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."
Demonstrate project impact and teach something
In a hiring-manager or behavioral interview: 1. Pick one recent project and explain: - the problem and why it mattered, - your role and scope, ...
Model ads demand data for reporting
This question evaluates competencies in data modeling, ETL/ELT pipeline design, analytics warehousing, handling slowly changing dimensions, and high-v...
Solve Wonderful Strings and Grid Queries
This question evaluates algorithm design and data-structure competencies through two problems: a parity-constrained minimum-cost string transformation...
Design a Top-K search words service
Scenario Design a service that tracks user search queries and returns the Top-K most searched words/queries. Requirements Functional - API to record a...
Group words that map to same phone digits
Problem On a classic phone keypad (T9), letters map to digits: - 2: ABC, 3: DEF, 4: GHI, 5: JKL, - 6: MNO, 7: PQRS, 8: TUV, 9: WXYZ Given a list of lo...
Explain a project to non-technical stakeholders
You are speaking to a non-technical audience (e.g., business stakeholder, operations team, or a friend with no engineering background). Describe one p...
Write SQL for repeat churn
Write a SQL query to measure the performance of a free-month promotion experiment. Assume experiment_users already contains only users who were eligib...
Design short-video retrieval with sparse text
You are designing the candidate-generation (retrieval) and recommendation system for a short-video app. Constraints and setting: - Users can search wi...
Design an image-to-multilanguage translator
This question evaluates a candidate's ability to design a scalable, low-latency system for processing images with OCR and multilingual translation, ex...
Implement a Cursor-Based Text Editor
This question evaluates understanding of data structures and algorithmic efficiency for mutable sequences and cursor manipulation, including analysis ...
Return the Vertical Traversal of a Binary Tree
Return the Vertical Traversal of a Binary Tree Problem Implement verticalTraversal(nodeValues, left, right, root) -> columns. Node root is at row 0, c...
Design a Reliable URL Shortening Service
Design a Reliable URL Shortening Service Design a service that accepts a long URL and returns a short URL, then redirects short-code requests to the s...
Design a News Aggregation Feed
Design a large-scale news aggregation feed similar to a major news app. The system ingests a large volume of raw news articles from many sources, incl...
Analyze homepage drop and feed ranking
You are interviewing for a product data science role at LinkedIn. Answer the following two product-sense questions. 1. Diagnose a drop in Home Page ->...
Explain your LLM project and contributions
Prior Experience Deep Dive (LLM) You mentioned you previously worked on an LLM-related research/project. Explain: - What problem you were trying to so...
Design a lead-scoring model
Question You are interviewing for a Data Scientist role on a marketing/growth team. Sales has limited outreach capacity, so the business wants a lead-...
Design a donations service with 3-day rolling totals
Design a service that ingests donations and serves rolling 3-day donation totals. Requirements Core features 1. Ingest donation events: - Each dona...
Design and explain your project architecture
Question Pick one of your recent projects and walk an interviewer through its architecture end-to-end. Sketch a high-level diagram, then go deep on th...
How do you test two variants vs control?
You ran an A/B/n experiment with 1 control and 2 treatment variants. The primary metric is conversion rate (each user either converts or not within th...
Debug and scale a PyTorch training loop
You are given a PyTorch training script for a CIFAR-10 image classifier that either: - does not converge (accuracy stays near random), or - becomes un...