Real-Time Chat With Calls

I need a lightweight, low-latency chat solution that lets me respond to messages almost instantly and, when needed, jump straight into a voice or video call without switching apps. The calling capability is non-negotiable; everything else—from the choice of web, mobile, or desktop front-end to the back-end stack—is open as long as the final result is stable, fast, and easy to maintain.

Deliverables
• Fully functional chat interface with one-to-one and group messaging
• Built-in voice/video calling (no external window pop-ups)
• Clean, well-documented source code and simple deployment instructions

Acceptance criteria: messages arrive in under two seconds on a mid-range connection, calls connect reliably within five seconds, and the codebase passes a quick review for readability and clear separation between UI, logic, and networking layers.