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."
Solve linked list, string filtering, and puzzle
This multi-part question evaluates proficiency with linked-list pointer manipulation and constant-space linear-time algorithms, pattern-driven string ...
Design a weighted random value generator
This question evaluates understanding of weighted random sampling, probability-proportional selection, data structures for aggregating weights, and AP...
Find median of merged RLE arrays
The question evaluates understanding of run-length encoding, order-statistics (median) computation, and efficient merging of frequency-annotated seque...
Implement iterator merging lists with filtering
This question evaluates iterator/generator design, sequence merging, stateful filtering and deduplication, checking a candidate's ability to maintain ...
Find linked merchants by shared fields
This question evaluates the ability to model and detect entity linkages via exact field matching and weighted scoring as well as to reason about reach...
Device Status without Timestamps
Table: article_views article_id INT author_id INT viewer_id INT view_dt DATE Count authors who have never viewed any of their own articles. On 20...
Implement lazy array and KV store
This question evaluates understanding of lazy evaluation and functional transformation chaining for a LazyArray alongside in-memory data structure des...
Check equal character frequencies
This question evaluates a candidate's understanding of character frequency analysis and algorithmic reasoning in string manipulation, measuring the ab...
Answer trader-style behavioral and motivation questions
You are interviewing for a trading/quant role. Prepare strong answers to the following behavioral prompts: - Why this firm? Why this role/team? - What...
Find expected tosses to see a coin pattern
A fair coin is tossed repeatedly until a target length-3 pattern appears as a consecutive substring (e.g., HHH, HTH, HTT, etc.). 1) Describe a general...
Design a tagging system and REST APIs
Design a tagging system (similar to tagging pages/issues) with a strong focus on REST API design. Functional requirements: - Create a tag. - Rename a ...
Implement agent voting with average and sorting
Design an in-memory “agent voting” module that records ratings agents give to items (e.g., tickets/articles). Requirements: - Each vote is: (agentId, ...
Design a food ordering and delivery system
This question evaluates a candidate's ability to design scalable, reliable backend systems including API design, data modeling, state management, disp...
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...