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."
Optimize repeated-value vectors and compute exclusive times
You are given two separate coding tasks from an interview. Task 1: Optimize storage for vectors with repeated values, then compute dot product You are...
Reverse linked list in fixed-size groups
Problem You are given the head of a singly linked list and an integer k (k >= 1). Reverse the nodes of the list in-place in groups of size k: - The no...
Merge multiple sorted arrays using min-heap
Problem You are given k sorted arrays of integers: - arrays[0], arrays[1], ..., arrays[k-1] - Each arrays[i] is sorted in non-decreasing order. - The ...
Compute outer boundary of an N-ary tree
You are given the root of a rooted N-ary tree. Each node contains: - An integer value. - An ordered list of children from left to right (0 or more chi...
Find k-th largest element in array
You are given an unsorted array of integers nums and a positive integer k. Design an efficient algorithm to find the k-th largest element in the array...
How to design Shop ad ranking
This question evaluates a candidate's expertise in machine learning and data science for ad ranking systems, including objective formulation and trade...
Match payments to invoices by memo or amount
Scenario You are building a small reconciliation tool that matches payments to invoices. Data structures Assume you are given: - invoices: a list of i...
Find all unique triplets summing to zero
Problem Given an integer array nums, return all unique triplets [nums[i], nums[j], nums[k]] such that: - i, j, and k are distinct indices (i != j != k...
Compute maximum perimeter among islands
This question evaluates a candidate's proficiency with grid traversal, connected-component identification, and perimeter computation in binary matrice...
Compute win probability in coin-toss game
Two players, A and B, play the following game with a fair coin: - They toss the coin alternately: A tosses first, then B, then A, then B, and so on. -...
Explain Kafka Reliability and Offset Recovery
This question evaluates understanding of distributed messaging and event-processing concepts, specifically partitioning effects on ordering, paralleli...
Validate parentheses with one or three bracket types
Problem Given a string s consisting only of bracket characters, determine whether it is valid. A string is valid if: - Every opening bracket has a cor...
Count Regions in a Binary Grid
This question evaluates understanding of grid-as-graph representations, identification of connected components, and competency in algorithmic problem-...
Implement transaction network queries
Problem You are building a small in-memory library to track pairwise customer transactions and answer connectivity questions about who has transacted ...
Implement four DS coding tasks
You are completing a CodeSignal-style assessment (Python or R). Implement solutions for the following four independent questions. 1) Two-sample z-test...
Print directory tree with indentation
You are given a root directory of a filesystem represented as a tree. Each node is either a directory (can have children) or a file (no children). Pri...
Implement hierarchical folder access check
You are asked to simulate a simple hierarchical file system and implement an access-check function. The file system consists of folders arranged in a ...
Compute max coins with 3-step token moves
You are given a one-dimensional board with n positions represented by a string s of length n: - . = empty cell - T = token - C = coin You may move tok...
Assign bookings to minimum tennis courts
This question evaluates interval scheduling and resource-allocation competencies, testing algorithmic and data-structure knowledge for handling time-i...
Build a time-based key-value store
Problem Design a data structure that stores multiple values for the same key at different timestamps, and can retrieve the most recent value as of a g...