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Google interview notes, page 94 of 215

FAANG / Big Tech

Most of these Google write-ups come from Software Engineers (1,167), then Product Managers (686) and Data Scientists (125). The most reported rounds are the product sense round (667), the technical phone screen (660), the behavioral / leadership round (252) and the onsite coding round (214).

2146 interview notes · updated Oct 2026

Google·Software Engineer·Onsite - Product Sense / Strategy

May 2026
Interviewed at Google for a marketing role, question was around campaign duration. Not a lot to go on from this one.
  • How would you determine the optimal duration for a marketing campaign?

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Google·Machine Learning Engineer·Technical Phone Screen

May 2026
Google ML engineer coding round, basically a graph traversal problem dressed up as an island counter. Not the most exotic thing I've seen but still had to think carefully about the BFS vs DFS tradeoff under pressure.
  • Given a 2D binary grid where 1s represent land and 0s represent water, count the number of islands, where an island is a group of land cells connected horizontally or vertically.

“Went with DFS, marked visited cells in-place by flipping 1s to 0s.”

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Google·Product Manager·Onsite - System Design / Architecture

May 2026
Google PM interview, one question about a login endpoint. Pretty technical for a PM role, which I wasn't fully expecting.
  • Walk me through the design of a login endpoint in detail.

“I started with the basics, POST request, credentials in the body, server validates against a hashed password in the DB, returns a token.”

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Google·Software Engineer·Onsite - Behavioral / Leadership

May 2026
Google SWE behavioral round, just the one question about complex systems. Pretty low-key as far as Google interviews go.
  • Tell me about the most complex system you have worked on.

“I went with a distributed data pipeline I'd built, which felt like the right call, but I rambled way too much about the architecture and not enough about my actual decisions and tradeoffs.”

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Google·Software Engineer·Technical Phone Screen

May 2026
Google SWE interview with a string indexing problem that sounds deceptively simple until you start thinking about the multi-digit case.
  • You're given a string of pi's digits. Using 1-based indexing, find all indices i where the substring of pi starting at position i (with length equal to the number of digits in i) matches i itself. Return the full list of such indices.

“The single-digit case is fine, you just check pi[i] == i and move on.”

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Google·Product Manager·Onsite - Product Sense / Strategy

May 2026
Interviewed at Google, got hit with a big-picture strategy question about the company's future. Not much else to go on, but it was the kind of thing that sounds easy until you're actually sitting there trying to say something that doesn't sound like a Wikipedia summary.
  • How do you think Google can stay relevant over the next decade?

“I rambled about AI and search and then kind of circled back to advertising revenue like that was a fresh take.”

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Google·Software Engineer·Technical Phone Screen

May 2026
Google SWE interview with a tree problem. Pretty standard algorithmic round, nothing too wild, but the question had more edge cases than I initially gave it credit for.
  • Given a binary tree, determine whether it is a complete binary tree.

“My first instinct was to do a level-order traversal and check for gaps.”

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Google·Software Engineer·Onsite - Behavioral / Leadership

May 2026
Behavioral round at Google for a software engineering role. Just one question but they really wanted you to dig into specifics, not just give a vague answer about teamwork.
  • Tell me about a time you showed leadership on a project, including how you worked with teammates to get through a real challenge.

“They kept pushing for specifics.”

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Google·Product Manager·Onsite - Product Sense / Strategy

May 2026
PM interview at Google with a classic product strategy question about one of their flagship products. Not a lot of context to go on, but the question itself is the kind that sounds easy and then completely humbles you once you start talking.
  • Why does Google Maps exist, and what are its key opportunities and threats?

“I started with the obvious stuff, navigation and local search, and immediately felt like I was just describing the product back to them.”

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Google·Product Manager·Onsite - Product Sense / Strategy

May 2026
Got a product sense question at Google about mobile search, specifically around running A/B tests on the homepage to drive more search traffic. Short post, not much context around the round or outcome.
  • What A/B tests would you design and run on Google's mobile homepage to increase search traffic?

“This one sounds deceptively simple and I kind of walked into that trap of listing random UI tweaks without anchoring to a hypothesis first.”

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