Design a Real-Time Bidding System — Sub-100ms Latency at Scale
RTB system design. Latency budget breakdown, candidate generation, ranking, fraud, billing, and the operational realities of a sub-100ms decisioning pipeline.
Real-Time
FastAPI WebSockets and Real-Time in 2026 — Production Patterns
Production WebSocket patterns in FastAPI: connection management, auth, scaling beyond one process, broadcast via Redis Pub/Sub or NATS, and the gotchas that bite.
Design Google Docs / Collaborative Editing — System Design Walkthrough
End-to-end design for a collaborative editing system. Operational Transformation vs CRDTs, presence, cursors, persistence, conflict resolution, and the realities at scale.
SSE vs WebSockets in 2026 — Streaming AI Apps, Chat, and Real-Time UIs
A practical comparison of Server-Sent Events and WebSockets in 2026. The protocol differences, AI token streaming, chat with cancellation, code in FastAPI, Hono, and Axum, scaling and CDN/proxy behavior, and a clear decision rule.