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."
Process Delimited Product, Promotion, and Shelf Records
Process Delimited Product, Promotion, and Shelf Records You are given product records such as a100|apple|6|123, where the fields are SKU, name, quanti...
Largest Subset With Positive Bitwise AND
Problem Implement largest_positive_and_subset(nums). Choose a nonempty subset of the given nonnegative integers. The subset is valid when the bitwise ...
A Project You Decided Not to Ship
This question evaluates judgment and ownership by asking about a project abandoned before release rather than one that shipped. It tests decision-maki...
Enumerate 4x4 Tic-Tac-Toe Games
You are given an empty $4 \times 4$ board. Two players, X and O, alternate turns with X moving first. A player wins as soon as they place three of the...
Review and Improve a Flawed Design Document
Review and Improve a Flawed Design Document You are given a design document for a system that has important omissions or unsafe assumptions. Review it...
Design signup and login service
Design a basic email/password authentication service that supports user sign-up and login. You may not rely on third-party identity providers (no OAut...
Design an Ad Pacing System
Design an advertising pacing system for a large-scale video / streaming advertising platform. Advertisers create campaigns with budgets, flight dates ...
Design multi-region banking data synchronization
System design: Global bank with multi-region data consistency A digital bank operates in multiple geographic regions (e.g., EU, US, APAC). Users can l...
Design Candidate Search And LLM Evaluation Tasks
Prepare for an MLE onsite with three themes: finding top candidates from a job description, reasoning about an unreliable deterministic comparator, an...
Design a Distributed Rate Limiter
This question evaluates expertise in distributed systems and real-time rate-limiting, covering scalability, low-latency design, concurrency control, c...
Design an advertiser metrics tracking platform
This question evaluates object-oriented design competencies such as domain modeling, class responsibilities and relationships, service interfaces, ext...
Design a Scalable Notification System
This question evaluates a candidate's ability to design a large-scale, asynchronous notification platform that fans messages out across push, email, a...
Design Installment-Loan Payment Processing
Design Installment-Loan Payment Processing Design a payment-processing system for an existing user's active installment loan. A payment may be initiat...
Derive Backpropagation for Matrix-Product Layers
Consider a neural-network block whose output is produced by multiplying a sequence of trainable weight matrices together, then applying the resulting ...
Reason About a Movie Billboard Rotation Component
Reason About a Movie Billboard Rotation Component An interview exercise concerns a movie billboard rotation component. The retained description says n...
Design and Implement an Idempotency Layer for Order Creation
Design an idempotency layer above an order creation service so duplicate client retries do not create duplicate orders. `hint Hint 1 Start by stating ...
Build a Payment Fraud Detection Model
This question evaluates a candidate's competency in applied machine learning for payment fraud detection, covering data preprocessing, temporal train/...
Analyze Subscription, Insurance, App, and Card Cases
You are in a Data Scientist "power day" interview for a product analytics role. The interviewer gives you four independent business cases. For each on...
Design a Cloud File Storage Service
Design a cloud file storage and collaboration service similar to Google Drive or Dropbox. At a high level, the service must let users store files in a...
Design Real-Time Collaborative Comments
Design a real-time commenting system for a collaborative canvas or document. Users should see new comments quickly, receive updates on threads, and re...