Meta Machine Learning Engineer Interview Questions
Meta Machine Learning Engineer interview questions typically probe both algorithmic skill and practical ML judgment. At Meta you should expect a mix of coding (data structures and algorithms), applied ML and modeling questions, ML-system design, and behavioral/leadership rounds that focus on impact, collaboration, and product thinking. What’s distinctive is the emphasis on production-ready thinking: interviewers evaluate how you translate models into scalable systems, choose metrics, reason about data and bias, and trade off latency, cost, and reliability in real-world settings. Recent pilots also include AI-assisted coding components in some interviews, so being fluent with modern developer workflows can help. For interview preparation, prioritize three threads: sharpen algorithmic coding (medium-to-hard problems), deepen practical ML fundamentals (evaluation metrics, debugging, feature engineering, model degradation), and practice end-to-end ML system design at scale (data pipelines, monitoring, deployment). Prepare STAR stories that show ownership and cross-team impact, and rehearse clear, structured explanations of trade-offs. Expect a timed loop of 4–6 focused interviews and a hiring committee review, so consistent performance across rounds matters more than a single standout answer.

"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."
Debug and optimize a card-drawing strategy
You are given a simplified card game engine with unit tests. The game is played using a table of face-up cards; each card has an integer value. On eac...
Design a recommendation system from scratch
Recommendation System Design (two scenarios) Design a recommendation system from scratch. Cover both scenarios: 1. Location/POI recommendation: Recomm...
Design an image copyright-violation detection system
Design an ML system that detects whether a user-uploaded image violates copyright. Requirements - Input: an image uploaded by a user (optionally with ...
Find shortest path in a maze grid
Maze shortest path You are given a 2D grid maze of size m x n where: - 0 represents an open cell - 1 represents a wall (cannot pass) You are also give...
Design an ads ranking system with calibration
ML System Design: Ads Ranking (e-commerce) Design an online ads ranking (ad “re-ranking”) system for an e-commerce app. The system receives a request ...
Maximize unique characters from a word list
Maximize Unique Characters From a Word List You are given a list of strings words. You may select any subset of these strings (each string used at mos...
Find two numbers summing to target without hashmap
Problem Given an integer array nums (length n) and an integer target, return the indices (i, j) such that: - i != j - nums[i] + nums[j] == target You ...
Design a system to detect weapon posts
System Design: Detect weapon-related posts Design a system for a social media platform to detect and moderate posts that contain weapons. A "post" may...
Design a weapon-ad harmful content detection system
Scenario You are building a system for an ads platform that must detect advertisements that contain weapons (e.g., guns, knives) and prevent policy-vi...
Solve four OA string/array/matrix/graph tasks
You have 4 independent coding tasks. 1) Uppercase vs lowercase count difference Given a string s consisting of ASCII letters (and possibly other chara...
Design a weapon-sale ad detection system
Design an end-to-end ML system to detect and take action on ads/listings that attempt to sell weapons (or weapon-related prohibited items). Your syste...
Implement weighted random sampling with preprocessing
Weighted Random Sampling (with performance follow-up) You are given an array of positive weights w[0..n-1]. Implement a data structure that supports: ...
Solve frequency and tree-completeness problems
Problem A: Return the k most frequent values You are given an integer array nums and an integer k. Task: Return the k distinct values that occur most ...
Design Nearby and Notification Ranking
Two machine learning system design prompts were mentioned: 1. Nearby place recommendation for a mobile user Design a real-time recommendation syste...
Design comment ranking for a news feed
Design an ML-powered system to rank comments under posts in a news feed product. Requirements - For each feed item (post/story), users can open the co...
Compute the next lexicographic permutation
Problem Given an integer array nums representing a permutation of its elements, modify the array in-place to produce the next lexicographically greate...
Implement exponentiation and fill grid distances
You are given two separate coding tasks. Task 1: Implement fast exponentiation Implement a function pow(x, n) that returns \(x^n\). - Input: - x: a ...
Deep copy a linked list with random pointers
Problem You are given the head of a linked list where each node has: - val: integer value - next: pointer to the next node (or null) - random: pointer...
Design weapon-selling ad detection from posts
ML System Design: Detect weapon-selling ads from user posts You work on a platform with user-generated content (UGC): posts may include text, images, ...
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...