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Table of Contents

Blueberry IDP Architecture Documentation

This directory contains system architecture documentation for the Blueberry Internal Developer Platform.

Directory Structure

📐 Overview

High-level system architecture
- System design principles
- Platform architecture diagrams
- Technology stack overview
- Deployment architecture

🧩 Components

Individual component documentation
- Backend API service
- Frontend UI application
- ArgoCD integration
- External Secrets Operator
- Redis cache layer
- Firebase authentication
- Firestore database

📊 Diagrams

Architecture diagrams and flowcharts
- System component diagrams
- Data flow diagrams
- Sequence diagrams
- Network topology
- Security boundaries
- Authentication and authorization flows
- Environment creation lifecycle
- Webhook processing flows
- Cost tracking and optimization
- Component-script testing mapping

📝 Decisions

Architecture Decision Records (ADRs)
- Technology choices
- Design patterns
- Trade-off analyses
- Migration strategies

Key Architecture Principles

GitOps First

  • All deployments through ArgoCD
  • Git as source of truth
  • Declarative configuration
  • Automated reconciliation

Cloud Native

  • Kubernetes-native design
  • Microservices architecture
  • Container-based deployment
  • Horizontal scalability

Security by Design

  • Zero-trust networking
  • Least privilege access
  • Encrypted communication
  • Audit logging

Cost Optimization

  • Serverless where possible (GKE Autopilot)
  • Resource efficiency
  • Auto-scaling policies
  • Free tier utilization

Architecture Patterns

Backend (FastAPI)

  • Async request handling
  • Dependency injection
  • Repository pattern for data access
  • Service layer for business logic

Frontend (HTMX + Alpine.js)

  • Server-side rendering
  • Progressive enhancement
  • Minimal JavaScript
  • Real-time updates via SSE

Infrastructure (Kubernetes + GCP)

  • GitOps with ArgoCD
  • Crossplane for cloud resources
  • External Secrets for secret management
  • Workload Identity for authentication

Component Interactions

User → Ingress → Backend API → Firebase Auth
                      ↓
                  Firestore
                      ↓
              ArgoCD Application
                      ↓
              Kubernetes Resources

Technology Stack

Core Platform

  • Language: Python 3.11+
  • Framework: FastAPI
  • Frontend: HTMX + Alpine.js
  • Database: Firestore
  • Cache: Redis

Infrastructure

  • Kubernetes: GKE Autopilot
  • GitOps: ArgoCD
  • IaC: Terraform + Crossplane
  • CI/CD: GitHub Actions / GitLab CI

Integrations

  • Auth: Firebase Authentication
  • Secrets: Google Secret Manager
  • Storage: Google Cloud Storage
  • DNS: Cloud DNS

Documentation Standards

Architecture documentation should:
- Use standard diagram notations (C4, UML)
- Include context and rationale
- Document constraints and assumptions
- Explain trade-offs
- Stay current with implementation

Document ID: architecture/README