# Final Comprehensive Tech Stack - TraceRTM

**Date**: 2025-11-22  
**Status**: ✅ COMPLETE - All decisions finalized based on exhaustive research

---

## PART 1: EXECUTIVE SUMMARY

### Backend Language Decision: GO

**Why Go (not Python, Java, Rust, .NET, PHP, Ruby)**:
1. ✅ Best performance (950K req/s)
2. ✅ Best for 1000 concurrent agents (goroutines)
3. ✅ Best WebSocket support (lightweight)
4. ✅ Fast cold start (55ms - serverless friendly)
5. ✅ Simple syntax (fast development)
6. ✅ Single binary deployment
7. ✅ Microservices-friendly
8. ✅ Growing hiring pool

**Comparison**:
- Rust: Better performance, but steep learning curve
- Python: Faster development, but slower performance
- Java: Largest ecosystem, but slower startup
- .NET: Good performance, but smaller hiring pool
- PHP/Ruby: Not suitable (weak async)

---

## PART 2: COMPLETE BACKEND STACK

### Core Framework

```
Language:       Go 1.23+

API Framework:  Echo (REST) + gqlgen (GraphQL)
├─ Echo:        ⭐⭐⭐⭐⭐ (REST endpoints)
├─ gqlgen:      ⭐⭐⭐⭐⭐ (GraphQL server)
├─ Performance: ⭐⭐⭐⭐⭐ (950K req/s)
├─ Learning:    ⭐⭐⭐⭐⭐ (easy)
└─ Maturity:    ⭐⭐⭐⭐⭐ (production-ready)

ORM:            GORM (database abstraction)
├─ Type Safety: ⭐⭐⭐⭐ (good)
├─ Performance: ⭐⭐⭐⭐ (good)
├─ Ecosystem:   ⭐⭐⭐⭐⭐ (largest Go ORM)
└─ Learning:    ⭐⭐⭐⭐ (easy)

Database:       Supabase (PostgreSQL + pgvector)
├─ Realtime:    ✅ WebSocket subscriptions
├─ Auth:        ✅ JWT tokens
├─ Storage:     ✅ File uploads
├─ Functions:   ✅ Edge Functions
└─ AI:          ✅ Embeddings (pgvector)

GraphQL Tools:
├─ gqlgen:      Schema-first code generation
├─ DataLoader:  N+1 query prevention
├─ Persisted:   Query caching
└─ Apollo:      Studio monitoring
```

### Architecture Pattern

```
Hexagonal Architecture (Ports & Adapters)
├─ Input Adapters
│  ├─ HTTP (REST/tRPC)
│  ├─ WebSocket (real-time)
│  ├─ CLI (command-line)
│  └─ Agent API (programmatic)
├─ Application Core
│  ├─ Use Cases (business logic)
│  ├─ Domain Models (entities)
│  └─ Domain Services (business rules)
└─ Output Adapters
   ├─ PostgreSQL (database)
   ├─ Supabase Realtime (WebSocket)
   ├─ NATS (message queue)
   ├─ Slack (notifications)
   └─ Jira/GitHub (integrations)
```

### Microservices

```
8 Bounded Contexts (Domain-Driven Design):

1. Item Service (Go)
   - Create, read, update, delete items
   - Item versioning
   - Item status workflow

2. Link Service (Go)
   - Create, read, update, delete links
   - Link validation
   - Cycle detection

3. Agent Service (Go)
   - Agent registration
   - Workload distribution
   - Conflict resolution

4. Event Service (Python)
   - Event storage (event sourcing)
   - Event replay
   - Temporal queries

5. Search Service (Python)
   - Full-text search
   - Semantic search (pgvector)
   - Indexing

6. Integration Service (Go)
   - Jira sync
   - GitHub sync
   - Slack notifications

7. Real-Time Service (Go)
   - WebSocket management
   - Event broadcasting
   - Live updates

8. Notification Service (Go)
   - Push notifications
   - Email notifications
   - Webhook notifications
```

### API Design (Hybrid: GraphQL + REST)

```
Internal API (GraphQL - type-safe, perfect for graph data)
├─ Query
│  ├─ item(id: ID!): Item
│  ├─ items(filter, limit, offset): [Item!]!
│  ├─ link(id: ID!): Link
│  └─ links(filter, limit, offset): [Link!]!
├─ Mutation
│  ├─ createItem(input): Item!
│  ├─ updateItem(id, input): Item!
│  ├─ deleteItem(id): Boolean!
│  ├─ createLink(input): Link!
│  ├─ updateLink(id, input): Link!
│  └─ deleteLink(id): Boolean!
└─ Subscription
   ├─ itemCreated: Item!
   ├─ itemUpdated(id): Item!
   ├─ itemDeleted(id): ID!
   ├─ linkCreated: Link!
   ├─ linkUpdated(id): Link!
   └─ linkDeleted(id): ID!

File Upload API (REST - multipart/form-data)
├─ POST /api/v1/upload
└─ GET /api/v1/files/{id}

Integration API (REST + Webhooks)
├─ POST /webhooks/jira
├─ POST /webhooks/github
├─ POST /webhooks/slack
└─ GET /integrations

Real-Time API (WebSocket via GraphQL Subscriptions)
├─ subscribe itemCreated
├─ subscribe itemUpdated
├─ subscribe linkCreated
└─ subscribe linkUpdated
```

### Supporting Libraries

```
Async:          Goroutines (built-in)
WebSocket:      gorilla/websocket (GraphQL subscriptions)
Validation:     go-playground/validator
Logging:        zap (structured logging)
Testing:        testify (assertions)
Mocking:        mockery (mock generation)
Database:       GORM (ORM)
Migrations:     golang-migrate (schema)
Caching:        go-redis (Redis client)
Message Queue:  NATS (event streaming)
Monitoring:     prometheus (metrics)
Tracing:        jaeger (distributed tracing)

GraphQL Specific:
├─ gqlgen:      Code generation from schema
├─ dataloader:  Batch loading (N+1 prevention)
├─ graphql-go:  GraphQL execution
└─ websocket:   Real-time subscriptions
```

### Deployment

```
Containerization:  Docker
Orchestration:     Kubernetes (optional)
Deployment:        Railway (simple) or AWS ECS (scalable)
CI/CD:             GitHub Actions
Monitoring:        Prometheus + Grafana
Logging:           ELK Stack (Elasticsearch + Logstash + Kibana)
```

---

## PART 3: COMPLETE FRONTEND STACK

### Core Framework

```
Framework:      React 19 + TypeScript
Build Tool:     Vite 5.0 (SPA)
├─ Build Time:  0.5s (instant HMR)
├─ Bundle Size: 42KB (minimal)
└─ Performance: ⭐⭐⭐⭐⭐ (excellent)

Routing:        React Router v7
State:          Legend State + TanStack Query v5
UI:             shadcn/ui + TailwindCSS
Forms:          React Hook Form + Zod
Tables:         TanStack Table v8
Graph:          Cytoscape.js
Node Editor:    React Flow
Code Editor:    Monaco Editor
Live Preview:   iframe sandbox
Drag & Drop:    dnd-kit
Notifications:  Sonner

API Clients:
├─ GraphQL:     Apollo Client (complex queries + subscriptions)
├─ REST:        openapi-fetch (file uploads)
└─ WebSocket:   GraphQL Subscriptions (real-time)

Testing:        Vitest + Playwright
Deployment:     Vercel
```

### Architecture

```
Hexagonal Architecture (Ports & Adapters)
├─ Input Adapters
│  ├─ HTTP (REST/tRPC)
│  ├─ WebSocket (real-time)
│  └─ Local Storage (offline)
├─ Application Core
│  ├─ Use Cases (business logic)
│  ├─ Domain Models (entities)
│  └─ Domain Services (business rules)
└─ Output Adapters
   ├─ API Client (HTTP)
   ├─ WebSocket Client (real-time)
   ├─ Local Storage (offline)
   └─ IndexedDB (offline-first)
```

### Component Architecture

```
Pages (16 Views)
├─ Feature View
├─ Code View
├─ Test View
├─ API View
├─ Database View
├─ Wireframe View
├─ Documentation View
├─ Deployment View
├─ Architecture View
├─ Infrastructure View
├─ Data Flow View
├─ Security View
├─ Performance View
├─ Monitoring View
├─ Domain Model View
└─ User Journey View

Shared Components
├─ ItemList
├─ ItemDetail
├─ ItemForm
├─ LinkDialog
├─ GraphViewer
├─ NodeEditor
├─ CodeEditor
├─ TestRunner
├─ QualityChecks
├─ ConflictResolver
├─ ActivityFeed
└─ SearchBar

Hooks
├─ useItems (query items)
├─ useLinks (query links)
├─ useAgents (query agents)
├─ useSync (real-time sync)
├─ useOffline (offline support)
└─ useConflictResolution (conflict handling)
```

---

## PART 4: COMPLETE MOBILE STACK

### Core Framework

```
Framework:      React Native 0.73+
Build Tool:     Expo 50+ (managed)
├─ Setup Time:  5 minutes
├─ EAS Builds:  Cloud builds (no Mac needed)
└─ OTA Updates: Expo Updates

Routing:        React Navigation
State:          Legend State + TanStack Query v5
Storage:        WatermelonDB (SQLite)
Forms:          React Hook Form + Zod
HTTP:           openapi-fetch
UI:             React Native Paper
Notifications:  Expo Notifications
Testing:        Jest + Detox
Deployment:     EAS (cloud builds)
Updates:        Expo Updates (OTA)
Realtime:       Supabase client
```

### Architecture

```
Same as Frontend (Hexagonal)
├─ Input Adapters
│  ├─ HTTP (REST/tRPC)
│  ├─ WebSocket (real-time)
│  └─ Local Storage (offline)
├─ Application Core
│  ├─ Use Cases (business logic)
│  ├─ Domain Models (entities)
│  └─ Domain Services (business rules)
└─ Output Adapters
   ├─ API Client (HTTP)
   ├─ WebSocket Client (real-time)
   ├─ WatermelonDB (offline)
   └─ Expo Notifications (push)
```

---

## PART 5: COMPLETE DESKTOP STACK

### Core Framework

```
Framework:      Electron 28+
Frontend:       React 19 (same as web)
Build:          electron-builder
Updates:        electron-updater
IPC:            Preload script pattern
Testing:        Playwright
Deployment:     GitHub Releases
Realtime:       Supabase client
```

---

## PART 6: DESIGN APPROACH

### Test-Driven Design (TDD)

```
Workflow:
1. Write failing test
2. Write minimal code to pass test
3. Refactor code
4. Repeat

Test Types:
├─ Unit Tests (business logic)
├─ Integration Tests (with database)
└─ E2E Tests (full flow)

Coverage Target: 80%+
```

### Schema-Driven Design (SDD)

```
Workflow:
1. Define OpenAPI schema
2. Generate code from schema
3. Implement handlers
4. Generate client from schema

Benefits:
├─ Type safety (frontend + backend)
├─ Contract-first development
├─ Auto-generated documentation
└─ Auto-generated clients
```

---

## PART 7: POLYGLOT JUSTIFICATION

### Backend Polyglot (Go + Python)

**Go Services** (7):
- Item Service
- Link Service
- Agent Service
- Integration Service
- Real-Time Service
- Notification Service
- API Gateway

**Python Services** (2):
- Event Service (event sourcing)
- Search Service (semantic search)

**Justification**:
- ✅ Go: Best for real-time coordination (1000 agents)
- ✅ Python: Best for event processing + semantic search
- ✅ Best tool for each job
- ✅ Microservices allow independent scaling

### Frontend Polyglot (TypeScript + Go)

**TypeScript** (frontend):
- React (web)
- React Native (mobile)
- Electron (desktop)

**Go** (backend):
- API Gateway
- 7 microservices

**Justification**:
- ✅ TypeScript: Best for frontend (type-safe, ecosystem)
- ✅ Go: Best for backend (performance, concurrency)
- ✅ Shared types (OpenAPI → TypeScript)
- ✅ No significant hiring penalty

---

## PART 8: COMPLETE ARCHITECTURE DIAGRAM

```
┌─────────────────────────────────────────────────────────────────┐
│                        CLIENTS                                   │
│  ┌──────────────┬──────────────┬──────────────┬──────────────┐  │
│  │   Web        │   Mobile     │   Desktop    │   Agents     │  │
│  │  (React)     │  (RN+Expo)   │  (Electron)  │  (CLI/API)   │  │
│  └──────────────┴──────────────┴──────────────┴──────────────┘  │
└─────────────────────────────────────────────────────────────────┘
                              ↓
┌─────────────────────────────────────────────────────────────────┐
│                    API GATEWAY (Go)                              │
│  (Route requests, rate limiting, auth)                          │
└─────────────────────────────────────────────────────────────────┘
                              ↓
┌─────────────────────────────────────────────────────────────────┐
│                   MICROSERVICES (Go + Python)                    │
│  ┌──────────────┬──────────────┬──────────────┬──────────────┐  │
│  │   Item       │   Link       │   Agent      │   Event      │  │
│  │  Service     │  Service     │  Service     │  Service     │  │
│  │  (Go)        │  (Go)        │  (Go)        │  (Python)    │  │
│  └──────────────┴──────────────┴──────────────┴──────────────┘  │
│  ┌──────────────┬──────────────┬──────────────┬──────────────┐  │
│  │   Search     │ Integration  │  Real-Time   │ Notification │  │
│  │  Service     │  Service     │  Service     │  Service     │  │
│  │  (Python)    │  (Go)        │  (Go)        │  (Go)        │  │
│  └──────────────┴──────────────┴──────────────┴──────────────┘  │
└─────────────────────────────────────────────────────────────────┘
                              ↓
┌─────────────────────────────────────────────────────────────────┐
│              SHARED INFRASTRUCTURE                               │
│  ┌──────────────┬──────────────┬──────────────┬──────────────┐  │
│  │ PostgreSQL   │   Redis      │    NATS      │  Supabase    │  │
│  │ (database)   │  (cache)     │  (queue)     │  (realtime)  │  │
│  └──────────────┴──────────────┴──────────────┴──────────────┘  │
└─────────────────────────────────────────────────────────────────┘
```

---

## PART 9: DEPLOYMENT ARCHITECTURE

```
Development
├─ Local: Docker Compose (all services)
├─ Testing: GitHub Actions (CI/CD)
└─ Staging: Railway (preview)

Production
├─ Frontend: Vercel (static files)
├─ Backend: Railway or AWS ECS (containers)
├─ Database: Supabase (managed PostgreSQL)
├─ Cache: Upstash Redis (managed)
├─ Queue: NATS (self-hosted or managed)
└─ Monitoring: Prometheus + Grafana
```

---

## CONCLUSION

### ✅ FINAL TECH STACK COMPLETE

**Backend**: Go + Echo + GORM + Supabase
**Frontend**: React 19 + Vite + TypeScript
**Mobile**: React Native + Expo
**Desktop**: Electron
**Database**: Supabase (PostgreSQL + pgvector)
**Architecture**: Hexagonal + Microservices
**Design**: TDD + SDD
**Deployment**: Docker + Railway/Vercel

**This stack is**:
- ✅ Optimal for performance (Go)
- ✅ Optimal for real-time (WebSocket)
- ✅ Optimal for 1000 concurrent agents
- ✅ Optimal for type safety (TypeScript + Go)
- ✅ Optimal for scalability (microservices)
- ✅ Optimal for maintainability (hexagonal)
- ✅ Optimal for development speed (TDD + SDD)


