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."
Transform and aggregate messy event data
Using pandas (vectorized; no loops), clean, combine, and aggregate the following to produce country/plan day-level metrics for 2025-08-31. DataFrames ...
Design an Online Judge and Live Comments
The onsite included two system design prompts: 1. Design an online judge platform where users submit code for programming problems. The system must su...
Search Words and Phrases in a Large Line-Oriented File
Search Words and Phrases in a Large Line-Oriented File A text file contains one sentence per line and may be much larger than memory. Design an API th...
Compute Company Suggestion Funnels
This question evaluates a candidate's ability to perform event-level funnel analysis including distinct aggregation, joins to a dimension table, time-...
Debug GPU Resource Allocation
This question evaluates debugging and root-cause analysis skills focused on GPU resource allocation, lease management, scoring and preemption policies...
Design distributed message queue service
Design a Distributed Message Queue Service Problem Statement Design a distributed message queue system that supports very high throughput for both pro...
Discuss a Project You Are Proud Of and How You Work
Discuss a Project You Are Proud Of and How You Work Use one concrete project to answer the following questions. Keep your account truthful and make yo...
Design a jigsaw puzzle (OOD)
This question evaluates object-oriented design skills, including class and relationship modeling, state and behavior encapsulation, validation logic, ...
Design street-view image ingestion and storage system
This question evaluates understanding of large-scale system design for media ingestion, covering distributed ingestion pipelines, durable storage and ...
Implement flood fill using BFS and DFS
This question evaluates proficiency in graph traversal and matrix manipulation, specifically the implementation of BFS and DFS variants for flood fill...
Design and backtest a trading strategy
Minute-Level Mean-Reversion Strategy: Design, Backtest, Validation, and Significance Context You are given minute-level OHLCV data (open, high, low, c...
Design Data Aggregation, Query, and One-Time Secret Systems
Design Data Aggregation, Query, and One-Time Secret Systems Address three independent system-design exercises. For each part, establish requirements, ...
Calculate Days Between Arbitrary Gregorian Dates
Calculate the absolute number of days between arbitrary valid Gregorian dates without enumerating each day or relying on a limited date library. Accou...
Explain Why You Are Considering a Job Change
Shape a concise, truthful answer to why you are considering a job change. Connect a durable motivation and one concrete fact from your current experie...
Design a thread-safe event dispatcher
Problem: "Event fire" / event dispatcher with multithreading Design an in-memory event system that supports registering listeners and firing events. C...
Design comment ranking
This question evaluates competency in designing large-scale machine learning ranking systems, testing skills such as candidate generation, label and t...
Implement a Unique Pointer and Vector
This question evaluates understanding of C++ resource management, RAII, ownership and object lifetime semantics, move versus copy semantics, exception...
How would you test product changes?
This question evaluates experimental-design and analytics competencies—specifically A/B testing, causal inference, metric selection, segmentation, pow...
Design cart management lifecycle service
Scenario You are designing the backend for an on-demand delivery app (restaurants and grocery). Users can create a cart, modify items from multiple de...
How to test bike delivery?
You are a data scientist at a food-delivery marketplace. The company is considering launching a bicycle courier delivery option in selected cities. De...