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."
First Word Matching Each Prefix Query
This question evaluates a candidate's grasp of string data structures and efficient prefix-matching techniques, core competencies in coding and algori...
Design a RAG-Based Agent System
This question evaluates a candidate's competency in designing end-to-end Retrieval-Augmented Generation (RAG) systems and LLM-based agents, covering r...
Design a ChatGPT-like conversational assistant
Design a ChatGPT-like conversational assistant product. Assume you need to support: - Multi-turn chat with conversation history - Streaming responses ...
Describe your best team and your role
Question This is a two-part behavioral question. Answer both parts with concrete, specific examples (use STAR where relevant), and connect what you va...
Debug a transformer training pipeline
Debug a Transformer training pipeline You are handed a PyTorch Transformer encoder–decoder training pipeline that misbehaves. The pipeline includes to...
Design a trie-based URL router with wildcards
Design a trie-based URL router with wildcards Implement a URL routing matcher that supports adding route patterns and matching request paths, using a ...
Explain VPCs and private/public network connectivity
What is a VPC (Virtual Private Cloud)? Explain the difference between a private network and a public network/subnet. How do private subnets connect to...
Explain logistic regression vs forests and boosting
Technical Screen — Machine Learning Answer all parts precisely. 1) Binary logistic regression: model, loss, gradient, convexity - Define the model: p(...
Design a network-aware Wi‑Fi badge experiment
You work on a two‑sided travel search marketplace and product wants to add a “High Wi‑Fi” badge/filter in the search bar to help remote workers. Recom...
How would you critique this regression?
Question You are reviewing a modeling workflow built by another data scientist and asked to critique it. Business context A website receives traffic f...
Design an OOD detection system
This question evaluates a candidate's competency in ML system design, specifically out-of-distribution detection, production monitoring, interpretabil...
Debug a Random Dasher Registry
Debug a Random Dasher Registry A registry supports adding dashers and randomly selecting and removing one. It uses a dense array of dasher IDs plus a ...
Diagnose Weekly Session Conversion Anomalies
You are a Data Scientist supporting an e-commerce platform. You receive a weekly time-series dashboard covering the past three years. The dashboard in...
Design an Ad Frequency Capping System
Design a frequency capping system for an advertising platform. A frequency cap limits how many times a user can be shown an ad, campaign, line item, o...
Implement a Recipe Cart
This question evaluates the ability to design and implement stateful data structures and aggregation logic for tracking ingredient counts, applying ti...
How do you align ambiguous cross-functional projects?
This hiring-manager interview was a 45-minute behavioral discussion centered on past project work and communication skills. A candidate should be prep...
Describe your most impactful project
Tell me about the project where you had the most impact. Explain the business or user problem, why it mattered, what your specific role was, the harde...
Describe proudest project and toughest challenge
Behavioral questions 1. Proudest project: Tell me about the project you are most proud of. What was the goal, what did you personally own, and what wa...
How would you present a project deep dive?
You are asked to do a project deep dive (often with a short slide deck). Present one project you worked on and be prepared for detailed follow-ups. Co...
Debug a failing ML classifier
Debugging a Churn Prediction Pipeline With Poor Generalization Context You have inherited a binary churn prediction system. The goal is to predict whe...