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."
Describe difficult project, conflict, and PM collaboration
Behavioral round (15 minutes) Answer the following prompts using concrete examples from your experience. 1. Most difficult project - Describe the m...
Calculate Precision, Recall, and F1
Question You are given a list of binary classification outputs, where class 1 is the positive class. Each record contains: - actual (INT, 0 or 1) - pr...
Design a Real-Time Online Chess Platform
Design the backend for a globally distributed real-time chess platform supporting moves, spectators, clocks, reconnects, and failover. Define authorit...
Analyze Pirated Theme Usage
This question evaluates competency in temporal data manipulation, interval-overlap logic, aggregations and joins to calculate monthly usage metrics an...
Present a project deep dive
Behavioral: End-to-End Project Deep Dive (Concise Slide Deck) In the project deep-dive round, the interviewer asks you to present one significant proj...
Design a Streaming Percentile Estimator
Design a Streaming Percentile Estimator The source reports a percentile-estimation discussion that escalated to a plus-or-minus error guarantee and a ...
Merge Message Context Windows
This question evaluates a candidate's skill in designing efficient algorithms and appropriate data-structure use for merging overlapping message conte...
Design Pricing Model Experiment
You work as a data scientist for a ride-hailing marketplace. The company wants to launch a new pricing model that may change the price shown to riders...
Implement Naive Bayes classifier from scratch
Implement a Naive Bayes classifier from scratch (you may use NumPy). Write a class with: - fit(X, y): estimate class priors and feature likelihood par...
Design IDE Sandbox and Payments
You are asked to discuss two system design prompts. For each one, define the users, functional requirements, non-functional requirements, APIs, core w...
How Would You Optimize a Program
You are given an existing program that produces correct results but is too slow in production. Describe a structured plan to optimize it. Your answer ...
Explain Responsible AI Adoption on an Engineering Team
Explain Responsible AI Adoption on an Engineering Team Discuss how you use AI tools in your own engineering work, how you would help a team adopt them...
Design large-scale near-duplicate video detection
This question evaluates a Machine Learning Engineer's competency in scalable similarity search and representation learning for multimedia, including e...
Reverse a Singly Linked List
Reverse a finite singly linked list represented by nested two-item Python lists. Reuse the existing node objects without allocating replacements, and ...
Design a banking system with payments and merging
This question evaluates competency in large-scale system design for financial backends, covering distributed transactions, consistency and idempotency...
Return Top K Open Businesses
This question evaluates a candidate's ability to perform filtering and multi-criteria ranking, requiring correct handling of an open-status filter and...
Scale Ingredient Quantities
Scale Ingredient Quantities Each ingredient is a string in the exact format "<quantity> <unit> <name>". Multiply every quantity by servings and return...
Implement a Half-Open Interval Range Module
Implement a Half-Open Interval Range Module Implement a module that tracks subsets of the real-number line using half-open intervals [left, right). Pr...
Compare NLP tokenization and LLM recommendations
This question evaluates a candidate's understanding of NLP tokenization approaches and the ability to design LLM-based recommendation components, asse...
Answer common project leadership questions
Prepare concise, structured answers for a behavioral interview covering these themes: - A project you are most proud of - Feedback you received and ho...