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 Concurrent Key-Value Store with Batch Writes
Design a Concurrent Key-Value Store with Batch Writes Design the core implementation of an in-memory key-value store for concurrent callers. For this ...
Design a Fraud Detection System
Design a machine learning system for a fintech data-connectivity platform such as Plaid that detects fraudulent activity across the user lifecycle — b...
Design a geography-aware virtual card service
This question evaluates a candidate's ability to design secure, low-latency, geography-aware payment systems, covering distributed systems architectur...
Check Whether Two Strings Are Anagrams
Problem Implement are_anagrams(a, b). Return true exactly when a and b contain the same lowercase English letters with the same multiplicities, possib...
Design a user behavior tracking system
Problem Design a User Behavior Tracking System that collects and analyzes user events from mobile and web applications across multiple products. The s...
How to debug a Python loop-condition bug
You are given a Python script that appears to hang or produce incorrect results because of a bug in a loop condition (e.g., while/for termination logi...
Estimate weather’s effect on mental health
This question evaluates causal inference and applied statistical modeling skills—specifically defining outcomes and treatments, addressing confounding...
Externally Sort a 500 GB CSV by One Column with 16 GB of RAM
This question evaluates a candidate's ability to design an external merge sort for data far larger than available memory, a core systems design skill....
Design a Scheduler for ML Training and Batch Inference Jobs
Design a Scheduler for ML Training and Batch Inference Jobs Design a scheduler for machine-learning compute jobs. Focus on training and batch inferenc...
Design a Read-Once Chat System
Design a chat messaging system where one sender can select multiple recipients at send time, but the message is not a group chat message. Instead, the...
Find and Fix C++ Ownership Bugs: Double Free, Shallow Copy, and Object Slicing
This question evaluates a candidate's understanding of C++ object lifetime, copy semantics, and polymorphism. It tests the ability to spot shallow-cop...
Design a CI/CD pipeline with scheduler
Design a production-grade CI/CD pipeline (with its job scheduler) You are designing the internal CI/CD platform for a large engineering organization t...
Validate AI-Generated Code Safely
This question evaluates experience with generative AI tools and the competency in validating AI-generated code for correctness, maintainability, and s...
Design Multi-Dimensional Request Rate Limiting
This question evaluates proficiency in designing distributed rate limiting systems, including API and data model design, consistency and scalability t...
How would you forecast bike demand?
This question evaluates a candidate's competency in time-series forecasting, feature engineering, model selection, and evaluation for short-horizon de...
Design a Collaborative Todo List
Design a collaborative todo-list service — think shared lists where teammates add, edit, assign, reorder, and complete items, and see each other's cha...
Handle Island Counting When the Grid Does Not Fit in Memory
Prepare for a Bytedance software engineering interview question about handle island counting when the grid does not fit in memory. The prompt highligh...
Fix the Password Reset Workflow
This question evaluates debugging and software engineering fundamentals around authentication flows, including verification code generation and expiry...
Find the Minimum Processing Rate to Meet a Deadline
Find the smallest integer processing rate that completes independent workloads before a deadline when unused hourly capacity cannot be shared. The pro...
Convert Stack Samples into Trace Events
Convert Stack Samples into Trace Events The source reports converting sampled call stacks into trace events but does not provide the exact tuple forma...