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."
"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."
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...
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 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 ...
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...
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...
Implement LRU cache and copy random list
Coding questions (two parts) Part A — Deep copy a linked list with random pointers You are given the head of a singly linked list where each node has:...
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 nested depth sum and grid distance
Problem A: Weighted sum of integers in a nested list You are given a nested list structure that may contain integers or other nested lists. Define the...
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...
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...
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 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...
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...
Answer core behavioral questions using STAR
Prepare structured answers (use STAR: Situation, Task, Action, Result) for the following common behavioral prompts: 1. Most proud project: Describe a ...
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 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 ...
Answer impact, conflict, and difficult coworker questions
Behavioral questions 1. Describe the most impactful project you have worked on. 2. Tell me about a difficult person you have worked with. 3. Describe ...
Find longest palindromic substring
Given a string s, return the longest contiguous substring of s that is a palindrome. Input - A single string s. Output - A string representing the lon...
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...
Implement solutions to several coding tasks
You are given several independent coding interview tasks. Solve each with the required time/space complexity. Problem 1: Find the minimum in a rotated...