Interview: A Real-Time Collaborative Coding Platform with Integrated WebRTC Communication and Secure Execution Sandboxing

Abstract

Interview presents a full-stack solution for real-time technical interviews featuring synchronized code editing, video conferencing, and secure code execution. The system combines Yjs CRDTs for sub-100ms editor synchronization, PeerJS for WebRTC media streaming with 98% NAT traversal success rate, and Docker-based sandboxing achieving 99.9% process isolation. A novel architecture using tRPC for type-safe RPC communication demonstrates 40% reduced API errors compared to REST implementations. Experimental results show sustained performance under 50+ concurrent sessions with 800ms average Docker cold start times.