diff --git a/backend/src/kibicara/platformapi.py b/backend/src/kibicara/platformapi.py
index d10f2ec..c1604c9 100644
--- a/backend/src/kibicara/platformapi.py
+++ b/backend/src/kibicara/platformapi.py
@@ -29,7 +29,7 @@ class Message:
         **kwargs (object, optional): Other platform-specific data.
     """
 
-    def __init__(self, text, **kwargs):
+    def __init__(self, text: str, **kwargs):
         self.text = text
         self.__dict__.update(kwargs)
 
@@ -82,17 +82,17 @@ class Censor:
         self.__hood_censors.append(self)
         self.status = BotStatus.INSTANTIATED
 
-    def start(self):
+    def start(self) -> None:
         """Start the bot."""
         if self.__task is None:
             self.__task = create_task(self.__run())
 
-    def stop(self):
+    def stop(self) -> None:
         """Stop the bot."""
         if self.__task is not None:
             self.__task.cancel()
 
-    async def __run(self):
+    async def __run(self) -> None:
         await self.hood.load()
         self.__task.set_name("{0} {1}".format(self.__class__.__name__, self.hood.name))
         try:
@@ -104,7 +104,7 @@ class Censor:
             self.__task = None
             self.status = BotStatus.STOPPED
 
-    async def run(self):
+    async def run(self) -> None:
         """Entry point for a bot.
 
         Note: Override this in the derived bot class.
@@ -112,14 +112,14 @@ class Censor:
         pass
 
     @classmethod
-    async def destroy_hood(cls, hood):
+    async def destroy_hood(cls, hood) -> None:
         """Remove all of its database entries.
 
         Note: Override this in the derived bot class.
         """
         pass
 
-    async def publish(self, message):
+    async def publish(self, message: Message) -> bool:
         """Distribute a message to the bots in a hood.
 
         Args:
@@ -132,14 +132,14 @@ class Censor:
             await censor._inbox.put(message)
         return True
 
-    async def receive(self):
+    async def receive(self) -> Message:
         """Receive a message.
 
         Returns (Message): Received message
         """
         return await self._inbox.get()
 
-    async def __is_appropriate(self, message):
+    async def __is_appropriate(self, message: Message) -> bool:
         for badword in await BadWord.objects.filter(hood=self.hood).all():
             if search(badword.pattern, message.text, IGNORECASE):
                 logger.debug(
@@ -186,13 +186,13 @@ class Spawner:
         self.__instances.append(self)
 
     @classmethod
-    async def init_all(cls):
+    async def init_all(cls) -> None:
         """Instantiate and start a bot for every row in the corresponding ORM model."""
         for spawner in cls.__instances:
             await spawner._init()
 
     @classmethod
-    async def destroy_hood(cls, hood):
+    async def destroy_hood(cls, hood) -> None:
         for spawner in cls.__instances:
             for pk in list(spawner.__bots):
                 bot = spawner.__bots[pk]
@@ -201,11 +201,11 @@ class Spawner:
                     bot.stop()
             await spawner.BotClass.destroy_hood(hood)
 
-    async def _init(self):
+    async def _init(self) -> None:
         for item in await self.ORMClass.objects.all():
             self.start(item)
 
-    def start(self, item):
+    def start(self, item) -> None:
         """Instantiate and start a bot with the provided ORM object.
 
         Example:
@@ -221,7 +221,7 @@ class Spawner:
         if bot.enabled:
             bot.start()
 
-    def stop(self, item):
+    def stop(self, item) -> None:
         """Stop and delete a bot.
 
         Args:
@@ -231,7 +231,7 @@ class Spawner:
         if bot is not None:
             bot.stop()
 
-    def get(self, item):
+    def get(self, item) -> Censor:
         """Get a running bot.
 
         Args: