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."
Rank songs by pairwise user preferences
You are given preference rankings for n users over m songs. Each song is labeled from 0 to m - 1. For each user i (0-indexed), you are given an array ...
Investigating Correlation Between Ad Visits and Reports
Scenario You are on the analytics team at a large social media platform. A positive correlation has been observed between the number of page visits to...
Smallest Palindrome Strictly Greater Than K
A palindrome is a positive integer whose decimal representation reads the same forwards and backwards, with no leading zeros. For example, 7, 44, 121,...
Find longest palindromic substring
This question evaluates knowledge of string algorithms and pattern recognition, focusing on identifying palindromic substrings and reasoning about tim...
Derive expected inversions and mean distribution
This question evaluates understanding of permutation inversion statistics, computation of random-variable moments (expectation and variance), and the ...
Count inversions in a permutation
Problem Given an array a of length n that is a permutation of distinct integers (e.g., 1..n), define an inversion as a pair of indices (i, j) such tha...
Implement simple VM manager with CRUD operations
You are asked to implement a simple in-memory virtual machine (VM) manager that can: - List all VMs - Add (create) a new VM - Modify (update) an exist...
Compute exclusive execution time from logs
Problem You are given execution logs from a single-threaded CPU that runs n functions labeled 0..n-1. The CPU can run only one function at a time. A f...
Derive the Optimal Bid in a Two-Bidder Second-Price Auction
Derive the Optimal Bid in a Two-Bidder Second-Price Auction Two risk-neutral bidders compete for one item in a sealed-bid second-price auction. Your p...
Implement a calendar with non-overlapping bookings
Problem Design a calendar booking system that stores half-open time intervals [start, end) (inclusive of start, exclusive of end). Implement a class w...
Solve three coding problems
The interview note described the following coding questions: 1. Find the N-th license plate in lexicographic order - A license plate has exactly 6 ...
Simulate Uniform(0,1) from random bits
Assume you have access to a function rand_bit() that returns 0 or 1 with equal probability and independent across calls. How would you generate a rand...
Add two big integers from digit lists
You are given two non-empty singly linked lists (or arrays) representing two non-negative integers. The digits are stored in reverse order, and each n...
Solve Banana Speed and Interval Merge
During two technical phone screens for a new graduate software engineering role, the candidate was asked to solve two coding problems: minimum eating ...
Process Transactions and Compute Balances
This question evaluates a candidate's ability to implement stateful transaction processing, accurate integer bookkeeping across accounts and currencie...
Find the k-th largest element in an array
Given an integer array nums and an integer k, return the k-th largest element in the array. Notes: - The k-th largest element is the element that woul...
Explain confounding with an Uber example
Question You are interviewing for a Data Scientist role and are given access to Uber / Uber Eats data. Answer the following about confounding in causa...
Find median of two sorted arrays
You are given two sorted arrays of integers nums1 and nums2 in non-decreasing order. Let the lengths be m = nums1.length and n = nums2.length. Either ...
Phone Keypad Predictive Text Suggestions
Phone Keypad Predictive Text Suggestions You are building the predictive-text feature for a classic 9-key phone keypad. Each digit from 2 to 9 maps to...
Implement staircase printing and distributed mode/median
Problem A: Print a “staircase” pattern Implement a function that prints a staircase with n rows. Input - An integer n (n >= 1) Output - Print n lines....