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."
Design a One-on-One Chat Service
This question evaluates the ability to design a scalable, real-time one-on-one messaging service, probing distributed systems concepts, data modeling,...
Design Global Metrics Monitoring and Real-Time Alerting
Design Global Metrics Monitoring and Real-Time Alerting Design a large-scale monitoring and alerting system for a global microservice architecture. Th...
Implement and Evaluate Pin Similarity in Python
You are asked to compare Pin similarity in Python. Begin by clarifying how a Pin is represented and what “similar” should mean. Then assume the interv...
Defend a Schema Decision Through a Real Technical Challenge
Defend a Schema Decision Through a Real Technical Challenge Choose a system you worked on where the data model materially affected correctness, scalab...
Evaluate AI Workflow Product Metrics
This question evaluates product analytics and experimentation skills—specifically metric definition, funnel construction, segmentation, instrumentatio...
Minimize Array Amplitude After Removing a Contiguous Block
Given an array of integers and an integer K, remove exactly K contiguous elements so that the amplitude of the remaining array, defined as max(remaini...
Navigate a Maze Through a Next-Step API
You are given an API that returns the next location you should visit in a maze. Starting from an initial location, repeatedly call the API until you r...
Scaling a Collision-Free Rover Fleet to a Million Robots
This system design question evaluates a candidate's ability to scale a stateful, invariant-preserving service across distributed machines, using a sha...
Design a Low-Latency Hotel Room Availability System
Design a hotel room availability service for a travel marketplace similar to Expedia. The key requirement is low-latency availability reads. Users sho...
Define Success for a New Group Feature Without Hiding Cannibalization
Prompt A travel-oriented social app is considering a new Groups feature that lets people who do not already know one another form communities around d...
Banking System Simulation
Banking System Simulation You are building an in-memory banking system that is driven by a time-ordered stream of operations. Implement the system so ...
Describe Something New You Learned Recently
Describe Something New You Learned Recently Describe one meaningful thing you learned during the last six months. Explain why you chose it, how you le...
Improve Training With Noisy Annotators
You are given a labeled training dataset as a Pandas DataFrame. Each row contains feature columns, an observed label, and an annotator_id identifying ...
Explain Your Ownership in a Large System
Explain Your Ownership in a Large System Choose a substantial project involving a system built by multiple people or teams. Explain exactly what you o...
Solve probability and game-theory puzzles
You are interviewing for a quant trading internship. Work through the following probability and game-theory puzzles. There is no need to answer instan...
Build a Candidate Search System
This question evaluates the ability to design and implement an end-to-end candidate search system, assessing competencies in information retrieval, ra...
Design a Real-Time Top-K Ranking System
Design an object-oriented, real-time Top-K ranking system. The system continuously receives score updates for a large set of entities — for example us...
Validate order book data across multiple databases
Assume your organization stores order book–related data in multiple databases (e.g., one for raw exchange messages, one for normalized orders, one for...
Implement a Per-IP Sliding Window Rate Limiter
Given sorted request timestamps, matching IP addresses, a request limit, and a time-window length, return an array where 1 means the request is accept...
Answer Behavioral Questions About Deadlines, Feedback, and Ambiguity
Prepare behavioral answers about tight deadlines, critical feedback, ambiguous requirements, and AI-related work experience. `hint Hint 1 Start by sta...