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 available reservation time slots
Problem You are building an API to show which time slots are available for booking at a restaurant. You are given: - The restaurant’s opening hours (p...
Design robot path boundedness with repeats
You are given a 2D grid with a set of blocked cells (obstacles) and a robot starting at (0, 0) facing north. The robot executes a finite instruction s...
Design time-versioned KV without timestamp argument
Design a time-versioned key-value store that does not accept a timestamp argument on writes. Support set(key, value) which stores the value with an in...
Define and integrate room ranking factors
Define and integrate room ranking factors Design a Room-Ranking System for Meeting Requests Context You are building a service that assigns conference...
Compute longest palindromic subsequence
Given a string s (1 ≤ |s| ≤ 2000), implement a function that returns the length of the longest subsequence of s that reads the same forward and backwa...
Design payment scheduler with cancel and top-K outgoing
Design and implement an in-memory banking payment component with the following APIs: ( 1) schedulePayment(payerId, payeeId, amount, executeAt) -> paym...
Compute invalid event percentage by pixel
Context You work on an ads pixel instrumentation platform. Each pixel emits events throughout the day; some events are missing (not observed) and some...
Implement binary search from scratch
Question Implement binary search on a sorted integer array without using any library helpers (no bisect, Arrays.binarySearch, etc.). Provide both iter...
Design O(nm) grouping of rearranged strings
Given an array of strings, group together words that are permutations of the same characters. Provide a baseline solution that sorts each word (O(n · ...
Parse Markdown Links Without Regex
Implement a function that converts simplified link syntax text into an HTML anchor tag <a href="url">text</a> across an entire input string. Constrain...
Optimize password transform and discount scheduling
Optimize password transform and discount scheduling Part 1 — Transform to palindromic k-periodic string: Input: a lowercase string currentPassword and...
Implement zigzag level-order traversal
Given the root of a binary tree, return the node values in zigzag level order: visit nodes level by level, reading the first level from left to right,...
Describe challenges and proud accomplishment
Describe challenges and proud accomplishment Behavioral: Significant Challenge and Proud Accomplishment (Software Engineer Onsite) Provide two concise...
Describe diving deep into a problem
Describe diving deep into a problem Behavioral: Dive Deep to Resolve a Complex System Issue Prompt Describe a situation where you had to dive deep int...
Solve BFS grid delivery routing
You are given an m×n grid representing a city: 'S' are DashMart stores, 'H' are homes, '.' are roads, and '#' are obstacles. Movement is allowed in fo...
Design document-tag classes with concurrency safety
Design document-tag classes with concurrency safety System Design: In‑Memory Document–Tag Manager (Single Node) Context You are designing an in-memory...
Pivot data without date libraries
Transform a tall dataset into a wide, pivoted view without using any date/time libraries. Input: a list of records (date, store_id, metric, value) whe...
Implement island counting with BFS and DFS
Question You are given an m x n grid of characters where '1' represents land and '0' represents water. Count the number of distinct islands (connected...
Describe Java 8 features
Describe Java 8 features What are the key new features introduced in Java 8? Explain when and how you would use lambda expressions, the Stream API, Op...
Merge overlapping time intervals efficiently
Given a list of closed intervals [start, end] with 0 <= start <= end, merge all intervals that overlap or touch and return a minimal set of non-overla...