Designing a Birthday App (Like a PM at Google Would)
Google asked this PM Question
Source: Exponent
Most people either forget birthdays, send last-minute texts, or scramble to buy a gift they’re not sure the other person will like.
Let’s design an app that helps people celebrate birthdays thoughtfully, without stress.
The Problem
People want to remember and celebrate birthdays meaningfully, but current tools are fragmented or impersonal.
The app’s goal is to help users:
Remember important birthdays
Celebrate in a more personal and organized way
Coordinate with others when needed
Who This App is For
Everyday users who want timely reminders and thoughtful ways to show they care
Gift senders looking for ideas and convenience
People being celebrated who want to feel remembered
Friend groups or families that want to plan something together
What the App Does
Input Sources
Syncs with contacts, calendars, and social accounts
Lets users manually add birthdays and preferences
Collects context like past gifts, favorite items, or locations
Core Features
Smart Reminders: Timely nudges, with context (e.g., "You forgot last year")
Gift Suggestions: AI-curated ideas based on recipient profile
Event Planning: Invite people, set a date, track RSVPs
Pre-made Wishes: Send voice, video, or text greetings quickly
Group Gifting: Easily split payments and track contributors
Optional Add-ons
Calendar sync
Personalized timeline with past celebrations
History of sent wishes and gifts
Key Trade-offs
Privacy vs. Personalization: Accessing contacts and preferences vs. keeping data secure
Feature richness vs. simplicity: Avoiding clutter while still offering value
Notification engagement vs. fatigue: Striking the right frequency and tone
Success Metrics
Retention during key birthday weeks
Number of wishes sent or gifts purchased
Frequency of group events created
Net Promoter Score (NPS) after the event
Organic invites to others via shared events or gift planning
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