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 Large-Scale Inference Serving
Design a production inference serving system for a machine learning model used by 100 million daily active users. Your answer should cover: traffic as...
Explain BLS vs CLS; compute t-stats
Part A — Concepts: Define Brand Lift Study (BLS) vs Conversion Lift Study (CLS) in ads measurement. List key bias/variance sources for each (e.g., non...
Design a recommendation system end-to-end
Design a Recommendation System End-to-End You are asked to design a large-scale recommendation system that powers a personalized feed — for example, a...
Design a news feed aggregator
Design a Large-Scale News Aggregator and Personalized Feed Design a production-ready news aggregation and personalized feed platform — think a consume...
Implement an Extensible Chatbot App
Implement a ChatApp class that processes user messages and routes them to bot responders. The system must support multiple bot types, and the design m...
How to answer common recruiter screen questions
Question You are in an initial recruiter / phone screen for a software engineering role at OpenAI. The recruiter asks a mix of logistics, employment-h...
Diagnose Return Eligibility Scoring Bugs
You are working on an e-commerce return-eligibility service. For each return request, the service computes a risk score using signals such as: - how m...
Describe a challenging project
You are interviewing for an L5 Data Scientist role. Answer the following behavioral questions in a way that demonstrates Deliver Results: 1. Tell me a...
Design a malicious-URL checking service using an isMalicious API
This question evaluates system design competencies such as scalable API design, caching and cache invalidation strategies, rate limiting and backpress...
Most Frequent Call Stack from Profiler Samples
This question evaluates a candidate's ability to design an efficient hashing and frequency-counting solution over sequences, along with careful handli...
Validate a Shopping Cart
This question evaluates the ability to implement robust input and business-rule validation for shopping-cart items, including data integrity checks, i...
Assess free-month promotion impact
This question evaluates a data scientist's competency in experimental design, causal inference, metric definition and prioritization, bias identificat...
Design a restaurant reservation system
This question evaluates system design competencies including API design, data modeling, distributed systems considerations, consistency and transactio...
Implement a rate limiter and a pub/sub API
This question evaluates competency in concurrency control, synchronization, API and low-level system design, and messaging system concepts by combinin...
Choose best/worst actions in workplace ethics scenarios
You are taking a situational judgment test (SJT). For each scenario below, the test presents four possible actions. You must select: - Most likely / b...
Design a user behavior monitoring system
System Design: User Behavior Monitoring System You are asked to design a monitoring/analytics system that collects user behavior events from clients (...
Design Search Autocomplete
Design a large-scale autocomplete service for a search engine. As a user types a query prefix, the system should return the top 5 suggested full queri...
Design several large-scale systems
This prompt evaluates expertise in large-scale system architecture and distributed systems, including competencies in API and storage design, scalabil...
Describe disagreement with leadership and your approach
Give an example where you disagreed with a leader (your manager, a VP, CTO, etc.). - What was the disagreement about (technical direction, priorities,...
Design an extensible expense rule evaluator
This question evaluates system-design and API/interface skills for rule engines, focusing on data modeling, extensibility, maintainability, and rule/r...