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."
Find shortest path in an OOP maze
This question evaluates graph traversal and shortest-path reasoning within an object-oriented codebase, focusing on state representation, neighbor exp...
Add two binary strings
This question evaluates proficiency with binary arithmetic and string manipulation, focusing on carry propagation and handling of very long inputs wit...
Compute minimum meeting rooms on circular day
This question evaluates a candidate's ability to reason about interval scheduling, circular time wrap-around, and resource allocation for overlapping ...
Generate all subsets (handle duplicates)
This question evaluates understanding of power-set generation and handling of duplicate elements, measuring competency in combinatorics, enumeration t...
Reconstruct original array from doubled shuffle
This question evaluates array manipulation, multiset/frequency reasoning, pairing logic, and careful handling of edge cases such as zeros and negative...
Define and estimate prevalence of unhealthy users
This question evaluates a data scientist's ability to operationalize an "unhealthy user" metric and compute its prevalence from session duration and d...
Derive a CDF from a PDF
This question evaluates a candidate's understanding of the relationship between probability density functions and cumulative distribution functions, i...
Solve Three OA Coding Tasks
This set of problems evaluates string and array manipulation, spatial placement and packing logic, and parity-based subarray counting within the Codin...
Compute shortest path in cyclic graph
This question evaluates understanding of graph algorithms and shortest-path computation in weighted directed graphs, including handling cycles, non-ne...
Derive the Long-Run Sex Ratio Under a Stopping Rule
Assume each child is independently equally likely to be a girl or a boy. Every family continues having children until its first boy, then stops. For a...
Validate Password Against Multiple Rules
This question evaluates string processing and input validation skills, specifically character-class checks, frequency constraints, and enforcement of ...
Compute root-to-leaf number sum
This question evaluates understanding of binary tree data structures and the competency to aggregate values along root-to-leaf paths, combining tree t...
Design a fraud mitigation strategy under constraints
You are given a one-page case during a hiring manager round for a Fraud Data Scientist role. Current state: - The existing fraud model is performing p...
Refactor a chat message processing function
This question evaluates a candidate's ability to refactor and implement clear, maintainable message-processing logic—covering code organization, comma...
Design a 3-day online donation system
This question evaluates a candidate's ability in large-scale web system design, focusing on reliable payment integration, idempotency and consistency ...
Compute dasher pay with peak-hour query
This question evaluates a candidate's ability to perform time-interval arithmetic, prorated pay aggregation, robust handling of missing or inconsisten...
Check whether an integer is a power of two
This question evaluates proficiency in bit-level reasoning and integer arithmetic, specifically understanding binary representations and the propertie...
Explain LLM training and evaluation
LLM Engineering: Training, Alignment, Hallucination Reduction, Evaluation, Monitoring, and Inference Optimization Context You are designing, aligning,...
Design a product notifications system
System Design: Push Notifications and In‑App Messaging Platform Context Design a notifications platform for a large consumer mobile app with millions ...
Handle last-minute track change
Behavioral Question: Switching Tracks Mid-Interview Loop You are midway through a software engineering onsite when the interview focus changes (e.g., ...