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."
Compute posterior and predictive coin probabilities
Bayesian coin: posterior, prediction, and stopping-time expectation Context - You have two coins and will use the same coin for all flips: - Fair co...
Diagnose and fix linear regression assumption breaks
OLS Assumptions, Diagnostics, Remedies, and Refitting Under Heteroskedasticity and Multicollinearity You are fitting a linear regression with Ordinary...
Decide best email variant using stratified A/B analysis
Stratified A/B Test Across Two Strata (Week/Location) You ran an email A/B test across two strata defined by week/location. Each user receives at most...
Prevent data registration outage and reduce loss
Preventing Silent Failures in the Premium Registration Pipeline Context A premium registration pipeline silently failed for three months, causing thou...
Design rigorous A/B test and causal analysis
Experiment Design and Causal Inference: Multi-part Problem Context: You are designing a high-traffic web A/B test on a binary conversion metric. Answe...
Design theme-park profit model and bid decision
Theme Park Pricing and Land-Acquisition Case Context You manage pricing analytics for a Disney-like theme park. Baseline demand is steady. A land auct...
Build and assess CTR prediction
CTR Prediction with Delayed Feedback and Extreme Class Imbalance You are building a model to predict the probability that an ad impression results in ...
Explain power drivers and resolve unexpected A/B results
A/B Testing: Power, Sample Size, Allocation, and Diagnostics You are analyzing a two-proportion (binary conversion) A/B test with independent users, n...
Use data to resolve an ambiguous problem
Behavioral + Technical: End‑to‑End Data Story (Ambiguous Problem) You are interviewing for a Data Scientist role. Describe an end‑to‑end instance wher...
Explain Changing Priorities and Your Role on a Team
Explain Changing Priorities and Your Role on a Team Describe how you respond when project priorities change and how you characterize the role you usua...
Explain mixed models and fixed vs random effects
In an applied DS setting, you are modeling an outcome (e.g., watch time per session, conversion, or rating) across multiple entities (e.g., users, cre...
Solve core probability and statistics questions
This question evaluates proficiency in core probability and statistical inference—covering Bayes' rule, causal controls in regression, the Central Lim...
Estimate ATE, ITT, and TOT from experiment
This question evaluates a data scientist's competency in causal inference and experimental analysis, specifically the estimation and interpretation of...
Design a Test Orchestration System
Design a test orchestration service for an engineering organization. The service should let users define different kinds of tests, schedule when they ...
Explain Transformers and deploy an LLM safely
Answer the following LLM-focused questions. 1) Transformer basics - What problem does the Transformer architecture solve compared with RNNs? - Explain...
Match people to questions using tags and priorities
This question evaluates competencies in bipartite matching and combinatorial optimization, along with practical data-structure design for scalable tag...
Solve Array Distance and Wiki Navigation
You are given two independent coding tasks. For each task, clarify edge cases, implement the function, and write meaningful test cases. Task 1: Minimu...
Maximize Chef Assignment Profit
You are given three integer arrays: - chefSkill[i]: the skill level of the i-th chef. - dishDifficulty[j]: the difficulty level required to cook the j...
Measure Meeting Coverage and Required Rooms
Measure Meeting Coverage and Required Rooms Given meeting intervals, compute both the total amount of time spent in at least one meeting and the minim...
Quadtree for 2D Geospatial Points
Quadtree for 2D Geospatial Points Design and implement a point quadtree that stores geographic locations on a 2D plane and supports efficient axis-ali...