diff --git a/.eslintrc.js b/.eslintrc.js
index c417de3..649d93b 100644
--- a/.eslintrc.js
+++ b/.eslintrc.js
@@ -18,6 +18,7 @@ module.exports = {
   },
   ignorePatterns: ['.eslintrc.js'],
   rules: {
+    '@typescript-eslint/no-invalid-void-type': ['error', { allowAsThisParameter: true }],
     '@typescript-eslint/interface-name-prefix': 'off',
     '@typescript-eslint/explicit-function-return-type': 'off',
     '@typescript-eslint/explicit-module-boundary-types': 'off'
diff --git a/src/app.controller.spec.ts b/src/app.controller.spec.ts
deleted file mode 100644
index 2552ec5..0000000
--- a/src/app.controller.spec.ts
+++ /dev/null
@@ -1,22 +0,0 @@
-import { Test, TestingModule } from '@nestjs/testing';
-import { AppController } from './app.controller';
-import { AppService } from './app.service';
-
-describe('AppController', () => {
-    let appController: AppController;
-
-    beforeEach(async () => {
-        const app: TestingModule = await Test.createTestingModule({
-            controllers: [AppController],
-            providers: [AppService],
-        }).compile();
-
-        appController = app.get<AppController>(AppController);
-    });
-
-    describe('root', () => {
-        it('should return "Hello World!"', () => {
-            expect(appController.getHello()).toBe('Hello World!');
-        });
-    });
-});
diff --git a/src/app.controller.ts b/src/app.controller.ts
deleted file mode 100644
index a325e8b..0000000
--- a/src/app.controller.ts
+++ /dev/null
@@ -1,12 +0,0 @@
-import { Controller, Get } from '@nestjs/common';
-import { AppService } from './app.service';
-
-@Controller()
-export class AppController {
-    constructor(private readonly appService: AppService) {}
-
-    @Get()
-    getHello(): string {
-        return this.appService.getHello();
-    }
-}
diff --git a/src/app.module.ts b/src/app.module.ts
index 30914da..fcc470a 100644
--- a/src/app.module.ts
+++ b/src/app.module.ts
@@ -1,11 +1,36 @@
-import { Module } from '@nestjs/common';
-import { AppController } from './app.controller';
-import { AppService } from './app.service';
+import { createOsmClientWithCache } from './clients/geocoding';
+import { createOpenmeteoClientWithCache } from './clients/weather';
+import {
+    Module,
+    geocodingProviderDependency,
+    packagesRepositoryDependency,
+    packagesServiceDependency,
+    weatherProviderDependency,
+} from './dependencies';
+import { PackagesController } from './packages.controller';
+import { PackagesService } from './packages.service';
+import { createSamplePackagesRepository } from './storage/samplePackagesRepository';
 
 @Module({
-    imports: [],
-    controllers: [AppController],
-    providers: [AppService],
+    controllers: [PackagesController],
+    providers: [
+        {
+            provide: packagesServiceDependency,
+            useClass: PackagesService,
+        },
+        {
+            provide: geocodingProviderDependency,
+            useValue: createOsmClientWithCache(),
+        },
+        {
+            provide: weatherProviderDependency,
+            useValue: createOpenmeteoClientWithCache(),
+        },
+        {
+            provide: packagesRepositoryDependency,
+            useFactory: createSamplePackagesRepository,
+        },
+    ],
 })
 
 // eslint-disable-next-line @typescript-eslint/no-extraneous-class
diff --git a/src/clients/geocoding.ts b/src/clients/geocoding.ts
new file mode 100644
index 0000000..00cfbce
--- /dev/null
+++ b/src/clients/geocoding.ts
@@ -0,0 +1,14 @@
+import { createOsmClient } from '../integration/geocoding/osm';
+import { GeocodingProvider } from '../integration/geocoding/types';
+import { createCachedDataProvider } from '../storage/cache';
+import { createKeyValueStorage } from '../storage/inMemoryDB';
+
+export const createOsmClientWithCache = (): GeocodingProvider => {
+    return {
+        geocode: createCachedDataProvider({
+            cacheStorage: createKeyValueStorage(20),
+            getNewValue: createOsmClient().geocode,
+            ttlMs: 86_400_000,
+        }),
+    };
+};
diff --git a/src/clients/weather.ts b/src/clients/weather.ts
new file mode 100644
index 0000000..6ce3566
--- /dev/null
+++ b/src/clients/weather.ts
@@ -0,0 +1,14 @@
+import { createOpenmeteoClient } from '../integration/weather/openmeteo';
+import { WeatherProvider } from '../integration/weather/types';
+import { createCachedDataProvider } from '../storage/cache';
+import { createKeyValueStorage } from '../storage/inMemoryDB';
+
+export const createOpenmeteoClientWithCache = (): WeatherProvider => {
+    return {
+        getCurrentWeather: createCachedDataProvider({
+            cacheStorage: createKeyValueStorage(20),
+            getNewValue: createOpenmeteoClient().getCurrentWeather,
+            ttlMs: 7_200_000,
+        }),
+    };
+};
diff --git a/src/clients/weather/types.ts b/src/clients/weather/types.ts
deleted file mode 100644
index 871ea2b..0000000
--- a/src/clients/weather/types.ts
+++ /dev/null
@@ -1,10 +0,0 @@
-export type WeatherProvider = {
-    getCurrentWeather(params: {
-        longitude: number;
-        latitude: number;
-    }): Promise<{
-        temperature: string;
-        apparentTemperature: string;
-        relativeHumidity: string;
-    }>;
-};
diff --git a/src/dependencies.ts b/src/dependencies.ts
index 3f10440..88938d2 100644
--- a/src/dependencies.ts
+++ b/src/dependencies.ts
@@ -1,6 +1,7 @@
+import { Module as NestModule } from '@nestjs/common';
 import { Test, TestingModuleBuilder } from '@nestjs/testing';
-import { GeocodingProvider } from './clients/geocoding/types';
-import { WeatherProvider } from './clients/weather/types';
+import { GeocodingProvider } from './integration/geocoding/types';
+import { WeatherProvider } from './integration/weather/types';
 import { PackagesService } from './packages.service';
 import { PackagesRepository } from './storage/types';
 
@@ -18,11 +19,27 @@ export type Dependencies = {
 
 export type Dependency<T extends keyof Dependencies> = Dependencies[T];
 
+type ProviderImplementation<TProvider> =
+    | {
+          useValue: TProvider;
+      }
+    | {
+          // Quick workaround instead of extracting relevant types from @nestjs/types
+          // (which are not really very different from `any` anyway)
+          // eslint-disable-next-line @typescript-eslint/no-explicit-any
+          useClass: new (...args: any[]) => TProvider;
+      }
+    | {
+          // Quick workaround instead of extracting relevant types from @nestjs/types
+          // (which are not really very different from `any` anyway)
+          // eslint-disable-next-line @typescript-eslint/no-explicit-any
+          useFactory: (...args: any[]) => TProvider | Promise<TProvider>;
+      };
+
 type ProviderDictionary = {
     [TKey in keyof Dependencies]: {
         provide: TKey;
-        useValue: Dependencies[TKey];
-    };
+    } & ProviderImplementation<Dependencies[TKey]>;
 };
 
 type Provider = ProviderDictionary[keyof ProviderDictionary];
@@ -38,3 +55,5 @@ type ModuleMetadata = {
 export const createTestingModule: (
     metadata: ModuleMetadata,
 ) => TestingModuleBuilder = Test.createTestingModule.bind(Test);
+
+export const Module: (metadata: ModuleMetadata) => ClassDecorator = NestModule;
diff --git a/src/clients/geocoding/osm.spec.ts b/src/integration/geocoding/osm.spec.ts
similarity index 100%
rename from src/clients/geocoding/osm.spec.ts
rename to src/integration/geocoding/osm.spec.ts
diff --git a/src/clients/geocoding/osm.ts b/src/integration/geocoding/osm.ts
similarity index 100%
rename from src/clients/geocoding/osm.ts
rename to src/integration/geocoding/osm.ts
diff --git a/src/clients/geocoding/types.ts b/src/integration/geocoding/types.ts
similarity index 57%
rename from src/clients/geocoding/types.ts
rename to src/integration/geocoding/types.ts
index 3acad6a..180489b 100644
--- a/src/clients/geocoding/types.ts
+++ b/src/integration/geocoding/types.ts
@@ -1,5 +1,8 @@
 export type GeocodingProvider = {
-    geocode(query: string): Promise<{
+    geocode(
+        this: void,
+        query: string,
+    ): Promise<{
         longitude: number;
         latitude: number;
     }>;
diff --git a/src/clients/weather/openmeteo.spec.ts b/src/integration/weather/openmeteo.spec.ts
similarity index 100%
rename from src/clients/weather/openmeteo.spec.ts
rename to src/integration/weather/openmeteo.spec.ts
diff --git a/src/clients/weather/openmeteo.ts b/src/integration/weather/openmeteo.ts
similarity index 100%
rename from src/clients/weather/openmeteo.ts
rename to src/integration/weather/openmeteo.ts
diff --git a/src/integration/weather/types.ts b/src/integration/weather/types.ts
new file mode 100644
index 0000000..2bd2878
--- /dev/null
+++ b/src/integration/weather/types.ts
@@ -0,0 +1,13 @@
+export type WeatherProvider = {
+    getCurrentWeather(
+        this: void,
+        params: {
+            longitude: number;
+            latitude: number;
+        },
+    ): Promise<{
+        temperature: string;
+        apparentTemperature: string;
+        relativeHumidity: string;
+    }>;
+};
diff --git a/src/packages.service.spec.ts b/src/packages.service.spec.ts
index bfeee6e..ccd5f2d 100644
--- a/src/packages.service.spec.ts
+++ b/src/packages.service.spec.ts
@@ -1,5 +1,5 @@
-import { GeocodingProvider } from './clients/geocoding/types';
-import { WeatherProvider } from './clients/weather/types';
+import { GeocodingProvider } from './integration/geocoding/types';
+import { WeatherProvider } from './integration/weather/types';
 import { PackagesService } from './packages.service';
 import { PackageInfo, PackagesRepository } from './storage/types';