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."
Diagnose KPI anomaly and evaluate promotion/A-B test
Diagnose KPI anomaly and evaluate promotion/A-B test You are a Data Scientist supporting a TurboTax product team. You are asked to handle three relate...
Compute Top-K word frequencies under a path
Compute Top-K word frequencies under a path Given a filesystem path that may contain nested subdirectories and files, compute the top K most frequent ...
Diagnose failures via SSH and large logs
Diagnose failures via SSH and large logs Troubleshooting Large Logs Over SSH and Designing Centralized Logging Context You are on-call for a productio...
Build a simplified Wordle game in React
This question evaluates a candidate's competency in React-based front-end development, covering component design, state management, asynchronous HTTP ...
Write SQL for CTR and Revenue
This question evaluates proficiency in SQL-based data manipulation and analytics, focusing on joins across event and reference tables, time-of-day buc...
Assess Spring IoC, AOP, JDBC, Security
Assess Spring IoC, AOP, JDBC, Security Spring Framework — Multi-part Questions Context: You are building/maintaining a Spring-based service for a take...
Design ad clickstream analytics pipeline
Design ad clickstream analytics pipeline Design an end-to-end advertising clickstream ingestion and analytics platform that ingests events through Kaf...
Explain decision trees and tree ensembles
Prompt 1. Explain how a decision tree works for classification or regression. 2. How does the tree choose a split (objective functions for classificat...
Partition a Target String by Source Substrings
This question evaluates understanding of string algorithms and optimal partitioning, specifically substring matching and minimizing the number of cont...
Design trending livestream discovery
Design a system for a live-commerce platform that surfaces trending livestreams to users. Assume an ML model for scoring trendiness or relevance alrea...
Explain deployment, retrieval, and regularization
You are interviewing for a machine-learning role at a large-scale short-video platform. Answer the following conceptual questions. 1. Under tight GPU ...
Compute probability an account is fake
This question evaluates understanding of conditional probability and Bayesian reasoning, specifically interpreting base rates alongside true positive ...
Compute and plot a precision–recall curve
Precision–Recall (PR) curve coding / evaluation You are given a binary classifier’s outputs on a dataset: - y_true: array of true labels in \(\{0,1\}\...
Design and evaluate a fraud detection strategy
This question evaluates fraud domain knowledge, quantitative model evaluation, metrics and diagnostic design, operational strategy formulation, segmen...
Design marketplace experiments at DoorDash
You are interviewing for a product data role at DoorDash. Consider the following marketplace scenarios. 1. Top Dasher program DoorDash runs a status...
Check if all substrings are dictionary words
You are given a string s (letters only) and access to an English dictionary dict (a set of valid words). Return true if every contiguous substring of ...
Compress editor keystrokes into insert/delete/skip
You are implementing a simplified collaborative editor sync format. You are given: - An initial document string doc. - A list of user input operations...
Find shortest path on infinite grid
You are given an infinite 2D grid with integer coordinates. From a cell (x, y) you may move in 4 directions (North/South/East/West) by 1 cell per move...
How would you target promotions to grow consumers?
ML / Growth Scenario You own a system that sends promotion offers (e.g., "$10 off", "free delivery") to consumers to increase growth. Prompt Design an...
Fill missing values with means
You are given a pandas DataFrame df with missing values in multiple numeric columns. Write a concise pandas expression to replace NaNs in each numeric...