diff --git a/src/main.ts b/src/main.ts
index d69c62e..fd6ba7b 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -1,14 +1,28 @@
 import { Application } from "@oak/oak";
 import "@std/dotenv/load";
 
+// Routes
+import { authRouter } from "./routes/auth.ts";
+import { contactsRouter } from "./routes/contacts.ts";
+import { dealsRouter } from "./routes/deals.ts";
+import { activitiesRouter } from "./routes/activities.ts";
+import { pipelinesRouter } from "./routes/pipelines.ts";
+
 const app = new Application();
 const PORT = parseInt(Deno.env.get("PORT") || "8000");
 
+// ============================================
+// MIDDLEWARE
+// ============================================
+
 // 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");
+  const origin = ctx.request.headers.get("origin") || "*";
+  ctx.response.headers.set("Access-Control-Allow-Origin", origin);
+  ctx.response.headers.set("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE, OPTIONS, PATCH");
   ctx.response.headers.set("Access-Control-Allow-Headers", "Content-Type, Authorization");
+  ctx.response.headers.set("Access-Control-Allow-Credentials", "true");
+  ctx.response.headers.set("Access-Control-Max-Age", "86400");
   
   if (ctx.request.method === "OPTIONS") {
     ctx.response.status = 204;
@@ -23,9 +37,34 @@ 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)`);
+  const status = ctx.response.status;
+  const statusColor = status >= 500 ? "\x1b[31m" : status >= 400 ? "\x1b[33m" : "\x1b[32m";
+  console.log(`${statusColor}${status}\x1b[0m ${ctx.request.method} ${ctx.request.url.pathname} - ${ms}ms`);
 });
 
+// Error Handler
+app.use(async (ctx, next) => {
+  try {
+    await next();
+  } catch (err) {
+    console.error("Error:", err);
+    ctx.response.status = 500;
+    ctx.response.body = {
+      success: false,
+      error: {
+        code: "INTERNAL_ERROR",
+        message: Deno.env.get("NODE_ENV") === "development" 
+          ? err.message 
+          : "An internal error occurred",
+      },
+    };
+  }
+});
+
+// ============================================
+// SYSTEM ROUTES
+// ============================================
+
 // Health Check
 app.use(async (ctx, next) => {
   if (ctx.request.url.pathname === "/health") {
@@ -33,7 +72,7 @@ app.use(async (ctx, next) => {
       status: "ok", 
       service: "pulse-crm-backend",
       version: "0.1.0",
-      timestamp: new Date().toISOString()
+      timestamp: new Date().toISOString(),
     };
     return;
   }
@@ -46,36 +85,94 @@ app.use(async (ctx, next) => {
     ctx.response.body = {
       name: "Pulse CRM API",
       version: "1.0.0",
-      docs: "/api/v1/docs",
+      description: "Der Herzschlag deines Business",
       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/*"
-      }
+        auth: {
+          "POST /api/v1/auth/register": "Register new user",
+          "POST /api/v1/auth/login": "Login",
+          "POST /api/v1/auth/refresh": "Refresh token",
+          "POST /api/v1/auth/logout": "Logout",
+          "GET /api/v1/auth/me": "Get current user",
+        },
+        contacts: {
+          "GET /api/v1/contacts": "List contacts",
+          "GET /api/v1/contacts/:id": "Get contact",
+          "POST /api/v1/contacts": "Create contact",
+          "PUT /api/v1/contacts/:id": "Update contact",
+          "DELETE /api/v1/contacts/:id": "Delete contact",
+        },
+        deals: {
+          "GET /api/v1/deals": "List deals",
+          "GET /api/v1/deals/pipeline": "Get pipeline view",
+          "GET /api/v1/deals/:id": "Get deal",
+          "POST /api/v1/deals": "Create deal",
+          "PUT /api/v1/deals/:id": "Update deal",
+          "POST /api/v1/deals/:id/move": "Move to stage",
+          "POST /api/v1/deals/:id/won": "Mark as won",
+          "POST /api/v1/deals/:id/lost": "Mark as lost",
+        },
+        activities: {
+          "GET /api/v1/activities": "List activities",
+          "GET /api/v1/activities/upcoming": "Upcoming tasks",
+          "POST /api/v1/activities": "Create activity",
+          "POST /api/v1/activities/:id/complete": "Complete task",
+        },
+        pipelines: {
+          "GET /api/v1/pipelines": "List pipelines",
+          "POST /api/v1/pipelines": "Create pipeline",
+          "PUT /api/v1/pipelines/:id/stages": "Update stages",
+        },
+      },
     };
     return;
   }
   await next();
 });
 
-// 404 Handler
+// ============================================
+// API ROUTES
+// ============================================
+
+app.use(authRouter.routes());
+app.use(authRouter.allowedMethods());
+
+app.use(contactsRouter.routes());
+app.use(contactsRouter.allowedMethods());
+
+app.use(dealsRouter.routes());
+app.use(dealsRouter.allowedMethods());
+
+app.use(activitiesRouter.routes());
+app.use(activitiesRouter.allowedMethods());
+
+app.use(pipelinesRouter.routes());
+app.use(pipelinesRouter.allowedMethods());
+
+// ============================================
+// 404 HANDLER
+// ============================================
+
 app.use((ctx) => {
   ctx.response.status = 404;
   ctx.response.body = {
     success: false,
     error: {
       code: "NOT_FOUND",
-      message: "Endpoint not found"
-    }
+      message: `Endpoint ${ctx.request.method} ${ctx.request.url.pathname} 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:${PORT}/health`);
+// ============================================
+// START SERVER
+// ============================================
+
+console.log("");
+console.log("  🫀 Pulse CRM Backend");
+console.log("  ====================");
+console.log(`  📡 Server:  http://localhost:${PORT}`);
+console.log(`  📚 API:     http://localhost:${PORT}/api/v1`);
+console.log(`  ❤️  Health:  http://localhost:${PORT}/health`);
+console.log("");
 
 await app.listen({ port: PORT });
diff --git a/src/routes/activities.ts b/src/routes/activities.ts
new file mode 100644
index 0000000..1412439
--- /dev/null
+++ b/src/routes/activities.ts
@@ -0,0 +1,153 @@
+import { Router } from "@oak/oak";
+
+const router = new Router({ prefix: "/api/v1/activities" });
+
+// GET /api/v1/activities - List activities
+router.get("/", async (ctx) => {
+  const query = ctx.request.url.searchParams;
+  const page = parseInt(query.get("page") || "1");
+  const limit = parseInt(query.get("limit") || "20");
+  const type = query.get("type"); // note, call, email, meeting, task
+  const contactId = query.get("contactId");
+  const dealId = query.get("dealId");
+  const userId = query.get("userId");
+  const completed = query.get("completed");
+
+  ctx.response.body = {
+    success: true,
+    data: [
+      {
+        id: "act-1",
+        type: "call",
+        subject: "Erstgespräch mit TechStart",
+        description: "Sehr interessiert an CRM Lösung",
+        contact: { id: "c-1", name: "Sarah Müller" },
+        deal: { id: "d-1", title: "TechStart CRM" },
+        user: { id: "u-1", name: "Max Mustermann" },
+        isCompleted: true,
+        completedAt: "2026-02-01T15:00:00Z",
+        createdAt: "2026-02-01T14:00:00Z",
+      },
+      {
+        id: "act-2",
+        type: "task",
+        subject: "Angebot erstellen",
+        dueDate: "2026-02-12T17:00:00Z",
+        contact: { id: "c-2", name: "Michael Fischer" },
+        deal: { id: "d-3", title: "ScaleUp Deal" },
+        user: { id: "u-1", name: "Max Mustermann" },
+        isCompleted: false,
+        createdAt: "2026-02-10T09:00:00Z",
+      },
+    ],
+    meta: { page, limit, total: 25 },
+  };
+});
+
+// GET /api/v1/activities/upcoming - Upcoming tasks & meetings
+router.get("/upcoming", async (ctx) => {
+  ctx.response.body = {
+    success: true,
+    data: {
+      today: [
+        {
+          id: "act-2",
+          type: "task",
+          subject: "Angebot erstellen",
+          dueDate: "2026-02-11T17:00:00Z",
+        },
+      ],
+      thisWeek: [
+        {
+          id: "act-3",
+          type: "meeting",
+          subject: "Demo Präsentation",
+          dueDate: "2026-02-15T14:00:00Z",
+        },
+      ],
+      overdue: [],
+    },
+  };
+});
+
+// GET /api/v1/activities/:id
+router.get("/:id", async (ctx) => {
+  const { id } = ctx.params;
+
+  ctx.response.body = {
+    success: true,
+    data: {
+      id,
+      type: "call",
+      subject: "Erstgespräch",
+      description: "Details...",
+      durationMinutes: 30,
+      callOutcome: "successful",
+      contact: { id: "c-1", firstName: "Sarah", lastName: "Müller" },
+      deal: { id: "d-1", title: "TechStart CRM" },
+      user: { id: "u-1", firstName: "Max", lastName: "Mustermann" },
+      isCompleted: true,
+      completedAt: "2026-02-01T15:00:00Z",
+      createdAt: "2026-02-01T14:00:00Z",
+    },
+  };
+});
+
+// POST /api/v1/activities - Create activity
+router.post("/", async (ctx) => {
+  const body = await ctx.request.body.json();
+
+  ctx.response.status = 201;
+  ctx.response.body = {
+    success: true,
+    message: "Activity created",
+    data: {
+      id: "new-act-uuid",
+      ...body,
+      createdAt: new Date().toISOString(),
+    },
+  };
+});
+
+// PUT /api/v1/activities/:id - Update activity
+router.put("/:id", async (ctx) => {
+  const { id } = ctx.params;
+  const body = await ctx.request.body.json();
+
+  ctx.response.body = {
+    success: true,
+    message: "Activity updated",
+    data: {
+      id,
+      ...body,
+      updatedAt: new Date().toISOString(),
+    },
+  };
+});
+
+// POST /api/v1/activities/:id/complete - Mark as completed
+router.post("/:id/complete", async (ctx) => {
+  const { id } = ctx.params;
+
+  ctx.response.body = {
+    success: true,
+    message: "Activity completed",
+    data: {
+      id,
+      isCompleted: true,
+      completedAt: new Date().toISOString(),
+    },
+  };
+});
+
+// DELETE /api/v1/activities/:id
+router.delete("/:id", async (ctx) => {
+  const { id } = ctx.params;
+
+  ctx.response.body = {
+    success: true,
+    message: "Activity deleted",
+  };
+});
+
+export { router as activitiesRouter };
diff --git a/src/routes/auth.ts b/src/routes/auth.ts
new file mode 100644
index 0000000..c5506d8
--- /dev/null
+++ b/src/routes/auth.ts
@@ -0,0 +1,155 @@
+import { Router } from "@oak/oak";
+
+const router = new Router({ prefix: "/api/v1/auth" });
+
+// POST /api/v1/auth/register
+router.post("/register", async (ctx) => {
+  const body = await ctx.request.body.json();
+  const { email, password, firstName, lastName, orgName } = body;
+
+  // TODO: Implement registration
+  // 1. Validate input (Zod)
+  // 2. Check if email exists
+  // 3. Hash password (Argon2)
+  // 4. Create organization
+  // 5. Create user
+  // 6. Send verification email
+  // 7. Return tokens
+
+  ctx.response.status = 201;
+  ctx.response.body = {
+    success: true,
+    message: "Registration successful",
+    data: {
+      user: {
+        id: "uuid",
+        email,
+        firstName,
+        lastName,
+      },
+      organization: {
+        id: "uuid",
+        name: orgName,
+      },
+      tokens: {
+        accessToken: "jwt_access_token",
+        refreshToken: "jwt_refresh_token",
+      },
+    },
+  };
+});
+
+// POST /api/v1/auth/login
+router.post("/login", async (ctx) => {
+  const body = await ctx.request.body.json();
+  const { email, password } = body;
+
+  // TODO: Implement login
+  // 1. Find user by email
+  // 2. Verify password (Argon2)
+  // 3. Generate tokens
+  // 4. Log login (audit)
+  // 5. Return user + tokens
+
+  ctx.response.body = {
+    success: true,
+    message: "Login successful",
+    data: {
+      user: {
+        id: "uuid",
+        email,
+        firstName: "Max",
+        lastName: "Mustermann",
+        role: "admin",
+        orgId: "org_uuid",
+      },
+      tokens: {
+        accessToken: "jwt_access_token",
+        refreshToken: "jwt_refresh_token",
+        expiresIn: 900, // 15 minutes
+      },
+    },
+  };
+});
+
+// POST /api/v1/auth/refresh
+router.post("/refresh", async (ctx) => {
+  const body = await ctx.request.body.json();
+  const { refreshToken } = body;
+
+  // TODO: Implement token refresh
+  // 1. Validate refresh token
+  // 2. Check if revoked
+  // 3. Generate new access token
+  // 4. Optionally rotate refresh token
+
+  ctx.response.body = {
+    success: true,
+    data: {
+      accessToken: "new_jwt_access_token",
+      expiresIn: 900,
+    },
+  };
+});
+
+// POST /api/v1/auth/logout
+router.post("/logout", async (ctx) => {
+  const body = await ctx.request.body.json();
+  const { refreshToken } = body;
+
+  // TODO: Revoke refresh token
+
+  ctx.response.body = {
+    success: true,
+    message: "Logged out successfully",
+  };
+});
+
+// POST /api/v1/auth/forgot-password
+router.post("/forgot-password", async (ctx) => {
+  const body = await ctx.request.body.json();
+  const { email } = body;
+
+  // TODO: Send password reset email
+
+  ctx.response.body = {
+    success: true,
+    message: "If the email exists, a reset link has been sent",
+  };
+});
+
+// POST /api/v1/auth/reset-password
+router.post("/reset-password", async (ctx) => {
+  const body = await ctx.request.body.json();
+  const { token, password } = body;
+
+  // TODO: Reset password
+
+  ctx.response.body = {
+    success: true,
+    message: "Password reset successful",
+  };
+});
+
+// GET /api/v1/auth/me
+router.get("/me", async (ctx) => {
+  // TODO: Get current user from JWT
+
+  ctx.response.body = {
+    success: true,
+    data: {
+      id: "uuid",
+      email: "user@example.com",
+      firstName: "Max",
+      lastName: "Mustermann",
+      role: "admin",
+      organization: {
+        id: "org_uuid",
+        name: "Demo Company",
+        plan: "pro",
+      },
+    },
+  };
+});
+
+export { router as authRouter };
diff --git a/src/routes/contacts.ts b/src/routes/contacts.ts
new file mode 100644
index 0000000..af9b07d
--- /dev/null
+++ b/src/routes/contacts.ts
@@ -0,0 +1,214 @@
+import { Router } from "@oak/oak";
+
+const router = new Router({ prefix: "/api/v1/contacts" });
+
+// GET /api/v1/contacts - List contacts
+router.get("/", async (ctx) => {
+  const query = ctx.request.url.searchParams;
+  const page = parseInt(query.get("page") || "1");
+  const limit = parseInt(query.get("limit") || "20");
+  const search = query.get("search");
+  const status = query.get("status");
+  const companyId = query.get("companyId");
+  const ownerId = query.get("ownerId");
+  const tags = query.get("tags")?.split(",");
+
+  // TODO: Implement with database
+  // 1. Get org_id from JWT
+  // 2. Build query with filters
+  // 3. Paginate results
+
+  ctx.response.body = {
+    success: true,
+    data: [
+      {
+        id: "uuid-1",
+        firstName: "Sarah",
+        lastName: "Müller",
+        email: "sarah@example.com",
+        phone: "+49 30 123456",
+        company: { id: "comp-1", name: "TechStart GmbH" },
+        status: "active",
+        tags: ["VIP", "Entscheider"],
+        createdAt: "2026-01-15T10:00:00Z",
+      },
+    ],
+    meta: {
+      page,
+      limit,
+      total: 150,
+      totalPages: 8,
+    },
+  };
+});
+
+// GET /api/v1/contacts/:id - Get single contact
+router.get("/:id", async (ctx) => {
+  const { id } = ctx.params;
+
+  // TODO: Fetch from database
+
+  ctx.response.body = {
+    success: true,
+    data: {
+      id,
+      firstName: "Sarah",
+      lastName: "Müller",
+      email: "sarah@example.com",
+      phone: "+49 30 123456",
+      mobile: "+49 171 123456",
+      jobTitle: "CEO",
+      company: {
+        id: "comp-1",
+        name: "TechStart GmbH",
+      },
+      address: {
+        line1: "Hauptstraße 1",
+        city: "Berlin",
+        postalCode: "10115",
+        country: "Deutschland",
+      },
+      status: "active",
+      leadSource: "Website",
+      leadScore: 85,
+      tags: ["VIP", "Entscheider"],
+      customFields: {},
+      gdprConsent: true,
+      gdprConsentDate: "2026-01-01T00:00:00Z",
+      owner: {
+        id: "user-1",
+        name: "Max Mustermann",
+      },
+      createdAt: "2026-01-15T10:00:00Z",
+      updatedAt: "2026-02-01T14:30:00Z",
+    },
+  };
+});
+
+// POST /api/v1/contacts - Create contact
+router.post("/", async (ctx) => {
+  const body = await ctx.request.body.json();
+
+  // TODO: Implement
+  // 1. Validate input (Zod)
+  // 2. Check for duplicates
+  // 3. Create contact
+  // 4. Log audit
+
+  ctx.response.status = 201;
+  ctx.response.body = {
+    success: true,
+    message: "Contact created",
+    data: {
+      id: "new-uuid",
+      ...body,
+      createdAt: new Date().toISOString(),
+    },
+  };
+});
+
+// PUT /api/v1/contacts/:id - Update contact
+router.put("/:id", async (ctx) => {
+  const { id } = ctx.params;
+  const body = await ctx.request.body.json();
+
+  // TODO: Implement
+  // 1. Validate input
+  // 2. Check ownership
+  // 3. Update contact
+  // 4. Log audit (before/after)
+
+  ctx.response.body = {
+    success: true,
+    message: "Contact updated",
+    data: {
+      id,
+      ...body,
+      updatedAt: new Date().toISOString(),
+    },
+  };
+});
+
+// DELETE /api/v1/contacts/:id - Delete contact (soft delete)
+router.delete("/:id", async (ctx) => {
+  const { id } = ctx.params;
+
+  // TODO: Implement soft delete
+  // 1. Check ownership
+  // 2. Set deleted_at
+  // 3. Log audit
+
+  ctx.response.body = {
+    success: true,
+    message: "Contact deleted",
+  };
+});
+
+// GET /api/v1/contacts/:id/activities - Get contact activities
+router.get("/:id/activities", async (ctx) => {
+  const { id } = ctx.params;
+
+  ctx.response.body = {
+    success: true,
+    data: [
+      {
+        id: "act-1",
+        type: "call",
+        subject: "Erstgespräch",
+        description: "Sehr interessiert",
+        createdAt: "2026-02-01T14:00:00Z",
+        user: { id: "user-1", name: "Max Mustermann" },
+      },
+    ],
+  };
+});
+
+// GET /api/v1/contacts/:id/deals - Get contact deals
+router.get("/:id/deals", async (ctx) => {
+  const { id } = ctx.params;
+
+  ctx.response.body = {
+    success: true,
+    data: [
+      {
+        id: "deal-1",
+        title: "CRM Implementation",
+        value: 25000,
+        stage: "proposal",
+        status: "open",
+      },
+    ],
+  };
+});
+
+// POST /api/v1/contacts/import - Import contacts (CSV)
+router.post("/import", async (ctx) => {
+  // TODO: Handle CSV upload
+
+  ctx.response.body = {
+    success: true,
+    message: "Import started",
+    data: {
+      importId: "import-uuid",
+      status: "processing",
+    },
+  };
+});
+
+// GET /api/v1/contacts/export - Export contacts (DSGVO Art. 20)
+router.get("/export", async (ctx) => {
+  const format = ctx.request.url.searchParams.get("format") || "json";
+
+  // TODO: Generate export
+
+  ctx.response.body = {
+    success: true,
+    message: "Export ready",
+    data: {
+      downloadUrl: "/api/v1/contacts/export/download/export-uuid",
+      expiresAt: new Date(Date.now() + 3600000).toISOString(),
+    },
+  };
+});
+
+export { router as contactsRouter };
diff --git a/src/routes/deals.ts b/src/routes/deals.ts
new file mode 100644
index 0000000..546e958
--- /dev/null
+++ b/src/routes/deals.ts
@@ -0,0 +1,263 @@
+import { Router } from "@oak/oak";
+
+const router = new Router({ prefix: "/api/v1/deals" });
+
+// GET /api/v1/deals - List deals
+router.get("/", async (ctx) => {
+  const query = ctx.request.url.searchParams;
+  const page = parseInt(query.get("page") || "1");
+  const limit = parseInt(query.get("limit") || "20");
+  const pipelineId = query.get("pipelineId");
+  const stageId = query.get("stageId");
+  const status = query.get("status"); // open, won, lost
+  const ownerId = query.get("ownerId");
+
+  ctx.response.body = {
+    success: true,
+    data: [
+      {
+        id: "deal-1",
+        title: "TechStart CRM Implementation",
+        value: 25000,
+        currency: "EUR",
+        stage: { id: "proposal", name: "Angebot" },
+        status: "open",
+        probability: 50,
+        expectedCloseDate: "2026-03-15",
+        contact: { id: "contact-1", name: "Sarah Müller" },
+        company: { id: "comp-1", name: "TechStart GmbH" },
+        owner: { id: "user-1", name: "Max Mustermann" },
+        createdAt: "2026-01-20T10:00:00Z",
+      },
+    ],
+    meta: { page, limit, total: 45, totalPages: 3 },
+  };
+});
+
+// GET /api/v1/deals/pipeline - Get deals grouped by stage (Kanban)
+router.get("/pipeline", async (ctx) => {
+  const pipelineId = ctx.request.url.searchParams.get("pipelineId");
+
+  ctx.response.body = {
+    success: true,
+    data: {
+      pipeline: {
+        id: "pipeline-1",
+        name: "Sales Pipeline",
+      },
+      stages: [
+        {
+          id: "lead",
+          name: "Lead",
+          deals: [{ id: "deal-2", title: "New Lead", value: 10000 }],
+          totalValue: 10000,
+          count: 1,
+        },
+        {
+          id: "qualified",
+          name: "Qualifiziert",
+          deals: [{ id: "deal-3", title: "DataFlow", value: 15000 }],
+          totalValue: 15000,
+          count: 1,
+        },
+        {
+          id: "proposal",
+          name: "Angebot",
+          deals: [{ id: "deal-1", title: "TechStart", value: 25000 }],
+          totalValue: 25000,
+          count: 1,
+        },
+        {
+          id: "negotiation",
+          name: "Verhandlung",
+          deals: [{ id: "deal-4", title: "ScaleUp", value: 50000 }],
+          totalValue: 50000,
+          count: 1,
+        },
+      ],
+      summary: {
+        totalValue: 100000,
+        weightedValue: 47500, // Based on probability
+        totalDeals: 4,
+      },
+    },
+  };
+});
+
+// GET /api/v1/deals/:id - Get single deal
+router.get("/:id", async (ctx) => {
+  const { id } = ctx.params;
+
+  ctx.response.body = {
+    success: true,
+    data: {
+      id,
+      title: "TechStart CRM Implementation",
+      value: 25000,
+      currency: "EUR",
+      pipeline: { id: "pipeline-1", name: "Sales Pipeline" },
+      stage: { id: "proposal", name: "Angebot", probability: 50 },
+      status: "open",
+      expectedCloseDate: "2026-03-15",
+      contact: {
+        id: "contact-1",
+        firstName: "Sarah",
+        lastName: "Müller",
+        email: "sarah@techstart.de",
+      },
+      company: {
+        id: "comp-1",
+        name: "TechStart GmbH",
+      },
+      owner: {
+        id: "user-1",
+        firstName: "Max",
+        lastName: "Mustermann",
+      },
+      tags: ["Enterprise"],
+      customFields: {},
+      createdAt: "2026-01-20T10:00:00Z",
+      updatedAt: "2026-02-05T09:00:00Z",
+    },
+  };
+});
+
+// POST /api/v1/deals - Create deal
+router.post("/", async (ctx) => {
+  const body = await ctx.request.body.json();
+
+  ctx.response.status = 201;
+  ctx.response.body = {
+    success: true,
+    message: "Deal created",
+    data: {
+      id: "new-deal-uuid",
+      ...body,
+      createdAt: new Date().toISOString(),
+    },
+  };
+});
+
+// PUT /api/v1/deals/:id - Update deal
+router.put("/:id", async (ctx) => {
+  const { id } = ctx.params;
+  const body = await ctx.request.body.json();
+
+  ctx.response.body = {
+    success: true,
+    message: "Deal updated",
+    data: {
+      id,
+      ...body,
+      updatedAt: new Date().toISOString(),
+    },
+  };
+});
+
+// POST /api/v1/deals/:id/move - Move deal to different stage
+router.post("/:id/move", async (ctx) => {
+  const { id } = ctx.params;
+  const body = await ctx.request.body.json();
+  const { stageId } = body;
+
+  // TODO: Implement stage move
+  // 1. Validate stage exists in pipeline
+  // 2. Update deal
+  // 3. Log activity
+  // 4. Trigger webhooks
+
+  ctx.response.body = {
+    success: true,
+    message: "Deal moved",
+    data: {
+      id,
+      stageId,
+      updatedAt: new Date().toISOString(),
+    },
+  };
+});
+
+// POST /api/v1/deals/:id/won - Mark deal as won
+router.post("/:id/won", async (ctx) => {
+  const { id } = ctx.params;
+
+  ctx.response.body = {
+    success: true,
+    message: "Deal marked as won",
+    data: {
+      id,
+      status: "won",
+      actualCloseDate: new Date().toISOString(),
+    },
+  };
+});
+
+// POST /api/v1/deals/:id/lost - Mark deal as lost
+router.post("/:id/lost", async (ctx) => {
+  const { id } = ctx.params;
+  const body = await ctx.request.body.json();
+  const { reason } = body;
+
+  ctx.response.body = {
+    success: true,
+    message: "Deal marked as lost",
+    data: {
+      id,
+      status: "lost",
+      lostReason: reason,
+      actualCloseDate: new Date().toISOString(),
+    },
+  };
+});
+
+// DELETE /api/v1/deals/:id - Delete deal
+router.delete("/:id", async (ctx) => {
+  const { id } = ctx.params;
+
+  ctx.response.body = {
+    success: true,
+    message: "Deal deleted",
+  };
+});
+
+// GET /api/v1/deals/:id/activities - Get deal activities
+router.get("/:id/activities", async (ctx) => {
+  const { id } = ctx.params;
+
+  ctx.response.body = {
+    success: true,
+    data: [
+      {
+        id: "act-1",
+        type: "note",
+        subject: "Anforderungen besprochen",
+        createdAt: "2026-02-01T10:00:00Z",
+      },
+    ],
+  };
+});
+
+// GET /api/v1/deals/forecast - Sales forecast
+router.get("/forecast", async (ctx) => {
+  ctx.response.body = {
+    success: true,
+    data: {
+      currentMonth: {
+        expected: 75000,
+        weighted: 35000,
+        won: 15000,
+      },
+      nextMonth: {
+        expected: 50000,
+        weighted: 20000,
+      },
+      quarter: {
+        expected: 200000,
+        weighted: 95000,
+        won: 45000,
+      },
+    },
+  };
+});
+
+export { router as dealsRouter };
diff --git a/src/routes/pipelines.ts b/src/routes/pipelines.ts
new file mode 100644
index 0000000..58e180a
--- /dev/null
+++ b/src/routes/pipelines.ts
@@ -0,0 +1,109 @@
+import { Router } from "@oak/oak";
+
+const router = new Router({ prefix: "/api/v1/pipelines" });
+
+// GET /api/v1/pipelines - List pipelines
+router.get("/", async (ctx) => {
+  ctx.response.body = {
+    success: true,
+    data: [
+      {
+        id: "pipeline-1",
+        name: "Sales Pipeline",
+        isDefault: true,
+        stages: [
+          { id: "lead", name: "Lead", order: 1, probability: 10 },
+          { id: "qualified", name: "Qualifiziert", order: 2, probability: 25 },
+          { id: "proposal", name: "Angebot", order: 3, probability: 50 },
+          { id: "negotiation", name: "Verhandlung", order: 4, probability: 75 },
+          { id: "closed_won", name: "Gewonnen", order: 5, probability: 100 },
+          { id: "closed_lost", name: "Verloren", order: 6, probability: 0 },
+        ],
+        dealsCount: 15,
+        totalValue: 250000,
+      },
+    ],
+  };
+});
+
+// GET /api/v1/pipelines/:id
+router.get("/:id", async (ctx) => {
+  const { id } = ctx.params;
+
+  ctx.response.body = {
+    success: true,
+    data: {
+      id,
+      name: "Sales Pipeline",
+      isDefault: true,
+      stages: [
+        { id: "lead", name: "Lead", order: 1, probability: 10 },
+        { id: "qualified", name: "Qualifiziert", order: 2, probability: 25 },
+        { id: "proposal", name: "Angebot", order: 3, probability: 50 },
+        { id: "negotiation", name: "Verhandlung", order: 4, probability: 75 },
+        { id: "closed_won", name: "Gewonnen", order: 5, probability: 100 },
+        { id: "closed_lost", name: "Verloren", order: 6, probability: 0 },
+      ],
+    },
+  };
+});
+
+// POST /api/v1/pipelines - Create pipeline
+router.post("/", async (ctx) => {
+  const body = await ctx.request.body.json();
+
+  ctx.response.status = 201;
+  ctx.response.body = {
+    success: true,
+    message: "Pipeline created",
+    data: {
+      id: "new-pipeline-uuid",
+      ...body,
+    },
+  };
+});
+
+// PUT /api/v1/pipelines/:id - Update pipeline
+router.put("/:id", async (ctx) => {
+  const { id } = ctx.params;
+  const body = await ctx.request.body.json();
+
+  ctx.response.body = {
+    success: true,
+    message: "Pipeline updated",
+    data: {
+      id,
+      ...body,
+    },
+  };
+});
+
+// PUT /api/v1/pipelines/:id/stages - Update stages (reorder, add, remove)
+router.put("/:id/stages", async (ctx) => {
+  const { id } = ctx.params;
+  const body = await ctx.request.body.json();
+  const { stages } = body;
+
+  ctx.response.body = {
+    success: true,
+    message: "Stages updated",
+    data: {
+      id,
+      stages,
+    },
+  };
+});
+
+// DELETE /api/v1/pipelines/:id
+router.delete("/:id", async (ctx) => {
+  const { id } = ctx.params;
+
+  // TODO: Check if pipeline has deals
+
+  ctx.response.body = {
+    success: true,
+    message: "Pipeline deleted",
+  };
+});
+
+export { router as pipelinesRouter };