diff --git a/example/immich.ts b/example/immich.ts
index 5a92ec1..579deba 100644
--- a/example/immich.ts
+++ b/example/immich.ts
@@ -3,7 +3,7 @@
  * https://raw.githubusercontent.com/immich-app/immich/main/docker/docker-compose.yml
  */
 
-import { Stack, Service, deploySingle } from "../mod.ts";
+import { Stack } from "../mod.ts";
 
 interface ImmichStackOptions {
   stackName?: string;
@@ -16,80 +16,72 @@ interface ImmichStackOptions {
   };
 }
 
-function immichStack(props: ImmichStackOptions) {
-  const redis = new Service("redis", {
-    image: "registry.hub.docker.com/library/redis:6.2-alpine",
-    restart: "unless-stopped",
-  });
+export class ImmichStack extends Stack {
+  constructor(props: ImmichStackOptions) {
+    super(props.stackName ?? "immich");
 
-  // Create default credentials if not provided
-  props.postgres ??= {
-    password: "postgres",
-    username: "postgres",
-    database: "postgres",
-  };
+    const redis = this.addService("redis", {
+      image: "registry.hub.docker.com/library/redis:6.2-alpine",
+      restart: "unless-stopped",
+    });
 
-  const database = new Service("database", {
-    image: "registry.hub.docker.com/tensorchord/pgvecto-rs:pg14-v0.2.0",
-    restart: "unless-stopped",
-    environment: {
-      POSTGRES_USER: props.postgres.username,
-      POSTGRES_PASSWORD: props.postgres.password,
-      POSTGRES_DB: props.postgres.database,
-    },
-    // todo volumes
-  });
+    // Create default credentials if not provided
+    props.postgres ??= {
+      password: "postgres",
+      username: "postgres",
+      database: "postgres",
+    };
 
-  const immichEnv = {
-    DB_HOSTNAME: database.name,
-    DB_USERNAME: props.postgres.username,
-    DB_PASSWORD: props.postgres.password,
-    DB_DATABASE_NAME: props.postgres.database,
-    REDIS_HOSTNAME: redis.name,
-  };
+    const database = this.addService("database", {
+      image: "registry.hub.docker.com/tensorchord/pgvecto-rs:pg14-v0.2.0",
+      restart: "unless-stopped",
+      environment: {
+        POSTGRES_USER: props.postgres.username,
+        POSTGRES_PASSWORD: props.postgres.password,
+        POSTGRES_DB: props.postgres.database,
+      },
+      // todo volumes
+    });
 
-  const immichServer = new Service("immich-server", {
-    image: `ghcr.io/immich-app/immich-server:${
-      props.immichVersion ?? "release"
-    }`,
-    restart: "unless-stopped",
-    command: ["start.sh", "immich"],
-    depends_on: [database.name, redis.name],
-    // todo volumes
-    environment: immichEnv,
-    ports: ["2283:3001"],
-  });
+    const immichEnv = {
+      DB_HOSTNAME: database.name,
+      DB_USERNAME: props.postgres.username,
+      DB_PASSWORD: props.postgres.password,
+      DB_DATABASE_NAME: props.postgres.database,
+      REDIS_HOSTNAME: redis.name,
+    };
 
-  const immichMicroservices = new Service("immich-microservices", {
-    image: `ghcr.io/immich-app/immich-server:${
-      props.immichVersion ?? "release"
-    }`,
-    restart: "unless-stopped",
-    command: ["start.sh", "microservices"],
-    depends_on: [database.name, redis.name],
-    // todo volumes
-    environment: immichEnv,
-  });
+    const immichServer = this.addService("immich-server", {
+      image: `ghcr.io/immich-app/immich-server:${
+        props.immichVersion ?? "release"
+      }`,
+      restart: "unless-stopped",
+      command: ["start.sh", "immich"],
+      depends_on: [database.name, redis.name],
+      // todo volumes
+      environment: immichEnv,
+      ports: ["2283:3001"],
+    });
 
-  const immichMachineLearning = new Service("immich-machine-learning", {
-    image: `ghcr.io/immich-app/immich-machine-learning:${
-      props.immichVersion ?? "release"
-    }`,
-    // todo volumes
-    environment: immichEnv,
-  });
+    const immichMicroservices = this.addService("immich-microservices", {
+      image: `ghcr.io/immich-app/immich-server:${
+        props.immichVersion ?? "release"
+      }`,
+      restart: "unless-stopped",
+      command: ["start.sh", "microservices"],
+      depends_on: [database.name, redis.name],
+      // todo volumes
+      environment: immichEnv,
+    });
 
-  return new Stack(props.stackName ?? "immich", {
-    services: [
-      redis,
-      database,
-      immichServer,
-      immichMicroservices,
-      immichMachineLearning,
-    ],
-  });
+    const immichMachineLearning = this.addService("immich-machine-learning", {
+      image: `ghcr.io/immich-app/immich-machine-learning:${
+        props.immichVersion ?? "release"
+      }`,
+      // todo volumes
+      environment: immichEnv,
+    });
+  }
 }
 
-const stack = immichStack({ immichVersion: "v1.100.0" });
-
-deploySingle(stack);
+const stack = new ImmichStack({ immichVersion: "v1.100.0" });
diff --git a/mod.ts b/mod.ts
index 2f043de..db84154 100644
--- a/mod.ts
+++ b/mod.ts
@@ -1,2 +1 @@
 export * from "./src/components/mod.ts";
-export * from "./src/deployment.ts";
diff --git a/src/components/mod.ts b/src/components/mod.ts
index a17ee57..a6b2e71 100644
--- a/src/components/mod.ts
+++ b/src/components/mod.ts
@@ -1,2 +1 @@
 export * from "./stack.ts";
-export * from "./service.ts";
diff --git a/src/components/stack.ts b/src/components/stack.ts
index f82fc5d..7d81433 100644
--- a/src/components/stack.ts
+++ b/src/components/stack.ts
@@ -1,19 +1,28 @@
-import { ComposeSpecification } from "../compose-schema.ts";
+import { ComposeSpecification, DefinitionsService } from "../compose-schema.ts";
+import { registerDeployment } from "../deployment.ts";
 import { Service } from "./service.ts";
 
-interface StackOptions {
-  services: Service[];
-}
-
 export class Stack {
-  constructor(public name: string, public options: StackOptions) {}
+  private services: Record<string, Service> = {};
+
+  constructor(public name: string) {
+    registerDeployment(this);
+  }
+
+  public addService(name: string, service: DefinitionsService): Service {
+    if (this.services[name]) {
+      throw new Error(`Service ${name} already defined.`);
+    }
+    this.services[name] = new Service(name, service);
+
+    return this.services[name];
+  }
 
   public toComposeFile(): ComposeSpecification {
-    const services: ComposeSpecification["services"] = {};
-    for (const service of this.options.services) {
-      services[service.name] = service.options;
+    const services: Record<string, DefinitionsService> = {};
+    for (const [name, service] of Object.entries(this.services)) {
+      services[name] = service.options;
     }
-
     return {
       version: "3.8",
       services,
diff --git a/src/deployment.ts b/src/deployment.ts
index 273607d..615ad4b 100644
--- a/src/deployment.ts
+++ b/src/deployment.ts
@@ -1,22 +1,16 @@
 import { Stack } from "./components/mod.ts";
 import { ComposeSpecification } from "./compose-schema.ts";
 
-const deployments: Record<string, ComposeSpecification> = {};
-let printDeployments = false;
+const deployments: Stack[] = [];
 
-export function deploy(stack: Stack) {
-  deployments[stack.name] = stack.toComposeFile();
-  printDeployments = true;
-}
-
-export function deploySingle(stack: Stack) {
-  console.log(JSON.stringify(stack.toComposeFile(), null, 2));
+export function registerDeployment(stack: Stack) {
+  deployments.push(stack);
 }
 
 globalThis.addEventListener("unload", () => {
-  if (!printDeployments) {
-    return;
+  const stacks: Record<string, ComposeSpecification> = {};
+  for (const stack of deployments) {
+    stacks[stack.name] = stack.toComposeFile();
   }
-  // Print deployments
-  console.log(JSON.stringify(deployments, null, 2));
+  console.log(JSON.stringify(stacks, null, 2));
 });