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."
Validate Adding an Edge to a Directed Acyclic Graph
Determine whether a proposed directed edge is new and can be added to an existing DAG without creating a cycle. Reject self-loops and duplicates, then...
Calculate Trapped Rain Water
Calculate how much rain water is trapped between nonnegative unit-width bars without mutating the input. A two-pointer scan tracks the highest boundar...
Reconstruct the Alphabet Order of an Alien Language
This question tests graph construction and topological sorting, core algorithmic skills for reasoning about partial orderings derived from constraints...
Design and Monitor a Multi-Country Parameter Experiment
Prepare for experimentation questions spanning sample size, duration, variance reduction, multi-arm parameter tuning, sequential monitoring, and cross...
Interpret a Streaming Regression Without Overstating Causality
Learn to explain regression coefficients and confidence intervals to a product partner without turning association into causation. Examine confounding...
Implement A Contiguous Memory Allocator With Free-Block Coalescing
Review a contiguous memory allocator coding prompt with malloc, free, first-fit allocation, block coalescing, and a best-fit follow-up. The interview ...
Merge Overlapping Intervals
This question tests practical array manipulation and sorting skills by requiring candidates to consolidate overlapping numeric intervals into a minima...
Can All Courses Be Completed?
This question tests graph traversal and cycle detection skills, specifically the ability to model dependency relationships as a directed graph. It eva...
Shift Non-Zero Elements Left In Place
This question tests a candidate's ability to perform in-place array manipulation while preserving element order, evaluating practical understanding of...
Check Meeting Attendance With Breaks
This question evaluates proficiency with interval scheduling, time-format conversion, and constraint checking for sequential appointments, measuring a...
Find the Maximum Number of Concurrent Processes
Practice a Amazon coding interview problem focused on find the maximum number of concurrent processes. The prompt emphasizes edge cases, clean impleme...
Evaluate an Arithmetic Expression in Postfix Notation
Practice a Amazon coding interview problem focused on evaluate an arithmetic expression in postfix notation. The prompt emphasizes edge cases, clean i...
Find the Closest Version by Date
Practice a Amazon coding interview problem focused on find the closest version by date. The prompt emphasizes edge cases, clean implementation, and ve...
Choose the Best Travel Mode
Solve a grid-based pathfinding problem where a traveler must choose the transportation mode with the lowest travel time and cost tie-breakers. The que...
Hierarchical Access Control for an Advertising Platform
This question tests practical application of graph traversal and access control system design using a directed acyclic group hierarchy. It evaluates a...
Rearrange Tasks With Cooldown
This question evaluates task-scheduling and constraint-handling skills, testing algorithmic reasoning about arranging repeated jobs with cooldown cons...
Design a Driver Leaderboard Based on Reviews
Design a service that ranks drivers from customer reviews and serves a top-driver leaderboard. The system must accept immutable review events containi...
Implement and Test a Sliding-Window Rate Limiter
Implement and Test a Sliding-Window Rate Limiter Design an in-memory limiter with allow(key, timestamp) for a configurable maximum number of requests ...
Calculate Bowling Game Score
This question evaluates a candidate's ability to implement rule-based scoring logic, array processing, and stateful iteration to correctly aggregate f...
Find Top Errors in Time Window
This question evaluates the ability to parse JSON logs, apply time-window filtering with inclusive/exclusive boundaries, aggregate error frequencies, ...