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product sense · hard

Design a travel app for Google

Design a travel app for Google.

Updated Jun 2026 Calibrated to the strong-hire bar

This is a Google product sense question, not a travel question. Interviewers are scoring your ability to pick a specific user with a specific unmet need, make a defensible prioritization call, and use Google’s actual assets rather than designing a generic app that could ship at any company. In 2026, the prompt has a second layer of difficulty: Google has already shipped a lot of this space. A strong answer names what exists and explains why the problem you are solving is still open.

What Google has already shipped (know this before your answer)

Ask Maps launched March 2026 in the US and India: Gemini-powered natural-language queries against 300M+ places, handling complex real-world travel questions directly in Maps. Immersive Navigation launched the same month: 3D driving view built from Street View and aerial imagery, showing lanes, crosswalks, and traffic lights analyzed by Gemini. Gemini trip planner integrates with Google Flights and Hotels for real-time price comparison and natural-language booking queries. Google also parses Gmail booking confirmations to surface trip summaries in Maps and Search.

Any answer that proposes “an AI that plans your whole trip” is proposing 2025. Interviewers have heard it 40 times this quarter.

Structure a strong answer

strong

"Before I pick a direction, I want to scope this carefully. Google already has Maps, Flights, Hotels, Ask Maps, and Gemini trip planning. When you say travel app, are we talking about a greenfield surface, or deepening an existing one? And are we optimizing for Maps engagement, Hotels and Flights ad revenue, or a new user behavior Google doesn't yet own?"

After scoping: "I want to focus on group travel coordination. Three to six adults trying to plan a trip together is the highest-frustration segment in travel, and no Google product today owns the coordination layer. Solo travel planning is largely solved by Gemini trip planner. Group decisions are not."

Concrete pain points for this segment: (1) Preference aggregation: everyone has veto power but there is no shared view of options. (2) Real-time replanning when something breaks mid-trip: one flight delay cascades and the group has no single source of truth. (3) Trust calibration: members don't equally trust AI recommendations, so someone always re-googles, splintering the group across WhatsApp and a shared Google Doc.

The wedge feature: a shared trip workspace that pulls Gmail booking confirmations from all participants (with explicit permission), overlays them on a shared Maps view, and surfaces Gemini-powered group decision prompts. Example: "Three of you saved this restaurant. One has a dietary restriction. Here are four alternatives that work for all of you." Disruption handling uses real-time Flights and Maps data to push proactive rerouting suggestions to all group members simultaneously when a booking changes.

Why this over other features: the Gmail parsing creates immediate value at zero additional input from the user. It is pull, not push. Users don't have to learn a new behavior or fill in a form. That is the wedge.

North star metric: trip completion rate, defined as at least one booking confirmed per participant through the shared workspace. This ties engagement to the actual job to be done and correlates directly with Hotels and Flights ad revenue. Guardrail: no increase in group members abandoning the trip because coordination overhead got worse.

On viability: group travel is a $180B+ segment globally. Google currently captures value at booking but loses users to WhatsApp group chats and shared Google Docs for coordination. Bringing coordination in-product means Google owns the full funnel and can surface relevant booking prompts at the moment of group decision, not after. That is a real revenue story, not just an engagement play.

weak

"I'd design an AI-powered travel planning app that uses Gemini to generate personalized itineraries for millennials who love to travel." This describes a product Google shipped in 2025. The segment is undefined, the pain point is generic, and the feature already exists. The interviewer stops listening here.

What else makes an answer weak: listing features (itinerary builder, hotel search, flight comparison, offline maps) without prioritizing or connecting them to a specific user's pain. Not acknowledging Google's existing assets. Setting a north star of "DAU" or "user satisfaction" with no connection to Google's business model. Proposing AI itinerary generation as the hero feature without saying what is broken about the current version and why this would be different.

The interviewer is scoring for user empathy (absent if your segment is "people who travel"), prioritization rigor (absent if you list features without cuts), trade-off reasoning (absent if you don't acknowledge what you are not building), and ecosystem leverage (absent if your answer could ship at Booking.com or Airbnb with no changes).

The 2026 reframe

Itinerary generation is commoditized. Gemini, ChatGPT, Perplexity, and Booking.com all do it. Feasibility is no longer the constraint, so a strong candidate names this explicitly: “The problem is not generating a trip plan. Every AI does that. The problem is what happens when reality diverges from the plan, and when the decision is not yours alone to make.”

The viable question is specific to Google: Google makes money when users book through Hotels and Flights. A travel feature that keeps users in a planning loop without converting to bookings is a cost center. A strong answer shows how the feature drives booking conversion, or names a monetization model (commission on bookings made through the workspace) that holds up regardless of ad revenue.

The lovable question in 2026 means the product meets users where they actually coordinate (WhatsApp and Google Docs, not a travel app), resolves problems before users have to ask, and does not spam the group with notifications about every minor change. A group travel product that notices two members’ flights land three hours apart and surfaces hotel check-in alternatives without being asked is lovable. One that pings the whole group every time a restaurant price changes is obnoxious. That distinction is a real design decision worth naming.

How Google’s 45-minute round works

Roughly five minutes of setup, thirty minutes of answer, ten minutes of Q&A. Interviewers score on: user empathy, prioritization rigor, ability to make and defend trade-offs, creativity within constraints, and Googleyness, which means using Google’s actual ecosystem rather than designing a standalone app. The clarifying questions you ask in the first two minutes signal whether you understand the ecosystem or are running a generic framework.

Framework

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