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 an extensible poker-hand evaluator
Design and implement an object-oriented solution for a simplified two-player poker-like game called Camel Cards. The interviewer is explicitly evaluat...
Design an In-Memory Pub-Sub Model
Design an object-oriented, in-memory publish-subscribe model. Requirements: - A publisher can publish a message to a topic. - A subscriber can subscri...
Design a To-Do List Service (CRUD, Auth, Rate Limiting, Caching & API Versioning)
This system design question evaluates practical full-stack architectural thinking across REST API design, authentication, rate limiting, and caching i...
Design an A/B Testing Platform
Design an A/B Testing Platform Design a platform that lets product teams define an experiment, assign eligible users consistently to control or treatm...
Design a Charity Donation Website
This question evaluates system architecture and reliability engineering skills, focusing on payment integration, asynchronous processing, idempotency,...
How to stream a large file to 1000 hosts fastest
This question evaluates system design and distributed-systems skills, especially bandwidth and bottleneck analysis, replication and pipelining trade-o...
Design and Implement a Cross-System Object Tracker
Design and Implement a Cross-System Object Tracker Prompt Two independent systems, A and B, observe real-world objects. Each system assigns its own un...
Design camera-footage upload with custody chain
System design prompt You’re building a backend service for uploading recorded body-camera / dashcam footage from client devices (often on unreliable n...
Design a Cloud DevBox Platform
Design a cloud DevBox platform: a service that gives developers disposable or persistent remote development machines, accessible through a browser, SS...
Filter Bad Human Annotations
This question evaluates expertise in data quality and annotation filtering for machine learning, including annotator reliability modeling, noisy-label...
Explain a Technical Decision and Transferable Team Practice
You are asked to discuss two decisions from your experience. Keep the examples specific enough that an interviewer can distinguish your personal judgm...
Debug a Python Aggregation Loop with Dictionaries and Lists
Review a Python aggregation routine that uses dictionaries, lists, and loops, then explain how you would make it correct and robust. This interview ex...
Count Substrings with No Repeated Characters
Count Substrings with No Repeated Characters Given a lowercase English string s, return the number of nonempty contiguous substrings whose characters ...
Solve a Jigsaw Puzzle
You are given a collection of jigsaw puzzle pieces. Each piece has four edges — top, right, bottom, and left — and a helper function match(edgeA, edge...
Design Human Avoidance for Warehouse Robots
This question evaluates sensor fusion, perception-to-motion data flow, short-horizon motion planning, and real-time safety-critical decision-making fo...
Design an Ad Assignment API
Design an HTTP API that exposes an ad-assignment function as a production service. The underlying function is given a user, a list of browser position...
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...
Demonstrate Senior Engineering Judgment
Prepare concise behavioral stories that demonstrate senior engineering judgment through difficult projects, competing priorities, disagreement, influe...
Explain GPU Memory And Matrix Transpose Optimization
Study GPU software engineering fundamentals through concepts like warps, registers, shared memory, coalescing, cache behavior, tiling, and matrix tran...
Design a news aggregator system
Rippling Onsite — Two Parts This Software Engineer onsite has two parts: a system design and a short coding follow-up. Both are below. Treat them as o...