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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Find longest palindromic substring
This question evaluates knowledge of string algorithms and pattern recognition, focusing on identifying palindromic substrings and reasoning about tim...
Design an online chess game with undo and leaderboard
This question evaluates proficiency in real-time system design, state management, and concurrency control for multiplayer games, including consistency...
Design a time-versioned key-value store and find common free time
You are given two coding tasks. Task 1: Time-versioned key-value store Design an in-memory data structure that supports: - set(key, value, timestamp):...
Implement several string, tree, and BFS problems
This multi-part problem evaluates proficiency with core data structures and algorithms: binary tree traversal with column-aligned output, string parsi...
Design an Instagram-like auction platform
This question evaluates expertise in large-scale system design, including distributed systems, data modeling, real-time messaging, consistency models,...
Find shortest subarray with range ≥ k
Problem You are given an integer array nums of length n and an integer k. Define the range of a subarray as: \[ \max(\text{subarray}) - \min(\text{sub...
Design an ad click tracking system
This question evaluates a candidate's ability to architect a high-throughput, reliable ad event tracking system, including event modeling, streaming a...
How to evaluate emoji reactions?
This question evaluates product analytics and experimentation competencies for a Product Analyst role in the Analytics & Experimentation domain, focus...
Write SQL to compare social-only vs game-only engagement
You are given two tables capturing Oculus app usage. Define an 'active day' as a UTC date on which a user generates at least one event. Consider only ...
Handle novelty and residual effects
This question evaluates a data scientist's competency in experiment design and causal inference for online metrics under temporal dynamics, specifical...
Compute CTR overall and by campaign type
Write SQL to compute: (Q1) overall click-through rate (CTR = clicks/impressions) in the last week; (Q2) CTR by campaign_type in the last week. Assume ...
Write SQL for retention, conversion, and churn
Assume today is 2025-09-01 (use the user's local day boundaries based on users.tz). Given the following schema and sample data, write SQL to: (a) Comp...
Design and analyze end-to-end A/B test
This question evaluates experimentation design and analysis competencies for A/B testing, including metric selection, statistical interpretation, inte...
Define success metrics beyond time spent
This question evaluates a data scientist's competency in product analytics and experimentation, focusing on metrics design, cohort-based retention mea...
Compute binary-tree diameter via return-only DFS
Given the root of a binary tree, compute its diameter defined as the number of edges on the longest path between any two nodes. Implement a DFS that r...
Write SQL to analyze Group Calls adoption
Write SQL (assume PostgreSQL) to analyze Group Calls adoption and cannibalization. Use this schema and sample data. Schema: - users(user_id INT PRIMAR...
Design experiments and observational alternatives
This question evaluates causal inference, experimental design, metric definition and measurement, power analysis, segmentation, and observational stud...
Design an A/B test for comments UI
This question evaluates experimental design, causal inference, statistical power calculation, variance-reduction techniques, sequential monitoring, an...
Estimate first selection round with/without replacement
This question evaluates understanding of probability and expectation concepts, specifically sampling with and without replacement, per-round success p...
Diagnose sales correlations without claiming causality
This question evaluates a data scientist's competency in designing correlation-focused observational analyses, including exposure-window definition, c...