Web Application Architecture: Essential Patterns

Web Application Architecture Guide

Application architecture is the hardest and most long-term impactful decision. The wrong choice early costs months of rewrites later. This guide helps you select the right architecture for your case.

Main Architectures

1. Monolithic Architecture

Everything in one application: frontend, backend, database.

myapp/
├── app/
│ ├── Http/Controllers/
│ ├── Models/
│ └── Services/
├── resources/views/
└── database/

When to choose it:

• Small to medium projects (up to 100K users)
• Small team (2-8 developers)
• Limited budget
• Want development speed

Cost on كلاود: One VPS, 6,900-competitive pricing — pricing and plans

2. Microservices Architecture

Every service fully independent with its own database.

Frontend → API Gateway → Services:
├── auth-service
├── user-service
├── order-service
├── notification-service
├── payment-service
└── report-service

Each service has:
├── Its own database
├── Independent Git repo
└── Independent Docker container

When to choose it:

• Over 500K active users
• Large team (20+ developers) or multiple teams
• Need to deploy each service independently

API Patterns

REST API (Most Common)

// Laravel REST API
Route::apiResource('invoices', InvoiceController::class);

// Auto-generates:
// GET /api/invoices
// POST /api/invoices
// GET /api/invoices/{id}
// PUT /api/invoices/{id}
// DELETE /api/invoices/{id}

GraphQL (For Complex Applications)

# Single query fetches multiple data without over-fetching
query GetUserWithInvoices($userId: ID!) {
 user(id: $userId) {
 name
 email
 invoices(status: "unpaid") {
 id
 amount
 dueDate
 }
 }
}

Event-Driven Architecture

// When an important event occurs
event(new OrderPaid($order));

// Independent listeners respond to the event
class SendInvoiceListener
{
 public function handle(OrderPaid $event): void
 {
 Mail::to($event->order->user)->send(new InvoiceEmail($event->order));
 }
}

class ActivateServiceListener
{
 public function handle(OrderPaid $event): void
 {
 ProvisioningService::activate($event->order->service);
 }
}

Choosing the Right Architecture

Question 1: How many developers on the team?
├── 1-5: Monolith
├── 5-15: Modular Monolith or simple SOA
└── 15+: Microservices acceptable

Question 2: How many users expected in year one?
├── Under 50K: Monolith is sufficient
├── 50K-500K: Scalable with Redis + Read Replica
└── 500K+: Start thinking about Microservices

Question 3: What are the compliance requirements?
├── Government/Financial: Strict data separation (SOA minimum)
└── Standard: Monolith with data encryption

Conclusion

Start with a Monolith. Think about decomposition when there is actual need. One server on كلاود (cloud.net.sa) is enough for 100K users with the right architecture. Moving to SOA or Microservices is a decision based on real growth, not future speculation.

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