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."
Find all pairs summing to target in sorted array
Given a non-decreasing array of integers nums and an integer target, return all unique pairs of indices (i, j) with i < j such that nums[i] + nums[j] ...
Implement transactional key–value store
Design and implement an in-memory key–value store that supports transactions and nested transactional blocks. Your system must process a stream of com...
Implement scalable word count locally
Write a function that reads a very large text file and outputs the frequency of each word. Define your tokenization and normalization rules (case fold...
Find connected region sizes in matrix
Given an m x n grid of characters grid and a target character ch, implement: ( 1) sizeOfRegion(grid, r0, c0, ch) -> int that returns the size of the 4...
Find earliest supporting version under constraints
You are given version strings formatted as {major}.{minor}.{patch}, e.g., "103.003.03". Each version either supports a feature or not. You may call is...
Find shortest path using BFS
Given an m×n grid grid where grid[r][c] = 0 represents an empty cell and 1 represents a wall, a start cell (sr, sc), and a target cell (tr, tc), you m...
Implement 2D convolution using NumPy slicing
Implement 2D convolution on a 4×4 input and a 3×3 filter with stride 1 using NumPy. Avoid explicit Python loops by relying on array slicing, broadcast...
Compute community ranges and town idle hours
You are given two in-memory datasets for a party-planning app. 1) PartyWindow: {partyId: string, startTime: ISO-8601 UTC datetime, endTime: ISO-8601 U...
Use Excel formulas to compute haircuts
You are given an Excel worksheet with columns such as Asset, Market Value, and Haircut %. Using only cell references (no copy-paste of numeric values)...
Design an in-memory database with TTL and history
Design and implement an in-memory key–field–value store with monotonic timestamps. Keys and fields are strings; values are integers. Provide these API...
Implement binary search lower/upper bounds
Question Given a non-decreasing sorted integer array nums of length n and a target value, implement two functions using binary search: 1. lower_bound(...
Compute most popular location with weights
You are given a dataset of voting records for concert locations. Each record includes voter_id, location_text, and an optional numeric weight (default...
Load and prepare JSON for modeling
Using Python in a Jupyter notebook, load a JSON dataset with fields: ( 1) hours spent reading A posts (float), ( 2) hours spent reading B posts (float...
Merge two interval lists into a union
You are given two lists of closed intervals [start, end]. Each list is individually sorted by start and contains non-overlapping intervals. Merge the ...
Search target in unknown-length sorted array
You have read-only access to a sorted, increasing array-like interface of unknown length that supports get(i), which returns a valid integer for in-bo...
Search a word in a grid
Given a 2D grid of characters and a target word, determine if the word can be traced by moving up, down, left, or right, using each cell at most once....
Implement a recency-eviction bounded cache
Implement an in-memory key–value store with a fixed capacity N that uses recency-based eviction. Support: get(key) -> value or -1 if missing, and put(...
Find normalized list difference efficiently
Given two lists of strings, list1 and list2, return all elements that appear in list1 but not in list2 after applying a consistent normalization step ...
Count subarrays with product under target
Given an array of positive integers nums and an integer T > 1, return the number of contiguous subarrays whose product is strictly less than T. Provid...
Simulate 1-D collisions and scale to huge inputs
Given an array of integers representing objects on a 1-D track, where the sign indicates direction (positive moves right, negative moves left) and the...