Multi-Tenant Isolation
Ensuring data and compute isolation between tenants using DynamoDB partition keys, Lambda execution contexts, and IAM policies.
Serverless & Lambda Consulting
AWS Serverless Architecture for SaaS
We design serverless SaaS architectures on AWS that start at pennies per month, scale automatically with your customer base, and eliminate the infrastructure overhead that slows down product development.
- An event arrives — API, queue, or schedule.
- A function handles one unit of work.
- Integration is the bus and the store, not a hidden hop.
- Traces and alarms are in the same change as the function.
- Deploys stop on the pipeline check, not after customers see it.
- Capacity follows load; idle time is not a fleet you pay for.
Key Challenges We Solve
Tenant-Aware Scaling
Scaling independently per tenant to prevent noisy-neighbor problems while maintaining cost efficiency for low-usage tenants.
Authentication & Authorization
Multi-tenant authentication with Cognito, per-tenant authorization, and enterprise SSO federation for B2B SaaS.
Usage-Based Billing
Tracking per-tenant resource consumption for metered billing models using DynamoDB Streams and EventBridge.
Our Approach
Serverless SaaS Reference Architecture
API Gateway + Lambda + DynamoDB with single-table design, tenant isolation at every layer, and Cognito for multi-tenant auth.
Event-Driven Tenant Operations
EventBridge and Step Functions for tenant onboarding, subscription management, and cross-service workflows.
Zero-to-Scale Cost Model
Pay-per-request pricing that starts at near-zero for early-stage SaaS and scales linearly with paying customers.
Frequently Asked Questions
How much does a serverless SaaS platform cost on AWS?
A serverless SaaS platform with low traffic costs under $50/month. Lambda, API Gateway, DynamoDB, and Cognito all have generous free tiers. Costs scale linearly with usage — typically $0.01-$0.10 per active user per month at scale.
Can serverless handle enterprise SaaS workloads?
Yes. Lambda supports up to 10,000 concurrent executions (soft limit, increasable), DynamoDB handles millions of requests per second, and API Gateway supports thousands of requests per second. Many enterprise SaaS platforms run entirely on serverless.
How do you handle cold starts in a SaaS application?
For latency-sensitive APIs, use Provisioned Concurrency on critical Lambda functions. For most SaaS workloads, cold starts (100-500ms for Node.js/Python) are acceptable. Use Lambda SnapStart for Java workloads to reduce cold starts to under 200ms.
Ready to Get Started?
Talk to our AWS experts about aws serverless architecture for saas.