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 Architecture and Capacity Trade-offs
This multi-part question evaluates system architecture trade-offs, capacity and storage planning, security-aware component design, and document dedupl...
Compute DAU and rolling MAU with zero days
You have two tables in PostgreSQL: Tables users - user_id (STRING / INT, PK) - signup_date (DATE) logins - user_id (STRING / INT, FK → users.user_id) ...
Implement a sliding-window rate limiter
Problem Design and implement an in-memory rate limiter using a sliding time window. You are given a stream of requests. Each request has: - key (e.g.,...
What features and feature selection would you use?
Context You are building an ML system to rank/promote shop ads in an e-commerce feed/search page. At serving time, the system may score candidate shop...
Handling an Ambiguous "Family Tree" Prompt
Behavioral/Leadership: Handling an Ambiguous "Family Tree" Prompt Context: In a technical screen, the interviewer says only "there is a family tree" a...
Describe a project and ask questions
Describe a project and ask questions Behavioral: Walk Through a Recent Project End-to-End (Software Engineer — Technical Screen) Provide a concise, st...
Implement XML tokenizer and parser with operations
Implement XML tokenizer and parser with operations You are given either (a) a raw XML-like string such as <catalog><book><author>Gambardella, Matthew<...
Describe building statistical vs ML models
You’re interviewing for a Data Scientist internship on a marketing analytics team. Tell a story about a project where you built (a) a statistical mode...
Array vs. Linked List: Differences and When to Use Each
In a technical screening round, the interviewer asks: What are the differences between an array and a linked list? When would you choose one over the ...
Explain portfolio, design language, and delivery
Explain portfolio, design language, and delivery Prompt: Portfolio Walkthrough, Design Language, and Landing Under Constraints Context You are intervi...
Design limited-time donation platform
Design limited-time donation platform System Design: Donations Platform for a Three-Day Global Fundraising Campaign Context You are to design an inter...
Count Referral Descendants
You are building a referral analytics feature. Each referral relationship is represented as a directed pair (referrer, referredUser), meaning referrer...
Implement merge sort and largest 1-rectangle
The coding round included two algorithm questions: 1. Implement merge sort for an array of integers. Return the sorted array and explain its time and ...
Implement in-memory KV store with serialization
Implement an in-memory key-value store in Python that supports setting and retrieving values and can serialize and deserialize the entire store. Defin...
Design LLM-enhanced recommendation solutions
Design LLM-enhanced recommendation solutions System Design: Incorporating Large Language Models (LLMs) into a Large-Scale Recommendation System Contex...
Share examples of impact and simplicity
Share examples of impact and simplicity Behavioral prompt: Exceeding customer expectations and simplifying complex problems Context You are in a softw...
Explain AtomicInteger and ABA problem
Explain AtomicInteger and ABA problem How does AtomicInteger implement atomic updates (e.g., via CAS using Unsafe or VarHandles)? What is the ABA prob...
Group a tree by vertical columns
Group a tree by vertical columns Given the root of a binary tree, produce a vertical listing of nodes: assign each node an x-coordinate (root at x=0; ...
Debug round-robin, DashMap, and simple cache
You are given a service that routes requests to a list of nodes, each marked as either available or unavailable. The pickNode() function is intended t...
Assess cooldown and plan interview strategy
Assess cooldown and plan interview strategy Interpreting a One-Year Interview Cooldown and Maximizing Signal in a Three-Part Onsite Context You are pr...