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 a global restaurant menu update system
Design a menu update system for a global chain of restaurants. Context: - The chain operates in many countries. - Each restaurant may have multiple ki...
Implement and analyze custom attention
Implement Scaled Dot-Product Attention in PyTorch (from scratch) Context You will implement a numerically stable, vectorized scaled dot-product attent...
Design rental watchlist and notification system
Design a Rental Listing Watchlist and Availability-Notification System You are designing a feature for a vacation-rental marketplace (Airbnb-style). A...
Analyze time complexity for dictionary operations
Analyze the time complexity of the following dictionary/hash map operations. (a) Searching for a key: state average-case and worst-case time, and expl...
Design async batched key-value fetcher
Design an async, batched key-value fetcher with a 100 ms window Context You have a single-threaded, event-loop environment (e.g., JS/TS). A backend en...
Design and operate a monolith on Kubernetes
Design and Operate a Monolith on Kubernetes Context You are joining an infrastructure team. The backend is a single monolithic service. The company is...
Design an Airbnb wallet with holds and payouts
Design and Implement an Airbnb-Style Wallet (Ledger, Holds, FX, Idempotency) Problem Design and implement an Airbnb-style wallet system. This is an OO...
Design a job scheduler
Design a Scalable Distributed Job Scheduler Context Design a multi-tenant, horizontally scalable job scheduler for backend services. The system must p...
Design a swipeable video feed backend
Design the backend service for a short-video product similar to a “Spotlight”-style feed. Scope: only the backend “feed vending” functionality that po...
Linux Host and Filesystem Fundamentals
Linux Host and Filesystem Fundamentals Clarifying Questions to Ask - Which Linux distribution and shell should be assumed? - Are privileged commands a...
Should We Launch Group Calling?
Question You work on a consumer calling product (think Messenger/WhatsApp-style voice) that currently supports only one-to-one voice calls. The team i...
Design Podcast Recap Generation
Design a production system that generates short podcast recaps for newly published episodes. Assume the system should ingest episode audio and metadat...
Implement n-gram model and select n
Implement n-gram model and select n Task: Implement an n-gram Language Model with Training, Sampling, and Model Selection Guidance Objective Implement...
How would you investigate a metric decline?
Scenario You are a Data Scientist supporting a consumer marketplace product. A key business metric (e.g., orders/day, conversion rate, revenue, profit...
Design an n x n Tic-Tac-Toe Game
This question evaluates a candidate's ability to design a class-based data structure that tracks game state and efficiently detects a win condition af...
Design a Multi-Agent Chat Backend
Design the backend for an LLM-powered chat product used by customers in a financial-technology setting. The interviewer will show a simple demo of a c...
Design Ordered CUDA Reduction
In CUDA, a parallel reduction can produce different results if the combination order is not fixed, especially for floating-point arithmetic where addi...
How to measure harmful-content severity and run experiments
Question You are a Data Scientist working on content integrity / harmful content at a large social media platform (e.g., hate/harassment, self-harm, g...
Design restaurant shift scheduling
This question evaluates skills in data modeling, backend system architecture, API design, scalability engineering, and consistency management for a mu...
Evaluate TPR/FPR, sigmoid, and activations
You have a 70-minute assessment with several ML-fundamentals multiple-choice questions. Answer the following (show calculations where applicable). 1) ...