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."
Compute expected max/min of n die rolls
You roll a fair six-sided die n times independently. 1) Compute the expected value of the maximum roll. 2) Compute the expected value of the minimum r...
Explain and compute option delta
In options trading, what is an option’s delta? 1) Give the definition of delta and explain its intuition/sign for calls vs puts. 2) Under the Black–Sc...
Return right and left side views of a tree
This question evaluates understanding of binary tree data structures and the competency to identify side views by reasoning about which node is visibl...
Find Any Local Minimum with Iterative Binary Search
Find Any Local Minimum with Iterative Binary Search Given a nonempty integer array numbers, return the index of any local minimum. An index i is a loc...
Return Binary Tree Nodes in Vertical Order
Return Binary Tree Nodes in Vertical Order A binary tree has nodes numbered from 0 through n - 1, with node 0 as the root. Arrays left and right conta...
Merge Three Sorted Arrays Without Duplicates
Merge Three Sorted Arrays Without Duplicates You are given three integer arrays sorted in nondecreasing order. Merge them into one sorted array that c...
Compare queueing systems and common distributions
LinkedIn Data Scientist Statistics Fundamentals You are asked a series of statistics fundamentals questions in a data science technical screen. Constr...
Design experiment for bike delivery feature
You work on a delivery marketplace (customers, merchants, couriers). The company is considering launching a “bike delivery” capability in a subset of ...
Define metrics for new market expansion success
DoorDash new-market expansion analytics prompt covering marketplace health metrics, demand and supply diagnostics, guardrails, 6-month evaluation plan...
Maximize area between vertical lines
This question evaluates algorithmic reasoning with arrays and the ability to optimize pairwise measurements, specifically assessing understanding of h...
Navigate conflict, difficult people, and culture issues
Answer the following behavioral questions with clear examples (preferably using the STAR method: Situation, Task, Action, Result). Be explicit about y...
Investigate Harassment Surge and Mitigation
Question You work on content integrity. Your monthly moderation analysis shows that the Harassment violation type increased sharply in the most recent...
Design a web search engine pipeline
Design the high-level pipeline of a web search engine. Assume you need to support internet-scale search (billions of web pages) with low-latency queri...
Find Maximum Unique-Character Subset
This question evaluates algorithm design and combinatorial optimization skills, specifically the ability to model disjoint-character constraints, hand...
Implement Validation and String Compression
This question evaluates string processing, input validation, tokenization, hierarchical string manipulation, and algorithmic complexity analysis skill...
Evaluate AI-assisted ad creation
This question evaluates a candidate's competence in product analytics, causal inference, experimentation design, metric definition, and monitoring for...
Count ways to make change (DP)
This question evaluates understanding of dynamic programming and combinatorial counting, focusing on unbounded coin usage and counting order‑independe...
Compute exclusive CPU time from nested logs
You are given logs from a single-threaded CPU that runs n functions (IDs 0 to n-1). Each log entry is a string in the format: - "functionId:start:time...
Simulate meeting-room bookings and return busiest room
This question evaluates a candidate's competence in scheduling and resource-allocation algorithms, focusing on simulation of interval-based bookings, ...
Design a client-side comment system
Scenario You are asked to build a client-side comment system (no backend required). The focus is on data modeling, UI behavior, and persistence. Requi...