master areas · section 5
Architecture & Technical Design
The system-side craft.
Where the prediction is given technical shape. Constrained choices become ADRs. Sequence, schema, and API contracts become the trio's shared drawings. Ilities are selected, not assumed. Spike management is a discovery practice, not a delay.
Primary owner: Tech Lead. Primary volumes: III — Scope & Shape and IV — Execution.
Crafts in this section
| Craft | Owner | Volume |
|---|---|---|
| Sequence Diagrams | Tech Lead | III |
| Schema Design | Tech Lead | III |
| API Contract Design | Tech Lead | III |
| Architecture Decision Records | Tech Lead | III |
| Domain Modelling | Tech Lead | III |
| Bounded Context Mapping | Tech Lead | IV |
| Service Composition | Tech Lead | IV |
| State Machine Design | Tech Lead | III |
| Data Flow Design | Tech Lead | III |
| System Architecture (C4 / arc42) | Tech Lead | III |
| Ilities Selection | Tech Lead, PO | III |
| UX/Product Ilities | Designer, PO | III |
| Spike Management | Tech Lead | III |
| Integration Design | Tech Lead | IV |
| Migration Design | Tech Lead | IV |
| Performance Engineering | Tech Lead | IV |
| Security Architecture | Tech Lead | IV |