Meta System Design 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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Design Queue And Taxi Matching Services
Answer both independent system design prompts. For each one, clarify requirements, propose APIs, describe core data models, explain the architecture, ...
Design an online auction system
Design a scalable online auction service. Users can: - Create an auction (item info, start/end time, reserve price optional). - Place bids while the a...
Handle Cross-Team Alignment and Mistakes
The behavioral round focused on three prompts: 1. How do you align requirements across teams? 2. What is the biggest mistake you have made at work? 3....
Describe leadership and inclusion examples
Prepare strong behavioral answers for the following prompts: - Tell me about a breakthrough project you led or meaningfully influenced. - Tell me abou...
Implement four coding challenges
You are asked to solve the following four independent coding problems. --- 1) Block Placement Simulator (Tetris-like) You have an empty n x m grid (ro...
How would you evaluate stolen-post detection?
You are interviewing for a Meta DSA (product analytics / data science) role. The product team is launching a new Stolen Post Detection algorithm that ...
Describe difficult project, conflict, and PM collaboration
Behavioral round (15 minutes) Answer the following prompts using concrete examples from your experience. 1. Most difficult project - Describe the m...
Solve linked list, tree, and grid problems
Problem A — Find cycle entry in a singly linked list You are given the head of a singly linked list. The list may contain a cycle. - Return the node w...
Return Binary Tree Nodes in Vertical Order
Return Binary Tree Nodes in Vertical Order A binary tree has nodes numbered from 0 through n - 1, with node 0 as the root. Arrays left and right conta...
Resolve a cd Path Against the Current Directory
Resolve a cd Path Against the Current Directory Implement path resolution for a simplified Unix-like cd command. cwd is a normalized absolute path. ar...
Design batch and streaming ETL architecture
Design batch and streaming ETL architecture System Design: End-to-End Data Platform for Product Analytics (Batch + Near-Real-Time) Context Design a sc...
Find top-K frequent elements in a stream
You receive a large stream of items (e.g., integers or strings) that may not fit in memory. Design an algorithm that can return the top K most frequen...
Describe proudest project and cross-team work
Behavioral prompts included: 1. Describe the project you are most proud of. 2. Describe a time you worked across teams to deliver a result. For each, ...
Explain a project’s impact and product thinking
A Head of Product asks: 1. Pick one analytics/data science project you led end-to-end. 2. What was the product problem and why did it matter? 3. What ...
Design a scalable MoE pretraining pipeline
Design a Large-Scale MoE Pretraining Pipeline (Bilingual LLM, 1T Tokens, 256×A100-80GB) Context You are designing a pretraining pipeline for a decoder...
Design a Real-Time Trending Hashtags System
Design the backend system that detects and serves trending hashtags from posts on a large social network (Facebook-scale). The service continuously in...
Implement BFS-based maze solver
Maze Printing and BFS Solver You are given a 2D grid representing a maze. Each cell of the grid is one of: - '#' – wall (cannot be passed) - '.' – emp...
Design a Scalable Post, Feed, and Search Service
Design a Scalable Post, Feed, and Search Service Design a social-post service with three core capabilities: a user can publish a text post, retrieve a...
Design a nearby places (proximity) service
Design a proximity search service like Yelp/Google Maps. Requirements: - Store places with (place_id, name, lat/lng, category, rating). - Query: “find...
Answer behavioral questions on projects and feedback
Prepare to answer common behavioral questions, with follow-up probing for details: - Describe a project you’re most proud of. - Describe a project whe...