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 IP Address Arithmetic
This question evaluates proficiency in IP addressing, parsing and validation, binary/address-space arithmetic, CIDR subnet calculation, and formatting...
Detect a Winner on a 3x3 Tic-Tac-Toe Board
Detect a Winner on a 3x3 Tic-Tac-Toe Board Implement tic_tac_toe_winner(board) for a completed or partially completed 3x3 board. Each cell is "X", "O"...
Describe your most and least engaging work
You are interviewing for a Data Scientist role. The hiring manager asks: What kinds of work have been the most engaging for you, and what kinds have b...
Prepare Leadership And Collaboration Stories
Prepare concise behavioral interview answers for the following prompts. Use specific examples from your own experience, quantify impact where possible...
How would you measure product success?
This question evaluates a data scientist's ability to design and interpret product analytics for a subscription-based, seat-licensed collaborative pro...
Least Frequently Used (LFU) Cache
This question tests practical data structure design by requiring an O(1) implementation of a Least Frequently Used cache with tie-breaking by recency....
Java and Object-Oriented Design Fundamentals
This question assesses mastery of software engineering fundamentals across object-oriented design, Java collections, and the Spring framework. It test...
Search Words and Phrases in a Large Line-Oriented File
Search Words and Phrases in a Large Line-Oriented File A text file contains one sentence per line and may be much larger than memory. Design an API th...
Compare streaming frameworks and delivery semantics
Name popular streaming/data-processing frameworks (e.g., Kafka-based stacks, Flink, Spark Streaming, etc.). Explain at-most-once, at-least-once, and e...
Use Bayes to interpret a broken radar alarm
This question evaluates Bayesian probabilistic reasoning, understanding of base rates, sensitivity/specificity, decision-theoretic trade-offs between ...
Explain worker state machine load balancer design
You are designing a lightweight load balancer for a Python-based backend service that dispatches tasks to a pool of worker processes. Describe how you...
Build a model using only pandas/numpy
You are given a tabular dataset as a pandas DataFrame df with: - Feature columns (numeric and/or categorical) - A target column y (either binary class...
Explain project choices, metrics, and AI usage
Behavioral / Project deep-dive You’ll be asked to walk through a recent project you worked on (preferably one with meaningful technical and business i...
Traverse a path and print directory tree
This question evaluates proficiency with filesystem I/O, path validation, directory traversal, recursion and error handling in Node.js, plus the abili...
Design a multi-level API rate limiter
This question evaluates understanding of rate limiting, distributed system design, concurrency control, scalability, and operational observability whe...
Calculate Triangle Probability From Broken Stick
A stick of length 1 is broken into three pieces by choosing two cut points independently and uniformly at random along the stick, then sorting the two...
Design a Top-K Ranking Service
This question evaluates a candidate's ability to design scalable, real-time Top-K ranking services, testing competencies in distributed systems, strea...
Design a scalable interview question bank
Design a scalable interview question bank System Design: Scalable Interview Question Bank Platform Context Design a multi-tenant SaaS platform for org...
Design a Multi-Provider Financial Dashboard
Design a financial dashboard that shows account balances, stock holdings, cryptocurrency holdings, and derived portfolio metrics. Data arrives from mu...
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...