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 counting and frequency coding tasks
This question evaluates algorithmic skills in counting, frequency analysis, constraint-based pair counting, and stream-oriented tokenization and ranki...
Find shortest path in an OOP maze
This question evaluates graph traversal and shortest-path reasoning within an object-oriented codebase, focusing on state representation, neighbor exp...
Write SQL for CTR and revenue
Write SQL for the following two tasks. Problem 1: CTR during peak vs. non-peak hours You are given three tables: - ads(ad_id BIGINT, advertiser_id BIG...
Implement power, reduce string, parse tree, debug maze
This multi-part question evaluates numerical algorithms (fast exponentiation), string-processing and reduction logic, recursive parsing and tree const...
Maximize Letters from Disjoint Words
This question evaluates understanding of combinatorial selection, set-based constraints, and efficient representation and enumeration of candidate sub...
Compute reply-based user metrics in 7 days
You are analyzing discussions on a social platform. Tables all_post - post_id (BIGINT, PK) - post_author_id (BIGINT, FK → user.user_id) - post_creatio...
Solve shipping capacity and expression insertion
Problem A: Minimum shipping capacity You are given an array weights where weights[i] is the weight of the i-th package. Packages must be shipped in or...
Return all root-to-leaf path sums
Problem You are given the root of a binary tree where each node contains an integer value (may be negative). Return an array/list containing the sum o...
Implement weighted random city and sparse dot product
Question 1: Weighted random city picker You are given a mapping from city → population (all populations are positive integers). Implement a random gen...
Validate near-palindrome and course prerequisite feasibility
Coding round (40 minutes): two problems You do not need to run code, but you should: - Explain your approach clearly. - Walk through the logic on exam...
Solve two linked list/array tasks
This two-part question evaluates proficiency with fundamental data structures and algorithmic problem-solving—specifically linked list manipulation an...
Validate complete binary tree
You are given the root of a binary tree. A complete binary tree is defined as a binary tree in which: 1. Every level, except possibly the last, is com...
Compute percent of active users with 50+ calls
Problem You work on a Messenger-like app. You want to measure how many active users in Great Britain (GB) today have been heavy callers recently. Tabl...
Compute active ad revenue by creation source
You work on an ads platform and need to report active ad revenue broken down by the ad’s creation source. Tables ads - ad_id BIGINT PK - advertiser_id...
Detect earliest collision among moving cars
You are given n vehicles with kinematics parameters. A “collision” means two vehicles occupy the same position at the same time. Assume continuous tim...
Compute Max Score From Up to 3 Categories
You are implementing a scoring function for a library summer reading program. Each book a student read is represented as a tuple (category: str, point...
Find longest palindromic substring
This question evaluates knowledge of string algorithms and pattern recognition, focusing on identifying palindromic substrings and reasoning about tim...
How do you expand nested placeholders in strings?
You are given a dictionary of string templates. Keys are identifiers like X, Y, Z. A template may contain placeholders of the form %KEY%, which should...
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...