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."
Implement a key-value CRUD store
Implement an in-memory key–value store that supports create, read, update, and delete operations. Expose APIs such as put(key, value), get(key), updat...
Answer behavioral prompts for quant internship
Answer behavioral prompts for quant internship Behavioral and Leadership Prompts for a Data Scientist Take‑home Context You are applying for a Data Sc...
Address miscommunication and alignment
Address miscommunication and alignment Behavioral: Handling Miscommunication and Alignment in a Technical Screen Context: You are in a software engine...
Explain motivation, UX quality, and change handling
Explain motivation, UX quality, and change handling Behavioral & Leadership Technical Screen (Software Engineer) Context You're interviewing for a Sof...
Troubleshoot a production incident end-to-end
Troubleshoot a production incident end-to-end Incident Troubleshooting: Intermittent Failures and Elevated Latency in Transfers Context A microservice...
Validate course catalog dependencies
Design a function to validate an e-learning course catalog. You are given: ( 1) a set of course IDs, and ( 2) a list of prerequisite pairs (u, v) mean...
Design document editor with undo/redo and batching
Design a document-editing layer that supports applying edits and undo. Implement an API with apply(Operation op), undo(), and getText(). Then add tran...
Parallelize the lock BFS safely
Parallelize the lock BFS safely Parallelizing BFS for the Rotating-Lock Problem Context You are given the classic rotating-lock problem (e.g., a 4-whe...
Solve rotating-lock BFS with blockers
You are given a 4-digit lock starting at "0000". In one move, you may pick a single position and rotate it +1 or −1 with wrap-around (0→9 on −1, 9→0 o...
Solve linked list, top-K, and string reduction
Solve linked list, top-K, and string reduction Solve the following algorithmic tasks: 1) Given a singly linked list, return the k-th node from the end...
Describe Java 8 features
Describe Java 8 features What are the key new features introduced in Java 8? Explain when and how you would use lambda expressions, the Stream API, Op...
Describe diving deep into a problem
Describe diving deep into a problem Behavioral: Dive Deep to Resolve a Complex System Issue Prompt Describe a situation where you had to dive deep int...
Respond to negative feedback and exceed requirements
Respond to negative feedback and exceed requirements Behavioral Question: Negative Feedback and Going Beyond Requirements Context: Software Engineer —...
Design duplicate-file detection using size
You are given a large POSIX-like filesystem containing millions of files across nested directories. Design an algorithm to find groups of duplicate fi...
Design query generation to maximize CTR
Design query generation to maximize CTR Design an end-to-end query-generation system that maximizes click-through rate (CTR) for a large-scale search/...
Design an Animal Chess OOP simulation
Design and implement a simplified Animal Chess (Dou Shou Qi) game using object-oriented principles. Include: 1) Piece classes Elephant, Lion, Tiger, L...
Solve transaction aggregation and search tasks
Solve transaction aggregation and search tasks Complete the following coding tasks: (a) Given a list of transactions, each with userId and amount (cre...
Design a least-recently-used cache
Design a least-recently-used cache Design and implement a least-recently-used (LRU) cache with a fixed capacity. Support get(key) -> value and put(key...
Analyze time and space complexity
Analyze time and space complexity For any algorithm you implement, analyze its time and space complexity using Big-O notation. Derive and justify the ...
Implement sliding-window moving average
Design a class MovingAverage that supports a constructor MovingAverage(k) and a method next(val) returning the average of the last k values from a dat...