diff --git a/.env.example b/.env.example
new file mode 100644
index 0000000..a9348f0
--- /dev/null
+++ b/.env.example
@@ -0,0 +1,19 @@
+# Server
+PORT=8000
+NODE_ENV=development
+
+# Database (PostgreSQL)
+DATABASE_URL=postgres://user:password@localhost:5432/pulse_crm
+
+# JWT
+JWT_SECRET=your-super-secret-jwt-key-min-32-chars
+JWT_ACCESS_EXPIRES=15m
+JWT_REFRESH_EXPIRES=7d
+
+# Email (Resend)
+RESEND_API_KEY=re_xxxxxxxxxxxxx
+EMAIL_FROM=noreply@pulse-crm.de
+
+# App
+APP_URL=https://crm.kronos-soulution.de
+API_URL=https://api.crm.kronos-soulution.de
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..0d97575
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,22 @@
+# Environment
+.env
+.env.local
+.env.*.local
+
+# Deno
+.deno/
+
+# IDE
+.vscode/
+.idea/
+
+# OS
+.DS_Store
+Thumbs.db
+
+# Logs
+*.log
+logs/
+
+# Build
+dist/
diff --git a/README.md b/README.md
index 05c4ef5..9aa47c4 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,80 @@
-# pulse-crm-backend
+# Pulse CRM Backend
 
-Pulse CRM Backend - Deno + PostgreSQL
\ No newline at end of file
+🫀 **Der Herzschlag deines Business** - Cloud-basiertes CRM für den deutschen Markt.
+
+## Tech Stack
+
+- **Runtime:** Deno 2.x
+- **Framework:** Oak
+- **Database:** PostgreSQL 16
+- **Auth:** JWT + Argon2
+- **Hosting:** Hetzner Cloud (DSGVO-konform)
+
+## Quick Start
+
+```bash
+# Dependencies cachen
+deno cache src/main.ts
+
+# Development Server
+deno task dev
+
+# Production
+deno task start
+```
+
+## API Endpoints
+
+| Endpoint | Beschreibung |
+|----------|--------------|
+| `GET /health` | Health Check |
+| `GET /api/v1` | API Info |
+| `POST /api/v1/auth/login` | Login |
+| `POST /api/v1/auth/register` | Registrierung |
+| `GET /api/v1/contacts` | Kontakte auflisten |
+| `GET /api/v1/deals` | Deals auflisten |
+| ... | ... |
+
+## Projektstruktur
+
+```
+src/
+├── main.ts           # Entry Point
+├── routes/           # API Routes
+│   ├── auth.ts
+│   ├── contacts.ts
+│   ├── deals.ts
+│   └── ...
+├── middleware/       # Middleware
+│   ├── auth.ts
+│   ├── cors.ts
+│   └── rateLimit.ts
+├── services/         # Business Logic
+├── models/           # Type Definitions
+├── db/               # Database
+│   ├── client.ts
+│   ├── migrate.ts
+│   └── schema.ts
+└── utils/            # Helpers
+```
+
+## Environment Variables
+
+Siehe `.env.example`
+
+## DSGVO
+
+- ✅ Hosting in Deutschland
+- ✅ Verschlüsselung (TLS + AES-256)
+- ✅ Audit Logging
+- ✅ Datenexport
+- ✅ Löschkonzept
+
+## Docs
+
+- [Architektur](docs/ARCHITECTURE.md)
+- [Tech Stack](docs/TECH-STACK.md)
+
+---
+
+© 2026 Pulse CRM - Made with 💚 in Germany
diff --git a/deno.json b/deno.json
new file mode 100644
index 0000000..029f738
--- /dev/null
+++ b/deno.json
@@ -0,0 +1,22 @@
+{
+  "name": "pulse-crm-backend",
+  "version": "0.1.0",
+  "tasks": {
+    "dev": "deno run --allow-net --allow-env --allow-read --watch src/main.ts",
+    "start": "deno run --allow-net --allow-env --allow-read src/main.ts",
+    "test": "deno test --allow-net --allow-env --allow-read",
+    "db:migrate": "deno run --allow-net --allow-env --allow-read src/db/migrate.ts",
+    "db:seed": "deno run --allow-net --allow-env --allow-read src/db/seed.ts"
+  },
+  "imports": {
+    "@oak/oak": "jsr:@oak/oak@^17.0.0",
+    "@std/dotenv": "jsr:@std/dotenv@^0.225.0",
+    "postgres": "https://deno.land/x/postgres@v0.19.3/mod.ts",
+    "zod": "https://deno.land/x/zod@v3.22.4/mod.ts",
+    "argon2": "https://deno.land/x/argon2@v0.9.2/mod.ts",
+    "djwt": "https://deno.land/x/djwt@v3.0.2/mod.ts"
+  },
+  "compilerOptions": {
+    "strict": true
+  }
+}
diff --git a/docs/ARCHITECTURE.md b/docs/ARCHITECTURE.md
new file mode 100644
index 0000000..a260295
--- /dev/null
+++ b/docs/ARCHITECTURE.md
@@ -0,0 +1,103 @@
+# Pulse CRM - Architektur
+
+## Übersicht
+
+Pulse CRM ist eine cloud-basierte (SaaS) Customer Relationship Management Lösung, entwickelt für den deutschen Markt mit voller DSGVO-Konformität.
+
+## Architektur-Diagramm
+
+```
+┌─────────────────────────────────────────────────────────────────┐
+│                         CLIENTS                                  │
+│  ┌──────────┐  ┌──────────┐  ┌──────────┐  ┌──────────┐        │
+│  │  Web App │  │  Mobile  │  │   API    │  │ Webhooks │        │
+│  │  (Vue 3) │  │   PWA    │  │  Client  │  │          │        │
+│  └────┬─────┘  └────┬─────┘  └────┬─────┘  └────┬─────┘        │
+└───────┼─────────────┼─────────────┼─────────────┼───────────────┘
+        │             │             │             │
+        └─────────────┴──────┬──────┴─────────────┘
+                             │ HTTPS
+                             ▼
+┌─────────────────────────────────────────────────────────────────┐
+│                      LOAD BALANCER                               │
+│                    (nginx / Traefik)                            │
+└────────────────────────────┬────────────────────────────────────┘
+                             │
+                             ▼
+┌─────────────────────────────────────────────────────────────────┐
+│                      API GATEWAY                                 │
+│  ┌──────────────────────────────────────────────────────────┐   │
+│  │                    Deno + Oak                             │   │
+│  │  ┌─────────┐  ┌─────────┐  ┌─────────┐  ┌─────────┐     │   │
+│  │  │  Auth   │  │  CORS   │  │  Rate   │  │ Logging │     │   │
+│  │  │Middleware│ │Middleware│ │ Limiter │  │         │     │   │
+│  │  └─────────┘  └─────────┘  └─────────┘  └─────────┘     │   │
+│  └──────────────────────────────────────────────────────────┘   │
+└────────────────────────────┬────────────────────────────────────┘
+                             │
+                             ▼
+┌─────────────────────────────────────────────────────────────────┐
+│                     API ROUTES                                   │
+│  ┌─────────┐  ┌─────────┐  ┌─────────┐  ┌─────────┐            │
+│  │  /auth  │  │/contacts│  │ /deals  │  │/pipeline│            │
+│  └─────────┘  └─────────┘  └─────────┘  └─────────┘            │
+│  ┌─────────┐  ┌─────────┐  ┌─────────┐  ┌─────────┐            │
+│  │/company │  │/activity│  │ /users  │  │/settings│            │
+│  └─────────┘  └─────────┘  └─────────┘  └─────────┘            │
+└────────────────────────────┬────────────────────────────────────┘
+                             │
+                             ▼
+┌─────────────────────────────────────────────────────────────────┐
+│                    SERVICE LAYER                                 │
+│  ┌──────────────┐  ┌──────────────┐  ┌──────────────┐          │
+│  │ContactService│  │ DealService  │  │ UserService  │          │
+│  └──────────────┘  └──────────────┘  └──────────────┘          │
+│  ┌──────────────┐  ┌──────────────┐  ┌──────────────┐          │
+│  │ AuthService  │  │ EmailService │  │ AuditService │          │
+│  └──────────────┘  └──────────────┘  └──────────────┘          │
+└────────────────────────────┬────────────────────────────────────┘
+                             │
+                             ▼
+┌─────────────────────────────────────────────────────────────────┐
+│                    DATA LAYER                                    │
+│  ┌─────────────────────────────────────────────────────────┐    │
+│  │                   PostgreSQL                             │    │
+│  │  ┌─────────┐  ┌─────────┐  ┌─────────┐  ┌─────────┐    │    │
+│  │  │  users  │  │contacts │  │  deals  │  │activities│    │    │
+│  │  └─────────┘  └─────────┘  └─────────┘  └─────────┘    │    │
+│  │  ┌─────────┐  ┌─────────┐  ┌─────────┐  ┌─────────┐    │    │
+│  │  │companies│  │pipelines│  │  orgs   │  │audit_log│    │    │
+│  │  └─────────┘  └─────────┘  └─────────┘  └─────────┘    │    │
+│  └─────────────────────────────────────────────────────────┘    │
+└─────────────────────────────────────────────────────────────────┘
+```
+
+## Entscheidungen
+
+### Cloud vs. Client
+
+**Entscheidung: Cloud-basiert (SaaS)**
+
+| Kriterium | Cloud | Client |
+|-----------|-------|--------|
+| Installation | Keine | Erforderlich |
+| Updates | Automatisch | Manuell |
+| Wartung | Zentral | Pro Installation |
+| Zugriff | Überall | Nur lokal |
+| DSGVO | EU-Hosting | Kunde verantwortlich |
+| Skalierung | Einfach | Komplex |
+| Time-to-Market | Schnell | Langsam |
+
+### Multi-Tenancy
+
+**Shared Database, Separate Schemas** - Jeder Kunde (Organization) hat:
+- Eigene `org_id` in allen Tabellen
+- Row-Level Security in PostgreSQL
+- Isolierte Daten, geteilte Infrastruktur
+
+## Hosting (DSGVO-konform)
+
+- **Provider:** Hetzner Cloud
+- **Standort:** Falkenstein/Nürnberg, Deutschland 🇩🇪
+- **Backup:** Täglich, 30 Tage Retention
+- **Verschlüsselung:** TLS 1.3 (Transit), AES-256 (Rest)
diff --git a/docs/TECH-STACK.md b/docs/TECH-STACK.md
new file mode 100644
index 0000000..0d7cee3
--- /dev/null
+++ b/docs/TECH-STACK.md
@@ -0,0 +1,121 @@
+# Pulse CRM - Tech Stack
+
+## Backend
+
+| Komponente | Technologie | Version | Begründung |
+|------------|-------------|---------|------------|
+| Runtime | **Deno** | 2.x | Sicher by default, TypeScript nativ, moderne APIs |
+| Framework | **Oak** | 17.x | Express-ähnlich, bewährt für Deno |
+| Datenbank | **PostgreSQL** | 16.x | ACID, JSON-Support, Row-Level Security |
+| ORM | **Drizzle ORM** | Latest | Type-safe, leichtgewichtig, gute DX |
+| Auth | **JWT** | - | Stateless, skalierbar |
+| Hashing | **Argon2** | - | Sicherster Passwort-Hash-Algorithmus |
+| Validation | **Zod** | 3.x | Runtime type validation |
+| Email | **Resend** | - | Moderne E-Mail API |
+
+## Frontend
+
+| Komponente | Technologie | Version | Begründung |
+|------------|-------------|---------|------------|
+| Framework | **Vue 3** | 3.5.x | Composition API, TypeScript, reaktiv |
+| UI Library | **PrimeVue** | 4.x | Enterprise-ready, umfangreich |
+| State | **Pinia** | 2.x | Offizieller Vue Store |
+| Router | **Vue Router** | 4.x | SPA Navigation |
+| HTTP | **Axios** | 1.x | HTTP Client |
+| Build | **Vite** | 5.x | Schnell, HMR, optimiert |
+| CSS | **TailwindCSS** | 3.x | Utility-first |
+| i18n | **vue-i18n** | 9.x | Mehrsprachigkeit (DE/EN) |
+
+## Infrastruktur
+
+| Komponente | Technologie | Begründung |
+|------------|-------------|------------|
+| Hosting | **Hetzner Cloud** | DSGVO, Deutschland, günstig |
+| Container | **Docker** | Portabilität, Reproduzierbarkeit |
+| Reverse Proxy | **nginx** | Performance, SSL Termination |
+| SSL | **Let's Encrypt** | Kostenlose Zertifikate |
+| CI/CD | **Gitea Actions** | Self-hosted, integriert |
+| Monitoring | **Prometheus + Grafana** | Open Source, bewährt |
+
+## Datenbank Schema (Übersicht)
+
+```sql
+-- Multi-Tenant Core
+organizations (id, name, settings, created_at)
+users (id, org_id, email, password_hash, role, ...)
+
+-- CRM Core
+contacts (id, org_id, first_name, last_name, email, phone, company_id, ...)
+companies (id, org_id, name, industry, website, ...)
+deals (id, org_id, title, value, stage_id, contact_id, owner_id, ...)
+pipelines (id, org_id, name, stages JSONB, ...)
+
+-- Activities
+activities (id, org_id, type, contact_id, deal_id, note, due_at, ...)
+
+-- System
+audit_logs (id, org_id, user_id, action, entity, entity_id, changes, ...)
+```
+
+## API Design
+
+### RESTful Conventions
+
+```
+GET    /api/v1/contacts          # Liste
+GET    /api/v1/contacts/:id      # Detail
+POST   /api/v1/contacts          # Erstellen
+PUT    /api/v1/contacts/:id      # Update
+DELETE /api/v1/contacts/:id      # Löschen
+
+# Nested Resources
+GET    /api/v1/contacts/:id/activities
+POST   /api/v1/deals/:id/move    # Custom Action
+```
+
+### Response Format
+
+```json
+{
+  "success": true,
+  "data": { ... },
+  "meta": {
+    "page": 1,
+    "limit": 20,
+    "total": 150
+  }
+}
+```
+
+### Error Format
+
+```json
+{
+  "success": false,
+  "error": {
+    "code": "VALIDATION_ERROR",
+    "message": "Invalid email format",
+    "details": [...]
+  }
+}
+```
+
+## Security
+
+- **Authentication:** JWT (Access Token 15min, Refresh Token 7d)
+- **Password:** Argon2id, min 8 chars
+- **Rate Limiting:** 100 req/min per IP, 1000 req/min per User
+- **CORS:** Whitelist allowed origins
+- **Input Validation:** Zod schemas for all inputs
+- **SQL Injection:** Parameterized queries via ORM
+- **XSS:** Content-Security-Policy headers
+- **HTTPS:** Enforced, HSTS enabled
+
+## DSGVO Compliance
+
+- ✅ Hosting in Deutschland (Hetzner)
+- ✅ Verschlüsselung (Transit + Rest)
+- ✅ Audit Logging
+- ✅ Datenexport (Art. 20)
+- ✅ Löschkonzept (Art. 17)
+- ✅ AVV-Vorlage für Kunden
diff --git a/src/main.ts b/src/main.ts
new file mode 100644
index 0000000..d69c62e
--- /dev/null
+++ b/src/main.ts
@@ -0,0 +1,81 @@
+import { Application } from "@oak/oak";
+import "@std/dotenv/load";
+
+const app = new Application();
+const PORT = parseInt(Deno.env.get("PORT") || "8000");
+
+// CORS Middleware
+app.use(async (ctx, next) => {
+  ctx.response.headers.set("Access-Control-Allow-Origin", "*");
+  ctx.response.headers.set("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE, OPTIONS");
+  ctx.response.headers.set("Access-Control-Allow-Headers", "Content-Type, Authorization");
+  
+  if (ctx.request.method === "OPTIONS") {
+    ctx.response.status = 204;
+    return;
+  }
+  
+  await next();
+});
+
+// Logger Middleware
+app.use(async (ctx, next) => {
+  const start = Date.now();
+  await next();
+  const ms = Date.now() - start;
+  console.log(`${ctx.request.method} ${ctx.request.url.pathname} - ${ctx.response.status} (${ms}ms)`);
+});
+
+// Health Check
+app.use(async (ctx, next) => {
+  if (ctx.request.url.pathname === "/health") {
+    ctx.response.body = { 
+      status: "ok", 
+      service: "pulse-crm-backend",
+      version: "0.1.0",
+      timestamp: new Date().toISOString()
+    };
+    return;
+  }
+  await next();
+});
+
+// API Info
+app.use(async (ctx, next) => {
+  if (ctx.request.url.pathname === "/api" || ctx.request.url.pathname === "/api/v1") {
+    ctx.response.body = {
+      name: "Pulse CRM API",
+      version: "1.0.0",
+      docs: "/api/v1/docs",
+      endpoints: {
+        auth: "/api/v1/auth/*",
+        contacts: "/api/v1/contacts/*",
+        companies: "/api/v1/companies/*",
+        deals: "/api/v1/deals/*",
+        pipelines: "/api/v1/pipelines/*",
+        activities: "/api/v1/activities/*",
+        users: "/api/v1/users/*"
+      }
+    };
+    return;
+  }
+  await next();
+});
+
+// 404 Handler
+app.use((ctx) => {
+  ctx.response.status = 404;
+  ctx.response.body = {
+    success: false,
+    error: {
+      code: "NOT_FOUND",
+      message: "Endpoint not found"
+    }
+  };
+});
+
+console.log(`🚀 Pulse CRM Backend starting on port ${PORT}...`);
+console.log(`📚 API Docs: http://localhost:${PORT}/api/v1`);
+console.log(`❤️  Health: http://localhost:${PORT}/health`);
+
+await app.listen({ port: PORT });