GrowthDay Platform
The problem
GrowthDay needed to go from early MVP to a production-grade personal development platform. There was no mobile app, no scalable content delivery, and no monetization layer. The architecture needed to support rapid feature growth without accumulating fatal tech debt.
What I built
Built the React Native mobile app from scratch, establishing patterns for the content player, offline support, and notifications - shipped to iOS and Android within the first quarter.
Designed and owned the content delivery layer: Wistia-backed video, course progression tracking, and a media player that worked reliably on both mobile and web.
Implemented the payments system across Stripe (web) and Apple IAP (iOS), including subscription management, proration handling, and billing recovery.
Led Brendon AI, a real-time coaching avatar with personalized recommendations and RAG-backed growth plans on top of GrowthDay's content catalogue. Also built an in-house AI feedback engine that surfaces signal for product and marketing teams.
Built the live coaching stack on WebRTC + HLS. Scaled 1:1 / group rooms and 1-to-many sessions to 10,000+ concurrent viewers.
Built an internal AI workflow that triages crashes from Crashlytics + Datadog, attempts fixes, and opens PRs automatically.
Outcomes
- 400K+ active users across web and mobile
- 4.8★ rating on iOS App Store
- 0.0001% crash rate across iOS and Android
- 10,000+ concurrent live coaching viewers
- +9% payment conversion from mobile wallets
- Full product team scaled and self-sufficient at handoff
Highlights
- Primary engineer across mobile (iOS, Android) and web for a personal development platform from early-stage to 400K users.
- Owned every product surface: course library, media player, live coaching, Brendon AI coaching avatar, journaling, community, and payments.
- Scaled live coaching to 10,000+ concurrent viewers on WebRTC + HLS.
- Built Brendon AI - coaching avatar with personalized RAG growth plans and an in-house AI feedback engine for product, marketing, and support signal.
- Shipped Stripe + Apple Pay + Google Pay payments - mobile wallets lifted conversion 9%.
- Hired and scaled the mobile team from 0 to a multi-person engineering team.
- Maintained 0.0001% crash rate across iOS and Android - backed by an AI agent that triages crashes and opens fix PRs automatically.
- Shipped every major product milestone from initial launch through sustained growth.