Meta System Design 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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Solve a Key-Door Corridor Maze
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Compute ad impression conversion rates
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Solve Array Merge and Parentheses Cleanup
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Solve Array, Matrix, and Recommendation Problems
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Find a String Containing Another
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Solve Subarray Sum and Local Minimum
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Solve coding and AI-assisted tasks
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Infer an Unknown Alphabet Order
You are given a list of words that is already sorted according to an unknown alphabet. Derive one valid ordering of the characters in that alphabet. R...
Implement an Expiring Record Store
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Implement array parity and tree level views
This question evaluates proficiency in array frequency analysis and binary tree traversal, testing skills in data structures, correctness reasoning, a...
Count heavy callers in 7 days
This question evaluates proficiency in SQL-based data manipulation and analytics, covering joins between user and call records, aggregation and distin...
Solve Four Online Assessment Problems
Complete the following four independent coding tasks. For each task, write a function that returns the requested result. 1. Find the best value index ...