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."
Generate Available 30-Minute Time Slots
This question evaluates date/time arithmetic, interval and recurrence handling, edge-case reasoning, and test-case design within scheduling logic for ...
Parse Requests and Compute Balances
This question evaluates input parsing, state management, data validation, and use of basic data structures to track user accounts, friend relationship...
Design a multi-channel notification system
Design a notification system that receives alert events from other internal systems and notifies all subscribed users through multiple channels (e.g.,...
Find minimum time to cross bridge with flashlight
This question evaluates algorithmic problem-solving and optimization skills, including modeling constrained state transitions, reasoning about trade-o...
Find smallest common organization for employees
The question evaluates competency in hierarchical and graph data structures, including tree lowest-common-ancestor reasoning, DAG ancestor minimality,...
Maintain median of a data stream
Design a data structure that supports: - addNum(int x): Add an integer from a stream. - findMedian(): Return the median of all inserted numbers so far...
Implement Three Research Coding Tasks
This multi-part question evaluates skills in differentiable linear algebra and automatic differentiation safety, memory- and buffer-aware numerical im...
Implement and Tune KNN Classifier
You are given two CSV files for a three-class leaf-classification task. - train.csv contains three numeric feature columns: feature_0, feature_1, and ...
Design a collaborative spreadsheet backend
Design a web-based spreadsheet service similar to Google Sheets, with emphasis on backend architecture and data models. Focus areas: - Multiple users ...
Calculate Pirated Usage and Revenue Loss
You are analyzing theme piracy on an e-commerce platform. Assume the analysis window is 2023-01-01 through 2023-12-31, all timestamps are stored in UT...
Support room moves and query top-k fastest
This question evaluates understanding of dynamic data structure design and ordering semantics, specifically maintaining per-room FIFO arrival order, c...
Implement trie-based autocomplete
This question evaluates understanding and implementation of trie data structures for prefix-based retrieval, testing competencies in string algorithms...
Compute reply-based engagement metrics
You work on a microblogging app (Twitter-like). Posts and replies are stored in the tables below. Tables all_post - post_id BIGINT PK - post_author_id...
How to measure product success?
You are asked to evaluate whether a product or newly launched feature is successful. Describe how you would define success from a data science and pro...
Implement CSAT tracking and call timing
This question evaluates skills in designing efficient streaming/rolling-window data structures and stateful updates for real-time metrics, alongside p...
Find max node-value range across components
This question evaluates understanding of undirected graph connectivity and component-wise aggregation, specifically the ability to identify connected ...
Compute distance to nearest taxi in grid
This question evaluates understanding of graph traversal and shortest-path reasoning on grids, algorithmic problem-solving for computing distances fro...
Compute infection spread time
This question evaluates understanding of grid-based graph traversal and propagation dynamics, testing competencies in breadth-first search concepts, s...
Find longest substring with ≥k repeats
This question evaluates proficiency with string-processing techniques and character frequency analysis, focusing on algorithmic skills in the Coding &...
Design a Ticketmaster-like ticketing system
This question evaluates a candidate's competency in designing scalable, consistent online ticketing platforms, testing knowledge of distributed system...