SLC

01Overall project details

Project SLC is a premium, high-performance communication suite designed to provide secure, real-time connectivity across mobile platforms. It serves as a unified ecosystem for instant messaging, high-fidelity video conferencing, and "World Calls"—a specialized integration that bridges digital VOIP with traditional PSTN (Public Switched Telephone Network) lines. By leveraging a distributed serverless architecture, SLC ensures sub-100ms latency for messaging while providing enterprise-grade security and a credit-based global calling system.

02Target audience

• Privacy-Conscious Individuals

  Users seeking a secure, encrypted alternative to mainstream messaging apps for personal data protection.

• Global Travelers & Expats

  Individuals needing a reliable, low-cost way to call international phone numbers (PSTN) directly from a mobile app.

• Small to Mid-Sized Teams

  Organizations requiring a private, branded communication tool for internal chat and video coordination without the overhead of enterprise bloat.

03User experience & workflow

The platform is built around a "Connectivity First" philosophy, ensuring that users can transition from a simple text chat to a high-definition video call or a global phone call with a single tap.

04Technical architecture

Project SLC utilizes a Hybrid Serverless Architecture . The frontend manages the heavy lifting of media rendering and real-time state synchronization, while the backend is orchestrated through Firebase Cloud Functions and specialized communication providers.

05Developer role & focus

• Real-time Synchronization

  Implementing Firebase RTDB for instantaneous messaging, typing indicators, and online presence tracking.

• High-Fidelity Media

  Orchestrating GetStream and Twilio SDKs to handle adaptive bitrate video and crystal-clear audio conferencing.

• Secure Billing Logic

  Developing robust Firebase Cloud Functions to handle PSTN call initiation and atomic credit deductions.

• Push Notification Pipeline

  Engineering a dual-path notification system (Expo + Direct FCM) to ensure message delivery in background states.

07Communication structure

The platform ensures a fluid experience by using Realtime Database for UI-facing events and Cloud Functions for complex backend orchestration.