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 bank with scheduled payments and merges
Design an in-memory banking service that supports the following operations: ( 1) CreateAccount(accountId), ( 2) Deposit(accountId, amount), ( 3) Trans...
Find largest subset sharing a common digit
You are given a list of two-digit integers (each from 10 to 99, inclusive). You want to select as many numbers as possible in one selection such that:...
Solve sampling and streaming tasks
This question evaluates algorithmic problem-solving, data structure design, probabilistic reasoning for weighted random selection, sliding-window stri...
Decode an Encrypted Paragraph Tree
Decode an Encrypted Paragraph Tree A document is stored as a tree of paragraphs. Each node holds a paragraph text — a string of lowercase English lett...
Maximum Currency Conversion Rate
Maximum Currency Conversion Rate You are given N currency exchange rate pairs. Each pair is a triple (from_currency, to_currency, rate), meaning that ...
How would you measure misinformation impact and recommendation bias?
This question evaluates a data scientist's analytics and experimentation competencies — including metric and diagnostic design, sampling and labeling ...
Solve Grid and Counting Problems
A software engineering intern phone screen included two coding tasks: 1. Count islands in a grid Given an m x n grid of characters where '1' re...
Maximize Capital by Completing at Most k Projects
A startup has an initial amount of capital w and is choosing which projects to take on before an important funding deadline. There are n candidate pro...
Answer basic probability and statistics questions
This question evaluates core probability and statistics competencies, including interpretation of Poisson rate parameters from PMF shapes, identificat...
Compute SHOP spend share and model performance
You work on ads measurement. Advertisers can drive users to either Facebook Shop ('SHOP') or their own website ('WEBSITE'). After an ad is shown, you ...
Define and estimate prevalence of unhealthy users
This question evaluates a data scientist's ability to operationalize an "unhealthy user" metric and compute its prevalence from session duration and d...
Test if social users are more engaged
This question evaluates a data scientist's competencies in observational analytics, engagement metric selection, cohort construction for overlapping b...
Update Box Probabilities After Drawing Red Balls
Three boxes are equally likely to be selected: - Box A contains two red balls. - Box B contains one red and one blue ball. - Box C contains two blue b...
Derive the Long-Run Sex Ratio Under a Stopping Rule
Assume each child is independently equally likely to be a girl or a boy. Every family continues having children until its first boy, then stops. For a...
Solve classic array, graph, and parsing problems
Implement and analyze solutions to the following independent tasks: 1) Expression evaluator: Given a string s of digits, '+', '-', '*', '/', and space...
Implement basic expression evaluator
Implement a function to evaluate a string expression containing non-negative integers, '+', '-', '*', '/', and spaces. Multiplication and division hav...
Design file deduplication across nested directories
Design and implement a file deduplication tool that, given a root directory, identifies groups of duplicate files. Requirements: traverse nested direc...
Find largest digit-sum bucket size
You are given two integers low and high (inclusive). Define s(x) as the sum of the decimal digits of x. For every integer x in [low, high], place x in...
Detect n-length consecutive sequences
Given an unsorted collection of integers and a parameter n > 0, determine whether there exists a set of n distinct integers that form a run of consecu...
Compute matrix trace and support updates
Given an n x n integer matrix M, implement a function trace (M) that returns the sum of its main diagonal. Follow-ups: (a) If you receive q point upda...