SHELF
3M+
Users
500K
Daily active users
Industry
Social Media
Location
US / International
Scope
Mobile App
Overview
Securing and optimising authentication for a hyper-growth social app
Description
Shelf is a mobile app offering a new kind of social network: a feed based on the cultural content users consume (Netflix, Prime Video, Apple Music, Goodreads…), connecting people with shared interests. GettingApp stepped in to secure, stabilise and optimise the entire mobile authentication chain.
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Challenge
As Shelf was growing rapidly, it faced a critical issue with its authentication stack — built on Supabase with OTP via Twilio — leading to extremely high SMS costs, significant fraud exposure, and poor onboarding visibility.
What we delivered
authentication
- –Integration of a new authentication provider (Prelude)
- –Mobile SDK and OTP authentication server setup
- –Fine-grained fallback and edge case management (QA, test numbers, simulated errors)
anti fraud
- –Country-level blocking
- –Intelligent SMS routing
- –VPN / IP range detection
- –Device fingerprinting
- –IP ↔ phone number country code consistency checks
monitoring
- –Real-time Grafana dashboards
- –OTP conversion rate tracking
- –SMS sent vs. validated metrics
- –Automatic anomaly detection
Results
- ✓SMS costs reduced from $20–25k/month to ~$5k/month
- ✓Secure and controlled onboarding
- ✓Full visibility on authentication performance
- ✓Ability to anticipate and block attacks before impact
Key differentiators
- →Fast intervention on a critical growth bottleneck
- →Strong expertise in mobile authentication
- →Drastic reduction of operational costs
- →Proactive fraud prevention
- →Precise monitoring via real-time metrics
- →Combined product and security approach
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