diff --git a/solution/Dockerfile b/solution/Dockerfile
index f41cea9..98e52b0 100644
--- a/solution/Dockerfile
+++ b/solution/Dockerfile
@@ -4,6 +4,7 @@ WORKDIR /app
 
 ENV PYTHONDONTWRITEBYTECODE 1
 ENV PYTHONUNBUFFERED 1
+ENV SERVER_ADDRESS = 0.0.0.0
 ENV SERVER_PORT=8080
 ENV DJANGO_DEBUG = False
 
@@ -15,4 +16,4 @@ WORKDIR /app
 
 COPY . .
 
-CMD ["sh", "-c", "cd pulse && exec python3 manage.py runserver 0.0.0.0:$SERVER_PORT"]
+CMD ["sh", "-c", "cd pulse && exec python3 manage.py runserver $SERVER_ADDRESS:$SERVER_PORT"]
diff --git a/solution/pulse/countries/__init__.py b/solution/pulse/countries/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/solution/pulse/countries/apps.py b/solution/pulse/countries/apps.py
new file mode 100644
index 0000000..12ce5ef
--- /dev/null
+++ b/solution/pulse/countries/apps.py
@@ -0,0 +1,6 @@
+from django.apps import AppConfig
+
+
+class CountriesConfig(AppConfig):
+    default_auto_field = "django.db.models.BigAutoField"
+    name = "countries"
diff --git a/solution/pulse/countries/migrations/0001_initial.py b/solution/pulse/countries/migrations/0001_initial.py
new file mode 100644
index 0000000..dea5fca
--- /dev/null
+++ b/solution/pulse/countries/migrations/0001_initial.py
@@ -0,0 +1,24 @@
+# Generated by Django 4.2.10 on 2024-02-27 18:38
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    initial = True
+
+    dependencies = [
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='Country',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('name', models.CharField(max_length=100)),
+                ('alpha2', models.CharField(max_length=2)),
+                ('alpha3', models.CharField(max_length=3)),
+                ('region', models.CharField()),
+            ],
+        ),
+    ]
diff --git a/solution/pulse/countries/migrations/__init__.py b/solution/pulse/countries/migrations/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/solution/pulse/countries/models.py b/solution/pulse/countries/models.py
new file mode 100644
index 0000000..b288235
--- /dev/null
+++ b/solution/pulse/countries/models.py
@@ -0,0 +1,11 @@
+from django.db import models
+
+
+class Country(models.Model):
+    name = models.CharField(max_length=100)
+    alpha2 = models.CharField(max_length=2)
+    alpha3 = models.CharField(max_length=3)
+    region = models.CharField()
+
+    def __str__(self):
+        return self.name
diff --git a/solution/pulse/countries/serializers.py b/solution/pulse/countries/serializers.py
new file mode 100644
index 0000000..10cfd38
--- /dev/null
+++ b/solution/pulse/countries/serializers.py
@@ -0,0 +1,9 @@
+from rest_framework import serializers
+
+from countries.models import Country
+
+
+class CountrySerializer(serializers.ModelSerializer):
+    class Meta:
+        model = Country
+        fields = ["name", "alpha2", "alpha3", "region"]
diff --git a/solution/pulse/countries/urls.py b/solution/pulse/countries/urls.py
new file mode 100644
index 0000000..f47ea71
--- /dev/null
+++ b/solution/pulse/countries/urls.py
@@ -0,0 +1,12 @@
+from django.urls import path
+
+import countries.views
+
+urlpatterns = [
+    path("", countries.views.CountryListView.as_view(), name="countries"),
+    path(
+        "<str:alpha2>/",
+        countries.views.CountryByAlpha2View.as_view(),
+        name="country_by_alpha2",
+    ),
+]
diff --git a/solution/pulse/countries/views.py b/solution/pulse/countries/views.py
new file mode 100644
index 0000000..b9e4a84
--- /dev/null
+++ b/solution/pulse/countries/views.py
@@ -0,0 +1,16 @@
+from rest_framework.generics import ListAPIView, RetrieveAPIView
+
+from countries.models import Country
+from countries.serializers import CountrySerializer
+
+
+class CountryListView(ListAPIView):
+    queryset = Country.objects.all().order_by("alpha2")
+    filterset_fields = ["region"]
+    serializer_class = CountrySerializer
+
+
+class CountryByAlpha2View(RetrieveAPIView):
+    queryset = Country.objects.all()
+    serializer_class = CountrySerializer
+    lookup_field = "alpha2"
diff --git a/solution/pulse/pulse/settings.py b/solution/pulse/pulse/settings.py
index e159905..62a52a8 100644
--- a/solution/pulse/pulse/settings.py
+++ b/solution/pulse/pulse/settings.py
@@ -1,6 +1,7 @@
 import os
 from pathlib import Path
 
+import dj_database_url
 from dotenv import load_dotenv
 
 load_dotenv()
@@ -13,6 +14,8 @@ DEBUG = os.getenv("DJANGO_DEBUG", "true").lower() in ("true", "1", "yes", "y")
 
 ALLOWED_HOSTS = os.getenv("DJANGO_ALLOWED_HOSTS", "*").split(" ")
 
+INTERNAL_IPS = os.getenv("DJANGO_INTERNAL_IPS", "127.0.0.1").split(" ")
+
 INSTALLED_APPS = [
     "django.contrib.admin",
     "django.contrib.auth",
@@ -22,8 +25,10 @@ INSTALLED_APPS = [
     "django.contrib.staticfiles",
     # Third-party apps
     "rest_framework",
+    "django_filters",
     # Developed apps
     "ping.apps.PingConfig",
+    "countries.apps.CountriesConfig",
 ]
 
 MIDDLEWARE = [
@@ -56,10 +61,12 @@ TEMPLATES = [
 
 WSGI_APPLICATION = "pulse.wsgi.application"
 
+POSTGRES_CONN = os.getenv("POSTGRES_CONN")
+
 DATABASES = {
     "default": {
-        "ENGINE": "django.db.backends.sqlite3",
-        "NAME": BASE_DIR / "db.sqlite3",
+        "ENGINE": "django.db.backends.postgresql",
+        **dj_database_url.parse(POSTGRES_CONN),
     },
 }
 
@@ -99,12 +106,12 @@ STATIC_URL = "static/"
 
 DEFAULT_AUTO_FIELD = "django.db.models.BigAutoField"
 
+REST_FRAMEWORK = {
+    "DEFAULT_FILTER_BACKENDS": [
+        "django_filters.rest_framework.DjangoFilterBackend"
+    ]
+}
+
 if DEBUG:
-    INSTALLED_APPS.append("debug_toolbar")
+    INSTALLED_APPS.insert(0, "debug_toolbar")
     MIDDLEWARE.append("debug_toolbar.middleware.DebugToolbarMiddleware")
-else:
-    REST_FRAMEWORK = {
-        "DEFAULT_RENDERER_CLASSES": [
-            "rest_framework.renderers.JSONRenderer",
-        ],
-    }
diff --git a/solution/pulse/pulse/urls.py b/solution/pulse/pulse/urls.py
index 340ccd3..3d9904b 100644
--- a/solution/pulse/pulse/urls.py
+++ b/solution/pulse/pulse/urls.py
@@ -6,14 +6,15 @@ urlpatterns = [
     # Built-in urls
     path("admin/", admin.site.urls),
     path(
-        "api-auth/", include(
-            "rest_framework.urls", namespace="rest_framework",
+        "api-auth/",
+        include(
+            "rest_framework.urls",
+            namespace="rest_framework",
         ),
     ),
-
     # API
-
     path("api/ping/", include("ping.urls")),
+    path("api/countries/", include("countries.urls")),
 ]
 
 if settings.DEBUG:
diff --git a/solution/requirements/prod.txt b/solution/requirements/prod.txt
index 0d4898e..57680ab 100644
--- a/solution/requirements/prod.txt
+++ b/solution/requirements/prod.txt
@@ -1,3 +1,6 @@
 django==4.2.10
 djangorestframework==3.14.0
 python-dotenv==1.0.1
+psycopg2-binary==2.9.9
+dj-database-url==2.1.0
+django-filter==23.5
diff --git a/solution/ruff.toml b/solution/ruff.toml
index 0d3bab9..5334195 100644
--- a/solution/ruff.toml
+++ b/solution/ruff.toml
@@ -8,7 +8,7 @@ indent-width = 4
 
 [lint]
 select = ["ALL"]
-ignore = ["D", "ANN", "ARG"]
+ignore = ["D", "ANN", "ARG", "ISC001", "COM812", "RUF012"]
 
 [format]
 quote-style = "double"
diff --git a/solution/template.env b/solution/template.env
index 20eedb5..7170c0a 100644
--- a/solution/template.env
+++ b/solution/template.env
@@ -1,3 +1,5 @@
 DJANGO_DEBUG = False
-SECRET_KEY = fake
+SECRET_KEY = secret_key
 DJANGO_ALLOWED_HOSTS = 127.0.0.1
+INTERNAL_IPS = 127.0.0.1
+POSTGRES_CONN = postgres://login:pass@localhost:5432/postgres