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 GPS positioning and errors
Explain how GPS works at a high level. Your answer should cover how satellites and a mobile receiver estimate location, how signal propagation time is...
Describe conflict, ambiguity, and process improvement
Prepare STAR-style responses for these behavioral prompts: - Tell me about a time you had a conflict with your manager. - Tell me about a time you imp...
Design a Scalable Product Authentication Platform
Design the authentication infrastructure for a cloud product. Users log in with email and password; the design should be able to add external identity...
Explain hash collisions and Java HashMap complexity
Explain hash collisions and Java HashMap complexity in a software engineering interview. Cover how hashing works, what a collision is, how a hash tabl...
Minimum Character Changes to Make Every k-Length Block a Palindrome
Minimum Character Changes to Make Every k-Length Block a Palindrome You are given a password string and an integer k. The length of password is guaran...
Design a Checkers Game Simulator
Design and partially implement an object-oriented simulator for a two-player checkers-like board game. Requirements: - The game is played on an 8 x 8 ...
Explain arrays and memory layout
What is an array? How is an array represented in memory (contiguous layout, element size and alignment, indexing arithmetic). Analyze time complexitie...
Reduce frontend network requests efficiently
Reduce Redundant Frontend Requests for Availability and Pricing Context You are designing the web client and APIs for a bookings marketplace that disp...
Explain and derive importance sampling estimators
Importance Sampling: Estimators, Properties, Optimal Proposals, and ESS Context You want to estimate an expectation under a target distribution p over...
Compute transfers to balance account debts
Problem: Balance accounts by generating transfers You are given a dictionary/map balances from accountId -> netBalance. - A positive balance means the...
Implement Recursive React JSON Viewer with Collapse
Implement Recursive React JSON Viewer with Collapse React JSON Tree Viewer (Read-Only, Recursive) Design and implement a React component that accepts ...
Clarify CodeSignal partial credit and score access
CodeSignal Multi‑Level Task Scoring and Score Visibility Context You are completing a multi‑level coding task on CodeSignal as part of a take‑home ass...
Describe product usage, feedback, and music experience
Behavioral: Product Usage, Feedback, and Music Background Context You are interviewing for a Software Engineer role at a music-tech company. Assume th...
Design auth, session security, and top-N users
Web App Design: Authentication, Security, and Top-N Active Users Context: Build a browser-based web application where a user signs in and the page dis...
Maximize pay by flipping k rest days
Given integers BasePay and Bonus, a binary string schedule of length n where '1' means work and '0' means rest, and an integer k, you may change up to...
Design a GPT chat UI with snapshots and sharing
System Design: End-to-End Web App for Interacting with a GPT-like Model Context You are designing a multi-tenant, browser-based SaaS application that ...
Design streaming difference at scale
Design a Near Real-Time Anti-Join: Stream vs. Large Reference List You are given: - list1: an unbounded, high-throughput event stream of keys (e.g., u...
Describe your background and impact
Walk Me Through Your Background (HR Screen — Software Engineer) Prompt Provide a concise walkthrough of your background focusing on: 1. Most relevant ...
Explain database design and consistency
System Design (Technical Screen): Database Portion of a Project Provide a structured description of the database component of a real project you owned...
Convert stack samples to execution trace
You are given sampling-profiler output: a list of Sample objects ordered by timestamp ascending. Each Sample has (t: float, stack: list[str]) where st...