SA Systems Atlas
A field guide to digital systems

Understand the
connections.

Networks, services and data form the foundations of digital infrastructure. Explore the principles that keep them working together.

Explore the atlas ↗
atlas / overview
$ atlas map --layers
01  networks     → paths & protocols
02  services     → boundaries & interfaces
03  data         → state & consistency
04  reliability  → signals & recovery

Clear models. Observable systems.
Built on open standards.
The foundations

Three perspectives. One system.

A practical starting point for understanding how information moves, how applications communicate and how systems evolve.

01 / NETWORKS

Paths and protocols

Addressing, routing, name resolution and transport: the layers that make communication possible.

02 / SERVICES

Useful boundaries

Interfaces, dependencies and failure modes: the decisions that shape maintainable applications.

03 / DATA

State over time

Storage, replication and consistency: the trade-offs behind durable information.

Engineering principles

Clarity before complexity.

Start with a small model. Make assumptions explicit. Observe real behavior. Design for recovery. Good infrastructure grows from understandable decisions.