Engineering High-Concurrency Live Streaming Applications
Live streaming applications like Twitch, TikTok Live, and Bigo Live require specialized distributed network architecture to achieve sub-second latency for millions of simultaneous viewers.
Core Architectural Components
1. Ingestion & Transcoding: Broadcasters publish video streams via RTMP or WebRTC to media edge servers (e.g. AWS MediaLive, Ant Media, or Janus WebRTC). The stream is dynamically transcoded into multi-bitrate HLS / WebRTC chunks.
2. Low-Latency Distribution: Leveraging CDN edge nodes to deliver glass-to-glass latency under 350 milliseconds worldwide.
3. Real-Time Chat & Virtual Gifting: Redis Pub/Sub combined with high-throughput WebSocket microservices to broadcast millions of chat messages and animated gift transactions per second without lagging the video stream.
Recommended Tech Stack
- Frontend: Flutter (Mobile) + Next.js (Web Portal)
- Real-time Video: WebRTC, RTMP, Agora SDK, AWS Interactive Video Service (IVS)
- Backend: Go / Node.js Microservices
- In-Memory Cache: Redis Enterprise Cluster
- Database: PostgreSQL for transactional data + Cassandra/ScyllaDB for chat history