Engineering / Free editable template

SaaS architecture diagram template

A SaaS architecture diagram gives new engineers, investors and security reviewers the same picture of how the product is built. This layered example shows a typical B2B stack, from web and mobile clients through the edge and application services down to the data stores, with payments, email and monitoring as third parties.

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SaaS architecture diagram example showing client, edge, application and data layers, services behind an api gateway and auth service, third parties such as payments and email
Everything in this example is editable. Replace the labels, move the shapes and adapt the layout to your work.

How to use this template

  1. Keep the layers, change the boxes

    Rename each box to match your stack, for example a different cache or a managed queue. The layers stay useful because readers find a component faster when they know which layer to look in.

  2. Draw only the main request paths

    Show the arrows a typical request follows and leave out every internal call. A diagram with every connection becomes unreadable; that detail belongs in a separate diagram for each service.

  3. Match it to its audience

    For a security review, add where data is encrypted and which services hold personal data. For a pitch deck, collapse the application layer into one box and keep the third parties.

Questions about this template

What if we don't use an API gateway?

Delete the gateway box and connect the load balancer straight to your services. The client, edge, application and data layers still work as they are.

Do I need an account to use it?

No. Open the template and edit it in your browser. Your work saves on this device. An account is optional if you want to sync your workspace.

Can I export the finished diagram?

Yes. Use Export in the editor to save a PNG, SVG or PDF, or download an editable .epicdraw backup.

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