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."
Determine allow/deny for an IP via CIDR rules
This question evaluates understanding of IPv4 addressing, CIDR range matching, rule ordering and precedence, and algorithmic correctness in determinin...
How do you handle conflict and ambiguity?
You are asked a series of detailed behavioral questions. Answer each with specific context, actions, and measurable outcomes. Conflict, teamwork, and ...
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...
Apply operations efficiently using Command pattern
This question evaluates skills in object-oriented design, the Command Pattern, correctness reasoning, extensibility of operation abstractions, and opt...
Extend and optimize an existing CLI tool
This question evaluates a candidate's ability to analyze an existing CLI codebase, perform gap analysis versus requirements, implement missing feature...
Find first and last occurrence in sorted array
This question evaluates proficiency in array search algorithms and algorithmic reasoning, specifically the use of binary search techniques and careful...
Implement multi-head attention and LLM sampling
This question evaluates implementation and conceptual understanding of Transformer multi-head scaled dot-product attention and next-token sampling for...
Design a news aggregator like Google News
This question evaluates a candidate's competency in designing scalable, low-latency distributed systems for content aggregation, personalization, and ...
Design hit counter for last 5 minutes
You are launching a new webpage and need a last-minute server-side metric to track popularity in real time. Implement a hit counter that supports the ...
Describe toughest project experience
Behavioral Question Describe the toughest experience you had on a project you worked on. Include: - The project context and your role/responsibilities...
Map Weighted Random Draws to Indices
Map deterministic draws to weighted indices using cumulative ranges. Support large weights and many queries while preserving draw order and respecting...
Find Intersections Between Two Interval Lists
Find every non-empty intersection between two sorted lists of disjoint closed intervals. Preserve ascending order and correctly include intersections ...
Find User Airport at a Time
This question evaluates the ability to model and query time-interval flight data for multiple users, testing skills in data structures, sorting and se...
Solve Refueling and JSON Parsing Tasks
This multipart question evaluates algorithmic problem-solving and parsing competencies, specifically resource-optimization and data-structure use for ...
Design Personalized Promotion Recommendations
This question evaluates a candidate's ability to design end-to-end machine learning recommendation systems, covering competencies such as data collect...
Design a 911 emergency calling service
System Design Prompt Design a 911 emergency calling service (or emergency call routing platform) that allows users to place emergency calls from mobil...
Contrast processes and threads
What are the differences between processes and threads? Compare memory isolation, resource ownership, scheduling, context-switch cost, inter-process c...
Explain arrays and memory layout
What is an array? How is an array represented in memory (contiguous layout, element size and alignment, indexing arithmetic). Analyze time complexitie...
Design a customer LTV prediction system
System Design: End-to-End ML for Customer Lifetime Value (LTV) Context You are designing an end-to-end machine learning system to estimate customer li...
Compute specialty spend share and top age band
You are given healthcare claims data split across member tables. Tables Assume the following schemas (types may be adapted to your SQL dialect): mem1 ...