you may receive one scenario and unlock the levels seq...
Detect fake accounts and measure their impact
This question evaluates competency in fraud detection, causal impact measurement, experimentation design, and operational analytics for product and ad...
Evaluate a new-listing notification feature
This question evaluates product analytics, causal inference, experimentation design, metric definition, and business-impact estimation competencies fo...
Implement fast power and k-palindrome
This question evaluates numerical algorithm design and string algorithm skills, focusing on efficient exponentiation with negative exponents and deter...
Evaluate new-product notification feature
A marketplace team is considering building a feature that notifies buyers when new products relevant to their interests are listed. How would you dete...
Design an experiment to evaluate a new ads algorithm
You are a Product Analytics/Data Science partner for an ads ranking/recommendation team. Facebook has shipped (or plans to ship) a new ad recommendati...
Design concurrent expiring job registry
This question evaluates understanding of concurrent data structures, synchronization primitives, time-based expiration semantics, and efficient cleanu...