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."
When prioritize precision vs recall
Context You are working on a product team and building (or evaluating) a binary classifier that triggers an action (e.g., show a warning, block conten...
Design a Scalable Post, Feed, and Search Service
Design a Scalable Post, Feed, and Search Service Design a social-post service with three core capabilities: a user can publish a text post, retrieve a...
Resolve a cd Path Against the Current Directory
Resolve a cd Path Against the Current Directory Implement path resolution for a simplified Unix-like cd command. cwd is a normalized absolute path. ar...
Implement Parallel Image Processing
Build an image-processing utility in Python using the Pillow library. You are given a collection of image file paths and an output directory. For each...
Solve palindrome and list tasks
This question evaluates proficiency in string algorithms and linked list manipulation, specifically techniques for constructing the shortest palindrom...
Design pickup point planning for ride-hailing
Design an algorithm and high-level system for recommending a pickup point in a ride-hailing app. A passenger requests a ride from an approximate city ...
Describe Linux and SQL experience
You are being assessed on basic tooling skills as an engineer. Answer: 1. Linux/Unix commands: list commands you are comfortable with and briefly expl...
Update Box Probabilities After Drawing Red Balls
Three boxes are equally likely to be selected: - Box A contains two red balls. - Box B contains one red and one blue ball. - Box C contains two blue b...
Derive the Long-Run Sex Ratio Under a Stopping Rule
Assume each child is independently equally likely to be a girl or a boy. Every family continues having children until its first boy, then stops. For a...
Compute Moderation View Metrics
Question You are working on a content moderation analytics problem. You have two tables. Table 1: content_views (one row per user / post / day) - user...
Explain Python tuples and typical usage
You are asked some Python fundamentals. 1. What is a tuple in Python? Describe its key properties (e.g., ordering, mutability, hashability). 2. How do...
Evaluate AI-assisted ad creation
This question evaluates a candidate's competence in product analytics, causal inference, experimentation design, metric definition, and monitoring for...
Explain Chunking for Financial RAG
Suppose you are building a retrieval-augmented generation (RAG) assistant over long financial research reports, filings, and policy documents. Explain...
Compute days until plants stop dying
You are given a row of plants, each with an integer pesticide level. Rules - On each day, any plant with a strictly greater pesticide level than the p...
Check whether brackets are balanced
This question evaluates a candidate's competency in string processing and bracket-matching concepts, testing familiarity with linear-time algorithms a...
Solve sliding-window and disjoint-string-pairs tasks
This question evaluates proficiency in string-processing algorithms, sliding-window techniques, efficient set or bitmask representations, and combinat...
Validate whether a given sequence is a Hamiltonian path
You are given strArr, an array of three strings describing an undirected graph and a proposed vertex visit order: 1. strArr[0]: a comma-separated list...
Find the third-largest word by length
Given an array of strings strArr (length ≥ 3), return the third largest word when ranking words by string length in descending order. Ranking rules: -...
Compute discounted prices and full-price indices
You are given an array prices of length \(n\). Items are sold from left to right, and each item’s final selling price is computed as follows: For item...
Find all balanced k in a permutation
You are given a permutation \(p\) of length \(n\) containing each integer from \(1\) to \(n\) exactly once. For each \(k\) where \(1 \le k \le n\), de...