Scalable Real-Time Infrastructure
Real-time features are straightforward to demo. They're hard to make reliable at scale. The gap between "it works with 10 users" and "it works with 10,000 users" is significant, and most platforms either don't bridge it or bridge it late and expensively.
We built the scalable version first.
The Scaling Challenge
Real-time requires maintaining a persistent connection from the server to every connected client. Each connection is lightweight, but thousands of them held simultaneously adds up. More importantly, propagating a change to the right subset of connected clients requires fast, accurate routing — which client is viewing which record, which list, which workspace?
Naive implementations route changes to all clients, or route via a central broker that becomes a bottleneck. Neither scales well.
The Architecture
The real-time infrastructure uses a distributed routing model. Each server node maintains an index of which clients are connected to it and what they're interested in — which records, which lists, which workspaces. When a change occurs, it's published to a lightweight message layer, and each server node determines locally which of its connected clients needs to be notified.
No central bottleneck. Each node handles its own clients independently. Adding more server capacity adds more real-time capacity proportionally.
Connection Resilience
Network connections fail. Clients go offline and come back. Real-time infrastructure needs to handle reconnection gracefully — delivering changes that occurred while a client was disconnected, without flooding the client with stale or duplicate updates.
On reconnection, clients receive a minimal catch-up payload: only the changes relevant to what they were viewing, covering the gap since their last connection. No full page reload, no duplicate notifications.
The Result for Users
Real-time that works reliably regardless of how many other users are active. No degradation during peak hours. No "real-time is temporarily unavailable" messages. Just live updates that work the same at noon on a busy Tuesday as they do at 2am.
Infrastructure that earns the name.