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."
Find first error and propagate failures
You are given a chronological log history where each entry is a string prefixed with one of [Info], [Warn], or [Error]. Two invariants hold: ( 1) once...
Find returning users from access logs
Given a large user access log, parse it and identify which user_ids are returning customers—i.e., they have at least one visit on two or more distinct...
Debug a Hive query
You are given a prewritten Hive SQL query that produces incorrect results. Describe how you would debug it: identify logical errors (e.g., join condit...
Compute currency conversions with graph algorithms
Question You are given a set of pairwise currency exchange relations such as A:B = 1:1.5 and B:C = 1:1.5, meaning 1 A = 1.5 B and 1 B = 1.5 C. Design ...
Find longest segment with endpoints > interior
Given an integer array nums, find the length of the longest contiguous segment [i..j] (j−i+1 ≥ 2) such that both endpoints are strictly greater than e...
Implement top-K over a stream
Given a high-volume stream of events (e.g., account IDs from new account openings), design and implement a data structure that supports: ( 1) insertin...
Implement and vectorize NumPy Conv2D
Implement a 2D convolution operation from scratch using NumPy only (no TensorFlow or PyTorch). Assume NCHW input shape (N, C_in, H_in, W_in) and weigh...
Fill rooms with nearest gate distances
You are given an m×n integer grid representing rooms, where -1 is a wall, 0 is a gate, and INF (a large sentinel such as 2^31− 1) is an empty room. Fo...
Compute build order from dependencies
Given a set of package build dependencies, output a valid build order so that each package is built only after all of its dependencies. The input is a...
Find horizontal cut balancing square areas
Given a 2D table with top-left origin (0, 0), you are provided a finite set of n non-overlapping, axis-aligned square cakes. Each square i has real-va...
Implement exponentiation and link tree neighbors
Solve two independent tasks. Task A — Fast exponentiation: Implement fastExponent(x, n) that returns x raised to the integer power n, where x is a dou...
Write SQL to Join Merchants and Triple Restaurant Points
You are given: ( 1) a CSV file merchants.csv with columns: merchant_name, merchant_code, category; ( 2) a database table transactions(user_id INT, mer...
Find connected region sizes in matrix
Given an m x n grid of characters grid and a target character ch, implement: ( 1) sizeOfRegion(grid, r0, c0, ch) -> int that returns the size of the 4...
Compute maximum simultaneous drivers
Given N driver online intervals [start_time, end_time) during a day, compute the maximum number of drivers simultaneously online at any moment. Handle...
Implement file deduplication at scale
Implement a command-line tool to find duplicate files in a directory tree. Use OS/pathlib primitives to recursively enumerate files. Apply prefilters ...
Implement snake game and find org LCA
Part A — Snake Game Engine: Implement a grid-based snake game. The board has height H and width W (0-indexed, row-major). The snake starts at (0, 0) m...
Compute exclusive times and call stack from logs
Design an algorithm that, given a single-threaded program's execution log, computes per-function exclusive durations and reconstructs the active call ...
Compute max profit across dated stock quotes
You are given an unsorted list of price records for multiple stocks, each record as (date, symbol, price). Dates may be repeated across different symb...
Implement Python LRU cache with varargs
Implement an LRU cache in Python as a decorator cache(maxsize) that memoizes a target function's results. Must support positional args, args, and *kwa...
Simulate one-round color elimination on a grid
Given an m x n integer matrix board where board[r][c] > 0 represents a color and 0 represents empty: ( 1) A nonzero cell at (r,c) explodes in this rou...