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."
Describe a memorable bug and persuasion story
Behavioral Questions Q1: Most memorable bug Tell me about the most memorable/impactful bug you encountered in your work experience. - What was the use...
Count Good Numbers up to a Limit
Count Good Numbers up to a Limit A positive integer is good when all of the following hold: 1. Its decimal representation contains no digit 0. 2. No d...
Find the Longest Momentum-Aware Water Path
Find the Longest Momentum-Aware Water Path Given an m × n integer height grid, find the maximum number of cells in a valid path. A path may start at a...
Plan a major database version upgrade
You have an application tier (API/web servers) talking to a primary database for writes and a secondary/replica database for reads. You need to perfor...
Describe a challenging recent project
Behavioral Tell me about a challenging and interesting project you worked on recently. Follow-ups - What were the hardest problems you encountered? - ...
Plan QA testing for a new feature
This question evaluates competency in QA test planning, test strategy and prioritization, cross-functional coordination with development and product, ...
Design a mini compiler/interpreter
Problem Design and implement a mini compiler / interpreter for a small expression language. You are given a program as a string (possibly multiple lin...
Design a meeting room reservation API
This question evaluates a candidate's object-oriented design and algorithmic competence for building an in-memory meeting room reservation API, focusi...
Simulate sticky load balancer with shutdown
Problem Implement a simulator for a load balancer that routes long-lived WebSocket connections across m backend servers. You receive a sequence of tex...
Deep-dive a project and show ownership
You will be asked to do a deep dive on one or two past projects. The interviewer(s) may probe heavily on technical details and leadership behaviors. P...
Optimize a dispatcher’s scheduling data structures
Algorithmic analysis / code review: Dispatcher for memory-constrained scheduling You are given a single-threaded in-memory dispatcher that reacts to t...
Design a Slack-like messaging system
This question evaluates a candidate's ability to design scalable, highly available real-time messaging platforms, testing competencies in distributed ...
Parse code into operation triads IR
Problem: Operation-Triads Parsing (Mini Language) You are given a small, line-based programming language consisting of assignment statements and non-n...
Design a RAG system for vehicle documents
Design a Retrieval-Augmented Generation (RAG) architecture to power a Q&A chatbot over vehicle documentation. Document types & characteristics - Sourc...
Compute minimum sample size for A/B test
You are implementing a function to compute the minimum total sample size for an A/B test. You are given: - observed: a 1D array of historical/baseline...
How do you win project buy-in?
Answer the following behavioral questions: 1. Describe a time when you proposed a project or technical initiative and convinced your manager and other...
Design a personal finance aggregator
System Design: Personal Finance Aggregation Platform (Mint-like) Context Design a consumer-facing platform that aggregates a user's financial data acr...
Estimate Causal Impact Using Synthetic Control Methods
Estimate Causal Impact Using Synthetic Control Methods A product feature has already launched to 100% of traffic, and no explicit control or holdout g...
Analyze A/B Test Results to Inform Stakeholder Decisions
Analyze A/B Test Results to Inform Stakeholder Decisions You receive raw log-level event data from an A/B test on a consumer booking funnel. You must ...
Design a Dependency-Aware CI/CD Pipeline
Design a dependency-aware CI/CD platform that schedules DAG jobs on isolated runners and preserves logs, artifacts, and durable execution state. Addre...