Architecture Overview · Enterprise AI Delivery

Policy Governance Library → Multi-Tenant SaaS

Transformed a single-tenant governance library into a multi-tenant SaaS platform in 13 structured tasks — with TypeScript strict mode, blue-green policy updates, HMAC webhook validation, and a 3-mode hybrid client SDK.

Multi-Tenant ArchitectureTypeScript · Fastify · PostgreSQL136 Tests Preserved

Click any component to explore it in the full case study.

Input A
Governance Library (136 tests)
Core policy engine with 6 components: framework scanner, artifact generator, compliance validator, audit manager, pattern matcher, SDLC gate enforcer. All 136 tests preserved.
TypeScript strict · 136 tests
Input B
Git Webhook / Tenant Config
GitHub/GitLab HMAC-verified webhooks trigger policy hot-reload. Tenant onboarding config: DB/cache/filesystem isolation parameters, encrypted credential storage.
HMAC webhook · Tenant isolation
13-Task SaaS Build Pipeline
Tasks 1–3
Foundation
TypeScript strict + Jest/fast-check PBT + PostgreSQL/Redis infra setup
›
Task 4
Git Sync
Clone, pull, change detection, encryption per tenant repo
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Tasks 6–7
Policy Orchestration
Webhook HMAC (5-min replay window) → blue-green index swap (5-index rollback capability)
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Task 9
Tenant Manager
DB/cache/filesystem isolation, encrypted credentials, distributed lock
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Tasks 10–13
API + SDK
15 API endpoints (validation + artifact gen) + Hybrid Client SDK (agent/library/auto modes)
🏗️
Multi-Tenant Isolation + Zero-Downtime Policy Updates
Each tenant has isolated DB schema, Redis namespace, and filesystem path. Policy updates use blue-green index swapping with 5-index rollback buffer. Distributed lock prevents concurrent policy updates per tenant.
136 unit tests preserved3 PBT propertiesTypeScript strict (0 errors)Blue-green index (5-rollback)Distributed lockHMAC webhook (5-min replay)Zero-downtime updates
Output A
Multi-Tenant Governance API
15 API endpoints serving compliance validation, artifact generation, and policy querying. Per-tenant isolation with zero cross-contamination.
15 endpoints · Tenant-isolated
Output B
Generated Compliance Artifacts
Model Card, DPIA, Risk Assessment — generated on-demand, stored per tenant, auditable. Same artifact types as the single-tenant library.
3 core artifact types
Output C
Hybrid Client SDK
3 modes: agent (autonomous), library (embedded), auto (detects context). Fallback logic ensures governance works even when SaaS API is unreachable.
3 SDK modes · Fallback-safe
13
Build tasks completed
15
API endpoints
136
Tests passing
3
SDK modes
StackTypeScript strictFastifyPostgreSQLRedis StackHypothesis (fast-check)GiteaJestHMAC webhook validation