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 API that aggregates three downstream APIs
You are given three existing HTTP JSON APIs owned by other backend services: - Service A: GET /service-a?user_id={id} → returns basic user profile dat...
Compute expected coin flips to meet on octagon
Compute expected coin flips to meet on octagon Meeting Time on a Random Walk Around an Octagon Problem Two independent particles start at opposite ver...
Demonstrate culture fit and deep dives
Demonstrate culture fit and deep dives Behavioral & Leadership Onsite: Culture Fit and Project Deep Dive (Software Engineer) Context You will be asses...
Design flight-price search service
Design flight-price search service System Design: Cheapest Flight Search Across Multiple Providers Context Design a backend system that searches multi...
Design a Retrieval-Augmented Generation (RAG) system
This question evaluates a candidate's ability to design production-grade Retrieval-Augmented Generation systems, testing competencies in information r...
Build an Auth0-protected MCP server
Hands-on OA: Build an MCP server secured by Auth0 JWTs You are asked to build a local HTTP service that implements a minimal MCP (Model Context Protoc...
Answer leadership scenarios with STAR
Answer the following behavioral questions with specific examples from your experience: 1. How did you challenge the status quo? 2. Describe a time you...
Test whether two user populations differ
Problem You are given two groups of users: - Group A: North America users - Group B: Europe users Each user has a vector of continuous features (e.g.,...
Find k-th recipient in command propagation order
Chain of Command (k-th Receiver in DFS-by-Child-Id Order) A company org chart forms a rooted tree with n people (nodes), labeled 1..n. You are given a...
Measure YouTube Ad Effectiveness
Uber is running marketing ads on YouTube and wants to understand whether the campaign creates incremental business value, not just whether users watch...
Design a scalable metrics monitoring system
Design a scalable metrics monitoring system Design a Metrics Monitoring System for Large-Scale Services Context You are designing a metrics monitoring...
Write the logistic regression loss function
Write the logistic regression loss function Logistic Regression Loss Consider binary logistic regression. - Dataset: \(\{(\mathbf{x}_i, y_i)\}_{i=1}^n...
Implement a simple service with tests
Implement a simple service with tests You're given a short written specification for a small service class (no external dependencies). Implement the c...
Find the Minimum in a Rotated Sorted Array
Find the Minimum in a Rotated Sorted Array A strictly increasing array of distinct integers has been rotated at an unknown pivot. Return its minimum v...
Maximum Profit with Unlimited Stock Transactions
Maximum Profit with Unlimited Stock Transactions Given daily stock prices, compute the maximum profit from any number of buy-and-sell transactions. Yo...
Design an LLM Log Parsing Workflow
Design a production workflow that uses an LLM, optionally combined with deterministic parsers, to convert heterogeneous raw log messages into structur...
How do you discuss mistakes and trade-offs?
Be prepared for both of the following prompts: 1. Tell me about a major mistake you made as a software engineer. Explain the situation, the impact,...
Explain your biggest project with trade-offs
Behavioral interview (Amazon-style). 1) Pick the biggest/most impactful project you worked on. Explain the problem, your role, the technical design, a...
Simulate Monster Team Battles
This question evaluates a candidate's ability to model stateful simulations and implement deterministic battle mechanics with clean data structures an...
Count Connected Components in an Undirected Graph
This question evaluates understanding of graph connectivity and cycle detection, measuring competency in reasoning about connected components and the ...