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."
Count sports by calendar quarter in SQL
You are given a table games(date DATE, team_name TEXT, sport_name TEXT). Write a SQL query that returns, for each year and calendar quarter (Q1–Q 4), ...
Compare core system design tradeoffs with scenarios
System Design Tradeoffs for a Web-Scale Service Context You are designing a web-scale, user-facing transactional service. Compare key architectural ch...
Validate a simplified numeric string
Implement isValidNumber (s) that returns true if and only if the ASCII string s represents a valid number under these simplified rules: - Optional lea...
Solve matrix components, median, and traversals
1) Binary matrix component: Given an m x n grid of 0s (background) and 1s (objects), return the size of the largest connected component where connecti...
Compute maximum beauty of a string
Given a string s, define the beauty of each letter a–z as a distinct integer between 1 and 26, case-insensitive. The beauty of a string is the sum ove...
Maximize stock profit with constraints
Maximize stock profit with constraints Given an array prices of daily stock prices, you may make at most two complete transactions (buy then sell). Af...
How would you measure shop-ads promotion success?
This question evaluates a data scientist's competency in metrics design, experimental evaluation, and causal inference for ads ranking systems, includ...
Explain cloud computing fundamentals
Explain cloud computing fundamentals Design a Cloud-Native, Horizontally Scalable, Fault-Tolerant Web Application for Millions of Users Context You ar...
Compute shortest path with obstacles
Compute shortest path with obstacles You are given an m×n grid with nonnegative cell costs and blocked cells marked '#'. You may move up, down, left, ...
Implement BFS shortest paths with reconstruction
Given an unweighted graph with n vertices and m edges represented as an adjacency list, implement breadth-first search (BFS) from a source vertex s to...
Find LCA in a BST
Find LCA in a BST Given the root of a binary search tree and two keys p and q, return the value of their lowest common ancestor (the deepest node whos...
Design tests to verify shuffle randomness
Design tests to verify shuffle randomness Experiment Design: Is Your Array Shuffle Truly Random? You're given a shuffle(arr) function that takes an ar...
Design a hierarchical locking tree
Design a hierarchical locking tree Design a LockingHierarchy data structure over a rooted tree of N nodes labeled 0..N-1, initialized with an integer ...
Simulate a two-player card war game
Simulate a two-player card war game Implement a function to simulate a two-player card game. Each player has a queue of card ranks (top at index 0), w...
Count subarrays equal to target
Count subarrays equal to target Given an integer array nums and an integer k, count the number of contiguous subarrays whose sum equals k. Solve it in...
Maximize profitable pairs
Maximize profitable pairs You are given an array profits of n integers representing net profit per item and an integer threshold T. You may form disjo...
Select maximum tasks before deadlines
Select maximum tasks before deadlines You are given a set of tasks, each with a positive duration and a deadline (lastDay). You may schedule tasks in ...
Find longest unique substring
Find longest unique substring Given a string s, find the length and one example of the longest substring of s that contains no repeated characters. If...
Manipulate time-series with Pandas groupby
Given a DataFrame events(user_id, event_type, ts_utc, revenue): 1) Parse ts_utc as timezone-aware, convert to America/Los_Angeles, and handle DST tran...
Solve capital selection and grid escape
Solve capital selection and grid escape Implement two functions for algorithmic practice: 1) MaximizeCapitalAfterProjects(k, initialCapital, requiredC...