scope-appropriate-architecture

Installation
SKILL.md

Scope-Appropriate Architecture

Right-size every architectural decision to the project's actual needs. Not every project needs hexagonal architecture, CQRS, or microservices.

Core principle: Detect the project tier first, then constrain all downstream pattern choices to that tier's complexity ceiling.


The 6 Project Tiers

Tier LOC Ratio Architecture DB Auth Tests
1. Interview/Take-home 1.0-1.3x Flat files, no layers SQLite / JSON None or basic 8-15 focused
2. Hackathon/Prototype 0.8-1.0x Single file if possible SQLite / in-memory None Zero
3. Startup/MVP 1.0-1.5x MVC monolith Managed Postgres Clerk/Supabase Auth Happy path + critical
4. Growth-stage 1.5-2.0x Modular monolith Postgres + Redis Auth service Unit + integration
5. Enterprise 2.0-3.0x Hexagonal/DDD Postgres + queues OAuth2/SAML Full pyramid
6. Open Source 1.2-1.8x Minimal API surface Configurable Optional Exhaustive public API
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Mar 11, 2026