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 longest substring with at most k distinct
Given a string s and an integer k, return the length of the longest contiguous substring that contains at most k distinct characters. Provide an O(n) ...
Implement string-based big integer multiplication
Question Implement multiplyStrings(a, b) to multiply two non-negative integers given as decimal strings and return their product as a decimal string. ...
Compute currency conversions with graph algorithms
Question You are given a set of pairwise currency exchange relations such as A:B = 1:1.5 and B:C = 1:1.5, meaning 1 A = 1.5 B and 1 B = 1.5 C. Design ...
Check balanced parentheses with multiple bracket types
Given a string containing only parentheses '()', determine whether it is balanced. Follow-up: extend the solution to also support '[]' and '{}' with c...
Implement cocktail shaker sort and analyze
Implement the cocktail shaker sort (bidirectional bubble sort) for an array of integers. Optimize it with early termination and shrinking bounds, and ...
Explain conflict resolution and growth
Behavioral & Leadership: Conflict, Mistake, and Project Deep Dive To assess collaboration, ownership, and technical leadership, answer the following t...
Solve expression evaluator and string decoder
1) Implement an arithmetic expression evaluator that reads expressions from a text file (one expression per line) and outputs the evaluated result for...
Check path in N-ary tree
Given the root of an N-ary tree and a sequence of integers path[0..k-1], determine whether there exists a path starting at the root whose node values ...
Design room progression with leaderboard
Design a data structure to simulate a sequence of rooms where players solve tasks and can move only to the next room once finished. Support the follow...
Explain database transactions and ACID
Database Transactions and ACID under Concurrency Prompt You are working with a relational database that supports transactions and multiple isolation l...
Determine frog reachability across stones
You are given a sorted array of distinct integers stones representing stone positions in a river, where stones[0] = 0. A frog starts on stone 0; its f...
Discuss product sense and team fit
Product Sense and Team Fit: Language-Learning App (Software Engineer) You are interviewing onsite for a Software Engineer role at an early-stage langu...
Design product co-occurrence analytics API
Design RESTful APIs for Co‑Purchase Analytics Context You are designing backend APIs to power a "related products" module based on co‑purchase behavio...
Solve parsing, counting, ranges, and window problems
Solve the following four algorithm problems: 1) Expression evaluator with + and : Given a string s containing non-negative integers, '+' and '' operat...
Compute shortest path between tree nodes
Question You are given the root of a binary tree (not necessarily a BST) whose nodes have integer values, and two target values u and v. Implement a f...
Reverse sublist between equal-value nodes
Given the head of a singly linked list and a target value v that appears at least twice, reverse the sublist starting at the first node with value v a...
Handle invalid input at system level
Design: Validation and Error Handling for a Top-K Frequency API Context You are designing a REST endpoint that computes the top-K most frequent values...
Count subarrays summing to target
Given an integer array nums and an integer target T, return the number of contiguous subarrays whose sum equals T. Provide an algorithm that runs in l...
Design adjustable ID allocator
Question You manage a fixed global integer ID space [0, 999] (1000 IDs total) and a set of named buckets. Each bucket has a unique name and occupies a...
Implement compile-time function type verification
Implement a C++20 compile-time utility to verify whether a callable matches a target function type. Requirements: create a primary template is_callabl...