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."
Implement Minesweeper and Word Search
This multi-part prompt evaluates grid-based algorithmic skills, including randomized board construction with neighbor counting, straight-line pattern ...
Design an Uber Eats Cart Service
This question evaluates a candidate's ability to design a distributed shopping-cart service for a food-delivery platform, testing competencies in syst...
Explain Your Project and Manager Feedback
You are interviewing for a Machine Learning Engineer role on a news product. Answer the following behavioral questions clearly and concisely: 1. Walk ...
Solve Merge Lists and Vertical Traversal
This question evaluates proficiency with merging sorted linked lists and performing vertical traversal of binary trees, focusing on algorithms, data s...
Design a Twitter-like timeline service
Design a simplified Twitter-like system. The system should support: - User accounts and profiles - Follow and unfollow - Creating short text posts - V...
How would you throttle a crawler?
The crawler above is now a production service. Expanding each page requires an outbound HTTP or API call to fetch its links, and upstream services may...
Design a TinyURL-like short link service
Design a TinyURL-like service that generates short URLs and redirects users to the original long URLs. Requirements: - Provide APIs to create a short ...
Implement String Encryption and Decryption
This question evaluates understanding of string encoding and mapping, including handling non-bijective character-to-code relationships and performing ...
Explain differences between Python list and tuple
In Python, what are the key differences between a list and a tuple? Cover: - Mutability and implications - Performance and memory considerations (high...
Explain fraud types and evaluate a fraud model
You are interviewing for a Fraud Data Scientist role at PayPal. Answer the following: 1) List common fraud types relevant to payments (e.g., account t...
Design a Story feature with offline support
This question evaluates proficiency in large-scale system design, including distributed storage, cache and CDN strategies, API and data model design, ...
How would you scale rule evaluation?
Design a scalable expense-policy rule engine for one million rules and thousand-record batches. Covers structured rules, predicate indexes, bitset eva...
Compare convolutions and transformers
Compare CNNs and Transformers Task Explain the key differences between convolutional neural networks (CNNs) and transformer architectures. Specificall...
Describe a challenging project you led
Behavioral Prompt: A Challenging Project You Led or Contributed To Context: Technical screen for a Machine Learning Engineer role. The interviewer ask...
Design a time-series home-buy decision classifier
Take‑Home: Classifying Buy‑Now vs Wait Decisions in Housing Time Series Context You are given a monthly panel of regional housing and macro time serie...
Design an LRU Cache with a Constant-Time Average
Design an LRU Cache with a Constant-Time Average Design an in-memory cache with fixed positive capacity. Keys are unique strings and values are signed...
Compute longest increasing subsequence length
This question evaluates understanding of sequence analysis and algorithmic problem solving, assessing competency with subsequences, reasoning about co...
Describe cross-team collaboration and learning from failure
Answer the following behavioral prompts using specific examples from your experience: 1. Cross-team collaboration: Tell me about a project where you w...
Design dice betting strategy under time limit
Repeated Dice Betting with Time and Risk Constraints You have T = 10 minutes and an initial bankroll B = $1,000 to play a repeated betting game with a...
Find target-heavy sliding windows
This question evaluates array manipulation, counting and efficient algorithm design—focusing on the sliding-window technique for detecting and quantif...