diff --git a/partner_programs/views.py b/partner_programs/views.py
index 36acf5cb..c520ac3b 100644
--- a/partner_programs/views.py
+++ b/partner_programs/views.py
@@ -55,7 +55,9 @@ def get(self, request, *args, **kwargs):
 
 class PartnerProgramCreateUserAndRegister(generics.GenericAPIView):
     """
-    Create new user and register him to program and save additional data
+    Create new user and register him to program and save additional data.
+    If a user with such an email already exists in the system, then his profile
+    remains the same, but he registers in the program with the specified data.
     """
 
     permission_classes = [AllowAny]
@@ -93,32 +95,34 @@ def post(self, request, *args, **kwargs):
             "patronymic",
             "city",
         )
-        try:
-            user = User.objects.create(
+        user, created = User.objects.get_or_create(
+            email=email,
+            defaults={
+                "birthday": date_to_iso(data.get("birthday", "01-01-1900")),
+                "is_active": True,  # bypass email verification
+                "onboarding_stage": None,  # bypass onboarding
+                "verification_date": timezone.now(),  # bypass ClickUp verification
                 **{field_name: data.get(field_name, "") for field_name in user_fields},
-                birthday=date_to_iso(data.get("birthday", "01-01-1900")),
-                is_active=True,  # bypass email verification
-                onboarding_stage=None,  # bypass onboarding
-                verification_date=timezone.now(),  # bypass ClickUp verification
-                email=email,
+            }
+        )
+        if created:  # Only when registering a new user.
+            user.set_password(password)
+            user.save()
+
+        user_profile_program_data = {
+            k: v for k, v in data.items() if k not in user_fields and k != "password"
+        }
+        try:
+            PartnerProgramUserProfile.objects.create(
+                partner_program_data=user_profile_program_data,
+                user=user,
+                partner_program=program,
             )
         except IntegrityError:
             return Response(
-                data={"detail": "User with this email already exists."},
+                data={"detail": "User has already registered in this program."},
                 status=status.HTTP_400_BAD_REQUEST,
             )
-
-        user.set_password(password)
-        user.save()
-
-        user_profile_program_data = {
-            k: v for k, v in data.items() if k not in user_fields and k != "password"
-        }
-        PartnerProgramUserProfile.objects.create(
-            partner_program_data=user_profile_program_data,
-            user=user,
-            partner_program=program,
-        )
         return Response(status=status.HTTP_201_CREATED)
 
     def get(self, request, *args, **kwargs):
diff --git a/projects/serializers.py b/projects/serializers.py
index dccfb049..05371f30 100644
--- a/projects/serializers.py
+++ b/projects/serializers.py
@@ -8,11 +8,34 @@
 from industries.models import Industry
 from projects.models import Project, Achievement, Collaborator, ProjectNews
 from projects.validators import validate_project
-from vacancy.serializers import ProjectVacancyListSerializer
+from vacancy.models import Vacancy
 
 User = get_user_model()
 
 
+class ProjectVacancyListSerializer(serializers.ModelSerializer):
+    datetime_closed = serializers.DateTimeField(read_only=True)
+    response_count = serializers.SerializerMethodField(read_only=True)
+    required_skills = SkillToObjectSerializer(many=True, read_only=True)
+
+    class Meta:
+        model = Vacancy
+        fields = [
+            "id",
+            "role",
+            "required_skills",
+            "description",
+            "project",
+            "is_active",
+            "datetime_closed",
+            "response_count",
+        ]
+
+    def get_response_count(self, obj):
+        """Returns count non status responses."""
+        return obj.vacancy_requests.filter(is_approved=None).count()
+
+
 class AchievementListSerializer(serializers.ModelSerializer):
     class Meta:
         model = Achievement
diff --git a/vacancy/serializers.py b/vacancy/serializers.py
index 8e936254..5b774b4a 100644
--- a/vacancy/serializers.py
+++ b/vacancy/serializers.py
@@ -4,11 +4,10 @@
 
 from core.models import Skill, SkillToObject
 from core.serializers import SkillToObjectSerializer
-from core.services import get_views_count
 from files.models import UserFile
 from files.serializers import UserFileSerializer
 from projects.models import Project
-from projects.validators import validate_project
+from projects.serializers import ProjectListSerializer
 from users.serializers import UserDetailSerializer
 from vacancy.models import Vacancy, VacancyResponse
 
@@ -36,25 +35,6 @@ def get_response_count(self, obj):
         return obj.vacancy_requests.filter(is_approved=None).count()
 
 
-class ProjectVacancyListSerializer(
-    serializers.ModelSerializer,
-    AbstractVacancyReadOnlyFields,
-    RequiredSkillsSerializerMixin[Vacancy],
-):
-    class Meta:
-        model = Vacancy
-        fields = [
-            "id",
-            "role",
-            "required_skills",
-            "description",
-            "project",
-            "is_active",
-            "datetime_closed",
-            "response_count",
-        ]
-
-
 class ProjectForVacancySerializer(serializers.ModelSerializer[Project]):
     class Meta:
         model = Project
@@ -112,40 +92,6 @@ class Meta:
         ]
 
 
-class ProjectListSerializer(serializers.ModelSerializer):
-    views_count = serializers.SerializerMethodField(method_name="count_views")
-    short_description = serializers.SerializerMethodField()
-
-    @classmethod
-    def count_views(cls, project):
-        return get_views_count(project)
-
-    @classmethod
-    def get_short_description(cls, project):
-        return project.get_short_description()
-
-    class Meta:
-        model = Project
-        fields = [
-            "id",
-            "name",
-            "leader",
-            "short_description",
-            "image_address",
-            "industry",
-            "views_count",
-        ]
-
-        read_only_fields = ["leader", "views_count"]
-
-    def is_valid(self, *, raise_exception=False):
-        return super().is_valid(raise_exception=raise_exception)
-
-    def validate(self, data):
-        super().validate(data)
-        return validate_project(data)
-
-
 class ProjectVacancyCreateListSerializer(
     serializers.ModelSerializer,
     AbstractVacancyReadOnlyFields,