Meta System Design Interview Questions
Practice 1,129 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.
"I got asked a hardcore MCM DP question and I saw it on PracHub as well. Solved that question in 5 minutes. Without PracHub I doubt I could solve it in 5 hours. Though somehow didn't get hired, perhaps I guess I solved it too fast? /s"
"Believe me i'm a student here jn US. Recently interviewed for MSFT. They asked me exact question from PracHub. I saw it the night before and ignored it cause why waste time on random sites. I legit wanna go back and redo this whole thing if I had chance. Not saying will work for everyone but there is certainly some merit to that website. And i'm gonna use it in future prep from now on like lc tagged"
"10 years of experience but never worked at a top company. PracHub's senior-level questions helped me break into FAANG at 35. Age is just a number."
"I was skeptical about the 'real questions' claim, so I put it to the test. I searched for the exact question I got grilled on at my last Meta onsite... and it was right there. Word for word."
"Got a Google recruiter call on Monday, interview on Friday. Crammed PracHub for 4 days. Passed every round. This platform is a miracle worker."
"I've used LC, Glassdoor, and random Discords. Nothing comes close to the accuracy here. The questions are actually current — that's what got me. Felt like I had a cheat sheet during the interview."
"The solution quality is insane. It covers approach, edge cases, time complexity, follow-ups. Nothing else comes close."
"Legit the only resource you need. TC went from 180k -> 350k. Just memorize the top 50 for your target company and you're golden."
"PracHub Premium for one month cost me the price of two coffees a week. It landed me a $280K+ starting offer."
"Literally just signed a $600k offer. I only had 2 weeks to prep, so I focused entirely on the company-tagged lists here. If you're targeting L5+, don't overthink it."
"Coaches and bootcamp prep courses cost around $200-300 but PracHub Premium is actually less than a Netflix subscription. And it landed me a $178K offer."
"I honestly don't know how you guys gather so many real interview questions. It's almost scary. I walked into my Amazon loop and recognized 3 out of 4 problems from your database."
"Discovered PracHub 10 days before my interview. By day 5, I stopped being nervous. By interview day, I was actually excited to show what I knew."
"I recently cleared Uber interviews (strong hire in the design round) and all the questions were present in prachub."
"The search is what sold me. I typed in a really niche DP problem I got asked last year and it actually came up, full breakdown and everything. These guys are clearly updating it constantly."
Validate word abbreviation and reconcile two abbreviations
Implement a function isValidAbbreviation(word: string, abbr: string) that returns true if abbr is a valid abbreviation of word, where a positive integ...
Copy linked list with random pointers efficiently
Given the head of a singly linked list where each node has next and random pointers, create a deep copy of the list. First provide an O(n) time, O(n) ...
Determine Superiority of Model A Using Hypothesis Testing
Scenario A search feature marks a user session as a success only if both the relevancy and accuracy binary flags equal 1. Two ranking models were A/B ...
Design Experiment to Test New Hashtag Recommender Algorithm
Experiment Design: Testing a New Hashtag Recommendation Algorithm Context A social app shows hashtag recommendations to users while composing posts. A...
Define Metrics and Account for Network and Novelty Effects
Evaluating Notification-Triggered In-App Surveys Scenario Meta’s notification system triggers optional in-app surveys to measure user sentiment after ...
Analyze Hashtag Follow Behavior with SQL Queries
following_behavior +------------+---------+-----------+---------------+ | date | user_id | hashtag_id| hashtag_source| +------------+---------+-...
Analyze Group Call Adoption Using SQL Queries
CALL_LOGS | call_id | user_id | call_start | call_end | is_group_call | participant_cnt | | 101 | 12 | 2023-08-01 10:00...
Calculate Probabilities for Mixed Reviewer Types
Scenario Two types of reviewers exist in a marketplace: - Lazy reviewers (20%) always give good reviews. - Careful reviewers (80%) give good reviews 6...
Determine Metrics for Group-Video Calling Experiment Success
Scenario You are the data scientist for a large consumer messaging app that currently supports 1:1 video calls. The product team is debating whether t...
Analyze Revenue Shifts to Identify Cannibalization Effects
Cannibalization vs. Organic Growth Across Creation Sources Scenario Management observed strong revenue growth from one creation_source (a channel by w...
Describe Handling Cross-Functional Projects and Changing Priorities
Behavioral & Leadership: Cross-Functional Impact, Feedback, Conflict, Reprioritization Context: You are interviewing for a Data Scientist role. The in...
Expected round of first selection in repeated sampling
Random Perk Selection: Expected First Round Scenario - There are 1,000 employees. - Each round, 10 distinct employees are selected at random for a per...
Identify Unique Callers and French Customer Call Percentage
video_calls +---------+-----------+--------------+---------------------+---------------+ | call_id | caller_id | recipient_id | start_ts | ...
Compute Shop Visibility Rate Using SQL and Python
shop_events | event_id | shop_id | user_id | event_type | event_time | | 1 | 101 | 1001 | view | 2023-07-01 10:05:00 | | ...
Develop a Restaurant-Recommendation Engine with Logistic Regression
Restaurant Recommendation Engine: Metrics, Features, Model, and Evaluation Scenario You are designing a restaurant recommendation engine for a social ...
Design "Restaurants You May Know" Recommendation Algorithm
Food-Delivery: "Restaurants You May Know" Recommendations Context You are working on a food-delivery app with a personalized home page. The team wants...
Calculate Average Session Length and Compare App Performance
user_sessions +---------+------------+------------+---------------------+---------------------+ | user_id | session_id | app | session_start ...
Determine Old vs. New Users' Shop Visibility Changes
SHOP_VISIBILITY_HISTORY +----------+----------------+---------------------+-------------------+---------+ | user_id | user_signup_dt | action_timesta...
Analyze Conversation Engagement and Reaction Usage Effectively
messages +-----------+--------+----------+--------------+---------------------+ | messageid | sender | receiver | has_reaction | timestamp |...
Calculate Video Call Usage Metrics by Country and Date
video_calls +---------+-----------+------------+---------+----------+ | caller | recipient | ds | call_id | duration | +---------+-----------...