| System | Description | Technology |
|---|---|---|
| API Gateway | Proxies Backend | REST |
| Log Aggregator | Collects logs | |
| Metrics Aggregator | Collects metrics |
| System | Description | Technology |
|---|---|---|
| Authentication Service | Validates access token | OpenID Connect |
| Cache | Caches data | |
| Email Service (External) | Sends email messages (production) | SMTP |
| Email Service Emulator | Sends email messages (testing) | SMTP |
| File Storage | Stores files | AWS S3 |
| Log Aggregator | Mirrors DB data for full-text search | through Kafka |
| Message Broker | Sends and receives business events etc. | |
| Relational Database | Stores data | SQL |
| SMS Service (External) | Sends SMS messages | REST |