API

Realtime Chat API

A horizontally scalable realtime chat API with presence, typing indicators, and delivery guarantees — shipped as a multi-tenant SDK.

Node.jsRustRedisPostgreSQLWebSocket

Kode Sumber Demo Langsung

Challenge

A customer-facing chat product needed a backend that scales to millions of concurrent connections without losing presence or delivery.

Approach

A Node.js edge layer terminates WebSockets; a Rust core handles fan-out over Redis pub/sub with sharded presence. PostgreSQL stores persistent history; delivery uses at-least-once acks with dedup. A multi-tenant SDK abstracts the wire protocol for app teams.

Outcome

Sustained load tests at 1.2M concurrent connections per shard.
Presence lag under 100ms p99.
SDK adoption removed per-app backend work for four product teams.