Architecture Reference Blueprint
Multi-Tenant B2B SaaS Reference Architecture on AWS
A production-tested reference architecture for high-growth B2B SaaS on AWS, balancing cost-efficient pooled compute with strict cryptographic tenant data isolation.
System Constraints
Non-Negotiable Architecture Constraints
Component Topology
System Components & Technologies
Modular subsystems designed with decoupled responsibilities, clear contracts, and scalable storage layers.
Multi-Tenant B2B SaaS Reference Architecture on AWS Stack Topology
Edge & Routing Layer
Application Runtime
Data Tier
Identity & Access
Edge & Routing Layer
TLS termination, WAF rate-limiting, and tenant subdomain resolution
AWS CloudFront + Cloudflare Workers
Application Runtime
Pooled containerized microservices scaling dynamically with load
Amazon EKS with Karpenter Autoscaler
Data Tier
Multi-tenant relational database with Row Level Security policies
Amazon Aurora PostgreSQL Serverless v2
Identity & Access
Tenant-aware JWT token issuance with custom organization claims
AWS Cognito / Clerk B2B Organizations
Observability
Tenant-tagged distributed tracing, metrics, and audit logs
OpenTelemetry + Datadog / Grafana Tempo
Data Lifecycle
End-to-End Data Flow Sequence
Client requests arrive at CloudFront edge; tenant ID is extracted from the subdomain or JWT header.
Cloudflare Worker attaches tenant_id header and forwards to the Amazon EKS Application Load Balancer.
Application microservice verifies JWT and sets session-scoped tenant context (SET LOCAL app.current_tenant = 'tenant_123').
PostgreSQL Row Level Security (RLS) automatically filters all SELECT, UPDATE, and DELETE queries to the tenant.
Asynchronous background events are published to Amazon EventBridge with tenant metadata for billing metering.
Reliability & Resilience
Failure modes & automated mitigations
Noisy Neighbor Compute Saturation
Enforce per-tenant token bucket rate limits in edge Redis and configure EKS pod priority classes.
RLS Bypass on Direct Table Joins
Enforce FORCE ROW LEVEL SECURITY on all tenant tables and run automated pgTAP permission tests in CI/CD.
Database Connection Exhaustion
Deploy AWS RDS Proxy to pool and multiplex database connections across all serverless and container instances.
Architecture FAQs
Frequently asked blueprint questions
Pooled databases with PostgreSQL Row Level Security (RLS) reduce infrastructure costs by 80%+ and simplify schema migrations across thousands of tenants without managing thousands of separate database instances.
Our architecture supports a hybrid 'silo-and-pool' model, routing high-tier enterprise clients to dedicated database clusters while standard tiers share the pooled cluster.
Senior engineering teams that build for long-term production health
Schedule an architecture session to review your requirements, cloud budget, and implementation timeline.