# Multica Backend Impl

> Backend implementation skill—API / data model / business logic coding conventions and acceptance checklist; the preferred mount for @BackendDev.

- Skill: `it235/multica-backend-impl` (Agent Skill)
- Install (CLI): `npx skillmds@latest add it235/multica-backend-impl`
- Raw SKILL.md: https://api.skillmd.com/api/skills/it235/multica-backend-impl/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: AI & ML
- Author: it235 (https://skillmd.com/u/it235)
- Updated: 2026-09-22
- Page: https://skillmd.com/skills/it235/multica-backend-impl

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# Backend Implementation (backend-impl)

## Responsibility
As @BackendDev, implement backend code (API / data model / business logic) per the architect's technical design, then push the contract to `backend-artifact` via `multica-artifact-backend`.

## Conventions
- Follow the module/package layout agreed in `multica-artifact-architect`.
- API contracts (path/params/response) must match the design exactly.
- Business logic must cover the AC-derived edge cases.

## Acceptance checklist
- [ ] API contract matches design (no silent field changes)
- [ ] Data model migration is reversible
- [ ] Error codes/responses are documented
- [ ] Unit tests cover core logic

## Flow
1. Implement per design.
2. Self-check against the checklist.
3. Push contract to `backend-artifact` (`multica-artifact-backend`), then hand off to @Tester (API automation) and @Reviewer.