Machine Learning Engineer + Data Scientist + Software Engineer Interview Questions
Practice the exact questions companies are asking right now.
"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 a geo-distributed rate limiter
Design a rate limiting system that works across multiple geographic regions (e.g., us-east, eu-west, ap-south). Requirements: - Enforce per-API-key li...
Busiest Rental Car
This question evaluates a candidate's ability to simulate a resource-allocation process using interval scheduling and greedy assignment rules. It test...
Build AI-Assisted Full-Stack Transactions App
Build a minimal full-stack app for monetary transactions This is the "AI coding" round: using an AI coding tool of your choice (e.g., Cursor), build a...
Design Camera Health Monitoring
Design a system that monitors the health of 10 million cameras and continuously reports, in near real time, how many devices are healthy and how many ...
Reviewing a Freight-Scheduler Codebase: Bugs, Data Structures, and Concurrency
You have just finished implementing process_order(...) inside a large provided codebase for a freight-scheduling system (this is the review stage of a...
Calculate Driver Payments
This question evaluates a candidate's ability to implement interval arithmetic and overlap computation, perform data deduplication and filtering, hand...
Design Search And Web Crawling Systems
This question evaluates system-design and distributed-systems competencies including large-scale indexing and query-serving, relevance ranking and per...
Fetch and Rank Articles from a Paginated API
Fetch and Rank Articles from a Paginated API Implement top_articles(limit) against a paginated HTTP endpoint. Page p returns JSON with data and total_...
Design an Online Coding Judge
Design a large-scale online coding practice and contest platform. Users should be able to browse programming problems, submit code in multiple languag...
Minimal Unique Word Abbreviations
Minimal Unique Word Abbreviations You are given an array words of n distinct strings. Produce a minimal abbreviation for every word according to the r...
Choose Work-Style Assessment Responses
This question evaluates work-style and behavioral competencies such as initiative, adaptability, dependability, attention to detail, and internal cons...
Compare two rare-event detection models statistically
You are evaluating two models (Model A and Model B) for rare-event detection (e.g., fraud, abuse, medical adverse event). Positives are extremely rare...
Design Broadcast Scheduling APIs
Design a broadcast messaging service for companies. Requirements: - Each company has a set of subscribers. - A client can schedule a message to be bro...
Find a Canonical Shortest Round Trip Through Flights
Find a Canonical Shortest Round Trip Through Flights Problem Implement shortestRoundTrip(flights, start) -> route. Each element of flights is a direct...
Design a smartwatch sensor subsystem
This question evaluates system-level engineering skills for designing a smartwatch sensing subsystem, including sensor selection, trade-offs among acc...
Explain why the t-statistic helps
Suppose you estimate an effect size \(\hat{\beta}\) in a regression model or an A/B test and compute a standard error \(SE(\hat{\beta})\). Explain why...
Design a Payment Processing Service (Merchant to Payment Provider)
This system design question evaluates a candidate's ability to model a distributed payment processing service that coordinates authorization, capture,...
Design a Content Moderation Platform
This question evaluates a candidate's ability to design scalable, ML-driven content moderation platforms, assessing competencies in system architectur...
Explain LLM lifecycle and trade-offs
Explain the end-to-end lifecycle of a modern large language model. Cover training data collection and filtering, pretraining objectives, transformer a...
Validate Sorted Order Under a Custom Alphabet
This question evaluates a candidate's ability to apply custom ordering rules and string comparison logic, a common variant of array and string validat...