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."
Apply Multiple Testing Corrections for Valid Results Analysis
Apply Multiple Testing Corrections for Valid Results Analysis Interpreting 30 Parallel A/B Tests With Mixed Results Context - You ran 30 independent w...
Calculate Defect Rate and Identify Top Lanes for Carriers
shipment +-------------+----------+-----------+---------+---------+-------------+-----------+ | shipment_id | order_id | ship_date | carrier | origin ...
How to Architect a Personalized Ads Serving System
How to Architect a Personalized Ads Serving System Full-Funnel Ads Serving System Design Scenario You are asked to architect a full-funnel advertising...
Calculate Average Event Value by User ID
events +----+---------+------------+-------+---------------------+ | id | user_id | event_type | value | timestamp | +----+---------+-------...
Explain Shell Script Line-by-Line for Data Science Workflows
Scenario Technical screening for a Principal Data Scientist: reviewing shell script and Python classes Question Explain, line by line, what the provid...
Calculate User Deviation from Team Average Messages
usage_stats +---------+---------+---------------+------------+ | user_id | team_id | messages_sent | date | +---------+---------+---------------...
Implement Reservoir Sampling; Analyze Time and Space Complexity
Scenario Process an unbounded stream of user IDs and maintain a uniform random sample of k users in memory. Question Implement reservoir sampling for ...
Select Top Customers Using Transaction Data Filters
transactions +----+---------+------------+--------+ | id | user_id | order_date | amount | +----+---------+------------+--------+ | 1 | 101 | 202...
Improve YoY Revenue Analysis with Complementary Metrics
ads_revenue +------------+-----------+ | date | revenue | +------------+-----------+ | 2023-01-01 | 120000 | | 2023-02-01 | 125500 | | 2...
Assess Work Authorization and Professional Experience for Job Change
Assess Work Authorization and Professional Experience for Job Change Initial HR Phone Screen — Behavioral Questions (Data Scientist) Context You are i...
Explain Causal-Inference Techniques in Your Machine Learning Project
Explain Causal-Inference Techniques in Your Machine Learning Project Technical Deep-Dive: ML Project With Causal Inference Prompt Walk me through one ...
Identify Bugs in Python Script for User Assignment
Scenario A simple Python script assigns users to experiment groups and triggers the free-trial offer. Question Inspect the script and list any bugs or...
Address Missing Income Bracket in California Housing Data
Address Missing Income Bracket in California Housing Data ML Case: Missing Lowest-Income Bracket in California Housing Data Context You're building a ...
Design Algorithm for Longest Substring with K Distinct Characters
Scenario Tech interview round 2 – sliding-window algorithm Question Design an algorithm that finds the length of the longest substring containing at m...
Leverage Existing Model for Low Credit Score Applicants
Leverage Existing Model for Low Credit Score Applicants Expanding a Credit-Risk Model to a New Score Band Scenario Your current probability-of-default...
Expand Internationally: Data and Strategy for Market Entry
Expand Internationally: Data and Strategy for Market Entry Behavioral + Product Sense (Onsite) Context You are interviewing for a Data Scientist role ...
Describe Handling Conflict and Providing Constructive Feedback
Describe Handling Conflict and Providing Constructive Feedback Behavioral & Leadership Interview Prompts (Data Scientist) Context You are interviewing...
Optimize Driver Repositioning for Minimal Pickup Time
Scenario Design and implement algorithms for ride-sharing dispatch and capacity planning. Question Given historical rider demand density and current d...
Investigate Causes of Driver WOW Score Drop
Investigate Causes of Driver WOW Score Drop Investigating a 10% QoQ Drop in Driver WOW (Satisfaction) Context Assume WOW is a standardized driver sati...
Compare RNNs and Transformers for Long-Sequence Text Classification
Compare RNNs and Transformers for Long-Sequence Text Classification Scenario You are designing a long-sequence text classification system under tight ...