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Airbnb interview notes, page 6 of 19

Large Enterprises

Most of these Airbnb write-ups come from Software Engineers (141), then Machine Learning Engineers (19) and Data Scientists (12). The most reported rounds are the technical phone screen (85), the system design round (47), the behavioral / leadership round (20) and the product sense round (13).

187 interview notes · updated Oct 2026

Airbnb·Software Engineer·Technical Phone Screen

May 2026
Airbnb software engineer interview with a simulation problem that looked deceptively straightforward on the surface. The water-pouring logic has enough edge cases to trip you up if you try to code before fully thinking through the flow.
  • Given an elevation map represented as an array of integer heights, simulate dropping V units of water at index K. Each water drop flows left as far as possible to a strictly lower position, then right if blocked, then stays at K if neither direction works. Return the resulting height array.

“I started coding way too fast and got the left-scan logic backwards.”

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Airbnb·Software Engineer·Recruiter / HR Screen

May 2026
Airbnb SWE interview with what looks like a casual icebreaker question. Not much to report here.
  • If you could travel anywhere in the world, where would you go and why?

“Pretty fitting question for Airbnb I guess.”

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Airbnb·Software Engineer·Onsite - Multi Round

May 2026
Airbnb interview that basically turned into an archaeology dig through my entire resume, including stuff I listed two jobs ago and hoped nobody would ask about. They really do read every line.
  • Walk me through every project on your resume, including older ones you only briefly mentioned. Be specific about your role, the technical decisions you made, the scope, and the results.

“This is the question that exposed me.”

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Airbnb·Software Engineer·Technical Phone Screen

May 2026
Airbnb software engineer interview with a fairly meaty algorithmic problem around refund allocation. The question had enough edge cases to keep you busy for a while, and the follow-up on complexity felt like the real test.
  • Given a list of completed payment transactions, each with a payment method, date, and amount, and a refund amount R, write an algorithm that issues refunds by always refunding one payment in full before moving to the next, preferring methods in the order CREDIT then CREDIT_CARD then PAYPAL, and within the same method refunding the most recent transaction first. Return the list of refund allocations with payment id, method, and amount. Also explain your time complexity and data structures.

“I went straight to sorting and probably over-explained it.”

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Airbnb·Machine Learning Engineer·Technical Phone Screen

May 2026
Airbnb ML Engineer interview with a coding problem that looks like a travel puzzle but is really just coin change in disguise. The decimal durations tripped me up more than the algorithm itself.
  • You have a layover of exactly X hours and a list of Airbnb experiences with decimal durations (in hours). You can book the same experience multiple times. Find the minimum number of bookings so the total duration equals exactly X hours. If it's impossible, return -1.

“The thematic wrapper fooled me for a second.”

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Airbnb·Software Engineer·Onsite - System Design / Architecture

May 2026
System design round at Airbnb for a software engineer role. The question was a full-blown notification system design covering pretty much every dimension you can think of, so it felt less like one question and more like a gauntlet.
  • Design a scalable notification system that supports email, SMS, and push channels for millions of users with low latency. Walk through requirements, architecture, data model, API design, message prioritization, deduplication, retry logic, failure handling, scaling, monitoring, and cost.

“This was a lot.”

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Airbnb·Software Engineer·Technical Phone Screen

May 2026
Airbnb software engineer interview with a string formatting problem. Pretty much a pure implementation exercise, nothing algorithmic, but the edge cases are where they actually pay attention.
  • Write a function that takes a list of sentences and a fixed width, and formats them into a bordered table with horizontal dividers between every row.

“The core part is easy enough, padding strings and slapping pipes on the sides.”

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Airbnb·Software Engineer·Onsite - System Design / Architecture

May 2026
Airbnb system design round focused entirely on a group chat product, no 1:1 messaging involved. Broader scope than I expected and the interviewer kept pushing on edge cases I hadn't thought through.
  • Design a chat system where every conversation is a group chat. Cover group creation, membership, message delivery, fanout strategy, ordering, offline sync, presence, read receipts, and storage.

“I started with the message send/receive flow which felt natural, but I underestimated how much time the fanout piece would eat up.”

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Airbnb·Data Scientist·Onsite - Cross-functional / Panel

May 2026
Cross-functional panel at Airbnb for a data scientist role, mix of product and engineering folks in the room which made it feel less predictable than a standard behavioral loop.
  • Tell me about a time you influenced a decision without having direct authority over the people involved. How did you get everyone aligned, and what actually came of it?

“I went in thinking this was a softball and kind of rambled through a story without anchoring it to any real numbers.”

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Airbnb·Software Engineer·Technical Phone Screen

May 2026
Airbnb software engineer interview with a code review exercise on a geolocation processing codebase. Pretty open-ended, which I wasn't fully prepared for.
  • You're given a Python codebase for geolocation data processing. Walk through a thorough code review covering readability, correctness, performance, and scalability, and suggest concrete improvements like better data structures, vectorization, caching, or modularization.

“This was broader than I expected.”

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