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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Solve tree diameter and grid path problems
You are interviewing for a software engineer / ML intern role and are given the following algorithmic problems. --- Question 1: Longest Path in a Tree...
Define hand-waving accuracy and launch decision
This question evaluates a data scientist's ability to define and operationalize detection metrics, design instrumentation and diagnostics, connect mod...
Guide a mouse to find cheese with APIs
This question evaluates the ability to reason about graph exploration and stateful API interaction in an unknown 2D grid, assessing competencies in se...
Determine if subarray sums to target
You are given an array of non-negative integers and a non-negative integer target. Determine whether there exists a contiguous subarray (continuous se...
Find K-th Largest and Longest Vacation
Solve the following two coding problems. 1. Find the k-th largest element Given an integer array nums and an integer k, return the element that wou...
Optimize repeated-value vectors and compute exclusive times
You are given two separate coding tasks from an interview. Task 1: Optimize storage for vectors with repeated values, then compute dot product You are...
How to design Shop ad ranking
This question evaluates a candidate's expertise in machine learning and data science for ad ranking systems, including objective formulation and trade...
Find shortest substring with N unique characters
You are given a string s and an integer n. Find the shortest contiguous substring of s that contains exactly n distinct characters. If there is no suc...
Design a flight search platform
This question evaluates understanding of distributed systems, API and data model design, large-scale data ingestion and indexing, search ranking and c...
Write SQL to analyze shop visibility
You are given two tables. Use standard SQL (window functions allowed). Assume "today" is 2025-09-01 and that “currently visible” means a shop’s last s...
Write SQL for video-call recipients and FR activity
Given the schema and samples below, write ANSI‑SQL to answer both questions. Assume dates are stored in UTC. Today is 2025-09-01, so “yesterday” is 20...
Estimate Portal’s causal lift on video-call usage
This question evaluates applied causal inference and statistical analysis skills, including defining estimands, designing staggered-adoption differenc...
Write SQL/pandas for KPI anomaly
Write SQL (and outline equivalent pandas) for a KPI anomaly investigation. Assume today = '2025-09-01'. Schema: Users(user_id INT, country TEXT, signu...
Diagnose a sudden KPI drop
This question evaluates operational analytics and experimentation competencies, including instrumentation and data-quality checks, de-seasonalization ...
Write SQL for daily chats and fast replies
You are given a messaging events table that records one row per message sent. Schema - messages( date DATE, -- calendar date of event (UTC) ts TIMES...
Define and query shop visibility
You are given the following schema. Use only the columns provided; do not introduce new fields or labels. Tables and columns: - shops(shop_id INT, sho...
Write SQL for hashtag source and safety rates
Write SQL for the two tasks below. Assume the schema and sample data as given, and that “today” is 2025‑09‑01. Deduplicate exact duplicates by (date, ...
Design hashtag recommender with cold start
This question evaluates expertise in recommender-system design, feature engineering, ranking and learning-to-rank models, cold-start strategies, evalu...
Write SQL filtering, grouping, CASE, UNION tasks
Use the following schema and sample data to answer all parts. Assume standard ANSI SQL and that amounts are DECIMAL. Table: orders +----------+-------...
Control error under multiple testing
This question evaluates a candidate's understanding of multiple hypothesis testing, sequential monitoring, and error-rate control—specifically familyw...