VTuber Live Broadcasting

• Built a real-time communication engine from scratch for VTuber live real-time broadcasting, powering an app featuring a well-known Japanese voice actress idol group.

Development

• Built a VTuber live-specified real-time communication engine from scratch and original R&D
• Full stack delivery: from the backend io_uring-based network engine to the C# library for Unity
• Recording server, archive streaming, and playback features

Results

• Achieved low latency with 1,500+ concurrent connections per CPU core even in complex live scenarios, with about 192 KB/s of traffic per connection
• Maintained zero server failures since launch, supporting daily regular cast broadcasts and major live events
• Entered production in H1 2025

Technology

• Go, C#, io_uring

This project was built end-to-end from the network infrastructure to the client SDK, delivering a high-performance real-time communication system tailored to the business requirements.