3 Things I Learned Scaling Pinterest's Ad Platform
Lessons from coordinating iOS, Android, and Backend teams to deliver features for 500M+ users.
After leading cross-functional teams at Pinterest, three patterns consistently drove success:
1. API Contracts First — Mobile and backend teams align on contracts before implementation. This eliminates late-stage integration surprises and enables parallel development.
2. Feature Flags Are Non-Negotiable — With 500M+ users, every release needs a kill switch. Gradual rollouts (1% → 10% → 100%) catch issues before they become incidents.
3. Cross-Platform Parity Matters — iOS and Android users expect identical experiences. We maintained feature parity checklists and shared test cases between platforms.