Beauty Diagram
Use case

Architecture review diagrams

Prepare system, service, sequence, and data diagrams for architecture reviews without manually redrawing every box and arrow.

The goal is not to rewrite the diagram from scratch, but to make the source easier to present and reuse.

At a glance

A scenario page for teams presenting system boundaries, dependencies, and tradeoffs in architecture review meetings.

Who this is forBest diagram typesOpening the review with a C4 contextWorkflow
Rendered proof
Architecture review flow for a checkout service.
Theme · Brutalist
Open this diagram in editor
CORE FLOW FANOUT OUTCOME YesNo CUSTOMER SUBMITSCART CHECKOUT SERVICE VALIDATE SESSION CREATE PAYMENTSESSION CREATE PENDINGORDER DECISION Paymentconfirmed? FULFILL ORDER RETRY OR CANCEL
View Mermaid sourcePlain-text diagram syntax — copy or edit directly.
diagram.mmd
1flowchart TD
2  Customer[Customer submits cart] --> Checkout[Checkout service]
3  Checkout --> Auth[Validate session]
4  Checkout --> Payment[Create payment session]
5  Checkout --> Order[Create pending order]
6  Payment --> Webhook{Payment confirmed?}
7  Webhook -- Yes --> Fulfill[Fulfill order]
8  Webhook -- No --> Retry[Retry or cancel]
Pre-rendered examples

Theme and animation variants

Rendered proof
The same review prepared as a C4 system context — platform boundary, owned systems, and external dependencies called out for the room.
Theme · Slate
Open variant in editor
Commerce platform [SYSTEM] System context — checkout platform review Checks out via[HTTPS]Payment session + webhook confirmation[HTTPS]Creates order[gRPC]Reads and writes[SQL]Requests fulfilment[API] Customer Buys through web and mobile Checkout Service Cart, payment session, ordercreation Order Service Order lifecycle and fulfilment Order Store Orders and payment state Payment Provider Authorises and captures payments Warehouse System Picks and ships orders

Who this is for

Staff engineers, tech leads, and architects who need diagrams that communicate service boundaries and dependencies quickly in review sessions.

  • System context and container views
  • Dependency and integration flows
  • Data model snapshots

Best diagram types

Flowcharts establish the system path, sequence diagrams show runtime behavior, ER diagrams explain storage shape, and state diagrams clarify lifecycle changes. For the opening slide of the review, a C4 system context diagram sets the scene: the platform boundary, the systems your team owns, and the external dependencies the decision has to respect.

Opening the review with a C4 context

Most review meetings lose ten minutes re-establishing what the system even is. A C4 system context diagram answers that up front — one boundary around what the team owns, external systems dashed at the edges, and every integration labelled with its protocol. Declare it in Mermaid with Person / System / System_Ext and a System_Boundary, and the same source renders both the context slide and, zoomed in with C4Container, the deep-dive slide — no redrawing between zoom levels.

  • One boundary, owned systems inside, external dependencies dashed outside
  • Label every relationship with its protocol — reviewers argue about integrations, not boxes
  • Keep the context to one slide; switch to a container diagram for the deep dive

Workflow

Draft the diagram as Mermaid or PlantUML, beautify it into a cleaner review artifact, then export a version that fits slides or architecture docs.