Machine Learning Engineer System Design Interview Questions
Practice 35 real System Design interview questions for Machine Learning Engineer roles. From companies including Meta, OpenAI, Amazon, Snapchat, Microsoft.
"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."
Design Duplicate File Detection
Design a system to find duplicate files. Start with a single-machine version: given a large directory tree, identify groups of files that have identic...
Design Real-Time Collaborative Editing
Extend the text editor to support real-time collaboration among multiple users. Requirements: - Multiple users may edit the same document concurrently...
Design an S3-like object storage service
Design a cloud object storage service similar to Amazon S3. The service should allow clients to upload, store, and download large files reliably and e...
Design personalized restaurant search and recommendations
Scenario You are designing a DoorDash-like personalized restaurant recommendation system. A user types a free-text query (e.g., “spicy ramen under $20...
Design chat and online chess
Design two large-scale consumer systems: 1. A workplace messaging platform similar to Slack. It should support organizations, channels, direct message...
Design a regional surge pricing strategy
Scenario You operate a ride-hailing platform. You need to design a system that sets surge multipliers (dynamic pricing) for a given region. Task Desig...
Validate virtual credit card transactions from encoded IDs
You are designing logic for a virtual credit card product. Part 1: Product reasoning Explain key benefits and drawbacks of virtual credit cards for: -...
Improve and debug the shopping app
You are evaluating a live-shopping mobile app from a product-minded engineering perspective. Answer the following as one integrated exercise: 1. What ...
Design a search query autocomplete system
Question Design a search autocomplete system that suggests completions as the user types. Requirements - Sub-100ms latency per keystroke. - Suggestion...
Design an Online Coding Judge
Design a large-scale online coding practice and interview platform similar to a programming challenge website. The system should support: - browsing c...
Optimize MapReduce performance
MapReduce Model and Optimization for Parallel Efficiency and Network Utilization Context You are designing a large-scale batch processing job (e.g., f...
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...
Implement compiler for custom language
Design and implement a simple compiler/interpreter Goal Design and implement a small compiler/interpreter for a bespoke toy language in your preferred...
Design versioned in-memory key-value store
You are asked to design an in-memory key–value store that supports versioning and rollback. Requirements - Store key–value pairs in memory (string key...
Design a multimodal RAG assistant
Prompt Design a Retrieval-Augmented Generation (RAG) system that can answer user questions using an internal knowledge base containing multiple modali...
Design a collaborative spreadsheet backend
Design a web-based spreadsheet service similar to Google Sheets, with emphasis on backend architecture and data models. Focus areas: - Multiple users ...
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...
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 Apple News without ML
Design an initial search and content-discovery system for a news application similar to Apple News, assuming you do not have a trained ranking model y...
Design and implement a tiny language runtime
Minimal Imperative Language — Design and Implementation Task Context You are asked to design and implement a minimal imperative language and its tooli...