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 basic bank system API
In-Memory Bank System: API, Data Model, Invariants, Semantics, and Edge Cases Goal Design and implement an in-memory bank system that supports account...
Design distributed parallel job processing
Design a Distributed System for Parallel Job Execution Context You are asked to design a highly available, horizontally scalable service that executes...
Clarify employment type at Microsoft
Behavioral Question: Contractor vs Full‑Time Experience at Microsoft Context You are in a Software Engineer onsite behavioral round. The interviewer w...
Explain imbalance, metrics, bias-variance, Transformers vs. CNNs
Question You are given a highly imbalanced binary classification problem in a fraud-detection setting (roughly 1% positives). Walk through the core ML...
Walk through a project in detail
Walk Through a Significant Project Provide a deep-dive on one impactful project you led or contributed to. Cover: 1. Timeline: Start/end dates and maj...
Implement prioritized refund allocation engine
Implement a refund allocation function that takes: (a) a list of payments, each with a unique paymentId, method ∈ {CREDIT, CREDIT_CARD, PAYPAL}, ISO-8...
Implement merge-in-place and group cyclic-equivalent strings
You are given two ascending arrays to merge in place and a separate grouping task: Part A — In-place merge without known sizes: - Array A contains sor...
Describe a failure and learning
Behavioral Question: Learning from Failure (Software Engineering) Describe a project where you failed or missed key objectives: 1. What happened? Prov...
Design a scalable banking system
System Design: Core Banking Platform Problem Design a banking system that supports: - Account creation - Balance inquiry - Deposit and withdrawal - At...
Identify research to improve business
Analytics & Experimentation Strategy to Improve Business Outcomes Context Assume you are a software engineer interviewing for a role focused on analyt...
Describe a quantitative market model
Interview Prompt: Quantitative Model for Market Data Provide a concrete example of a quantitative model you built to analyze market data. Cover the fo...
Maximize Boundary-Difference Subarray Sum
Given an integer array nums and an integer k, find the maximum possible sum of a non-empty contiguous subarray whose first and last elements differ by...
Build a File-Backed Key-Value Store
This question evaluates a candidate's understanding of persistent key-value storage, in-memory versus on-disk state management, serialization/deserial...
Track Users From Flight History
You are given an unsorted list of flight records. Each record contains departure_airport, departure_time, arrival_airport, arrival_time, and user_id. ...
Determine Threshold-Constrained Connectivity
This question evaluates understanding of graph algorithms and constrained connectivity, testing skills in reasoning about weighted undirected graphs, ...
Handle conflict and urgent shifting priorities
Answer the following behavioral questions with concrete examples from your experience: 1. Describe a conflict you had with a partner or teammate. What...
Return the largest file size in a directory
Problem (Bash / File System) Implement a Bash function (or shell snippet) that returns the maximum file size (in bytes) under a given directory. Requi...
Train with imbalanced sampled data
You are training a binary classifier on a very large dataset where the positive class is rare. Because the full dataset is too large to train on direc...
Design an OOD restaurant management system
Object-oriented design: Restaurant management system Design an object-oriented system for a dine-in restaurant that supports the following: Functional...
Design a GitHub-like user community
System design: GitHub-like user community Design the backend for a “developer community” product inspired by GitHub’s social layer. Core requirements ...