PBX

3CX is an enterprise unified communications platform combining VoIP telephony, WebRTC, live chat, CRM integrations, call routing, and AI-powered automation into a single communications ecosystem used by more than 350,000 organizations worldwide.

As a key contributor, I work across the WebClient, PBX backend, Call Control API, LiveChat, and AI initiatives, delivering production features spanning real-time communications, conversational AI, telephony infrastructure, and platform integrations.

Modern unified communications platforms operate as distributed real-time systems where telephony, WebRTC sessions, browser clients, backend services, CRM integrations, and AI services continuously exchange state. Maintaining low-latency call processing, reliable state synchronization, responsive user experiences, and long-term maintainability while the platform continuously evolves remains a fundamental engineering challenge.

As enterprise communication platforms expand, the call lifecycle itself becomes increasingly programmable. Caller verification, IVR automation, AI voice agents, knowledge retrieval, and customer-specific business workflows all become part of the same real-time execution pipeline. Supporting these capabilities without continuously embedding new logic into the PBX requires scalable integration models, clear architectural boundaries, and independently evolving execution layers.

My work on the core platform spans both the real-time WebClient and the PBX behind it. On the client side, I re-architected the RxJS call-state pipeline, reducing median update latency from ~250 ms to ~120 ms while improving consistency across heterogeneous data sources. On the platform side, I contributed to the first generation of AI Voice Agents by implementing user impersonation, AI-driven call workflows, RAG capabilities, and integrations with multiple AI providers, alongside lower-level features such as phonetic contact matching (Levenshtein and phonetic similarity) to improve recognition accuracy. In parallel, I helped modernize the frontend through the AngularJS → Angular migration and the LiveChat migration from Vue 2 to Vue 3.

As a key contributor to 3CX's programmable call processing ecosystem, I focus on enabling increasingly sophisticated call workflows to execute outside the PBX while remaining seamlessly integrated with production telephony. Depending on the scenario, this ranges from customer-specific automation and business workflows built on the Call Control API to AI-powered call processing and, ultimately, the Voice Agent Orchestrator, where complete conversational AI runtimes become first-class participants in the live call lifecycle while remaining independently deployable from the communications platform.