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."
Write PostgreSQL updates with date filters
Write PostgreSQL statements to: ( 1) update a flight's price and set updated_at correctly; ( 2) upsert a booking record with conflict handling; ( 3) s...
Identify and prevent code-breaking inputs
Identify and prevent code-breaking inputs Identify inputs and scenarios that could break your implementation and explain how you would prevent them. C...
Implement and compare key design patterns
Implement and compare key design patterns Implement Core GoF Patterns in Java and Discuss Trade-offs Context You are designing a small Java library an...
Identify OS component causing process starvation
A system with 2 CPU cores runs 5 identical processes continuously. Four processes get equal CPU time, but the fifth appears to get none. Which part of...
Solve two DS&A optimization problems
Problem 1 — Maximize alternating-sum over four array partitions: Given an integer array arr[1..n] (1-based). Choose indices a, b, c with 1 ≤ a ≤ b ≤ c...
Find shortest word transformation with caching
Find shortest word transformation with caching You are given a start word and an end word of equal length, and a dictionary of valid words. In one mov...
Compute total covered interval length
Compute total covered interval length Given a list of integer intervals [l, r) (half-open), compute the total length covered by at least one interval....
Maximize funds with capital-gated projects
Maximize funds with capital-gated projects You start with initial funds W and may undertake at most K projects. Each project i has a required capital ...
Compute sum of longest positive subarray
Compute sum of longest positive subarray Given an integer array that may contain positive and negative numbers, find the sum of the longest contiguous...
Design a duplicate-file removal algorithm
Design a duplicate-file removal algorithm Your filesystem contains millions of photos. Duplicates are strictly byte-identical files (no ML/CV similari...
Discuss Airbnb motivations, hosting, feedback, community, challenges
Discuss Airbnb motivations, hosting, feedback, community, challenges Airbnb Software Engineer Onsite — Behavioral & Leadership You are interviewing fo...
Compute minimal cost to merge numbers
Compute minimal cost to merge numbers Given an array of positive integers, you may repeatedly perform the following operation until one number remains...
Simulate robot on grid with obstacles
Simulate robot on grid with obstacles A robot starts at (0, 0) on an unbounded integer grid. You are given a sequence of commands consisting of charac...
Decide string transform with directional tokens and walls
Decide string transform with directional tokens and walls You are given two equal-length strings start and target of length n, each consisting only of...
Explain your background and career choices
Explain your background and career choices Behavioral Technical Screen: Resume Walkthrough and Career Narrative Context You will be asked to present a...
Implement a pivot table transformation
Given a dataset of transactions with columns: user_id (string), category (string), subcategory (string), amount (float), ts (ISO timestamp), implement...
Design a key-value store with getLast
Design a key-value store with getLast Design and implement an in-memory key–value store with this API: add(key, value), get(key), remove(key), and get...
Solve tree traversal and two-pointer problems
Solve tree traversal and two-pointer problems Implement the following independent problems: 1) Vertical columns: Given a binary tree, return lists of ...
Discuss integrity vs efficiency trade-offs
Discuss integrity vs efficiency trade-offs Behavioral: Balancing Integrity vs Speed Under Pressure (Software Engineer Onsite) Context You’re asked to ...
Copy linked list with random pointers efficiently
Copy linked list with random pointers efficiently Given the head of a singly linked list where each node has next and random pointers, create a deep c...