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."
Answer core Python, CS, DB, and testing questions
This multi-part prompt evaluates core software engineering competencies including Python fundamentals (OOP, object/model behavior, iterators/generator...
Explain approach to behavioral Likert assessment
Explain approach to behavioral Likert assessment Behavioral SJT: Strategy and Examples Context You are completing a 60-item behavioral situational jud...
Design reliable high-volume chatbot system
This question evaluates a candidate's ability to design scalable, highly available, and fault-tolerant backend architectures for stateful chatbot serv...
Design a prompt processing backend
Design a prompt processing backend System Design: Background Processing Backend for LLM Prompts Context Design a multi-tenant backend that processes l...
Design an image crawler for unlimited URLs
Design a service that crawls images starting from a set of root URLs. Requirements: - Input: one or more root URLs. - Crawl pages, discover links, and...
Choose Optimal Network Retry Threshold
You work on a mobile music streaming team responsible for improving playback reliability while minimizing battery drain. When the app is streaming aud...
Design bookstore and chat messaging systems
This question evaluates a candidate's competency in large-scale system design, including distributed systems architecture, data modeling, consistency ...
Design a Ticketmaster-like ticketing system
This question evaluates system design and distributed-systems competencies for an online event ticketing platform, focusing on scalability, concurrenc...
First Non-Repeating Character in a String
This question evaluates a candidate's ability to work with hash maps and character frequency counting in string processing. It tests practical coding ...
Boolean Expression Tree with Leaf Flips
This question evaluates a candidate's ability to work with tree data structures and apply efficient update propagation techniques. It tests practical ...
Streaming Points: Remove Any Pair Within a Distance
This question evaluates practical use of ordered data structures for streaming input with proximity-based removal logic. It tests balanced BST or sort...
Design Siri-vs-GPT query routing
You are a Data Scientist at Apple designing a feature that decides whether a user's natural-language query should be routed to Siri or to a GPT-based ...
Compare WebSocket, SSE, and long polling
You are building real-time features for a web application and the interviewer probes your networking fundamentals across several layers of the stack. ...
Build an Account Transfer Ledger
This question evaluates the ability to implement transaction processing, state management, validation of transfers (including rejects and platform len...
Implement Concurrent Utilities in C++
This question evaluates proficiency in C++ concurrency and generic programming, specifically multithreaded parallel execution, synchronization primiti...
Find Maximum Candies With Two Types
You are given a row of candies represented by an array candies, where candies[i] is the type of the candy at position i. You may choose any starting p...
Answer HR screening questions for data role
** HR HR 1. 2. 3. 4. 5. 6. 7. 8. 30 HR **
Compute extinction probability in a branching process
Compute extinction probability in a branching process You start with 1 cell at time 0. Every minute, each existing cell independently transitions with...
Explain benefits of a lockfile
When running a JavaScript app using package managers like npm or yarn, what is the purpose of a dependency lockfile (e.g., package-lock.json or yarn.l...
Model Shot Success by Location
This question evaluates a candidate's skill in spatial probabilistic modeling, feature engineering, calibration, uncertainty quantification, and handl...