Chen Cong Email & Phone Number

Beijing, China

Beijing, China

Key Responsibilities:1. Architecture Migration: Migrated the company's legacy audio and video architecture to a WebRTC-based architecture. Optimized various products such as small classes, dual-teacher classrooms, and large lecture classes. Enhanced small classes from supporting 8 participants to 16; upgraded dual-teacher classrooms from a maximum resolution of 1080P to 4K; and reduced live streaming latency for large lecture classes from 3-5 seconds to 30 milliseconds to 1 second. During peak times, handled concurrency of 500,000 to 1 million users, and scaled up by approximately 10 times during the pandemic, as reported in related news.2. Employee Training: Conducted internal training on WebRTC-related technologies to develop WebRTC talent within the company. Transitioned all live streaming and real-time communication projects to WebRTC technology.3. Dynamic Scaling Strategies for Online Education: Designed dynamic scaling strategies to save server resources in online education scenarios. Post-optimization, server resource usage was reduced by 70% during non-peak periods.

Beijing, China

Responsible for Streaming Server Development, Distributed Architecture, and Multi-Platform SDK Design and DevelopmentKey Responsibilities:1. Multi-Platform SDK Design and Development: Designed and developed SDK interfaces for Web, Android, and iOS platforms.2. Proprietary Penetration Server: Developed a proprietary implementation of STUN and TURN protocols in Go, based on standard RFCs, to address the issue of traffic monitoring which open-source servers could not solve.3. Distributed Architecture Design: Designed a global distributed architecture based on NATS and heartbeat mechanisms, effectively addressing client access issues and enabling horizontal scalability of servers, while also providing a certain level of disaster recovery capability.