Multi-tenant SaaS platform on AWS

Problem

A SaaS product required tenant isolation, elastic APIs, edge performance/security, and controllable cloud spend — while standardizing how teams shipped infrastructure and application changes.

Solution

• Multi-tenant AWS architecture: VPC segmentation, ALB, RDS/Aurora, CloudFront + WAF, API Gateway and Lambda
• Tenant isolation across identity, API, data, storage, logging, encryption, and networking layers
• DevSecOps with Terraform modules, CI/CD, and vulnerability gates
• FinOps program: rightsizing, utilization analysis, Savings Plans evaluation

Results

• Production SaaS platform patterns reusable across tenants
• Stronger security ownership in delivery pipelines
• Approximately 25% reduction in annual AWS expenditure with improved cost visibility

Architecture

flowchart LR
  Clients --> CF[CloudFront + WAF]
  CF --> ALB[ALB]
  CF --> APIGW[API Gateway]
  APIGW --> Fn[Lambda]
  ALB --> App[App tier]
  App --> DB[(Aurora / RDS)]
  Fn --> DB
  Fn --> S3[(S3)]