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 logical model and consumption
Design a logical data model and consumption layer supporting business and technical services architecture. Provide an ERD‑level description for Accoun...
Write SQL for streaming cohort metrics
Given the schema and sample data below, write SQL to answer the three tasks. Use standard SQL (window functions allowed). Assume timestamps are UTC. T...
Aggregate video time and unique pins in Python
Part A (category by average time for videos): You receive a list of pin engagement rows and a category map. pins = [ {"pin_id": 10, "category_id": 1,...
Assess SQL cleaning, mapping, joins, keys, and DDL/DML
You inherit a small retail analytics warehouse. Use the schema and sample rows below to answer all parts. Schema and sample data (minimal rows shown):...
Compute daily net users from event logs
Given an event log, write SQL to compute, for the target date 2025‑09‑01 ("today"), the counts of new users, retained users, churn users, and net user...
Use OrderedDict to dedupe stably
Implement dedupe_preserve_order(seq) that removes duplicates from a list while preserving the order of first appearance, in O(n) time and O(k) space (...
Diagnose DAU drop with SQL by country
Write a single SQL query to diagnose a country-level DAU drop for an email product. Assume today is 2025-09-01. DAU is the count of distinct user_id w...
Compute optimal matrix-chain multiplication order
Matrix Chain Multiplication: Optimal Parenthesization and Analysis You are given five matrices to multiply: A1 (10×30), A2 (30×5), A3 (5×60), A4 (60×2...
Reverse a list in-place
Coding Task: Reverse a List In-Place (Python) Context You're implementing a utility function during a technical screen. The function must reverse a Py...
Write SQL for rolling frequency caps
You work on ad serving with per-user rolling 7-day frequency caps at the campaign level. Assume "today" is 2025-09-01 and t0 = 2025-09-01 12:00:00 UTC...
Design structure for first unique login user
You are given an online stream of user login events. Each event is a user ID (e.g., an integer or string) indicating that this user has just logged in...
Find LCA in a tree and extend to a DAG
This question evaluates proficiency in graph algorithms and data structures, focusing on lowest common ancestor computation in rooted trees and its ge...
Match a string with wildcard pattern recursively
This question evaluates proficiency in string pattern matching, recursive problem decomposition, and algorithmic optimization including handling wildc...
Count Special Subarrays by Modular Frequency
You are given an integer array nums, and two integers modulo and target, where 0 <= target < modulo. Call an index i special if nums[i] % modulo == ta...
Find minimum operations to make array sorted
Problem You are given an integer array a of length n. Define one operation as follows: 1. Remove the first element x = a[0]. 2. Append x to the end of...
Implement popup and redirect in JavaScript
You are working in a browser environment and must use vanilla JavaScript only (no external libraries). Task Implement a function showPopupAndRedirect(...
Implement KV Store and Token Bucket
This question evaluates a candidate's skills in implementing core data structures and concurrent algorithms, specifically in-memory key-value store de...
Minimize operations to reduce price difference
You are managing an inventory of products and want to adjust their prices. There are n products. The price of the i-th product is given by an integer ...
Maximize memory capacity with primary-backup servers
You are helping to optimize the capacity of a cloud system. There are n servers, where n is always even. The memory capacity of the i-th server is giv...
Find longest substring without repeating characters
Problem Given a string s, find the length of the longest contiguous substring that contains no repeated characters. Input - A string s (may contain le...