Building Multi-Tenant SaaS with Laravel 11: Complete Architecture Guide

# Introduction

Multi-tenancy is the backbone of modern SaaS applications. In this guide, I'll walk you through three approaches to multi-tenancy in Laravel 11 and when to use each.

## Approach 1: Database Per Tenant

The most isolated approach. Each tenant gets their own database, providing maximum data isolation and easy backup/restore per tenant.

```php
// TenantService.php
public function switchDatabase(Tenant $tenant): void
{
config(['database.connections.tenant.database' => $tenant->database]);
DB::purge('tenant');
DB::reconnect('tenant');
}
```

## Approach 2: Shared Database with Tenant ID

Simpler to manage but requires scoping every query. Use Laravel's global scopes.

## Approach 3: Hybrid Approach

Share infrastructure but isolate sensitive data in separate schemas.

## Conclusion

Choose your approach based on data isolation requirements, scalability needs, and operational complexity you can handle.