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."
Explain Vector, Linked List, and Polymorphism
In a C++ interview, explain the differences between a dynamic array container such as std::vector and a linked-list-based container such as std::list....
Recover a Rooted Tree from Depth-Annotated Preorder
Recover a Rooted Tree from Depth-Annotated Preorder A rooted, ordered tree was serialized by preorder traversal. Before each node value, the serialize...
Design an unsafe content detection system
This question evaluates a candidate's competency in end-to-end machine learning system design for unsafe user-generated content detection, covering mu...
Design a single- and multi-threaded web crawler
Web Crawler (single-threaded, then multi-threaded) You are given: - A starting URL startUrl (e.g., "http://news.example.com/a/index.html"). - An inter...
Return the Most Frequent Integer with a Stable Tie-Breaker
Return the Most Frequent Integer with a Stable Tie-Breaker Given a nonempty integer array, return the value that appears most often. If several values...
Describe a Favorite Project and Its Hardest Technical Challenge
Describe a Favorite Project and Its Hardest Technical Challenge Prompt Tell me about a project you are especially proud of or enjoyed working on. Expl...
Design Internal Chat and Re-engagement Emails
Design an internal chat system for an event marketplace company. Requirements: - Employees can send and receive one-to-one messages in real time. - Cl...
Lane-Change Safety and Longitudinal Motion Simulation
This question tests practical application of kinematics, feedback control, and object-oriented design in a real-time simulation context. It evaluates ...
Design loan application system
Design an End-to-End Loan Application Platform You are a software engineer at a small lending startup. Design a scalable, compliant loan origination s...
Explain Your Experience and Interest in Tech Role
Explain Your Experience and Interest in Tech Role Scenario Initial HR screening call for a TikTok Data Scientist internship/full-time role. The recrui...
Design a digital game shop backend
This question evaluates system design skills including transactional data modeling, API design, service decomposition, and reliability concerns for mo...
Explain storing files to disk with concurrency
This question evaluates systems programming concepts (OS I/O, page cache, fsync semantics) and Java concurrency mechanisms (thread-safety, synchroniza...
Design a cross-region event processing platform
Scenario Design a cross-region event processing platform that ingests events from producers, stores them durably, and delivers them to multiple consum...
Design ML system for self-driving perception
This question evaluates understanding of end-to-end ML system design for on-vehicle obstacle detection and collision avoidance, encompassing sensor fu...
Describe a major challenge you faced
In a behavioral interview for a software engineering or technical role, you are asked: > Describe the most significant challenge you have faced in an ...
Design an LLM quality validation system
You are asked to design an end-to-end LLM quality validation system for a team that trains and serves large language models. The goal is to automatica...
Design in-memory delivery billing core APIs
This question evaluates a candidate's skills in designing efficient in-memory data structures and APIs for billing scenarios, including driver and del...
Design nearest-available-taxi lookup with updates
This question evaluates the ability to design scalable, low-latency geospatial lookup services under high update and query rates, assessing skills in ...
Design Feed Ranking and HTML Generation
This question evaluates the ability to design end-to-end machine learning systems for personalized feed ranking and for natural-language-to-HTML gener...
Compute a Rolling Seven-Day Revenue Sum with Missing Dates
Solve a PostgreSQL rolling-revenue problem that needs a complete daily series per seller, including no-order dates. It assesses UTC date handling, gap...