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."
Evaluate word-guess feedback with repeats
You are implementing feedback for a Wordle-like guessing game. Part 1 — Produce feedback for one guess You are given two strings of equal length guess...
Evaluate variables in simple arithmetic DSL
You are given a small DSL (domain-specific language) consisting of variable assignments, one per line. Each line has the form: `text <identifier> = <e...
Implement string reduction and time map
In a coding interview, you are asked to solve two algorithm problems. 1. String reduction with adjacent duplicates - Basic version: Given a string ...
Assign 2n Workers to Two Tasks to Minimize Total Time
You manage 2n workers and two tasks, A and B. Every worker must be assigned to exactly one task, and each task must be staffed by exactly n workers. W...
Debug Tensor Conversion Bugs
You are given a small tensor utility library used in distributed numerical code. The implementation has several bugs related to aliasing, array conver...
Write monthly customer and sales SQL queries
You are analyzing a food-delivery marketplace. Tables Assume the following schema (you may add minor helper CTEs as needed): orders - order_id (BIGINT...
Implement sin(x) with precision constraints
Coding Question: Implement sin(x) Implement a function that returns an approximation of the trigonometric sine function. Function signature - Input: a...
Find longest substring without repeating characters
Problem Given a string s, return the length of the longest contiguous substring that contains no repeated characters. Input - s: a string (may contain...
Implement Fibonacci with efficiency constraints
Write a function fib(n) that returns the nth Fibonacci number (0-indexed: fib(0)=0, fib(1)=1). Requirements: - Handle n up to at least 10^6. - Discuss...
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...
How do you expand nested placeholders in strings?
You are given a dictionary of string templates. Keys are identifiers like X, Y, Z. A template may contain placeholders of the form %KEY%, which should...
Implement a versioned recipe management system
You are asked to implement an in-memory Recipe Management System (similar in difficulty to a simple banking/in-memory DB exercise). The system support...
Design an online chess game with undo and leaderboard
This question evaluates proficiency in real-time system design, state management, and concurrency control for multiplayer games, including consistency...
Count same-color squares in a character grid
You are given a 2D grid (matrix) of characters. Each character represents a color: cells with the same character are considered the same color. Formal...
Implement course scheduling and rate limiter analysis
You are given two independent coding problems. --- Problem 1: Course Scheduling You are planning to take a set of courses and are given prerequisite r...
Count connected land components in a grid
You are given a 2D grid of characters where: - '1' represents land - '0' represents water A group of land cells forms an island if they are connected ...
Find two numbers that sum to target
Given an integer array nums of length n and an integer target, return the indices (i, j) (0-based) of two distinct elements such that nums[i] + nums[j...
Implement a basic pivot table with totals
You are given a small in-memory table of data and are asked to implement a simplified pivot table operation and a printer for it. Assume the input dat...
Implement sqrt and parity-based array rearrangement
You are given two independent coding tasks. --- Task 1: Implement Square Root Without Math Library Implement a function that computes the square root ...
Compute probability of random arithmetic progression triple
You have the integers from 1 to 30 inclusive. You randomly choose 3 distinct numbers without replacement, and all 3-element subsets are equally likely...