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jobtrackingapp/docs/architecture/overview.md
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# Architecture overview
Last verified: 2026-09-11 against the current repository.
## Components
```mermaid
flowchart LR
Browser --> Nginx[nginx static frontend]
Nginx --> API[ASP.NET Core API]
API --> DB[(SQLite or MariaDB/MySQL)]
API --> Data[Data root: uploads, CV artifacts, exports, keys]
API --> AI[FastAPI AI service]
AI --> Local[local transformers/Ollama]
AI --> Cloud[optional Gemini or Groq]
API --> Mail[Google/Gmail, Microsoft Graph, IMAP, SMTP]
API --> Jobs[NAV and job-site import clients]
```
The frontend is a client-rendered React application inside a Next.js static-export shell. nginx serves the export and proxies same-origin `/api` requests to the API. The API owns HTTP endpoints, business services, EF Core models/migrations, authentication, background services, files, and integrations. The AI service is an internal network dependency; it is not a user-authenticated application.
## Technology and ownership
| Component | Current implementation |
|---|---|
| UI | Next.js 16, React 19, TypeScript 5.9, MUI 7, React Router 7 |
| API | ASP.NET Core 9, EF Core 9, ASP.NET Identity, JWT bearer, cookie sessions |
| Data | SQLite default; Pomelo MySQL/MariaDB provider for server deployments |
| AI | FastAPI, transformers/distilbart summarizer, OCR and document extractors, Ollama/Gemini/Groq CV routes |
| Runtime | Docker Compose, nginx 1.29-alpine, optional Ollama profile |
| Delivery | Gitea Actions → SSH deployment → Docker Compose |
Further detail: [frontend architecture](frontend.md), [backend architecture](backend.md), [data flow](data-flow.md), [integrations](integrations.md), [database schema](../database/schema.md), and [deployment](../infrastructure/deployment.md).
The older [architecture/current.md](current.md) path is retained as a compatibility pointer to this overview.
## Important boundaries
- `Job` is the opportunity; `JobApplication` is the user's pursuit of it. Compatibility columns and dual writes remain until the production cutover gate is completed.
- Every tenant-owned record is filtered by the authenticated owner. A missing owner is denied, not treated as an anonymous tenant.
- AI is best-effort and policy-gated. Manual tracking remains usable when the AI service or a provider is unavailable.
- The current deployment is single-backend-instance. Worker leasing is intentionally not implemented for multi-replica operation.