SOLID principles for Go 1.23+. Files < 100 lines, interfaces separated, modular architecture. Modules MANDATORY.
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references/architecture-patterns.mdreferences/dependency-inversion.mdreferences/interface-segregation.mdreferences/liskov-substitution.mdreferences/open-closed.mdreferences/single-responsibility.mdreferences/solid-principles.mdreferences/templates/error.mdreferences/templates/handler.mdreferences/templates/interface.mdreferences/templates/module.mdreferences/templates/service.mdreferences/templates/test.mdProvides UI/UX resources: 50+ styles, color palettes, font pairings, guidelines, charts for web/mobile across React, Next.js, Vue, Svelte, Tailwind, React Native, Flutter. Aids planning, building, reviewing interfaces.
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Builds 3-5 year financial models for startups with cohort revenue projections, cost structures, cash flow, headcount plans, burn rate, runway, and scenario analysis.
Before ANY implementation, use TeamCreate to spawn 3 agents:
Before writing ANY new code:
internal/core/services/, internal/core/ports/internal/core/| Layer | Location | Max Lines |
|---|---|---|
| Handlers | internal/modules/[feature]/handlers/ | 50 |
| Services | internal/modules/[feature]/services/ | 100 |
| Repositories | internal/modules/[feature]/repositories/ | 100 |
| Ports (interfaces) | internal/modules/[feature]/ports/ | 30 |
| Models | internal/modules/[feature]/models/ | 50 |
| Shared | internal/core/{services,ports,models}/ | - |
NEVER use flat internal/ structure - always internal/modules/[feature]/
| Rule | Value |
|---|---|
| File limit | 100 lines (split at 90) |
| Handlers | < 50 lines, delegate to services |
| Interfaces | ports/ directory ONLY |
| Godoc | Every exported function documented |
| Accept interfaces | Return structs |
| Small interfaces | 1-3 methods max (Go idiom) |
| Topic | Reference | When to consult |
|---|---|---|
| SOLID Overview | solid-principles.md | Quick reference |
| SRP | single-responsibility.md | Fat structs |
| OCP | open-closed.md | Adding providers |
| LSP | liskov-substitution.md | Contracts |
| ISP | interface-segregation.md | Fat interfaces |
| DIP | dependency-inversion.md | Injection |
| Architecture | architecture-patterns.md | Hex/modular |
| Template | When to use |
|---|---|
| module.md | Feature module structure |
| service.md | Business logic service |
| interface.md | Port definition |
| handler.md | HTTP handler |
| error.md | Custom errors |
| test.md | Table-driven tests |
| Anti-Pattern | Fix |
|---|---|
| Files > 100 lines | Split at 90 |
| Interfaces in impl files | Move to ports/ directory |
| Fat interfaces (4+ methods) | Split into small interfaces |
Flat internal/ structure | Use internal/modules/[feature]/ |
init() for dependency wiring | Use constructor injection |