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 large video upload for a YouTube-like app
System Design Prompt Design the video upload subsystem for a YouTube-like product that supports large video files. Core user flow 1. User selects a la...
Answer Behavioral Questions
Behavioral Interview (Software Engineer, Technical Screen) Context: Prepare concise STAR(L) stories (Situation, Task, Action, Result, Learnings) that ...
Design in-memory database API
Design an In-Memory Database: Insert, Query, and Indexing Design and implement a minimal, single-process, in-memory database intended to be embedded i...
Design a Support Ticket Processing System
Design a support ticket processing system similar to ServiceNow. `hint Hint 1 Start by stating assumptions, then work from requirements to trade-offs ...
Build a React team builder with role constraints
This question evaluates frontend React skills including component state management, enforcing role-based constraints and invariants, handling user int...
Implement a search autocomplete suggestion service
This question evaluates proficiency in designing efficient prefix-matching and ranking mechanisms, including management of incremental query state and...
Design a URL shortening service
This question evaluates systems design skills including scalable architecture, data modeling, low-latency routing, availability, and operational conce...
Implement Review Content Moderation
This question evaluates a candidate's ability to implement consistent server-side content moderation and stateful persistence handling in a backend se...
Design a Secure Medical Audio Pipeline
This question evaluates a candidate's competency in designing secure, compliant, and scalable backend systems for handling sensitive medical audio dat...
Design task scheduler with dependencies
Design a Distributed Task Scheduling Infrastructure Context Design a distributed task scheduling and orchestration system that can run at scale, suppo...
Design a Google Photos–like service
System Design: Google Photos–like Service (Web + Mobile) Context Design a large-scale consumer media service that ingests, stores, indexes, and serves...
Implement tap-to-infect color grid on iOS
iOS Grid Infection (Flood Fill) Design Goal Build an iOS app that displays a 2D grid with two colors. When the user taps a cell, all 4-directionally a...
Implement tail N lines
Question Implement a utility tail(path: string, N: int) (and an equivalent stream variant) that prints the last N lines of input without loading the w...
Solve three algorithmic tasks in Python
You are given 120 minutes to implement three independent algorithmic tasks in Python. Each task specifies the required input/output behavior, the cons...
Compute the Probability for Two Uniform Variables
Let \(X\) and \(Y\) be independent random variables, each uniformly distributed on \([0,1]\). Define: - \(L = \max(X,Y)\) - \(S = \min(X,Y)\) What is ...
Design a chatbot (system design)
Question Design an AI chatbot system with a front-end focus, under the following hard constraints: 1. User messages and conversation history are store...
Implement custom iterator classes
Implement custom iterator classes In a blank coding environment (no IDE assistance, no autocomplete), implement an iterator abstraction entirely from ...
Implement spreadsheet undo/redo operations
Problem Design a data structure that simulates Undo/Redo for a simplified spreadsheet editor. A user performs a sequence of operations on cells. Each ...
Calculate Precision, Recall, and F1
Question You are given a list of binary classification outputs, where class 1 is the positive class. Each record contains: - actual (INT, 0 or 1) - pr...
Design DoorDash Marketplace Experiments
This question evaluates a data scientist's competency in experiment and quasi-experiment design, causal inference, metric definition, and judgment abo...