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 a Payment Orchestration System
Design a Payment Orchestration System Design the merchant-side service that coordinates payment authorization, capture, refund, and status tracking th...
Design an Evaluation Platform for a Design-Editing Agent
Design an Evaluation Platform for a Design-Editing Agent A design application includes an agent that edits a user's document from natural-language ins...
Reduce Cold-Food Incidents with Metrics and an Insulated-Bag Experiment
Reduce Cold-Food Incidents with Metrics and an Insulated-Bag Experiment A delivery marketplace wants to reduce the support costs, credits, and refunds...
Implement a Consistent Hash Ring
Implement a Consistent Hash Ring Design a consistent-hashing component that maps arbitrary keys to backend nodes and minimizes remapping when nodes ar...
Reason About an Intercept Shift in Logistic Regression
Reason About an Intercept Shift in Logistic Regression A trained binary classifier produces p(x) = sigmoid(w^T x + b) and predicts the positive class ...
Design a Governed Agent for Portfolio Rebalancing
Design a Governed Agent for Portfolio Rebalancing Design an agentic architecture that can propose and, when authorized, execute portfolio rebalancing....
Design an Audit Logs Service
This question evaluates the ability to design a scalable, multi-tenant audit logging system, covering event storage, tamper-evident retention, and eff...
Design a Read- and Write-Heavy Product Catalog Service
Design a Read- and Write-Heavy Product Catalog Service Design a service in which merchants create and update product listings while users browse and v...
Allocate IPO Shares and Split a Weighted Tree
Two Allocation and Tree Problems Implement both independent parts. Part A - IPO Share Allocation Each bid is [user_id, requested_shares, price, timest...
Design a Distributed Key-Value Store
This system design question evaluates the ability to architect a horizontally scalable distributed key-value store, covering data partitioning, replic...
Design a Distributed Rate-Limiting Service
Design a Distributed Rate-Limiting Service Design a rate-limiting service that protects APIs across many application instances. It should support per-...
LLM Foundations: Architecture, Adaptation, and Steering
This question evaluates a candidate's conceptual understanding of large language model architecture, adaptation, and inference-time control. It probes...
Compute entropy and implement 1-NN
You are given two short ML coding problems from a machine-learning engineer screen. Both are implementation-focused but probe whether you understand t...
Sliding Window Average After Dropping the Largest Values
Compute one average per fixed-size sliding window after removing exactly the largest k values, counting duplicates separately. Support negative number...
Design a Stateful Outreach Campaign Engine
Design an internal campaign engine that lets an agent select a custom subset of clients and start an outreach campaign for each selected client. For e...
Architect an AI Chatbot for Enterprise Users
Architect an AI chatbot for enterprise users over internal knowledge and tools. `hint Hint 1 Start by stating assumptions, then work from requirements...
Implement a Recoverable In-Memory Key-Value Store
Implement a Recoverable In-Memory Key-Value Store Design and implement a single-process key-value store whose working set is held in memory and whose ...
Explain Why You Want This Company and Infrastructure Role
Explain Why You Want This Company and Infrastructure Role Explain why you want to join the company and why an infrastructure-focused software engineer...
Harden a URL-Caching HTTP Service for Production
Harden a URL-Caching HTTP Service for Production You inherit a working HTTP service that accepts URL-related requests and keeps cached URL records in ...
Design a Concurrent, Memory-Bounded Tally Service
Design a Concurrent, Memory-Bounded Tally Service Design and implement the core of a TallyService with two operations: - bump(timestamp): record one e...