We served as frontend architect for CellTrust SL2 — an enterprise-grade secure communications platform featuring a web-based VoIP client, real-time encrypted chat, and a modular frontend architecture built for extensibility.
The challenge
CellTrust Corporation needed to deliver a web-based enterprise communications platform that met the demanding security and reliability standards of their regulated industry clients — financial institutions, government agencies, and healthcare organizations. The platform required browser-based VoIP calling with the audio quality and reliability of native applications, real-time messaging with minimal latency, and an architecture that could support future feature expansion without destabilizing existing functionality. The existing codebase lacked modern build tooling, making development slow and deployment risky.
Our solution
We designed and built the frontend architecture for SL2 using AngularJS with a modular, component-based structure that allowed new communication features to be added independently. We engineered a fully functional VoIP web client using WebRTC with Asterisk as the media server, delivering enterprise-quality voice calls directly in the browser without plugins. Real-time chat was implemented using SignalR for persistent, low-latency bidirectional communication. We overhauled the build system by introducing Webpack, replacing fragmented manual processes with automated bundling, minification, and code-splitting — dramatically improving both development velocity and deployment reliability.
Results
- Delivered fully functional browser-based VoIP client using WebRTC and Asterisk
- Engineered real-time encrypted chat system powered by SignalR
- Designed modular frontend architecture supporting independent feature deployment
- Modernized entire build system with Webpack, eliminating manual build processes
- Served regulated enterprise clients including financial and government organizations