eve-fullstack-app-design

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---
name: eve-fullstack-app-design
description: Architect a full-stack application on Eve Horizon — manifest-driven services, managed databases, build pipelines, deployment strategies, secrets, and observability. Use when designing a new app, planning a migration, or evaluating your architecture.
triggers:
  - fullstack design
  - app architecture
  - design an app
  - architect app
  - fullstack app
  - app design
  - system design eve
---

# Full-Stack App Design on Eve Horizon

Architect applications where the manifest is the blueprint, the platform handles infrastructure, and every design decision is intentional.

## When to Use

Load this skill when:
- Designing a new application from scratch on Eve
- Migrating an existing app onto the platform
- Evaluating whether your current architecture uses Eve's capabilities well
- Planning service topology, database strategy, or deployment pipelines
- Deciding between managed and external services

This skill teaches *design thinking* for Eve's PaaS layer. For CLI usage and operational detail, load the corresponding eve-se skills (`eve-manifest-authoring`, `eve-deploy-debugging`, `eve-auth-and-secrets`, `eve-pipelines-workflows`).

## The Manifest as Blueprint

The manifest (`.eve/manifest.yaml`) is the single source of truth for your application's shape. Treat it as an architectural document, not just configuration.

### What the Manifest Declares

| Concern | Manifest Section | Design Decision |
|---------|-----------------|-----------------|
| Service topology | `services` | What processes run, how they connect |
| Infrastructure | `services[].x-eve` | Managed DB, ingress, roles |
| Build strategy | `services[].build` + `registry` | What gets built, where images live |
| Release pipeline | `pipelines` | How code flows from commit to production |
| Environment shape | `environments` | Which environments exist, what pipelines they use |
| Agent configuration | `x-eve.agents`, `x-eve.chat` | Agent profiles, team dispatch, chat routing |
| Runtime defaults | `x-eve.defaults` | Harness, workspace, git policies |

**Design principle**: If an agent or operator can't understand your app's shape by reading the manifest, the manifest is incomplete.

## Service Topology

### Choose Your Services

Most Eve apps follow one of these patterns:

**API + Database** (simplest):
```
services:
  api:        # HTTP service with ingress
  db:         # managed Postgres
```

**API + Worker + Database**:
```
services:
  api:        # HTTP service (user-facing)
  worker:     # Background processor (jobs, queues)
  db:         # managed Postgres
```

**Multi-Service**:
```
services:
  web:        # Frontend/SSR
  api:        # Backend API
  worker:     # Background jobs
  db:         # managed Postgres
  redis:      # external cache (x-eve.external: true)
```

### Service Design Rules

1. **One concern per service.** Separate HTTP serving from background processing. An API service should not also run scheduled jobs.
2. **Use managed DB for Postgres.** Declare `x-eve.role: managed_db` and let the platform provision, connect, and inject credentials. No manual connection strings.
3. **Mark external services explicitly.** Use `x-eve.external: true` with `x-eve.connection_url` for services hosted outside Eve (Redis, third-party APIs).
4. **Use `x-eve.role: job` for one-off tasks.** Migrations, seeds, and data backfills are job services, not persistent processes.
5. **Expose ingress intentionally.** Only services that need external HTTP access get `x-eve.ingress.public: true`. Internal services communicate via cluster networking.
6. **Choose a hostname strategy early.** Every public service gets a generated platform URL by default. Layer on `x-eve.ingress.alias` for a friendlier platform-subdomain (`ingest.eve.example.com`), or `x-eve.ingress.domains: [limelee.com]` to bring your own domain. Custom domains are env-scoped and first-bind-wins — design which environment owns the apex (usually `production`) before