Meta Data Manipulation (SQL/Python) 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...
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The interview report preserved the survey tables and the request to calculate response rate, but not the exact grouping or output contract. The follow...
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Troubleshoot a production server outage
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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...
Design Top-K, Crawler, and Chess Systems
This question evaluates system-design competency across scalable distributed services, covering real-time streaming Top-K aggregation, large-scale dis...
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 ...
Design an On-Demand Delivery Platform
Design an on-demand local delivery marketplace for restaurants or grocery stores. The platform should support customers browsing merchants, building s...
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...
Design an Online Game Leaderboard
Question Design the backend system for an online game's leaderboard. The system should support: 1. Recording and updating player scores from game sess...
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...
Compare Shop and Web Ad Performance Without Overclaiming
Compare Shop and Web Ad Performance Without Overclaiming You have 28 days of daily ad data: `text ads_detail(advertiser_id, ad_id, ad_type, ad_objecti...
Solve Parser, Trading, Tree, And Deck Tasks
You will solve several independent programming tasks. For each task, implement clean, tested code and state the time and space complexity. 1. Validate...