diff --git a/src/functions/__init__.py b/src/functions/__init__.py
index cf87eb1..d7a6eaa 100644
--- a/src/functions/__init__.py
+++ b/src/functions/__init__.py
@@ -6,6 +6,7 @@ import time
 import logging
 from datetime import datetime
 from multiprocessing import Process
+from typing import Final
 
 import requests
 from OpenSSL import crypto
@@ -91,17 +92,17 @@ class ContainerEnv:
 
 
 class Functions:
-    HAPROXY_LOG = "HAPROXY"
-    EASYHAPROXY_LOG = "EASYHAPROXY"
-    CERTBOT_LOG = "CERTBOT"
-    INIT_LOG = "INIT"
+    HAPROXY_LOG: Final[str] = "HAPROXY"
+    EASYHAPROXY_LOG: Final[str] = "EASYHAPROXY"
+    CERTBOT_LOG: Final[str] = "CERTBOT"
+    INIT_LOG: Final[str] = "INIT"
 
-    TRACE = "TRACE"
-    DEBUG = "DEBUG"
-    INFO = "INFO"
-    WARN = "WARN"
-    ERROR = "ERROR"
-    FATAL = "FATAL"
+    TRACE: Final[str] = "TRACE"
+    DEBUG: Final[str] = "DEBUG"
+    INFO: Final[str] = "INFO"
+    WARN: Final[str] = "WARN"
+    ERROR: Final[str] = "ERROR"
+    FATAL: Final[str] = "FATAL"
 
     @staticmethod
     def setup_log(source):
@@ -178,6 +179,9 @@ class Consts:
 
 
 class DaemonizeHAProxy:
+    HAPROXY_START: Final[str] = "start"
+    HAPROXY_RELOAD: Final[str] = "reload"
+
     def __init__(self, custom_config_folder = None):
         self.process = None
         self.thread = None
@@ -196,9 +200,9 @@ class DaemonizeHAProxy:
     def get_haproxy_command(self, action, pid_file="/run/haproxy.pid"):
         custom_config_files = ""
         if len(list(self.get_custom_config_files().keys())) != 0:
-            custom_config_files = "-f %s" % (self.custom_config_folder)
+            custom_config_files = "-f %s" % self.custom_config_folder
 
-        if action == "start":
+        if action == DaemonizeHAProxy.HAPROXY_START:
             return "/usr/sbin/haproxy -W -f /etc/haproxy/haproxy.cfg %s -p %s -S /var/run/haproxy.sock" % (custom_config_files, pid_file)
         else:
             return_code, output = Functions().run_bash(loggerHaproxy, "cat %s" % pid_file, log_output=False)
diff --git a/src/main.py b/src/main.py
index 1009b7e..30412a3 100644
--- a/src/main.py
+++ b/src/main.py
@@ -25,7 +25,7 @@ def start():
     old_haproxy = None
     haproxy = DaemonizeHAProxy()
     current_custom_config_files = haproxy.get_custom_config_files()
-    haproxy.haproxy("start")
+    haproxy.haproxy(DaemonizeHAProxy.HAPROXY_START)
     haproxy.sleep()
 
     certbot = Certbot(Consts.certs_certbot)
@@ -47,7 +47,7 @@ def start():
                 old_haproxy = haproxy
                 haproxy = DaemonizeHAProxy()
                 current_custom_config_files = haproxy.get_custom_config_files()
-                haproxy.haproxy("reload")
+                haproxy.haproxy(DaemonizeHAProxy.HAPROXY_RELOAD)
                 old_haproxy.terminate()
 
         except Exception as e:
diff --git a/src/processor/__init__.py b/src/processor/__init__.py
index c455ae2..ec038bf 100644
--- a/src/processor/__init__.py
+++ b/src/processor/__init__.py
@@ -1,5 +1,6 @@
 import base64
 import socket
+from typing import Final
 
 import docker
 import yaml
@@ -12,6 +13,11 @@ from functions import loggerEasyHaproxy
 
 
 class ProcessorInterface:
+    STATIC: Final[str] = "static"
+    DOCKER: Final[str] = "docker"
+    SWARM: Final[str] = "swarm"
+    KUBERNETES: Final[str] = "kubernetes"
+
     static_file = Consts.easyhaproxy_config
 
     def __init__(self, filename=None):
@@ -28,13 +34,13 @@ class ProcessorInterface:
 
     @staticmethod
     def factory(mode):
-        if mode == "static":
+        if mode == ProcessorInterface.STATIC:
             return Static(ProcessorInterface.static_file)
-        elif mode == "docker":
+        elif mode == ProcessorInterface.DOCKER:
             return Docker()
-        elif mode == "swarm":
+        elif mode == ProcessorInterface.SWARM:
             return Swarm()
-        elif mode == "kubernetes":
+        elif mode == ProcessorInterface.KUBERNETES:
             return Kubernetes()
         else:
             loggerEasyHaproxy.fatal("Expected mode to be 'static', 'docker', 'swarm' or 'kubernetes'. I got '%s'" % mode)
diff --git a/src/tests/test_daemonize.py b/src/tests/test_daemonize.py
index e5d87c9..dad002f 100644
--- a/src/tests/test_daemonize.py
+++ b/src/tests/test_daemonize.py
@@ -14,12 +14,12 @@ def test_daemonize_haproxy_check_config():
 
 def test_daemonize_haproxy_get_haproxy_command_start():
     daemon = DaemonizeHAProxy()
-    command = daemon.get_haproxy_command("start")
+    command = daemon.get_haproxy_command(DaemonizeHAProxy.HAPROXY_START)
     assert command == "/usr/sbin/haproxy -W -f /etc/haproxy/haproxy.cfg  -p /run/haproxy.pid -S /var/run/haproxy.sock"
 
 def test_daemonize_haproxy_get_haproxy_command_reload():
     daemon = DaemonizeHAProxy()
-    command = daemon.get_haproxy_command("reload")
+    command = daemon.get_haproxy_command(DaemonizeHAProxy.HAPROXY_RELOAD)
     assert command == "/usr/sbin/haproxy -W -f /etc/haproxy/haproxy.cfg  -p /run/haproxy.pid -x /var/run/haproxy.sock -sf "
 
 def test_daemonize_haproxy_check_config():
@@ -32,7 +32,7 @@ def test_daemonize_haproxy_check_config():
 
 def test_daemonize_haproxy_get_haproxy_command_start():
     daemon = DaemonizeHAProxy(os.path.abspath(os.path.dirname(__file__))  + '/fixtures')
-    command = daemon.get_haproxy_command("start")
+    command = daemon.get_haproxy_command(DaemonizeHAProxy.HAPROXY_START)
     assert command == "/usr/sbin/haproxy -W -f /etc/haproxy/haproxy.cfg -f %s -p /run/haproxy.pid -S /var/run/haproxy.sock" % (os.path.dirname(__file__) + "/fixtures")
 
 
@@ -42,7 +42,7 @@ def test_daemonize_haproxy_get_haproxy_command_reload():
 
     try:
         daemon = DaemonizeHAProxy(os.path.abspath(os.path.dirname(__file__))  + '/fixtures')
-        command = daemon.get_haproxy_command("reload", tmp_pid_file)
+        command = daemon.get_haproxy_command(DaemonizeHAProxy.HAPROXY_RELOAD, tmp_pid_file)
         assert command == "/usr/sbin/haproxy -W -f /etc/haproxy/haproxy.cfg -f %s -p %s -x /var/run/haproxy.sock -sf %s" % (os.path.dirname(__file__) + "/fixtures", tmp_pid_file, 10)
     finally:
         os.remove(tmp_pid_file)
diff --git a/src/tests/test_docker.py b/src/tests/test_docker.py
index e31063e..340ee5b 100644
--- a/src/tests/test_docker.py
+++ b/src/tests/test_docker.py
@@ -64,7 +64,7 @@ def test_processor_docker():
 
         os.environ['EASYHAPROXY_CERTBOT_EMAIL'] = 'docker@example.org'
 
-        static = ProcessorInterface.factory("docker")
+        static = ProcessorInterface.factory(ProcessorInterface.DOCKER)
         assert static.get_certbot_hosts() is None
 
         assert {
diff --git a/src/tests/test_static.py b/src/tests/test_static.py
index 7e6998c..91eedc5 100644
--- a/src/tests/test_static.py
+++ b/src/tests/test_static.py
@@ -6,7 +6,7 @@ from processor import ProcessorInterface
 
 def test_processor_static():
     ProcessorInterface.static_file = os.path.join(os.path.dirname(os.path.realpath(__file__)), "./fixtures/static.yml")
-    static = ProcessorInterface.factory("static")
+    static = ProcessorInterface.factory(ProcessorInterface.STATIC)
 
     parsed_object = [
         {