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 Tree Operations with DFS and BFS
Design an object-oriented tree class with several operations that require DFS and BFS traversal. Explain the node model, traversal APIs, and how you w...
Sliding Window Average After Dropping the Largest Values
Compute one average per fixed-size sliding window after removing exactly the largest k values, counting duplicates separately. Support negative number...
Parallelize Blocking API Calls with a Thread Pool
Parallelize Blocking API Calls with a Thread Pool An existing function loops over a list of inputs and calls a blocking API once per input. Replace th...
Select the Nearest Eligible Elevator
Select the Nearest Eligible Elevator You are given a list of elevators. Each elevator has a current integer floor and a state: "up", "down", or "idle"...
Model and Solve a Rectangular Jigsaw Puzzle
Model and Solve a Rectangular Jigsaw Puzzle Design an object-oriented model for a rectangular jigsaw puzzle and outline an algorithm to solve it. Use ...
Design User and Item Embeddings from Long Histories
Design User and Item Embeddings from Long Histories Design an embedding system that represents users and visual-content items for retrieval or recomme...
Design and Implement a URL Shortening Service
Design and implement a URL shortening service in a combined whiteboarding and implementation interview where AI assistance may be allowed. `hint Hint ...
Evaluate a Live-Stream Group Notification Under Network Effects
Prompt A social travel app wants to add a notification: “Someone in one of your groups is live now.” The notification can increase attendance at live ...
Design Peer-to-Peer Model Distribution Under a Shared Link Cap
Design Peer-to-Peer Model Distribution Under a Shared Link Cap Design a system that distributes one large model artifact from a machine that already h...
Build a Progressive Banking Ledger
Build a Progressive Banking Ledger The source reports the four feature stages but not exact ledger semantics. The APIs, event priorities, cashback tim...
Maximal Square and Longest Increasing Subsequence
Problem Implement analyze(matrix, nums) and return [max_square_area, lis_length]. Part A: Maximal Square matrix is a rectangular grid containing only ...
Simulate a Deterministic Finite Automaton
Implement a deterministic finite automaton simulator for the alphabet {a, b}. The automaton has states numbered from 0 through stateCount - 1. The tra...
Explain Transformer Components and Tree-Ensemble Trade-offs
Explain Transformer Components and Tree-Ensemble Trade-offs A technical discussion covers two foundations: how encoder and decoder components work in ...
Design an Extensible Tax Policy Engine
Design an Extensible Tax Policy Engine You already have a correct evaluator for one progressive-bracket policy. Design the surrounding tax engine so i...
Design an Asynchronous Text-to-Video Generation Service
Design an Asynchronous Text-to-Video Generation Service Design a service in which a user submits a text prompt, the system performs a long-running vid...
Design an Idempotent Double-Entry Ledger
Design a ledger service that records financial transactions using double-entry accounting. Clients submit operations over an unreliable network and ma...
Review and Debug an AI Chatbot
Review and Debug an AI Chatbot Review the design of an AI chatbot and propose improvements. Then explain how you would investigate reports of incorrec...
Answer an LLM Systems Quick-Fire Interview
You are given a rapid-fire LLM systems interview. Be prepared to explain Transformer architecture, attention and masking, multi-head attention, normal...
Handle Cross-Functional Pushback on an Analysis
Tell me about a time a cross-functional partner pushed back on your analysis, metric, or recommendation. How did you understand the disagreement, test...
Clarify an Ambiguous Product Question and Define a Metric
A product partner asks, “Is this feature successful?” The request does not specify the user population, behavior, comparison, or decision. Walk throug...