SkyLine Call

SkyLine Call is a cross platform messaging and voice and video calling app. I led the original VoIP platform and its evolution into a chat based product across web and Android, and later took ownership of the client's React Native rebuild when the previous developer left without a handover.

The handover audit found the live database rules set to allow read and write for anyone on the internet. I closed that the same day and verified anonymous access was blocked, then documented and fixed four further HIGH severity issues in the backend before the app kept shipping.

• 37,794 lines, 33 screens, 28 services, 14 stores
• Production database open to the internet, closed and verified the same day
• Token impersonation, call eavesdropping, caller ID spoofing and unsigned webhooks found and fixed