Meta Behavioral & Leadership 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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Self-Attention: Implementation, Complexity, and Efficient Variants
This question evaluates a machine learning candidate's understanding of the self-attention mechanism, including its implementation, computational comp...
Design a Concurrent, Memory-Bounded Tally Service
Design a Concurrent, Memory-Bounded Tally Service Design and implement the core of a TallyService with two operations: - bump(timestamp): record one e...
Make a String Palindromic with at Most K Deletions
Implement can_make_palindrome(text, k). Return whether deleting at most k characters from text can leave a palindrome. Characters that remain must pre...
Evaluate a Live-Stream Group Notification Under Network Effects
Prompt A social travel app wants to add a notification: “Someone in one of your groups is live now.” The notification can increase attendance at live ...
Find a Local Minimum with Left-Biased Binary Search
Implement left_biased_local_min(values) for a nonempty integer array. An index is a local minimum when its value is no greater than each neighbor that...
Design Boolean Search over User Status Posts
Design a search service for short plain-text status posts. It must ingest new statuses and answer Boolean queries containing terms joined by AND and O...
Sum Numbers Formed by Root-to-Leaf Paths
Implement sum_root_to_leaf_numbers(values) for a binary tree serialized as a zero-based heap array. For an existing node at index i, its children are ...
Count Subarrays with a Target Sum
Implement count_target_subarrays(values, target). Return the number of contiguous subarrays whose elements sum exactly to target. Values may be negati...
Machine Learning Fundamentals: Optimizers, Scaling Laws, and Clustering
This question evaluates conceptual grasp of core machine learning fundamentals: gradient-based optimizers, neural scaling laws, and unsupervised clust...
Answer Exact Island-Size Existence Queries
Implement island_size_queries(grid, queries) for a rectangular binary grid. Cells containing 1 are land, cells containing 0 are water, and land cells ...
Return a Shortest Path Through a Binary Grid
Implement shortest_grid_path(grid) for a square binary matrix. A cell containing 0 is open and a cell containing 1 is blocked. Start at the top-left c...
Design an LLM-Based Coding Assistant
This question evaluates a candidate's ability to design an end-to-end machine learning system, covering model architecture, training data pipelines, e...
Define Success for a New Group Feature Without Hiding Cannibalization
Prompt A travel-oriented social app is considering a new Groups feature that lets people who do not already know one another form communities around d...
Design an LLM-Based Conversational Assistant (Chatbot)
This question evaluates the ability to design an end-to-end LLM-based conversational assistant, covering pretraining, alignment, retrieval, and servin...
Describe Using AI at Work
This question evaluates AI literacy, communication of technical impact, ethical judgment about safeguards, and the ability to quantify business or eng...
Find A Low-Quality Annotator From Label Data
Practice a pandas-style data analysis prompt for identifying a low-quality annotator from label data. The question emphasizes cleaning, agreement or g...
Implement 1NN Embeddings and Forward Pass
This question evaluates proficiency in vectorized linear algebra and neural-network forward-pass implementation within the Machine Learning domain, co...
Design an Instagram-Style Social Feed
A Meta software-engineer onsite system-design question: design an Instagram-style social feed (photo/video sharing with a personalized home feed). It ...
Compare Survey Satisfaction for New and Established Users
The interview report preserved the survey tables and the request to compare response levels for new and old users, but it explicitly noted that the in...
Evaluate a New Ads-Ranking Algorithm
Evaluate a New Ads-Ranking Algorithm An ads team has developed a new ranking algorithm that chooses which ad to show for each eligible opportunity. En...