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."
Explain and test completion-rate gaps
In a food delivery marketplace, alcohol-related orders have a lower order completion rate than non-alcohol orders. Answer the following: 1. Propose se...
Explain overfitting, underfitting, and regularization
This question evaluates understanding of model generalization, overfitting versus underfitting, the bias–variance tradeoff, and regularization techniq...
Process Sharded Login Logs
This question evaluates understanding of distributed systems, stream processing, and reliable data engineering concepts related to ingestion, ordering...
Design a Food Review Platform
Design a Food Review Platform Design a platform where users discover food businesses, read reviews, and submit ratings and review text. Clarify whethe...
Answer hiring manager behavioral questions
Hiring manager round: behavioral questions Prepare structured answers to the following questions (with likely follow-ups). Use concrete examples from ...
Design a fraud detection system
This question evaluates a candidate's competency in designing end-to-end fraud detection machine learning systems, covering real-time and batch featur...
Defend the Complexity and Scalability of a Project
Defend the Complexity and Scalability of a Project Prepare a project deep dive in which the interviewer repeatedly challenges what was technically dif...
Count Complete Tic-Tac-Toe Game Sequences
Count Complete Tic-Tac-Toe Game Sequences Two players play on a standard 3 x 3 board. X moves first and the players alternate. A game ends immediately...
Maximum Path Sum in an Indexed Binary Tree
Maximum Path Sum in an Indexed Binary Tree A nonempty binary tree is represented without custom node objects. values[i] is the value of node i. childr...
Estimate ads ranking revenue impact
You are the data scientist for an ads ranking team at a large social platform. The team has built a new ranking algorithm for feed ads. The new model ...
Evaluate Promotions for Uber Eats Users
This question evaluates a data scientist's causal inference and experimentation competencies—including randomized trial design, treatment-effect estim...
How did you handle an ethical issue?
Describe a time when you encountered an ethical issue at work. What was the situation, why was it ethically sensitive, what options did you consider, ...
Design a Photo Management Service
Design a photo management system where users can upload photos, view them later, and organize them into albums. The system should support creating alb...
Optimize least-k revenue queries for read/write load
Follow-up Scenario Now assume revenue is not provided as a flat list of events, but may be nested, for example: - Each customer has many orders, and e...
Implement a Stoppable Producer–Consumer System in C++
Implement a Stoppable Producer–Consumer System in C++ Design and explain a C++ implementation with three classes: Storage, Factory, and Consumer. Cons...
Applied Machine Learning Assessment: Metrics, Evaluation, and NLP Fundamentals
Reason through an applied machine-learning assessment covering annotation agreement, model metrics, reproducibility, NLP basics, ranking metrics, and ...
How to prepare for a PM partnership round
You’re told an onsite loop has 4 rounds: 2 coding, 1 system design, and 1 “PM partnership” round. Question 1. How is a “PM partnership” interview diff...
Design a KV store with QPS API
This question evaluates a candidate's ability to design scalable, highly available key-value storage systems and to integrate real-time metrics report...
Correct length-biased sampling from family-size survey
In a town, you visit a school and ask 100 kids: “How many children are in your family?” You observe: - 50 kids say their family has 1 child - 20 kids ...
Design a key-value store
System Design: Durable Key–Value Store Design a single-node, embeddable key–value store library with a simple API that must remain correct and durable...