Tutorials System Design Tutorial
Distributed SaaS Platform Architecture — Complete Guide
Distributed SaaS Platform Architecture — Complete Guide: free step-by-step lesson with examples, common mistakes, and interview tips — part of System Design Tutorial on Toolliyo Academy.
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System Design Tutorial · Lesson 99 of 100
Distributed SaaS Platform Architecture
Basics ✓ → Scale ✓ → Interview
Interview · 3 — Case studies · ~10 min · Module 10: Real-World System Design Projects
What is this?
Multi-tenant SaaS architectures isolate tenants via pools or silos, enforce tenant context, and meter usage.
Why should you care?
ShopNest-as-a-platform for franchise stores needs isolation so one noisy tenant cannot crush others.
See it live — copy this example
Sketch the architecture on paper. These lessons focus on concepts and trade-offs.
TenantId on every row + RLS/analog
Pools: shared DB for SMB; silo for enterprise
Gateway sets tenant context from auth
Meter: API calls / storage for billing
Noisy neighbor: rate limits per tenantRun Example »
This lesson uses terminal or setup steps. Run commands on your computer — the live editor appears on coding lessons.
What happened?
- Shared pools are efficient; silos isolate big customers.
- Tenant context must be enforced server-side.
- Metering enables fair billing and limits.
Practice next
- Add TenantId to ShopNest shared tables.
- Enforce tenant in auth middleware.
- Offer silo SKU for large tenants.
- Shard heavy tenants to dedicated DB.
- Usage dashboard per tenant.
Remember
Tenant context everywhere. Pool vs silo trade-off. Meter and limit.
Franchise SaaS mode
ShopNest isolates franchise tenants with TenantId + limits.
Outcome: One franchise sale spike does not take down others.
Interview prep for this lesson
Practice these questions aloud after reading—each links to a full structured answer.
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