diff --git a/src/components/AdoptionInterestNotification/index.tsx b/src/components/AdoptionInterestNotification/index.tsx
deleted file mode 100644
index c43adad..0000000
--- a/src/components/AdoptionInterestNotification/index.tsx
+++ /dev/null
@@ -1,57 +0,0 @@
-/* eslint-disable camelcase */
-// Package imports.
-import React, { useEffect, useState } from 'react';
-import { Text } from 'react-native';
-import { useNavigation } from '@react-navigation/native';
-
-// Component imports.
-
-// Service imports.
-import { FirebaseFirestoreTypes } from '@react-native-firebase/firestore';
-import { TouchableOpacity } from 'react-native-gesture-handler';
-import userAPI from '../../services/user/api';
-import animalAPI from '../../services/animal/api';
-import { INotificationDoc, INotificationAdoptionInterestData } from '../../services/notifications/api';
-
-// Style imports.
-
-// Type declaration.
-interface IAdoptionInterestNotificationProps {
-  notification: INotificationDoc,
-}
-
-// Component.
-export default function AdoptionInterestNotification({ notification }: IAdoptionInterestNotificationProps) : JSX.Element {
-  // Variables.
-  const navigation = useNavigation();
-  const [requester, setRequester] = useState<FirebaseFirestoreTypes.DocumentData>();
-  const [animal, setAnimal] = useState<FirebaseFirestoreTypes.DocumentData>();
-
-  // Styled components.
-
-  // Function declaration.
-  const fetchData = (): void => {
-    const data = notification.data as unknown as INotificationAdoptionInterestData;
-    if (!data) return;
-
-    userAPI.getUser(notification.from).then((result) => setRequester(result.data()));
-    animalAPI.getAnimal(data.animalId).then((result) => setAnimal({ id: result.id, data: result.data() }));
-  };
-
-  // Page effects.
-
-  useEffect(() => {
-    fetchData();
-  });
-
-  // JSX returned.
-  return (
-    <TouchableOpacity
-      onPress={() => {
-        navigation.navigate('AnimalDetails', { animalUID: animal?.id });
-      }}
-    >
-      <Text>{requester?.full_name} está interessado no seu pet {animal?.data.name}</Text>
-    </TouchableOpacity>
-  );
-}
diff --git a/src/components/AdoptionInterestNotification/styles.ts b/src/components/AdoptionInterestNotification/styles.ts
deleted file mode 100644
index 733a948..0000000
--- a/src/components/AdoptionInterestNotification/styles.ts
+++ /dev/null
@@ -1,13 +0,0 @@
-// Package imports.
-import { ViewProps } from 'react-native';
-import styled from 'styled-components/native';
-
-// Style imports.
-import { Theme } from '../../constants';
-
-// Styled components.
-export const Container = styled.View<ViewProps>`
-  flex: 1;
-  align-items: center;
-  background-color: ${Theme.default.background};
-`;
diff --git a/src/components/AnimalCard/index.tsx b/src/components/AnimalCard/index.tsx
index 09bed90..1ffead2 100644
--- a/src/components/AnimalCard/index.tsx
+++ b/src/components/AnimalCard/index.tsx
@@ -1,4 +1,4 @@
-import React, { ReactNode, useState } from 'react';
+import React, { useState } from 'react';
 import { ActivityIndicator } from 'react-native';
 import { TouchableWithoutFeedback } from 'react-native-gesture-handler';
 
@@ -6,19 +6,11 @@ import animalAPI from '../../services/animal/api';
 
 import { Images, Theme } from '../../constants';
 
+import { IAnimalCardProps } from '../../types/components/AnimalCard';
 import {
   CardBody, CardBox, CardHeader, CardImage, CardImageLoading, CardOptions, CardTitle,
 } from './styles';
 
-interface IAnimalCardProps {
-    title: string;
-    imageUrl: string | null;
-    headerOptions?: ReactNode;
-    body?: ReactNode;
-    headerBackground: string;
-    onPress?: () => void;
-}
-
 const AnimalCard = ({
   title, body, headerOptions, imageUrl, headerBackground, onPress,
 } : IAnimalCardProps) : JSX.Element => {
diff --git a/src/components/AnimalCard/styles.ts b/src/components/AnimalCard/styles.ts
index 744931e..6a70548 100644
--- a/src/components/AnimalCard/styles.ts
+++ b/src/components/AnimalCard/styles.ts
@@ -1,10 +1,7 @@
 import { ImageProps, TextProps, ViewProps } from 'react-native';
 import styled from 'styled-components/native';
 import { Theme } from '../../constants';
-
-interface CardHeaderProps extends ViewProps {
-    backgroundColor: string;
-}
+import { CardHeaderProps } from '../../types/components/AnimalCard';
 
 export const CardBox = styled.View<ViewProps>`
     width: 344px;
diff --git a/src/components/AsyncButton/index.tsx b/src/components/AsyncButton/index.tsx
index daacff3..ec71d30 100644
--- a/src/components/AsyncButton/index.tsx
+++ b/src/components/AsyncButton/index.tsx
@@ -1,16 +1,9 @@
 import React, { useState } from 'react';
 
 import { ActivityIndicator, GestureResponderEvent } from 'react-native';
-import { Button, ButtonType } from './styles';
+import { Button } from './styles';
 import { Theme } from '../../constants';
-
-interface IButtonProps extends ButtonType {
-  children: React.ReactNode,
-  asyncAction: boolean,
-  callback: <GestureResponderEvent>(arg: GestureResponderEvent) => void,
-  activityIndicator?: Record<string, unknown>,
-  styles?: Record<string, unknown>,
-}
+import { IButtonProps } from '../../types/components/AsyncButton';
 
 const AsyncButton : React.FC<IButtonProps> = (props : IButtonProps) => {
   const [disabled, setDisabled] = useState(false);
diff --git a/src/components/AsyncButton/styles.ts b/src/components/AsyncButton/styles.ts
index 39ae578..224995b 100644
--- a/src/components/AsyncButton/styles.ts
+++ b/src/components/AsyncButton/styles.ts
@@ -1,23 +1,7 @@
 import styled from 'styled-components/native';
-import { TouchableOpacityProps } from 'react-native';
 
 import { Theme } from '../../constants';
-
-export interface ButtonType extends TouchableOpacityProps {
-  flex?: number,
-  flexDirection?: string,
-  width?: string,
-  height?: string,
-  backgroundColor?: string,
-  marginTop?: string,
-  marginBottom?: string,
-  marginLeft?: string,
-  marginRight?: string,
-  borderRadius?: string,
-  alignSelf?: string,
-  alignItems?: string,
-  justifyContent?: string,
-}
+import { ButtonType } from '../../types/components/AsyncButton';
 
 export const Button = styled.TouchableOpacity<ButtonType>`
   flex: ${(props) => props.flex};
diff --git a/src/components/CustomTextInput/index.tsx b/src/components/CustomTextInput/index.tsx
index 50a6e3a..7b06c87 100644
--- a/src/components/CustomTextInput/index.tsx
+++ b/src/components/CustomTextInput/index.tsx
@@ -3,14 +3,8 @@ import {
   HelperText, TextInput,
 } from 'react-native-paper';
 
-import { FormikProps } from 'formik';
 import { NativeSyntheticEvent, TextInputFocusEventData } from 'react-native';
-
-interface ICustomTextInput<T> {
-  formikHelpers: FormikProps<T>,
-  fieldName: keyof T,
-  [propName: string]: unknown;
-}
+import { ICustomTextInput } from '../../types/components/CustomTextInput';
 
 const CustomTextInput = <T, >({
   formikHelpers, fieldName, ...rest
diff --git a/src/components/DrawerContent/index.tsx b/src/components/DrawerContent/index.tsx
index 56bebca..89ca7e7 100644
--- a/src/components/DrawerContent/index.tsx
+++ b/src/components/DrawerContent/index.tsx
@@ -10,19 +10,16 @@ import useIsMounted from 'ismounted';
 
 import MaterialIcons from 'react-native-vector-icons/MaterialIcons';
 import { TouchableOpacity } from 'react-native-gesture-handler';
-import { styledComponents, styles } from './styles';
 
 import { Theme } from '../../constants';
-import { getNameInitials } from '../../utils/getNameInitials';
+import { useAuth } from '../../contexts/user/context';
 
 import userAPI from '../../services/user/api';
 import notificationAPI from '../../services/notifications/api';
-import { useAuth } from '../../contexts/user/context';
 
-export interface IDrawerProps {
-  parentDrawerOpen: boolean,
-  setParentDrawerOpen: (_: boolean) => void,
-}
+import { getNameInitials } from '../../utils/getNameInitials';
+import { IDrawerProps } from '../../types/components/DrawerContent';
+import { styledComponents, styles } from './styles';
 
 const fetchProfile = async (currentUser: FirebaseAuthTypes.User | null) : Promise<{displayName: string, photo: string | undefined} | undefined> => {
   if (currentUser != null) {
diff --git a/src/components/InfiniteScroll/index.tsx b/src/components/InfiniteScroll/index.tsx
index 86850a1..2360459 100644
--- a/src/components/InfiniteScroll/index.tsx
+++ b/src/components/InfiniteScroll/index.tsx
@@ -9,28 +9,8 @@ import { useFocusEffect } from '@react-navigation/native';
 // Style imports.
 import { defaultProps, styledComponents } from './styles';
 
-// Type declaration.
-type InfiniteScrollState<T> = {
-  allDataFetched: boolean,
-  data: Array<T>,
-  error: string | null,
-  loadingMore: boolean,
-  page: number,
-}
-
-// Interface declaration.
-interface IInfiniteScroll<T> {
-  activityIndicatorColor?: string,
-  contentBatchSize: number,
-  contentContainerStyles?: Record<string, unknown>,
-  dataFetchQuery: (lastEntry: T | null, pageNumber: number, pageSize: number) => Promise<Array<T>>,
-  errorContainerStyles?: Record<string, unknown>,
-  formatContent: (queryResponseData : T) => JSX.Element,
-  keyExtractorFunction: (item: T) => string,
-  loadingContainerStyles?: Record<string, unknown>,
-  noDataFoundContainerStyles?: Record<string, unknown>,
-  numColumns: number,
-}
+// Typings imports
+import { InfiniteScrollState, IInfiniteScroll } from '../../types/components/InfiniteScroll';
 
 // Styled components.
 const {
diff --git a/src/contexts/user/context.ts b/src/contexts/user/context.ts
index 033705b..18dac64 100644
--- a/src/contexts/user/context.ts
+++ b/src/contexts/user/context.ts
@@ -1,9 +1,5 @@
 import React, { useContext } from 'react';
-import { FirebaseAuthTypes } from '@react-native-firebase/auth';
-
-interface IContext {
-    currentUser: FirebaseAuthTypes.User | null
-}
+import { IContext } from '../../types/contexts/user';
 
 const Context = React.createContext<IContext>({
   currentUser: null,
diff --git a/src/contexts/user/contextService.tsx b/src/contexts/user/contextService.tsx
index 8511b75..ed91698 100644
--- a/src/contexts/user/contextService.tsx
+++ b/src/contexts/user/contextService.tsx
@@ -1,11 +1,8 @@
 import React from 'react';
-import auth, { FirebaseAuthTypes } from '@react-native-firebase/auth';
+import auth from '@react-native-firebase/auth';
 
 import Context from './context';
-
-interface IGlobalServiceState {
-    currentUser: FirebaseAuthTypes.User | null
-}
+import { IGlobalServiceState } from '../../types/contexts/user';
 
 export default class GlobalState extends React.Component<Record<string, unknown>, IGlobalServiceState> {
   constructor(props: Record<string, unknown>) {
diff --git a/src/layouts/HeaderLayout/index.tsx b/src/layouts/HeaderLayout/index.tsx
index 0db70e2..e78b7af 100644
--- a/src/layouts/HeaderLayout/index.tsx
+++ b/src/layouts/HeaderLayout/index.tsx
@@ -11,35 +11,8 @@ import DrawerContent from '../../components/DrawerContent';
 
 import { Theme } from '../../constants';
 
-import { styledComponents, IHeaderProps, ITitleProps } from './styles';
-
-type HeaderActions = 'back' | 'drawer' | 'share' | 'search' | 'options';
-
-interface IButtonAction {
-  hidden?: boolean,
-  actionType?: HeaderActions,
-  iconColor?: string,
-  onPress?: () => void,
-}
-
-interface IRoutesDrawer {
-  path: string,
-  displayName: string,
-  icon: JSX.Element
-}
-
-interface IHeaderLayoutProps {
-  disableScrollView?: boolean,
-  headerShown: boolean,
-  headerStyles?: IHeaderProps,
-  title: string,
-  titleStyles?: ITitleProps,
-  leftAction: IButtonAction,
-  rightAction: IButtonAction,
-  children: React.ReactNode,
-  drawerRoutes?: Array<IRoutesDrawer>,
-  drawerUser?: boolean
-}
+import { IHeaderLayoutProps, IButtonAction } from '../../types/layouts/HeaderLayout';
+import { styledComponents } from './styles';
 
 export default function HeaderLayout({
   disableScrollView,
diff --git a/src/layouts/HeaderLayout/styles.ts b/src/layouts/HeaderLayout/styles.ts
index dd9813e..078bec0 100644
--- a/src/layouts/HeaderLayout/styles.ts
+++ b/src/layouts/HeaderLayout/styles.ts
@@ -1,18 +1,8 @@
-import { TouchableOpacityProps, TextProps, ViewProps } from 'react-native';
+import { TouchableOpacityProps, ViewProps } from 'react-native';
 import styled from 'styled-components/native';
 import Constants from 'expo-constants';
 
-export interface ITitleProps extends TextProps {
-  fontFamily?: string,
-  fontSize?: string,
-  color?: string,
-}
-
-export interface IHeaderProps extends ViewProps {
-  maxHeight?: string,
-  height?: string,
-  backgroundColor?: string,
-}
+import { ITitleProps, IHeaderProps } from '../../types/layouts/HeaderLayout';
 
 export const styledComponents = {
   LayoutContainer: styled.View<ViewProps>`
diff --git a/src/mocks/MockedNavigation/index.tsx b/src/mocks/MockedNavigation/index.tsx
index b0de023..dff6600 100644
--- a/src/mocks/MockedNavigation/index.tsx
+++ b/src/mocks/MockedNavigation/index.tsx
@@ -3,15 +3,11 @@ import React from 'react';
 import { NavigationContainer } from '@react-navigation/native';
 import { createStackNavigator } from '@react-navigation/stack';
 
+import { StackScreen } from '../../types/mocks/MockedNavigation';
+
 // Navigation configuration.
 const Stack = createStackNavigator();
 
-// Interfaces.
-interface StackScreen {
-  component: React.FC,
-  params?: Record<string, unknown>
-}
-
 // Component.
 export default function MockedNavigator(
   { component, params = {} } : StackScreen,
diff --git a/src/pages/Animal/Details/index.tsx b/src/pages/Animal/Details/index.tsx
index 39e718a..40a8f12 100644
--- a/src/pages/Animal/Details/index.tsx
+++ b/src/pages/Animal/Details/index.tsx
@@ -33,7 +33,7 @@ import { styles, styledComponents } from './styles';
 
 // Type imports.
 import * as AnimalTypes from '../../../types/animal';
-import * as CarouselTypes from '../../../types/carousel';
+import * as CarouselTypes from '../../../types/globals/Carousel';
 import * as RouteTypes from '../../../types/routes';
 
 // Utils imports.
diff --git a/src/pages/Animal/Interested/index.tsx b/src/pages/Animal/Interested/index.tsx
index 5e08516..570db9e 100644
--- a/src/pages/Animal/Interested/index.tsx
+++ b/src/pages/Animal/Interested/index.tsx
@@ -5,37 +5,31 @@ import {
   useNavigation,
   useRoute,
 } from '@react-navigation/native';
+
 import { setStatusBarBackgroundColor } from 'expo-status-bar';
 import {
   ActivityIndicator, Text, Image, TouchableOpacity, Alert,
 } from 'react-native';
+
 import { fromUnixTime, differenceInYears } from 'date-fns';
 import InfiniteScroll from '../../../components/InfiniteScroll';
-import { Theme } from '../../../constants';
 import HeaderLayout from '../../../layouts/HeaderLayout';
-import {
-  Container, LoadingContainer, LoadingText,
-} from './styles';
-import { DocumentData, DocumentRefData } from '../../../types/firebase';
-import * as RouteTypes from '../../../types/routes';
+
+import { Theme } from '../../../constants';
 
 // Service imports.
 import userAPI from '../../../services/user/api';
 import animalAPI from '../../../services/animal/api';
 import adoptionAPI from '../../../services/adoption/api';
 
-interface InterestedUser {
-  id: string;
-  ref: DocumentRefData;
-  imageURI: string;
-  userName: string;
-  birthDate: number;
-}
-
-interface UserCircleProps {
-  user: InterestedUser;
-  callback: (user: InterestedUser) => void;
-}
+// Type imports
+import * as RouteTypes from '../../../types/routes';
+import { DocumentData, DocumentRefData } from '../../../types/services/Firebase';
+import { UserCircleProps, InterestedUser } from '../../../types/pages/Animal';
+
+import {
+  Container, LoadingContainer, LoadingText,
+} from './styles';
 
 const getAge = (birthDateTimestamp: number): number => differenceInYears(new Date(), fromUnixTime(birthDateTimestamp));
 
diff --git a/src/pages/Animal/Registration/index.tsx b/src/pages/Animal/Registration/index.tsx
index 0aed8a5..cc43536 100644
--- a/src/pages/Animal/Registration/index.tsx
+++ b/src/pages/Animal/Registration/index.tsx
@@ -39,19 +39,10 @@ import FileOperations from '../../../utils/FileOperations';
 
 // Type imports.
 import * as AnimalTypes from '../../../types/animal';
+import { IUploadedPicture } from '../../../types/pages/Animal';
+import { IDialogState } from '../../../types/globals/Dialog';
 
 // Interface declarations.
-interface IUploadedPicture {
-  id: string,
-  remoteName: string,
-  localUri: string,
-}
-
-interface IDialogState {
-  open: boolean,
-  title: string,
-  message: string,
-}
 
 // Component export.
 export default function AnimalRegistration() : JSX.Element {
diff --git a/src/pages/Chat/Chat/index.tsx b/src/pages/Chat/Chat/index.tsx
index 76a004c..eed380a 100644
--- a/src/pages/Chat/Chat/index.tsx
+++ b/src/pages/Chat/Chat/index.tsx
@@ -16,7 +16,7 @@ import { Button, Modal, Portal } from 'react-native-paper';
 import HeaderLayout from '../../../layouts/HeaderLayout';
 import { Theme } from '../../../constants';
 import * as RouteTypes from '../../../types/routes';
-import { DocumentRefData, QuerySnapshotDocuments } from '../../../types/firebase';
+import { DocumentRefData, QuerySnapshotDocuments } from '../../../types/services/Firebase';
 import chatAPI from '../../../services/chat/api';
 import userAPI from '../../../services/user/api';
 
diff --git a/src/pages/Chat/ChatList/index.tsx b/src/pages/Chat/ChatList/index.tsx
index 1cbb106..b9d1430 100644
--- a/src/pages/Chat/ChatList/index.tsx
+++ b/src/pages/Chat/ChatList/index.tsx
@@ -27,7 +27,7 @@ import { styles, styledComponents } from './styles';
 
 // Type imports.
 import { ChatListEntry } from '../../../types/chat';
-import * as FirebaseTypes from '../../../types/firebase';
+import * as FirebaseTypes from '../../../types/services/Firebase';
 
 // Page exported.
 export default function ChatList() : JSX.Element {
diff --git a/src/pages/Login/index.tsx b/src/pages/Login/index.tsx
index ffa7a99..0c2b222 100644
--- a/src/pages/Login/index.tsx
+++ b/src/pages/Login/index.tsx
@@ -33,15 +33,8 @@ import HeaderLayout from '../../layouts/HeaderLayout';
 import CustomTextInput from '../../components/CustomTextInput';
 import { Theme, Values } from '../../constants';
 
-interface LoginForm {
-  email: string,
-  password: string,
-}
-interface IDialogState {
-  open: boolean,
-  title: string,
-  message: string,
-}
+import { ILoginForm } from '../../types/pages/Login';
+import { IDialogState } from '../../types/globals/Dialog';
 
 // Component export.
 export default function Login() : JSX.Element {
@@ -60,7 +53,7 @@ export default function Login() : JSX.Element {
     }, []),
   );
 
-  const signIn = async ({ email, password }: LoginForm): Promise<void> => {
+  const signIn = async ({ email, password }: ILoginForm): Promise<void> => {
     try {
       const response = await userAPI.signIn(email, password);
       if (response && response.user) {
diff --git a/src/pages/NotificationsList/index.tsx b/src/pages/NotificationsList/index.tsx
index 8c6c5bd..cd3e5dc 100644
--- a/src/pages/NotificationsList/index.tsx
+++ b/src/pages/NotificationsList/index.tsx
@@ -12,10 +12,11 @@ import { Container } from './styles';
 // Component imports.
 
 // Service imports.
-import notificationAPI, { NotificationType, NotificationModels } from '../../services/notifications/api';
+import notificationAPI from '../../services/notifications/api';
 // Style imports.
 
 // Type declaration.
+import { NotificationType, NotificationModels } from '../../types/services/Notifications';
 
 // Component.
 export default function NotificationsList() : JSX.Element {
@@ -44,28 +45,32 @@ export default function NotificationsList() : JSX.Element {
   );
 
   const notificationRenderer = (notification: (NotificationModels)): JSX.Element => {
+    // eslint-disable-next-line camelcase
+    const fromName = notification.from.data()?.full_name || 'Usuário deletado';
     switch (notification.type) {
       case NotificationType.adoptionInterest:
       {
+        const animalName = notification.animal.data()?.name || 'Animal deletado';
         return (
           <TouchableOpacity
             onPress={() => {
               navigation.navigate('AnimalDetails', { animalUID: notification.animal.id });
             }}
           >
-            <Text>{notification.from.data().full_name} está interessado no seu pet {notification.animal.data().name}</Text>
+            <Text>{fromName} está interessado no seu pet {animalName}</Text>
           </TouchableOpacity>
         );
       }
       case NotificationType.adoptionRefused:
       {
+        const animalName = notification.animal.data()?.name || 'Animal deletado';
         return (
           <TouchableOpacity
             onPress={() => {
               navigation.navigate('AnimalDetails', { animalUID: notification.animal.id });
             }}
           >
-            <Text>{notification.from.data().full_name} recusou sua solicitação ao pet {notification.animal.data().name}</Text>
+            <Text>{fromName} recusou sua solicitação ao pet {animalName}</Text>
           </TouchableOpacity>
         );
       }
diff --git a/src/pages/Registration/index.tsx b/src/pages/Registration/index.tsx
index 653fd9b..90b13f4 100644
--- a/src/pages/Registration/index.tsx
+++ b/src/pages/Registration/index.tsx
@@ -29,32 +29,13 @@ import { Theme, Values } from '../../constants';
 import HeaderLayout from '../../layouts/HeaderLayout';
 import FileOperations from '../../utils/FileOperations';
 
+// Type imports
+import { IDialogState } from '../../types/globals/Dialog';
+import { picturePath, ISignUpForm } from '../../types/pages/Registration';
+
 // Theme imports.
 import { styles, styledComponents } from './styles';
 
-// Type declarations.
-type picturePath = string | null;
-
-// Interface declarations.
-interface IDialogState {
-  open: boolean,
-  title: string,
-  message: string,
-}
-
-interface ISignUpForm {
-  fullName: string,
-  birthDate: Date | null,
-  email: string,
-  state: string,
-  city: string,
-  address: string,
-  phoneNumber: string,
-  username: string,
-  password: string,
-  passwordConfirmation: string,
-}
-
 // Component.
 export default function Registration() : JSX.Element {
   // Variable declaration.
diff --git a/src/routes.tsx b/src/routes.tsx
index ad03567..d6b7db2 100644
--- a/src/routes.tsx
+++ b/src/routes.tsx
@@ -19,17 +19,7 @@ import NotificationsList from './pages/NotificationsList';
 import Interested from './pages/Animal/Interested';
 import Chat from './pages/Chat/Chat';
 
-interface IRouteRule {
-  name: string,
-  component: () => JSX.Element,
-  privateComponent?: () => JSX.Element,
-  requireSession?: boolean,
-}
-
-interface IRoute {
-  name: string,
-  component: () => JSX.Element,
-}
+import { IRouteRule, IRoute } from './types/routes';
 
 // Routes.
 export default class Routes extends React.Component {
diff --git a/src/services/adoption/api.ts b/src/services/adoption/api.ts
index 8097ee5..d003e18 100644
--- a/src/services/adoption/api.ts
+++ b/src/services/adoption/api.ts
@@ -1,8 +1,13 @@
 import firestore from '@react-native-firebase/firestore';
+
 import animalAPI from '../animal/api';
-import notificationAPI, { NotificationType } from '../notifications/api';
-import { DocumentData, DocumentRefData, DocumentSnapshot } from '../../types/firebase';
-import { PaginatedMetaData, filterPaginated } from '../paginated/api';
+import notificationAPI from '../notifications/api';
+
+import { NotificationType } from '../../types/services/Notifications';
+import { DocumentData, DocumentRefData, DocumentSnapshot } from '../../types/services/Firebase';
+import { filterPaginated } from '../paginated/api';
+
+import { PaginatedMetaData } from '../../types/services/Paginated';
 
 const addInterestToAnimal = async (animal: DocumentRefData, user: DocumentRefData): Promise<void> => {
   const animalData = (await animal.get()).data();
diff --git a/src/services/animal/api.ts b/src/services/animal/api.ts
index 312574b..3a25527 100644
--- a/src/services/animal/api.ts
+++ b/src/services/animal/api.ts
@@ -5,17 +5,11 @@ import storage from '@react-native-firebase/storage';
 // Type imports.
 import { FirebaseFirestoreTypes } from '@react-native-firebase/firestore';
 import { FirebaseStorageTypes } from '@react-native-firebase/storage';
+import { QueryParams } from '../../types/services/Firebase';
 
 // User module imports.
 import { Values } from '../../constants';
 
-// Type declarations.
-type QueryParams = {
-  orderBy? : string | undefined,
-  startAfter? : FirebaseFirestoreTypes.DocumentFieldType | undefined,
-  limit? : number | undefined
-}
-
 // Service implementation.
 const api = {
 
diff --git a/src/services/chat/api.ts b/src/services/chat/api.ts
index 8b8e8ca..fb43b58 100644
--- a/src/services/chat/api.ts
+++ b/src/services/chat/api.ts
@@ -1,7 +1,7 @@
 import firestore from '@react-native-firebase/firestore';
 import {
   DocumentData, DocumentRefData, Query, QuerySnapshot,
-} from '../../types/firebase';
+} from '../../types/services/Firebase';
 
 const chatDocument = (chatUID: string): DocumentRefData => firestore().collection('chats').doc(chatUID);
 
diff --git a/src/services/notifications/api.ts b/src/services/notifications/api.ts
index 10f56aa..cf8bc5b 100644
--- a/src/services/notifications/api.ts
+++ b/src/services/notifications/api.ts
@@ -1,42 +1,13 @@
 import firestore from '@react-native-firebase/firestore';
-import { DocumentData, DocumentRefData } from '../../types/firebase';
+import { DocumentData, DocumentRefData } from '../../types/services/Firebase';
+import {
+  NotificationType,
+  INotificationAdoptionInterestData,
+  NotificationModels,
+} from '../../types/services/Notifications';
 
 import userAPI from '../user/api';
 
-export enum NotificationType {
-  standard = 'STD',
-  adoptionInterest = 'AIN',
-  adoptionRefused = 'ARE',
-}
-
-export interface INotificationAdoptionInterestData {
-  animal: DocumentRefData,
-}
-
-export interface NotificationModel {
-  id: string,
-  from: DocumentData,
-  to: DocumentRefData,
-  message: string,
-  seen: false,
-}
-
-export interface NotificationStandardModel extends NotificationModel {
-  type: NotificationType.standard,
-}
-
-export interface NotificationAdoptionModel extends NotificationModel {
-  type: NotificationType.adoptionInterest,
-  animal: DocumentData,
-}
-
-export interface NotificationAdoptionRefusedModel extends NotificationModel {
-  type: NotificationType.adoptionRefused,
-  animal: DocumentData,
-}
-
-export type NotificationModels = NotificationStandardModel | NotificationAdoptionModel | NotificationAdoptionRefusedModel;
-
 const sendToUser = (
   user: DocumentRefData,
   message: string,
diff --git a/src/services/paginated/api.ts b/src/services/paginated/api.ts
index ad81359..988432c 100644
--- a/src/services/paginated/api.ts
+++ b/src/services/paginated/api.ts
@@ -1,12 +1,6 @@
-import { Query, CollectionRef } from '../../types/firebase';
+import { Query, CollectionRef } from '../../types/services/Firebase';
 
-export interface PaginatedMetaData {
-  pageNumber: number;
-  pageSize: number;
-  lastElementMarker: unknown[];
-  marker: string;
-  orderByDirection?: 'asc' | 'desc';
-}
+import { PaginatedMetaData } from '../../types/services/Paginated';
 
 export const filterPaginated = (source: Query | CollectionRef, paginatedMetaData?: PaginatedMetaData): Query => {
   if (!paginatedMetaData) return source;
diff --git a/src/services/user/api.ts b/src/services/user/api.ts
index 5a4f350..9438caa 100644
--- a/src/services/user/api.ts
+++ b/src/services/user/api.ts
@@ -7,17 +7,11 @@ import storage from '@react-native-firebase/storage';
 import { FirebaseAuthTypes } from '@react-native-firebase/auth';
 import { FirebaseFirestoreTypes } from '@react-native-firebase/firestore';
 import { FirebaseStorageTypes } from '@react-native-firebase/storage';
+import { QueryParams } from '../../types/services/Firebase';
 
 // User module imports.
 import { Values } from '../../constants';
 
-// Type declarations.
-type QueryParams = {
-  orderBy? : string | undefined,
-  startAfter? : FirebaseFirestoreTypes.DocumentFieldType | undefined,
-  limit? : number | undefined
-}
-
 // Service implementation.
 const api = {
   createAuth(
diff --git a/src/types/chat.ts b/src/types/chat.ts
index d60922c..c5b91a8 100644
--- a/src/types/chat.ts
+++ b/src/types/chat.ts
@@ -2,7 +2,7 @@
 import { ImageSourcePropType } from 'react-native';
 
 // User type imports.
-import * as FirebaseTypes from './firebase';
+import * as FirebaseTypes from './services/Firebase';
 
 // Type declarations.
 export type ChatListEntry = {
diff --git a/src/types/components/AnimalCard/index.ts b/src/types/components/AnimalCard/index.ts
new file mode 100644
index 0000000..ca7d16e
--- /dev/null
+++ b/src/types/components/AnimalCard/index.ts
@@ -0,0 +1,15 @@
+import { ReactNode } from 'react';
+import { ViewProps } from 'react-native';
+
+export interface IAnimalCardProps {
+  title: string;
+  imageUrl: string | null;
+  headerOptions?: ReactNode;
+  body?: ReactNode;
+  headerBackground: string;
+  onPress?: () => void;
+}
+
+export interface CardHeaderProps extends ViewProps {
+  backgroundColor: string;
+}
diff --git a/src/types/components/AsyncButton/index.ts b/src/types/components/AsyncButton/index.ts
new file mode 100644
index 0000000..e423411
--- /dev/null
+++ b/src/types/components/AsyncButton/index.ts
@@ -0,0 +1,26 @@
+import React from 'react';
+import { TouchableOpacityProps } from 'react-native';
+
+export interface ButtonType extends TouchableOpacityProps {
+  flex?: number,
+  flexDirection?: string,
+  width?: string,
+  height?: string,
+  backgroundColor?: string,
+  marginTop?: string,
+  marginBottom?: string,
+  marginLeft?: string,
+  marginRight?: string,
+  borderRadius?: string,
+  alignSelf?: string,
+  alignItems?: string,
+  justifyContent?: string,
+}
+
+export interface IButtonProps extends ButtonType {
+  children: React.ReactNode,
+  asyncAction: boolean,
+  callback: <GestureResponderEvent>(arg: GestureResponderEvent) => void,
+  activityIndicator?: Record<string, unknown>,
+  styles?: Record<string, unknown>,
+}
diff --git a/src/types/components/CustomTextInput/index.ts b/src/types/components/CustomTextInput/index.ts
new file mode 100644
index 0000000..c46bb11
--- /dev/null
+++ b/src/types/components/CustomTextInput/index.ts
@@ -0,0 +1,7 @@
+import { FormikProps } from 'formik';
+
+export interface ICustomTextInput<T> {
+  formikHelpers: FormikProps<T>,
+  fieldName: keyof T,
+  [propName: string]: unknown;
+}
diff --git a/src/types/components/DrawerContent/index.ts b/src/types/components/DrawerContent/index.ts
new file mode 100644
index 0000000..a318c7e
--- /dev/null
+++ b/src/types/components/DrawerContent/index.ts
@@ -0,0 +1,4 @@
+export interface IDrawerProps {
+  parentDrawerOpen: boolean,
+  setParentDrawerOpen: (_: boolean) => void,
+}
diff --git a/src/types/components/InfiniteScroll/index.ts b/src/types/components/InfiniteScroll/index.ts
new file mode 100644
index 0000000..5443457
--- /dev/null
+++ b/src/types/components/InfiniteScroll/index.ts
@@ -0,0 +1,22 @@
+// Type declaration.
+export type InfiniteScrollState<T> = {
+  allDataFetched: boolean,
+  data: Array<T>,
+  error: string | null,
+  loadingMore: boolean,
+  page: number,
+}
+
+// Interface declaration.
+export interface IInfiniteScroll<T> {
+  activityIndicatorColor?: string,
+  contentBatchSize: number,
+  contentContainerStyles?: Record<string, unknown>,
+  dataFetchQuery: (lastEntry: T | null, pageNumber: number, pageSize: number) => Promise<Array<T>>,
+  errorContainerStyles?: Record<string, unknown>,
+  formatContent: (queryResponseData : T) => JSX.Element,
+  keyExtractorFunction: (item: T) => string,
+  loadingContainerStyles?: Record<string, unknown>,
+  noDataFoundContainerStyles?: Record<string, unknown>,
+  numColumns: number,
+}
diff --git a/src/types/contexts/user/index.ts b/src/types/contexts/user/index.ts
new file mode 100644
index 0000000..2eba55e
--- /dev/null
+++ b/src/types/contexts/user/index.ts
@@ -0,0 +1,9 @@
+import { FirebaseAuthTypes } from '@react-native-firebase/auth';
+
+export interface IContext {
+    currentUser: FirebaseAuthTypes.User | null
+}
+
+export interface IGlobalServiceState {
+  currentUser: FirebaseAuthTypes.User | null
+}
diff --git a/src/types/carousel.ts b/src/types/globals/Carousel/index.ts
similarity index 100%
rename from src/types/carousel.ts
rename to src/types/globals/Carousel/index.ts
diff --git a/src/types/globals/Dialog/index.ts b/src/types/globals/Dialog/index.ts
new file mode 100644
index 0000000..5f95f88
--- /dev/null
+++ b/src/types/globals/Dialog/index.ts
@@ -0,0 +1,5 @@
+export interface IDialogState {
+  open: boolean,
+  title: string,
+  message: string,
+}
diff --git a/src/types/layouts/HeaderLayout/index.ts b/src/types/layouts/HeaderLayout/index.ts
new file mode 100644
index 0000000..c7d989a
--- /dev/null
+++ b/src/types/layouts/HeaderLayout/index.ts
@@ -0,0 +1,41 @@
+import { TextProps, ViewProps } from 'react-native';
+
+export interface ITitleProps extends TextProps {
+  fontFamily?: string,
+  fontSize?: string,
+  color?: string,
+}
+
+export interface IHeaderProps extends ViewProps {
+  maxHeight?: string,
+  height?: string,
+  backgroundColor?: string,
+}
+
+export type HeaderActions = 'back' | 'drawer' | 'share' | 'search' | 'options';
+
+export interface IButtonAction {
+  hidden?: boolean,
+  actionType?: HeaderActions,
+  iconColor?: string,
+  onPress?: () => void,
+}
+
+export interface IRoutesDrawer {
+  path: string,
+  displayName: string,
+  icon: JSX.Element
+}
+
+export interface IHeaderLayoutProps {
+  disableScrollView?: boolean,
+  headerShown: boolean,
+  headerStyles?: IHeaderProps,
+  title: string,
+  titleStyles?: ITitleProps,
+  leftAction: IButtonAction,
+  rightAction: IButtonAction,
+  children: React.ReactNode,
+  drawerRoutes?: Array<IRoutesDrawer>,
+  drawerUser?: boolean
+}
diff --git a/src/types/mocks/MockedNavigation/index.ts b/src/types/mocks/MockedNavigation/index.ts
new file mode 100644
index 0000000..9e59ed3
--- /dev/null
+++ b/src/types/mocks/MockedNavigation/index.ts
@@ -0,0 +1,7 @@
+import React from 'react';
+
+// Interfaces.
+export interface StackScreen {
+  component: React.FC,
+  params?: Record<string, unknown>
+}
diff --git a/src/types/pages/Animal/index.ts b/src/types/pages/Animal/index.ts
new file mode 100644
index 0000000..8557517
--- /dev/null
+++ b/src/types/pages/Animal/index.ts
@@ -0,0 +1,21 @@
+import { DocumentRefData } from '../../services/Firebase';
+
+export interface InterestedUser {
+  id: string;
+  ref: DocumentRefData;
+  imageURI: string;
+  userName: string;
+  birthDate: number;
+}
+
+export interface UserCircleProps {
+  user: InterestedUser;
+  callback: (user: InterestedUser) => void;
+}
+
+// Interface declarations.
+export interface IUploadedPicture {
+  id: string,
+  remoteName: string,
+  localUri: string,
+}
diff --git a/src/types/pages/Login/index.ts b/src/types/pages/Login/index.ts
new file mode 100644
index 0000000..09c3266
--- /dev/null
+++ b/src/types/pages/Login/index.ts
@@ -0,0 +1,4 @@
+export interface ILoginForm {
+  email: string,
+  password: string,
+}
diff --git a/src/types/pages/Registration/index.ts b/src/types/pages/Registration/index.ts
new file mode 100644
index 0000000..6e7a838
--- /dev/null
+++ b/src/types/pages/Registration/index.ts
@@ -0,0 +1,14 @@
+export type picturePath = string | null;
+
+export interface ISignUpForm {
+    fullName: string,
+    birthDate: Date | null,
+    email: string,
+    state: string,
+    city: string,
+    address: string,
+    phoneNumber: string,
+    username: string,
+    password: string,
+    passwordConfirmation: string,
+}
diff --git a/src/types/routes.ts b/src/types/routes.ts
index 913844f..6ff9c65 100644
--- a/src/types/routes.ts
+++ b/src/types/routes.ts
@@ -12,3 +12,15 @@ export type RouteParams = {
     chatUID: string,
   }
 };
+
+export interface IRouteRule {
+  name: string,
+  component: () => JSX.Element,
+  privateComponent?: () => JSX.Element,
+  requireSession?: boolean,
+}
+
+export interface IRoute {
+  name: string,
+  component: () => JSX.Element,
+}
diff --git a/src/types/firebase.ts b/src/types/services/Firebase/index.ts
similarity index 80%
rename from src/types/firebase.ts
rename to src/types/services/Firebase/index.ts
index acbd428..0675d25 100644
--- a/src/types/firebase.ts
+++ b/src/types/services/Firebase/index.ts
@@ -8,3 +8,9 @@ export type Query = FirebaseFirestoreTypes.Query;
 export type QuerySnapshot = FirebaseFirestoreTypes.QuerySnapshot<DocumentData>;
 export type QuerySnapshotDocuments = FirebaseFirestoreTypes.QueryDocumentSnapshot<DocumentData>[];
 export type Timestamp = FirebaseFirestoreTypes.Timestamp;
+
+export type QueryParams = {
+  orderBy? : string | undefined,
+  startAfter? : FirebaseFirestoreTypes.DocumentFieldType | undefined,
+  limit? : number | undefined
+}
diff --git a/src/types/services/Notifications/index.ts b/src/types/services/Notifications/index.ts
new file mode 100644
index 0000000..7b53c25
--- /dev/null
+++ b/src/types/services/Notifications/index.ts
@@ -0,0 +1,35 @@
+import { DocumentData, DocumentRefData } from '../Firebase';
+
+export enum NotificationType {
+  standard = 'STD',
+  adoptionInterest = 'AIN',
+  adoptionRefused = 'ARE',
+}
+
+export interface INotificationAdoptionInterestData {
+  animal: DocumentRefData,
+}
+
+export interface NotificationModel {
+  id: string,
+  from: DocumentData,
+  to: DocumentRefData,
+  message: string,
+  seen: false,
+}
+
+export interface NotificationStandardModel extends NotificationModel {
+  type: NotificationType.standard,
+}
+
+export interface NotificationAdoptionModel extends NotificationModel {
+  type: NotificationType.adoptionInterest,
+  animal: DocumentData,
+}
+
+export interface NotificationAdoptionRefusedModel extends NotificationModel {
+  type: NotificationType.adoptionRefused,
+  animal: DocumentData,
+}
+
+export type NotificationModels = NotificationStandardModel | NotificationAdoptionModel | NotificationAdoptionRefusedModel;
diff --git a/src/types/services/Paginated/index.ts b/src/types/services/Paginated/index.ts
new file mode 100644
index 0000000..663e7c7
--- /dev/null
+++ b/src/types/services/Paginated/index.ts
@@ -0,0 +1,7 @@
+export interface PaginatedMetaData {
+  pageNumber: number;
+  pageSize: number;
+  lastElementMarker: unknown[];
+  marker: string;
+  orderByDirection?: 'asc' | 'desc';
+}