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 DoorDash Marketplace Experiments
This question evaluates a data scientist's competency in experiment and quasi-experiment design, causal inference, metric definition, and judgment abo...
Explain LLM tuning and transformer basics
Answer the following machine learning questions: - Describe a project where you fine-tuned a large language model or another large foundation model. E...
Discuss Projects, Failures, and Growth
Prepare structured answers for the following behavioral prompts from an interview: - Describe the project you are most proud of. - What was the hardes...
Optimal Commute: Nearest Transit Distance in a City Grid
This question evaluates a candidate's ability to apply multi-source breadth-first search to a grid-based shortest-path problem. It tests graph travers...
Evaluate Dating App Product Changes
This question evaluates a data scientist's competency in experimentation design, causal inference, metric specification, and marketplace-aware product...
Design a Scalable Job Scheduler
Design a job scheduler for a small startup, then explain how you would evolve it to support roughly 100x more scheduled tasks. The system should: - Al...
Describe conflict resolution and initiative
The behavioral round reportedly consisted of 7-8 standard questions. A polished version of the expected prompts would be: - Tell me about a time you h...
Answer leadership scenarios about influence and integrity
Answer the following behavioral questions with concrete examples (use STAR: Situation, Task, Action, Result): 1. Describe a time you convinced others ...
Implement a Cloud Storage Service
Implement an in-memory cloud storage system. Build the class incrementally; later levels must preserve all behavior from earlier levels. File names ar...
Explain OS processes, threads, and memory
Explain OS processes, threads, and memory Explain core operating system concepts: processes vs threads, context switching, and scheduling (preemptive ...
Compute decay, OLS, and classic probability results
You are asked several probability/statistics questions. 1) Radioactive decay (half-life) A radioactive atom has a half-life of 1 day. Assume each atom...
Compute credit-card portfolio profit and breakeven
A bank is evaluating a new credit card. Segments: A: 30,000 customers, capture rate 20%, avg annual spend per captured customer = $100,000. B: any pop...
Influence policy with BI deliverables
BI/Fraud Stakeholder Case: Drive an Account Takeover (ATO) Policy Change in 90 Days You join the Chicago Fraud team as a Decision Scientist. The hirin...
Solve three algorithmic OA tasks
Solve three algorithmic OA tasks Task 1 (Odd-frequency string): Given an integer N in [1..200000], write an algorithm that returns any length-N string...
Repair Unsafe C++ Ownership with Smart Pointers
Repair Unsafe C++ Ownership with Smart Pointers Review this ownership sketch: `cpp class Engine { public: void start(); }; class Controller { ...
Explain CPU-Bound vs I/O-Bound Work
Define CPU-bound and I/O-bound workloads. Then compare how multithreading, asynchronous I/O, and multiprocessing behave for each type of workload, esp...
Design an ACL authorization checking service
This question evaluates system design and security architecture skills, focusing on centralized authorization/ACL models, API and data modeling, cachi...
Introduce yourself for a senior role
Prompt You’re interviewing for a senior engineering role. 1. Give a concise self-introduction (2–3 minutes). 2. Highlight 1–2 impactful projects, your...
Choose Optimal Network Retry Threshold
You work on a mobile music streaming team responsible for improving playback reliability while minimizing battery drain. When the app is streaming aud...
How would you define and use retention metrics?
Scenario You are a Data Scientist supporting a consumer product (app or website). A PM asks you to “dive deep” on user retention and recommends tracki...