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."
Evaluate Notification-Based Account Ranking
This question evaluates a data scientist's competency in causal inference, A/B test and experiment design, metric definition and selection, statistica...
Solve mixed coding tasks from interviews
Solve the following interview-style coding problems (you may choose any programming language unless specified). Provide correct logic and handle edge ...
Insert parentheses to minimize expression value
You are given a string expression of the form A+B, where A and B are non-empty strings of digits (no digit is '0'). You must insert exactly one pair o...
Solve small string and API tasks
This question evaluates proficiency in string algorithms (bracket validation and longest non-repeating substring) and practical API skills including H...
Maintain a Streaming Median
You are designing a component that receives integers one at a time and must return the current median after each update. Example: - After processing [...
Filter Invalid Data Events
This question evaluates a candidate's ability to implement data validation, deduplication, stable filtering, time-range and allow-list checks, and to ...
Compute sum over consecutive-step subarrays
This question evaluates proficiency in array processing, detection of consecutive-step arithmetic sequences, and accumulation of subarray sums with at...
Check if a binary tree is complete
This question evaluates understanding of binary tree properties and traversal techniques, testing competency in data structures and algorithmic reason...
Implement ASCII canvas and solve two data problems
Solve the following coding tasks. 1) ASCII Canvas / Printer Implement a small drawing engine for a fixed-size canvas of width = 10 and height = 6. - E...
Extend a Maze Solver
This question evaluates proficiency in implementing and debugging graph search algorithms and state-space modeling, including correct visited-state ha...
Detect and remove matched words in a char stream
This question evaluates understanding of online stream processing, substring matching, and the use of efficient data structures and algorithms for rea...
Fill rooms with nearest-gate distance
You are given an m×n grid representing a building floor plan: - -1 = wall/blocked cell - 0 = gate - A large positive number (e.g., INF = 2^31-1) = emp...
How would you design an ETA prediction system?
This question evaluates a data scientist's capability to design an end-to-end ETA prediction system, testing competencies in machine learning modeling...
Compute ways to climb n steps
Implement a function that returns the number of distinct ways to reach the top of a staircase with n steps if you can climb either 1 or 2 steps at a t...
Calculate Daily Driver Pay
You are given a one-day event log for a delivery driver. Each input record is a JSON event with fields such as order_id, event_type, timestamp, and ba...
Find the nth prime number
Given an integer n (1-indexed), return the n-th prime number (e.g., n=1 -> 2, n=2 -> 3, n=3 -> 5). Design an algorithm that is efficient for moderatel...
Can You Reach the Last Index?
This question evaluates a candidate's understanding of array traversal and reachability in sequences of jumps, along with the ability to reason about ...
Find high-value crypto users and top-CTR product
You are given three tables (timezone: UTC). Assume create_date, transaction_time, and event_time are timestamps. Tables users - user_id BIGINT PRIMARY...
Implement Batched Undo/Redo Layer
You are implementing a simplified document layer for a design tool. The layer stores properties as a map<string, string>. Implement a class that suppo...
Solve sliding-window, flattening, decode, and O(1) random set
This multi-part question evaluates competence in string processing and nested parsing, linked-list flattening and recursion depth management, dynamic ...