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Banking Application Implementation Plan

Phase 1: Project Setup & Infrastructure ✅ COMPLETED

  • Create monorepo structure with backend services, frontend, and infrastructure directories
  • Set up PostgreSQL with separate schemas for each microservice
  • Configure Docker Compose environment with logging and health checks

Phase 2: Backend Services Development ✅ COMPLETED

  • Implement Spring Boot microservices (user, accounts, transactions, api-gateway)
  • Add JWT authentication, database persistence, and initial OpenTelemetry instrumentation
  • Create comprehensive test suites with >80% code coverage

Phase 3: Frontend Development ✅ COMPLETED

  • Build Next.js frontend with TypeScript and authentication context
  • Implement responsive UI components for all banking operations
  • Integrate with backend APIs using comprehensive error handling

Phase 4: Testing ✅ COMPLETED

  • Complete backend testing suite (unit, integration, API tests)
  • Frontend testing with Jest, React Testing Library, and Playwright E2E tests
  • Achieve >80% test coverage across all services
  • API Route Testing with Proxymock: Set up proxymock server with predefined responses for all API endpoints to enable direct testing of Next.js API routes without database dependencies
  • Backend Test Fixes: Resolved JWT configuration issues in accounts-service by removing OAuth2 resource server configuration and using consistent custom JWT filter approach across all services

Phase 5: Observability & Monitoring ✅ COMPLETED

  • Deploy and configure a robust OpenTelemetry instrumentation across all services
  • Set up Jaeger, Prometheus, and Grafana monitoring stack
  • Configure and verify distributed tracing and custom business metrics

Phase 6: Containerization ✅ COMPLETED

  • Create optimized Docker images with multi-stage builds and security hardening
  • Refactor API endpoints for consistent resource-based structure
  • Validate containerized environment with comprehensive integration testing

Phase 7: Kubernetes Development & Testing ✅ COMPLETED

  • Create production-ready Kubernetes manifests with RBAC, ConfigMaps, and Secrets
  • Deploy and debug full stack on minikube with automated scripts
  • Build comprehensive E2E test client validating core authentication workflows

Phase 8: CI/CD Pipeline & Production Readiness ✅ COMPLETED

  • Set up GitHub Actions for automated building and testing with multi-architecture Docker images (ARM/AMD)
  • Configure Docker image registry with proper tagging, versioning, and optimize Spring Boot startup times
  • Simplify API Gateway routing architecture by eliminating complex path rewriting and implementing transparent proxy pattern

Phase 9: Observability & CI/CD Finalization ✅ COMPLETED

  • OpenTelemetry pure implementation (disabled Speedscale dependency)
  • Clean trace filtering removing health check noise
  • Fixed frontend CI test failures (Jest/Playwright separation)
  • Standardized OTel configuration across all services
  • E2E testing framework with Playwright
  • Fixed Cross-Application Trace Propagation: Resolved issues preventing trace IDs from propagating between pods by:
    • Fixed frontend trace context generation using proper W3C Trace Context format
    • Added Spring Cloud Gateway trace propagation configuration with TraceIdInjectionFilter
    • Updated RestTemplate configurations in backend services to use RestTemplateBuilder for automatic trace propagation
    • Standardized OpenTelemetry endpoints across all services (using otel-collector)
    • Created trace propagation filter for API Gateway to ensure proper header forwarding
    • Added comprehensive trace propagation test script to verify end-to-end tracing

Phase 10: Production Enhancement & Security

  • Production Kubernetes Deployment
    • Deploy to production cluster with SSL/TLS and ingress
    • Production monitoring, backup, and disaster recovery
  • Security Hardening
    • Service-to-service authentication
    • Rate limiting and CORS hardening
    • JWT improvements (refresh tokens, rotation)
    • Security headers and input validation
  • Observability Fine-tuning
    • Custom business metrics and Grafana dashboards
    • Performance monitoring and alerting

Phase 11: Advanced Features & Documentation

  • Enhanced banking features (account types, transaction categories)
  • Performance optimizations (caching, database tuning)
  • API documentation and security audit
  • Load testing and production validation

Success Criteria

Development & Testing (Phases 1-9) ✅ COMPLETE

  • All services running and communicating properly
  • Users can register, login, and manage accounts
  • Full observability with tracing and metrics
  • All tests passing (unit, integration, E2E)
  • Security requirements met (JWT, HTTPS, input validation)
  • Kubernetes manifests created and tested on minikube/Colima
  • CI/CD pipeline operational with image registry
  • System ready for production deployment
  • OpenTelemetry tracing fully functional with pure implementation (no Speedscale dependency)
  • Clean trace filtering removing health check noise while preserving business transaction visibility

Production Deployment (Phases 10-11)

  • Application deployed to production Kubernetes with security hardening
  • Production monitoring, performance optimization, and security audit complete
  • Advanced features and load testing validated