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 notification system
System Design: Multi-Channel Notification Platform Context Design a multi-tenant notification platform that delivers messages across email, SMS, and m...
Explain gap and project contributions
Behavioral/Technical Screen: Recent Work and Project Deep-Dive Context You are in a technical screen for a Software Engineer role. The interviewer wan...
Compute task order and layered execution
You have N tasks labeled 0..N-1 and prerequisite pairs (a, b) meaning task a must complete before task b can start. Return any valid execution order o...
Validate a Parent-Child Forest
This question evaluates understanding of graph theory concepts—specifically rooted trees, parent-child relationships, cycle detection, and node in-deg...
Find the Longest Consecutive Path in a Binary Tree
Given a binary tree, return the length of the longest downward path where each child value is exactly one greater than its parent value. Nodes have va...
Debug distributed-system performance problems
You are asked: “If a distributed system has a performance problem (latency/throughput regression), how would you approach it?” Describe a practical, s...
Design a replicated key-value store with quorums
Design a distributed system that replicates key–value pairs across multiple replicas. The interviewer wants to focus on replication, quorums, and fail...
Design a Personalized News Feed Aggregator
Design a personalized news-feed system that ingests articles from many sources and builds a home feed. Users may follow topics and sources. A new user...
Merge two sorted linked lists
This question evaluates proficiency with linked list data structures, pointer manipulation, in-place merging concepts, and algorithmic efficiency with...
Design photo and listing quality models
This question evaluates competency in machine learning product design and engineering, encompassing labeling strategy, feature engineering, model sele...
Prepare For An Applied Science Manager Project And Leadership Screen
Prepare for a phone screen for an applied science manager role. The interview includes a project deep dive on search ranking and a leadership section ...
Fetch, group, and print paginated activities
Fetch, group, and print paginated activities Given a paginated API that returns (totalCount, activities[]) for a requested page, implement code that i...
Design a scalable tagging system
Design a scalable, multi-tenant tagging system that lets users attach multiple tags to arbitrary resources ("items") and query them efficiently. The s...
Determine if a 14-tile hand is winning
You are given an integer array tiles of length 14 representing a Mahjong-like hand. Each integer is a tile value from 1 to 9 (single suit). You may re...
Vertical Order Traversal of a Binary Tree
Vertical Order Traversal of a Binary Tree You are given the root of a binary tree. Return the vertical order traversal of its nodes' values — that is,...
Convert a Roman Numeral to an Integer
Convert a Roman Numeral to an Integer Roman numerals are written with seven symbols, each with a fixed integer value: | Symbol | Value | |--------|---...
Find gaps between intervals
You are given a list of integer intervals intervals, where each interval is represented as [start, end] (inclusive), and start <= end. Two intervals m...
Design a container image registry
This question evaluates a candidate's competency in designing large-scale distributed systems for artifact storage and delivery, including storage arc...
Implement Optimal Bucket Batching
You are given an array lengths of K document lengths and an integer G representing the number of available GPUs. A batch is assigned to one GPU, and e...
Design a fair event registration queue API
This question evaluates a candidate's ability to design an in-memory, FIFO event registration service using object-oriented design, testing knowledge ...