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 enterprise RAG search system
Design enterprise RAG search system Design an End-to-End Enterprise RAG Search System Background You are tasked with designing a Retrieval-Augmented G...
Implement CIDR firewall matcher
Implement CIDR firewall matcher Firewall Rule Matcher for IPv4 CIDR Rules Context and Assumptions You are to design and implement a firewall rule matc...
Design a Cryptocurrency Trading System with Third-Party Exchanges
Design a Cryptocurrency Trading System with Third-Party Exchanges Design a cryptocurrency trading platform that routes client orders to one or more th...
Calculate Sample Size for Effective A/B Test Design
Calculate Sample Size for Effective A/B Test Design A/B Test Planning: Sample Size and Power Scenario You are planning an online A/B test to evaluate ...
Influence Stakeholders Without Authority: Strategies and Examples
Influence Stakeholders Without Authority: Strategies and Examples Behavioral Interview (Onsite) — Data Scientist at PayPal Prompt You are in a hiring‑...
Design Harmful Content Detection
This question evaluates a candidate's ability to design scalable, robust machine learning systems for multimodal content moderation, encompassing comp...
Implement Gradient Descent Regression
This question evaluates understanding of linear regression and gradient-based optimization, including loss formulation, gradient derivation, parameter...
Design a Scalable Post, Feed, and Search Service
Design a Scalable Post, Feed, and Search Service Design a social-post service with three core capabilities: a user can publish a text post, retrieve a...
Merge Three Sorted Arrays Without Duplicates
Merge Three Sorted Arrays Without Duplicates You are given three integer arrays sorted in nondecreasing order. Merge them into one sorted array that c...
Find Duplicate Files
Implement a file deduplication tool. You are given a root directory containing many files. Return groups of duplicate files. Two files are duplicates ...
Implement A* Maze Search
Implement maze pathfinding in C++. You are given an m x n grid where '.' is an open cell, '#' is a wall, S is the start, and T is the target. You may ...
Evaluate Alternative Data for an Investment Pitch
You are given an alternative dataset and asked to develop an investment pitch. Describe how you would determine whether the data contains a real, usab...
Design a metrics platform without alerting
This question evaluates a candidate's ability to design a scalable time-series metrics platform, covering data modeling for counters/gauges/histograms...
Design an image detection system
System Design: End-to-End Image Object-Detection Service Context Design a production-grade service that ingests user-uploaded images, runs object dete...
Find next terms in sequences
Pattern Recognition: Find the Rule and Next Term You are given 8 number sequences. For each sequence: - Identify a clear rule that generates the terms...
Describe handling intense time pressure
Behavioral & Leadership (Onsite): Thriving Under Time Pressure and Multitasking Prompt Tell me about a time you had to deliver high‑quality work under...
List regularization methods and trade-offs
Question: Compare Regularization Techniques and When to Use Them Context: You are interviewing for a machine learning engineering role and are asked t...
Explain modeling challenges and fixes
Model Development Challenges: Detection, Alternatives, Solution, Evidence Context: In a technical screen for a Machine Learning Engineer, you are aske...
Design a reaction-factor prediction system
End-to-End System Design: Predicting a Reaction Factor from Molecule Pairs Context and goal - You have a tabular dataset with columns: - molecule1_n...
Design a harmful content detection system
Design a Harmful Content Detection System (Multilingual, Multimodal) Problem Statement You are designing a trust-and-safety system for a large, mobile...