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 Payment-Count Dashboard That Scales with Readers and Updates
Design a Payment-Count Dashboard That Scales with Readers and Updates Design a service that displays the total number of payments made on an administr...
Evaluate an Agentic Decision System End to End
Evaluate an Agentic Decision System End to End You are replacing a rule-based workflow with an agent that selects tools and recommends operational dec...
Minimum Delivery Cost Between Cities
Minimum Delivery Cost Between Cities Implement minimum_delivery_costs(delivery_charges, queries). There are n cities indexed from 0 to n - 1, and city...
Count Completed Jobs in a Serial Multi-Worker Pipeline
Count Completed Jobs in a Serial Multi-Worker Pipeline An automation pipeline contains stages that execute in order. Each stage is represented as [num...
Stand by a Disputed Technical Judgment
Stand by a Disputed Technical Judgment Prompt Describe a situation in which others believed your technical judgment was wrong, but you continued to ad...
Explain What You Seek and an Unexpected Project Outcome
Explain What You Seek and an Unexpected Project Outcome Answer two engineering-manager questions: what you are looking for in your next role, and a pr...
Prepare for a Recruiter Motivation Screen
Prepare concise, credible answers for an initial recruiter conversation for a senior engineering role. Part 1: Why This Organization Explain why you w...
Design a Centralized Logging System
Design a Centralized Logging System Design a system that collects application logs from a large fleet of microservice instances and makes them durable...
Handle Conflict, Expanded Scope, Risk, and Team Culture
Handle Conflict, Expanded Scope, Risk, and Team Culture Prepare four behavioral examples that demonstrate judgment and leadership without assuming for...
Design Chat APIs, Storage, and Core Message Flows
Design Chat APIs, Storage, and Core Message Flows Design the API and database model for a chat service. Cover direct and group conversations, sending ...
Design a Task Scheduler for Opaque Long-Running GPU Jobs ("Design Sora")
This system design question evaluates a candidate's ability to architect a distributed job scheduler and orchestrator for expensive, long-running, GPU...
Design a Hotel Search and Reservation System
Design a Hotel Search and Reservation System Design a hotel system with APIs, database schema, and query paths for property discovery, date-range avai...
Evaluate Defensive Testing and Pair Programming
An engineering interview asks you to compare two practices that aim to reduce defects: defensive testing and pair programming. Explain what each pract...
Implement an In-Memory File System
Implement an In-Memory File System Design and implement an in-memory hierarchical file system. It starts with an empty root directory and a current wo...
Find Duplicate Files with a Hand-Written Directory Traversal
Find Duplicate Files with a Hand-Written Directory Traversal Implement a duplicate-file finder starting from a root directory, but do not use a recurs...
Walk Through an Experiment From Design to Decision
Describe an experiment you designed or analyzed. Explain the decision it was meant to inform, how you chose the experimental unit and metrics, what th...
Design an Indexable Deque with O(1) Access
Design a data structure backed by a deque that supports push front, push back, pop front, pop back, and O(1) access by logical index. Explain how an o...
Select Maximum Call Stacks Across Threads
You receive a collection of sampled call stacks. Each sample contains a threadId and an ordered list of frames from root to leaf. Design an algorithm ...
Self-Attention: Implementation, Complexity, and Efficient Variants
This question evaluates a machine learning candidate's understanding of the self-attention mechanism, including its implementation, computational comp...
Minimize Fuel Cost Across Cities
Minimize Fuel Cost Across Cities Problem Hackerland has g_nodes cities numbered from 1 through g_nodes and bidirectional roads. Road i connects g_from...