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."
Design a Ride-Hailing Platform
This question evaluates system design and distributed systems competencies, focusing on real-time location tracking, scalable API and storage design, ...
Solve quick probability questions
Rapid-Fire Probability Questions You are in a timed quantitative screen. Answer each of the following independent probability questions, ideally in we...
Design cloud storage system
Design cloud storage system In-Memory Cloud Storage: Design and Implement You are asked to design and implement an in-memory cloud storage system that...
Design a Cache with Hit Counts
This question evaluates a candidate's competence in system design, data structures, concurrency, and observability by requiring a key-value cache that...
Design a Real-Time Logging System
Design a logging/telemetry system for a large application platform. Requirements: - Many services send log or metric events to the system - Event subm...
Simulate bus boarding with priority and wheelchairs
You are implementing a simplified bus boarding simulator. Model: - Person has at least: - id (string/int) - priority (boolean): if true, they shou...
Measure Billboard Campaign Impact: Design, Bias, Test Strategy
Measure Billboard Campaign Impact: Design, Bias, Test Strategy evaluates metric design, causal reasoning, experiment setup, diagnostics, SQL/statistic...
Compute an A/B test p-value by hand
In an A/B test on a game feature, you measure conversion rate (binary outcome). - Control: n₁ = 1000 users, x₁ = 120 conversions - Treatment: n₂ = 980...
Write SQL window functions for D7 retention
Assume you have the following tables (timestamps are in UTC). 1) game_sessions - user_id (STRING) - session_start_ts (TIMESTAMP) - country (STRING) Ea...
Make tree iterators safe under concurrency
This question evaluates understanding of concurrent data structures, iterator safety, synchronization mechanisms, and reasoning about shared mutable s...
Design favorites and social game recommendations
This question evaluates a candidate's ability to design scalable backend systems for social features, assessing competencies in data modeling, event-d...
Explain BatchNorm, optimizers, and L1/L2
This question evaluates a candidate's understanding of core machine learning fundamentals—Batch Normalization, optimizer behaviors (SGD, Momentum, RMS...
Design authorization and audit logging systems
This question evaluates competency in designing secure authorization and audit logging systems, including access-control models (RBAC/ABAC/hybrid), po...
Track Customer Revenue and Referral Revenue
Track Customer Revenue and Referral Revenue Problem Implement a top-level function that processes an in-memory customer revenue tracker through a lite...
Handle Cross-Team Dependencies and Scope Conflicts
Answer the following behavioral interview questions using a concrete example from your experience: 1. You depend on another team to complete work, but...
Find constant minimizing absolute error
This question evaluates understanding of L1 loss minimization, robust central-tendency estimators, and order-statistics reasoning for point estimation...
Explain ML and LLM fundamentals
You are interviewing for an AI Engineer role. Explain the following concepts and how they affect real systems: 1. What is F1 score, and when is it mor...
Design a distributed tree node counter
Design a distributed tree node counter Distributed Tree Node Count with Two Messages You are given an N-ary tree of machines (one process per node). E...
Terminal-Controlled Grid Rover Simulator
This question evaluates a candidate's ability to model stateful simulation logic, translating grid coordinates, heading rotations, and sequential comm...
Design an Expected O(1) Randomized Container
Design an Expected O(1) Randomized Container Design a generic container that stores distinct elements and supports: - insert(element) -> bool: add an ...