Machine Learning Engineer System Design Interview Questions
Practice the exact questions companies are asking right now.
"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."
Design a scalable chatbot platform
Problem Design a production chatbot platform that can answer user questions and hold multi-turn conversations for a product/company. Assume the chatbo...
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 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 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 large-scale near-duplicate video detection
Design a product-grade fuzzy (near-)duplicate detection system for a large short-video platform. You need to detect whether an uploaded video is a nea...
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...
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: -...
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 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...
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 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 scalable service and model performance
System Design: Multi-Region, 50k QPS, p95 < 100 ms Context Design an online, read-heavy key-value service (for example, a user profile or feature look...
Design and implement a word-guessing game
Word-Guessing Game (Wordle-like) — Design and Implement Context Build a small, standalone command-line application that lets a user guess a secret wor...
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 NL-to-SQL performance optimization assistant
Scenario You are building an internal tool for engineers/analysts to ask natural-language questions about database performance (e.g., “Why is the orde...
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 scalable MapReduce pipeline
Design a Large-Scale MapReduce-Style Data Processing System Context You are designing a batch pipeline, using a MapReduce-style architecture, to aggre...
Design a scalable recommendation serving system
Scenario You are designing the online serving infrastructure for a large-scale recommendation system (e.g., a delivery app or e-commerce feed). The in...
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...
Design scalable media storage and delivery
System Design: Global UGC Photos and Short Videos Store/Delivery Context Design a globally distributed system to store and deliver user-generated phot...