2nd Phone: Virtual VoIP & SMS Service
A scalable VoIP and SMS service providing virtual phone numbers for voice calls and messaging
2025
Backend Developer
About This Project
Designed and developed a scalable RESTful API using Node.js and TypeScript to provide VoIP and SMS capabilities via virtual phone numbers, with real-time communication and dynamic billing.
Technologies
Node.jsTypeScriptTwilio APITwiMLSocket.ioRevenueCatAPNsRESTful API
Key Features
●Designed and developed a scalable RESTful API using Node.js and TypeScript to provide VoIP and SMS capabilities via virtual phone numbers
●Implemented core functionality for users to provision numbers through Twilio and utilize them for voice calls, SMS, and MMS services
●Architected a webhook-driven system using Twilio API and TwiML to orchestrate real-time voice sessions and instant messaging flows
●Developed a dynamic billing engine integrated with RevenueCat that calculates national/international rates and enforces balance security via a time-limit mechanism
●Leveraged Socket.io to establish a low-latency, real-time communication layer for call state synchronization and instant notifications
●Integrated Apple Push Notification Service (APNs) to handle both VoIP Push and standard push notifications, ensuring high reliability for incoming events
