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."
Design a data structure for dynamic top‑K frequency
Design a data structure that maintains a multiset of integers and supports the following operations efficiently: Operations - insert(x): Add one occur...
Implement a hash table with put/get
Problem Implement a simplified hash table (hash map) data structure from scratch. Required API Design a class HashTable with: - HashTable(int numBucke...
Schedule prerequisite classes with retakes
This question evaluates competency in graph algorithms, dependency resolution, stateful scheduling, and robust error handling within the Coding & Algo...
Minimize coins with overpay and change
This question evaluates algorithmic optimization and combinatorial reasoning in the coin-change domain, measuring proficiency with efficient numeric m...
Compute a moving average on a stream
This question evaluates understanding of streaming data structures, sliding-window aggregation, and the time/space trade-offs involved in maintaining ...
Merge overlapping 2D line segments
This question evaluates computational geometry and algorithmic skills, specifically collinearity detection, geometric segment intersection, merging of...
Maximize events attended given date ranges
This question evaluates understanding of interval scheduling and efficient algorithm design for allocating limited time-based resources, including con...
Compute minimum rooms for time intervals
You are given a list of meeting time intervals, where each interval is represented as [start, end) (start time inclusive, end time exclusive) and star...
Implement retrieval and evaluation for a simple RAG
This question evaluates understanding of embedding-based retrieval, cosine similarity ranking, and retrieval evaluation metrics (Recall@10 and MRR@10)...
Reconstruct DNA from tagged fragments
This question evaluates understanding of sequence reconstruction, graph modeling, and traversal/orientation constraints, focusing on ordering labeled ...
Group strings that are anagrams
This question evaluates string-processing and data-structuring competency, focusing on identifying and grouping anagrams through comparison of unorder...
Generate NFT metadata and ensure uniqueness
You are implementing an NFT metadata generator. Each NFT is defined by selecting exactly one trait value from each trait category. You must generate a...
Maximize minimum after K decrements
You are given an integer array A of length N and an integer K. You must perform exactly K operations. In each operation, choose any index i and do A[i...
Design a payment system with holds and batching
This question evaluates a candidate's competency in designing reliable, auditable payment workflows, covering authorization holds, batch settlement, i...
Implement follow graph with snapshots
This question evaluates a candidate's ability to design efficient persistent data structures and versioned state management for time-travel queries in...
Find accessible devices via nested memberships
Problem You are given an access model with nested groups: - A group can contain users and also contain other groups (subgroups). - A user can own or b...
Discuss salary expectations
Compensation Expectations (Machine Learning Engineer, Onsite) Context: You are interviewing for an onsite Machine Learning Engineer role. The intervie...
Design a product notifications system
System Design: Push Notifications and In‑App Messaging Platform Context Design a notifications platform for a large consumer mobile app with millions ...
Count words in a document robustly
Given a text document, return the number of words under a precise definition. First, state the tokenization rules you will use (e.g., treat contractio...
Design file deduplication across nested directories
Design and implement a file deduplication tool that, given a root directory, identifies groups of duplicate files. Requirements: traverse nested direc...