System Architecture

Orbit is a multi-tenant web application built from a small set of independently deployable services.

Request flow

Browser → Web App → API Gateway → Workflow Service → PostgreSQL
                              ↘ Event Bus → Notification Worker

Components

Component	Responsibility	Owner
Web App	User interface and session handling	Atlas
API Gateway	Authentication, rate limits, routing	Comet
Workflow Service	Business rules and task state	Comet
Event Bus	Durable domain-event delivery	Beacon
Notification Worker	Email and webhook delivery	Atlas
PostgreSQL	Transactional customer data	Beacon

Design rules

• Services own their data and publish versioned events.
• APIs remain backward compatible during rolling releases.
• Customer data is encrypted in transit and at rest.
• Every critical dependency has a dashboard and alert.

Operational failures follow the incident-response guide.