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."
Implement AUC-ROC, softmax, and logistic regression
This question evaluates practical implementation skills for core machine learning components—computing AUC-ROC (including ROC point generation and han...
Design real-time crypto prices homepage
This question evaluates system design competency for real-time, low-latency data pipelines and client fanout for a crypto prices homepage, testing ski...
Design a scalable chatbot platform
This question evaluates a candidate's ability to design a scalable, production-grade chatbot platform that integrates ML-based inference, multi-turn c...
Design a food delivery system
This question evaluates system design competencies including distributed architecture, scalability, real-time event propagation, API and data modeling...
Identify a classic bagging algorithm
Identify a classic bagging algorithm Multiple choice: Bagging Which of the following algorithms is a classic example of bagging (bootstrap aggregating...
Maximum-Length Unique-Character Subset
This question evaluates a candidate's ability to combine bitmasking with backtracking or subset enumeration to maximize a constraint over combinations...
Word Search in a Letter Grid
This question evaluates a candidate's ability to search for multiple target words within a grid of letters using depth-first traversal and backtrackin...
Path Resolution with Symbolic Links
This question evaluates a candidate's ability to implement filesystem-style path resolution, including handling relative and absolute paths, dot compo...
In-Memory Key-Value Database with Nested Transactions
This question evaluates a candidate's ability to design a data structure that layers transactional state over a committed base, testing skills in nest...
Compute top-K branches by openings
Compute top-K branches by openings Given a stream of account-opening events (branch_id, user_id, timestamp), design algorithms and data structures to ...
Generate Per-Position Guess Feedback
This question evaluates string-processing skills, array manipulation, and handling of duplicate character counts to produce per-position feedback. It ...
Explain C printf pointers and memory layout
You are given the following C code: `c const char *c = "12345"; ` Answer the following (assume typical modern 64-bit Linux/macOS with GCC/Clang, unles...
Implement a Composable Event Recommendation Engine
This question evaluates a candidate's skills in software design and implementation for recommendation systems, focusing on modular object-oriented arc...
Design Identity & Trust Experiment
This question evaluates a data scientist's experimental design and causal inference skills, specifically A/B testing methodology, metric selection, po...
Design an ads ranking system with calibration
This question evaluates a candidate's ability to design scalable, low-latency online machine learning systems for ads ranking, covering competencies i...
Solve OA tasks on string, grid path, subarrays
This multi-part question evaluates string manipulation, constrained grid-path optimization with sequential expression evaluation, and counting of pari...
Trace first pass of heap sort
Given the integer array [7, 6, 3, 5, 4, 1, 2], you apply heap sort to sort it in ascending order using a max-heap implementation. After building the i...
Implement sampling and subarray algorithms
Solve uniform 2D square sampling and longest increasing contiguous subarray. The solution maps Uniform(0,1) to Uniform(-1,1), proves uniformity by ind...
Navigate a Senior Engineering HR Interview
Navigate a Senior Engineering HR Interview Prepare a coherent set of answers for an HR conversation covering current scope, motivation, company intere...
Implement A Concurrent Download De-Duplication Layer
Design and implement a downloader that accepts many URL download requests concurrently. Requests for different URLs should run independently. If sever...