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."
Discuss your proudest project
Discuss your proudest project Behavioral prompt — Your most impactful project Context You are in a behavioral/leadership interview for a Software Engi...
Design feedback and feature rollout platform
Design feedback and feature rollout platform System Design: Feedback + Feature Rollout Platform Context Build a multi-tenant platform that lets produc...
Design LLM-enhanced recommendation solutions
Design LLM-enhanced recommendation solutions System Design: Incorporating Large Language Models (LLMs) into a Large-Scale Recommendation System Contex...
Answer Amazon Leadership Principles questions
Answer Amazon Leadership Principles questions Behavioral Interview Prep: Amazon Leadership Principles (Software Engineer, Onsite) Context You are prep...
Compare final, finally, finalize
Compare final, finally, finalize Compare Java's final keyword, the finally block, and the finalize() method. For each, explain purpose, typical use ca...
Assess HashMap vs ConcurrentHashMap
Assess HashMap vs ConcurrentHashMap Is Java's HashMap thread-safe? Explain why or why not. How does ConcurrentHashMap achieve thread safety and perfor...
Design a mini banking system
Design a mini banking system In-Memory Banking System — Design and Implementation You are to design and implement an in-memory banking system that sup...
Design consistent hashing with a sorted map
Design consistent hashing with a sorted map Consistent Hashing with a Sorted Map (Virtual Nodes) Context You are building a client-side library to map...
Explain Transformer Layers and FFN Rationale
Explain Transformer Layers and FFN Rationale Explain the Transformer architecture in detail, then walk through the math step by step. 1. Describe the ...
How would you test swapping two CTA buttons?
You work on the Airwallex marketing/product landing page. There are two primary CTA buttons: - “See a demo” - “Get started” A proposal suggests swappi...
Answer product, collaboration, and prioritization scenarios
Behavioral / Leadership prompts Answer the following (you can assume a 35–40 minute behavioral interview): 1. Intro (5 minutes): Walk through your bac...
Measure impact of bot mitigation via experiment
Experiment Design: Measuring the Impact of a Bot‑Mitigation System Context You are evaluating a production change to a large social platform that hide...
Design bot detection and evaluate trade-offs
Bot-Detection System Design for Comment Activity Context You are designing and evaluating a machine learning system to detect automated (bot) comment ...
Estimate bots and CI from DAU spike
This question evaluates proficiency in mixture modeling for anomaly detection, parametric and nonparametric inference for mean differences, handling o...
Build and evaluate donation propensity model
You need a model to maximize expected net revenue from solicitations. Costs: online reach costs $1 per person; gala attendance costs $100 per attendee...
Dissect a failure and corrective actions
Describe a recent failure. Explain: a) root causes (your decisions vs. external factors) using a 5 Whys or fault-tree; b) early warning signals you mi...
Measure a friend-recommendation launch
A new friend-recommendation algorithm ships behind a feature flag. Design how you will measure success and decide whether to launch: - State no more t...
Graph WTP vs content and explain cap
Willingness-to-Pay (WTP) vs. Content Quantity Context Assume the number of available shows is a nonnegative quantity S (S ≥ 0). A customer's maximum w...
Compute monthly break-even subscribers
Break-even Analysis for a Subscription Streaming Service Context A streaming startup incurs monthly fixed costs and per-subscriber variable costs and ...
Diagnose 10–11% usage drop across geos
US usage is down 10% and Mexico is down 11%. List plausible confounders (seasonality, pricing, outages, marketing mix, competitor moves, feature rollo...