SaaS Architecture Playbook | Avartana Labs Blog

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SaaS Architecture Playbook | Avartana Labs Blog

interface UserEvent {
id: string;
tenantId: string;
userId: string;
eventType: 'user.created' | 'user.updated' | 'user.deleted';
data: any;
timestamp: Date;
version: number;
}

logger.info('User action completed', {
tenantId: 'tenant-123',
userId: 'user-456',
action: 'subscription.upgraded',
correlationId: 'req-789',
duration: 150
});

const span = tracer.startSpan('process-payment');
span.setTag('tenant.id', tenantId);
span.setTag('payment.amount', amount);
// ... payment processing
span.finish();

interface TokenResponse {
access_token: string;
refresh_token: string;
expires_in: number;
token_type: 'Bearer';
}

interface Permission {
resource: string;
action: 'create' | 'read' | 'update' | 'delete';
conditions?: Record<string, any>;
}

interface Role {
name: string;
permissions: Permission[];
}

const session = await redis.get(`session:${sessionId}`);
if (!session) {
throw new Error('Session expired');
}

const pool = new Pool({
host: process.env.DB_HOST,
port: 5432,
database: process.env.DB_NAME,
user: process.env.DB_USER,
password: process.env.DB_PASSWORD,
max: 20, // maximum number of clients
idleTimeoutMillis: 30000,
connectionTimeoutMillis: 2000,
});

resource "aws_rds_cluster" "main" {
cluster_identifier     = "saas-database"
engine                = "aurora-postgresql"
engine_version        = "13.7"
database_name         = "saas_app"
master_username       = "postgres"
master_password       = var.db_password
skip_final_snapshot   = true
}

The SaaS Architecture Playbook: Building for Scale

The Foundation: Multi-Tenant Architecture

Tenant Isolation Strategies

1. Database-per-Tenant

2. Shared Database, Separate Schemas

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3. Shared Database, Shared Schema

Choosing Your Strategy

Data Architecture Patterns

Event Sourcing for Audit Trails

CQRS for Performance

Observability: The Key to Scaling

The Three Pillars

1. Logging

2. Metrics

3. Tracing

Alerting Strategy

Security Architecture

Authentication and Authorization

OAuth 2.0 + OIDC

Role-Based Access Control (RBAC)

Data Protection

Encryption at Rest

Encryption in Transit

Performance Optimization

Caching Strategy

Redis for Session Storage

CDN for Static Assets

Database Optimization

Connection Pooling

Query Optimization

Deployment and DevOps

Infrastructure as Code

CI/CD Pipeline

Blue-Green Deployments

Monitoring and Alerting

Application Performance Monitoring (APM)

Business Metrics Dashboard

Scaling Strategies

Horizontal Scaling

Vertical Scaling

Cost Optimization

Resource Right-sizing

Reserved Instances

Conclusion

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