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."
Find numbers with exactly two sum-of-squares forms
This question evaluates understanding of integer representations as sums of two squares and the ability to reason about counting distinct unordered re...
Answer ambiguity and PM disagreement behavioral questions
Behavioral questions 1) Describe a time you worked on a problem with high ambiguity (unclear goals, incomplete data, shifting requirements). What did ...
Diagnose metric anomalies and evaluate new algorithm
This question evaluates competency in analytics-driven incident investigation, experiment design, metric instrumentation, and product-metric interpret...
Build a time-based key-value store
Problem Design a data structure that stores multiple values for the same key at different timestamps, and can retrieve the most recent value as of a g...
Implement a Tic-Tac-Toe game class
Problem Implement a class that supports playing an n × n Tic-Tac-Toe game. Requirements Create a class TicTacToe(n) with: - move(row, col, player) -> ...
Remove shortest subarray to sort array
Given an integer array nums (length up to 2×10^5), return the shortest subarray [L,R] you can remove so that the remaining elements form a non‑decreas...
Validate in-post restaurant recommendations via experiment
This question evaluates a data scientist's competency in experimental design for recommendation systems, including defining viewer- and creator-level ...
Design a robust traffic forecasting pipeline
This question evaluates a candidate's competency in end-to-end time-series forecasting pipeline design, covering data cleaning and missing-value handl...
Optimize invites under capacity constraints
You have n donors (n up to 100,000). For each donor i you know: p_online[i] (probability of donating if emailed), a_online[i] (expected donation condi...
Build and evaluate donation propensity model
You need a model to maximize expected net revenue from solicitations. Costs: online reach costs $1 per person; gala attendance costs $100 per attendee...
Describe your proudest accomplishment and impact
What is the most meaningful accomplishment in your recent role? Detail: a) the baseline and measurable target; b) constraints and risks; c) your uniqu...
Write SQL to compare social-only vs game-only engagement
You are given two tables capturing Oculus app usage. Define an 'active day' as a UTC date on which a user generates at least one event. Consider only ...
Estimate Portal’s causal lift on video-call usage
This question evaluates applied causal inference and statistical analysis skills, including defining estimands, designing staggered-adoption differenc...
Design offline segments for Meta Portal retail
Meta Portal is a plug‑in home video‑calling device sold via offline retail. Target segments are not finalized. You have historical, anonymized Faceboo...
Compute sample size and test duration
You will run a two-arm A/B test on a signup funnel. Given: baseline conversion p0 = 4.0%; you care about detecting a 10% relative uplift (p1 = 4.4%); ...
Assess 3.4M target and design experiments
This question evaluates skills in growth analytics, market sizing (TAM→SAM→SOM), funnel modeling, unit economics (CAC/LTV), capacity planning, and exp...
Reconcile ledgers with SQL/Python and late events
You own a daily ETL + reconciliation job between two financial ledgers. Late postings (“delay time”) up to 48 hours are common. Schema: - payments_raw...
Evaluate and prioritize Facebook Groups
This question evaluates product analytics, experimentation design, causal inference, KPI hierarchy and metric-definition skills, and quantitative prio...
Define and query shop visibility
You are given the following schema. Use only the columns provided; do not introduce new fields or labels. Tables and columns: - shops(shop_id INT, sho...
Describe handling an urgent ad-hoc request
Behavioral Prompt: Urgent, Unscheduled Analytics Request (STAR) You are interviewing for a Data Scientist role and are asked to provide a STAR-formatt...