diff --git a/asynq.go b/asynq.go
index 1ffcc41..a27c14d 100644
--- a/asynq.go
+++ b/asynq.go
@@ -8,21 +8,9 @@ TODOs:
 - [P2] Web UI
 */
 
-import (
-	"sync"
-	"time"
-
-	"github.com/go-redis/redis/v7"
-)
-
 // Max retry count by default
 const defaultMaxRetry = 25
 
-// Client is an interface for scheduling tasks.
-type Client struct {
-	rdb *rdb
-}
-
 // Task represents a task to be performed.
 type Task struct {
 	// Type indicates the kind of the task to be performed.
@@ -59,83 +47,3 @@ type RedisOpt struct {
 	Addr     string
 	Password string
 }
-
-// NewClient creates and returns a new client.
-func NewClient(opt *RedisOpt) *Client {
-	client := redis.NewClient(&redis.Options{Addr: opt.Addr, Password: opt.Password})
-	return &Client{rdb: newRDB(client)}
-}
-
-// Process enqueues the task to be performed at a given time.
-func (c *Client) Process(task *Task, executeAt time.Time) error {
-	msg := &taskMessage{
-		Type:    task.Type,
-		Payload: task.Payload,
-		Queue:   "default",
-		Retry:   defaultMaxRetry,
-	}
-	return c.enqueue(msg, executeAt)
-}
-
-// enqueue pushes a given task to the specified queue.
-func (c *Client) enqueue(msg *taskMessage, executeAt time.Time) error {
-	if time.Now().After(executeAt) {
-		return c.rdb.push(msg)
-	}
-	return c.rdb.zadd(scheduled, float64(executeAt.Unix()), msg)
-}
-
-//-------------------- Launcher --------------------
-
-// Launcher starts the manager and poller.
-type Launcher struct {
-	// running indicates whether manager and poller are both running.
-	running bool
-	mu      sync.Mutex
-
-	poller *poller
-
-	manager *manager
-}
-
-// NewLauncher creates and returns a new Launcher.
-func NewLauncher(poolSize int, opt *RedisOpt) *Launcher {
-	client := redis.NewClient(&redis.Options{Addr: opt.Addr, Password: opt.Password})
-	rdb := newRDB(client)
-	poller := newPoller(rdb, 5*time.Second, []string{scheduled, retry})
-	manager := newManager(rdb, poolSize, nil)
-	return &Launcher{
-		poller:  poller,
-		manager: manager,
-	}
-}
-
-// TaskHandler handles a given task and report any error.
-type TaskHandler func(*Task) error
-
-// Start starts the manager and poller.
-func (l *Launcher) Start(handler TaskHandler) {
-	l.mu.Lock()
-	defer l.mu.Unlock()
-	if l.running {
-		return
-	}
-	l.running = true
-	l.manager.handler = handler
-
-	l.poller.start()
-	l.manager.start()
-}
-
-// Stop stops both manager and poller.
-func (l *Launcher) Stop() {
-	l.mu.Lock()
-	defer l.mu.Unlock()
-	if !l.running {
-		return
-	}
-	l.running = false
-
-	l.poller.terminate()
-	l.manager.terminate()
-}
diff --git a/client.go b/client.go
new file mode 100644
index 0000000..b0eec16
--- /dev/null
+++ b/client.go
@@ -0,0 +1,37 @@
+package asynq
+
+import (
+	"time"
+
+	"github.com/go-redis/redis/v7"
+)
+
+// Client is an interface for scheduling tasks.
+type Client struct {
+	rdb *rdb
+}
+
+// NewClient creates and returns a new client.
+func NewClient(opt *RedisOpt) *Client {
+	client := redis.NewClient(&redis.Options{Addr: opt.Addr, Password: opt.Password})
+	return &Client{rdb: newRDB(client)}
+}
+
+// Process enqueues the task to be performed at a given time.
+func (c *Client) Process(task *Task, executeAt time.Time) error {
+	msg := &taskMessage{
+		Type:    task.Type,
+		Payload: task.Payload,
+		Queue:   "default",
+		Retry:   defaultMaxRetry,
+	}
+	return c.enqueue(msg, executeAt)
+}
+
+// enqueue pushes a given task to the specified queue.
+func (c *Client) enqueue(msg *taskMessage, executeAt time.Time) error {
+	if time.Now().After(executeAt) {
+		return c.rdb.push(msg)
+	}
+	return c.rdb.zadd(scheduled, float64(executeAt.Unix()), msg)
+}
diff --git a/launcher.go b/launcher.go
new file mode 100644
index 0000000..8d23dbf
--- /dev/null
+++ b/launcher.go
@@ -0,0 +1,61 @@
+package asynq
+
+import (
+	"sync"
+	"time"
+
+	"github.com/go-redis/redis/v7"
+)
+
+// Launcher starts the manager and poller.
+type Launcher struct {
+	// running indicates whether manager and poller are both running.
+	running bool
+	mu      sync.Mutex
+
+	poller *poller
+
+	manager *manager
+}
+
+// NewLauncher creates and returns a new Launcher.
+func NewLauncher(poolSize int, opt *RedisOpt) *Launcher {
+	client := redis.NewClient(&redis.Options{Addr: opt.Addr, Password: opt.Password})
+	rdb := newRDB(client)
+	poller := newPoller(rdb, 5*time.Second, []string{scheduled, retry})
+	manager := newManager(rdb, poolSize, nil)
+	return &Launcher{
+		poller:  poller,
+		manager: manager,
+	}
+}
+
+// TaskHandler handles a given task and report any error.
+type TaskHandler func(*Task) error
+
+// Start starts the manager and poller.
+func (l *Launcher) Start(handler TaskHandler) {
+	l.mu.Lock()
+	defer l.mu.Unlock()
+	if l.running {
+		return
+	}
+	l.running = true
+	l.manager.handler = handler
+
+	l.poller.start()
+	l.manager.start()
+}
+
+// Stop stops both manager and poller.
+func (l *Launcher) Stop() {
+	l.mu.Lock()
+	defer l.mu.Unlock()
+	if !l.running {
+		return
+	}
+	l.running = false
+
+	l.poller.terminate()
+	l.manager.terminate()
+}