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."
Rotate a 3×3 digit grid by 180°
This question evaluates understanding of grid and string manipulation, coordinate transformations, spatial reasoning, and character validation in cons...
Maximize capacity with primary-backup pairing
This question evaluates combinatorial optimization and constrained matching skills, focusing on algorithm design, complexity analysis, and resource-al...
Design a rolling hit counter API
This question evaluates proficiency with data structures for time-window aggregation and understanding of time/space trade-offs when counting events w...
Minimize total factory cost with distance penalties
This question evaluates dynamic programming and sequence optimization skills, focusing on modeling cumulative build costs with adjacency distance pena...
Verify business accounts with progressive KYC rules
This question evaluates skills in string parsing, text normalization, rule-based validation, and token-based string matching within a KYC verification...
Solve linked list reversal and minima problems
This set of problems evaluates proficiency in fundamental data structures and algorithms, specifically linked list manipulation (reversal and linear-t...
Design a large-scale temperature sensor system
This question evaluates system design and distributed-systems competencies including large-scale data ingestion, time-series storage, real-time visual...
Implement Nested Transactional Key-Value Store
Implement an in-memory key-value store that processes a batch of commands, one command per line. The store must support nested transactions. Supported...
Settle Group Expenses with Transfers
You are given a list of group expense transactions from a trip. Each transaction contains: - payer: the person who paid the full amount. - amount: the...
Check equal character frequencies
This question evaluates a candidate's understanding of character frequency analysis and algorithmic reasoning in string manipulation, measuring the ab...
Find shortest path in an OOP maze
This question evaluates graph traversal and shortest-path reasoning within an object-oriented codebase, focusing on state representation, neighbor exp...
Solve a Three-Roll Optimal Stopping Game
Solve a Three-Roll Optimal Stopping Game A fair six-sided die may be rolled at most three times. After each of the first two rolls, stop and receive t...
Implement a Thread-Safe Pub-Sub Service
Implement a simple server-side publish-subscribe system using Python's standard threading library. Requirements: - Multiple publisher threads may publ...
Implement Caches, Undo, and Traversal
Solve the following coding tasks. For each task, define clean APIs, implement the core logic, and be prepared to explain time and space complexity. Ta...
Implement Concurrent Any-True Shot
This question evaluates proficiency in concurrent programming, focusing on coordination, synchronization, early termination, and best-effort cancellat...
Simulate Plant Infection Spread
This question evaluates graph traversal and grid-based simulation skills, including modeling a 2D grid as a graph, propagation dynamics with obstacles...
How do you tackle unfamiliar problems?
Behavioral questions 1. Project deep dive: Briefly introduce yourself and walk through 1–2 past projects you worked on. Pick one problem you solved th...
Minimize maximum height along a grid path
This question evaluates algorithmic pathfinding and graph-modeling skills, specifically reasoning about grid-based route selection where the objective...
Design a ride-hailing ETA system
This question evaluates competency in applied machine learning and data science, including ETA system and product design, feature and label engineerin...
Derive a CDF from a PDF
This question evaluates a candidate's understanding of the relationship between probability density functions and cumulative distribution functions, i...