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 Connect-Four-like board game
Design an object-oriented model for a turn-based, grid-based “drop token” board game similar to Connect Four. Game rules (define these precisely in yo...
Explain CSS specificity and selector precedence
This question evaluates a candidate's understanding of CSS specificity and selector precedence, focusing on how the browser prioritizes competing styl...
Find Largest Adjacent Sorted Difference
Given an unsorted array of integers nums, compute the largest difference between two consecutive elements after the array is sorted in ascending order...
Implement a Hierarchical File System
Implement an in-memory hierarchical file system. Create a class FileSystem with the following methods: - FileSystem() initializes an empty file system...
Represent k-means as an MLP
This question evaluates understanding of how the nearest-centroid step of k-means can be expressed as a fully connected neural network layer with acti...
Implement one-cluster k-means
This question evaluates understanding of clustering algorithms and optimization of within-cluster squared error for the special case k = 1, along with...
Implement an LRU Cache
This question evaluates competency in designing efficient stateful data structures, understanding cache eviction policies (least recently used), and m...
Support Dynamic Range Sums
Implement a data structure over an integer array nums. Part 1: If the array never changes, support sumRange(left, right) that returns the sum of eleme...
Design Experiments for Email Campaign & Messaging Update
Experiment Design for Concurrent Email Campaign and Messaging Feature Marketing will run an email campaign at the same time Product ships a new in-pro...
Identify Sales Professionals
Classifying Sales Professionals on LinkedIn You are building a machine-learning system that automatically classifies LinkedIn members who are likely t...
Design A/B Test for Subscription Price Increase Effectiveness
A/B Testing a Subscription Price Increase and Sign-up CTA A B2B SaaS company is considering two experiments: raising subscription prices and improving...
Resolve Conflicting A/B Test Results in Cities
A/B Test Paradox Across Two Cities You ran an A/B test in two geographies, City X and City Y. Within each city, variant A outperforms variant B. Howev...
Adjust YouTube Ad Scores Using Mixed-Effects Linear Regression
Adjusting YouTube Ad Scores with Mixed-effects Regression One hundred reviewers each rate the same 100 YouTube ads on a 1 to 10 scale. Some reviewers ...
Evaluate College Impact on Income: Address Bias and Validity
Evaluating College Impact on Income with Observational Data You have an observational, cross-sectional dataset of 1,000 adult Mountain View residents....
Generate Samples from Truncated Normal Distribution
Sampling from a Truncated Normal Distribution You draw from a normal distribution but only keep observations that are at least 1. Assume the original ...
Determine Probability of Both Children Being Boys
Conditional Probability: Two Children A family has two children. You learn that at least one of them is a boy. Answer the questions below and state yo...
Assess Candidate's Alignment with Amazon Leadership Principles
Behavioral Interview: Amazon Leadership Principles for Data Scientists You are interviewing for a Data Scientist role where customer impact, ownership...
Align Conflicting Stakeholders for Successful Project Delivery
Behavioral Interview: Aligning Conflicting Stakeholders Cross-functional projects often require coordination between data scientists, engineers, produ...
Assess Success Criteria for Bike-Courier Delivery Launch
Assessing a Bike-Courier Delivery Launch DoorDash plans to launch a bike-courier delivery option and wants to assess whether, where, and how to roll i...
Influence Decisions Without Direct Authority: Strategies and Outcomes
Influence Decisions Without Direct Authority This behavioral prompt asks about influencing cross-functional decisions without formal authority in a da...