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 high-throughput distributed rate limiter
Question Design a high-throughput, distributed rate-limiting service that runs across multiple regions with low latency and burst tolerance. The servi...
Design a concurrent web crawler
Web Crawler System Design (Onsite) Problem Design and implement a concurrent web crawler that: - Starts from a given URL. - Uses a provided interface ...
Design API for split-stay combinations
Question Design an HTTP API endpoint that, given a requested date range and a collection of Airbnb listings with their availability, returns all valid...
Count Digit-Reversal Equivalent Pairs
Define flipdigits(x) as the integer produced by reversing the decimal digits of non-negative integer x and removing leading zeroes from the reversed r...
Detect Currency Arbitrage After a Cycle Fee
Detect Currency Arbitrage After a Cycle Fee You are given a matrix of positive currency exchange rates, where rates[i][j] units of currency j are rece...
Count Bounded Buy-and-Sell Sequences
Count Bounded Buy-and-Sell Sequences You start with k shares. On each transaction day, you either buy one share or sell one share, but holdings may ne...
Design a Top-K trending service
This question evaluates skills in distributed system design, real-time stream processing, scalable aggregation, windowing semantics, and trade-offs ar...
Design a secure trading app on AWS
Scenario Design a secure, Robinhood-like mobile/web application on AWS, with a deep dive into: 1. User profile management (account creation, authentic...
Design a Scalable Product Authentication Platform
Design the authentication infrastructure for a cloud product. Users log in with email and password; the design should be able to add external identity...
Search Book Titles
You are given a list of book titles and a user query string. Return all titles that are relevant to the query. A title is considered relevant if any t...
Design personalized restaurant search and recommendations
This question evaluates a candidate's expertise in designing scalable, personalized restaurant search and recommendation systems, including system arc...
Design scalable worker pool for template jobs
You have implemented a function that takes a template string (or many template strings) and replaces placeholders like {{db_host}} and {{db_port}} usi...
Explain a project deeply
This question evaluates a candidate's ability to communicate technical ownership, system architecture, decision-making, and operational problem-solvin...
Design a RAG Ranking Pipeline
This question evaluates expertise in retrieval-augmented generation, information retrieval and ranking, indexing and offline data pipelines, model int...
Design an ad recommendation and ranking system
You are building an ad recommendation/ranking system for a content feed (e.g., short-form videos). At each feed position, you may show either an organ...
Compute signup rate and retention from raw logs
Scenario You are analyzing an A/B test for a marketing campaign offering a free 1-month trial. You are given raw “upstream” tables that resemble produ...
Explain parallelism and collectives in training
Parallelism strategies and communication in large-scale training You are designing a distributed training setup for very large neural networks that ca...
Find minimal time for four people crossing
Assume there are four people who need to cross a narrow bridge at night using a single flashlight. - Each person \(i\) requires a different, known amo...
Describe a major challenge you faced
In a behavioral interview for a software engineering or technical role, you are asked: > Describe the most significant challenge you have faced in an ...
How would you optimize large-scale training/inference?
This question evaluates a candidate's skills in ML system design, GPU/CUDA performance engineering, and distributed training and inference optimizatio...