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 rare-book lending and returns system
Design a rare-book lending and returns system System Design: Rare Books Circulation Across Multiple Branches Context Design a system to manage borrowi...
Implement an interactive CLI class with tests
Design and implement a command-line interactive application as a single class using OOP principles. The program should support commands: add <key> <va...
Explain a Challenging Project, Influence, and Mentorship
Build a coherent behavioral interview narrative spanning a challenging technical project, influence without authority, and mentorship. Clarify your ow...
Design a temporary email service
Design a Disposable Email Service with Auto-Expiring Addresses Design a receive-only disposable email service (e.g., 10‑minute inboxes) that issues au...
Solve stock profit and vertical tree traversal
You have a 60-minute coding interview with two algorithm questions: 1) Max profit from one stock trade - Input: an integer array prices, where prices[...
Compute Commuter Ride Probabilities
This question evaluates competency in probability theory—specifically conditional probability, marginalization, Bayesian inversion, and expectation of...
Debug ML pipeline and build text parser
You are in a hands-on, hour-long ML-engineering working session (Scale AI, Machine Learning Engineer loop). You are given a small ML project — data lo...
Choose Your Workplace Style
You are taking a forced-choice workplace-style assessment for a Software Engineer role. Each item contains three positive statements. For each item: 1...
How should you evaluate unconnected content?
A social media platform has launched a feed feature that increases the share of unconnected content, meaning posts from creators who do not have an ex...
Design a subscription push service
Design a subscription push service Object-Oriented Design: Publish/Subscribe Notification Service Design an object-oriented publish/subscribe notifica...
Design an ads event reporting system
This question evaluates a candidate's ability to design scalable, reliable event ingestion and analytics systems, testing competencies in distributed ...
Design Points-from-Transactions Service
Design a Scalable Loyalty Points Service (USD → Points at 1 USD = 1.5 Points) You are designing a service that awards loyalty points for purchase tran...
Match readings with latest same-city humidity
Problem You are given two time-sorted lists of sensor readings: - Temperature records: (time, city, reading) - Humidity records: (time, city, reading)...
Debug a broken Transformer implementation
You are given a small Transformer model implementation (e.g., in PyTorch) plus a tiny training script. The code executes, but the model does not match...
Design a highly reliable account balance system
Scenario You are designing a backend service that stores and updates user account balances (like a wallet/bank ledger). The system must be highly reli...
How would you use propensity score matching here
You want to estimate the causal effect of a new recommender feature on 7-day retention. The feature was not randomized: users “opt in” after seeing a ...
Elements Occurring More Than n/3 Times in a Sorted Array
This question evaluates a candidate's ability to design frequency-counting algorithms over sorted arrays, testing knowledge of majority-element patter...
Design a production file storage service
System Design: Production-Grade File Storage Service Problem Design a production-grade file storage service with the following APIs, semantics, and co...
Implement dasher active-time calculator
Implement a function that, given a dasherId, a local pay-period interval [startLocalDateTime, endLocalDateTime), and a list of order events of the for...
Implement NumPy neural-network layers
This question evaluates competency in implementing neural-network layers and array algebra in NumPy, including matrix multiplication, broadcasting rul...