diff --git a/class_social/db.py b/class_social/db.py
index 1ef7ac8..b81242d 100644
--- a/class_social/db.py
+++ b/class_social/db.py
@@ -21,6 +21,11 @@ def load_users():
         return []
 
 
+def save_posts(posts):
+    with open('posts.pickle', 'wb') as file:
+        pickle.dump(posts, file)
+
+
 def load_posts():
     try:
         with open('posts.pickle', 'rb') as file:
diff --git a/class_social/models.py b/class_social/models.py
index 08711bb..a7904db 100644
--- a/class_social/models.py
+++ b/class_social/models.py
@@ -16,6 +16,7 @@ class User(BaseModel):
     address: str
     website: Optional[str]
     connections: Optional[List['User']]
+    # connections: Optional[List['User']]
     about: Optional[str]
     role: Optional[str]
 
@@ -71,8 +72,8 @@ class Post(BaseModel):
     creator: User
     creation_date: datetime
     comments_on_this_post: Optional[List[str]]
-    likes_for_this_post: Optional[List[Union[Student, Teacher, Institution]]]
-    shares_for_this_post: Optional[List[Union[Student, Teacher, Institution]]]
+    likes_for_this_post: Optional[List[str]]
+    #likes_for_this_post: Optional[List[Union['Student', 'Teacher', 'Institution']]]
+    #shares_for_this_post: Optional[List[Union['Student', 'Teacher', 'Institution']]]
+    shares_for_this_post: Optional[List[str]]
     type_of_post: str
-
-
diff --git a/class_social/posts.py b/class_social/posts.py
index b450e1e..55f9c31 100644
--- a/class_social/posts.py
+++ b/class_social/posts.py
@@ -1,5 +1,7 @@
-from fastapi import APIRouter, HTTPException
+from fastapi import HTTPException, APIRouter
+
 from class_social import db
+from class_social.models import Post
 from class_social.db import DBException
 
 
@@ -8,33 +10,53 @@ class PostControllerError(Exception):
 
 
 class PostController:
-    def get_posts_by_creator_role(self, role):
-        result_post = []
 
-        posts_list = db.load_posts()
+    def post_a_post(self, post):
+        try:
+            post_list = db.load_posts()
+            post_list.append(post)
+            db.save_posts(post_list)
+        except DBException:
+            raise PostControllerError('Wrong format')
 
+    def get_posts_by_username(self, username):
+        posts_list = db.load_posts()
+        user_posts = []
         for post in posts_list:
+            if post.creator.username == username:
+                user_posts.append(post)
+        return user_posts
 
+    def get_posts_by_creator_role(self, role):
+        result_post = []
+        posts_list = db.load_posts()
+        for post in posts_list:
             if post.creator.role == role:
-
                  result_post.append(post)
-
         return result_post
 
 
-
 # API Routes
-
 posts_routes = APIRouter()
 post_controller = PostController()
 
+@post_routes.post('/posts')
+def insert_posts(post: Post) -> Post:
+    post = post_controller.post_a_post(post)
+    return post
+
+@post_routes.get('/posts/{username}')
+def get_posts_by_username(username: str):
+    post = post_controller.get_posts_by_username(username)
+    if post is not None:
+        return post
+
+    raise HTTPException(status_code=404)
 
 @posts_routes.get('/posts/creator/{role}')
 def get_posts_by_creator_role(role: str):
     post = post_controller.get_posts_by_creator_role(role)
-
     if post is not None:
         return post
 
     raise HTTPException(status_code=404)
-
diff --git a/tests/test_post_routes.py b/tests/test_post_routes.py
index 8ddc22f..7acf789 100644
--- a/tests/test_post_routes.py
+++ b/tests/test_post_routes.py
@@ -1,9 +1,7 @@
 import datetime
 from unittest.mock import patch, Mock
-
 import pytest
 from fastapi.testclient import TestClient
-
 from class_social.main import app
 
 
@@ -11,6 +9,32 @@
 def http_test_client():
     return TestClient(app)
 
+post_user = {
+    "id": '1234',
+    "name": 'Wasi',
+    "username": 'wasi',
+    "password": 'somepass',
+    "email": 'wasi@mathias',
+    "created_on": "2023-03-27T00:00:00.000+00:00",
+    "is_active": True,
+    "address": 'some address 123'
+}
+    # {"w1","wasi", "123456w","wasi@atwasi.c","2023-03-27T00:00:00.000+00:00",True,"Wasi","someaddress 123","wasi.co","con1","about me about me"}, # TODO a user dictionary here OR remove it completely!!
+
+
+valid_post = {
+    "title": 'Our First Post',
+    "body": 'Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam' \
+            ' nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, s' \
+            'ed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd g' \
+            'ubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet. Lorem ipsum dolor sit amet, consetetur sadipscing elitr, ' \
+            'sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo' \
+            ' duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet.',
+    "creator": post_user, # TODO a user dictionary here OR remove it completely!!
+    "creation_date": '2023-03-27T00:00:00.000+00:00',
+    "type_of_post": 'some type'
+}
+
 valid_post_list = [{
     'title': 'Some_title',
     'body': 'text_content',
@@ -42,3 +66,15 @@ def test_given_a_nonexistent_creator_role_system_must_return_404_ok(http_test_cl
         controller_mock.get_posts_by_creator_role = Mock(return_value=None)
         response = http_test_client.get('/posts/creator/anything')
         assert response.status_code == 404
+
+
+def test_given_invalid_new_post_format_422(http_test_client):
+    response = http_test_client.post('/posts', json={})
+    assert response.status_code == 422
+
+
+def test_given_valid_new_post_entry_the_system_must_submit_the_post_and_return_200_ok(http_test_client):
+    with patch('class_social.posts.post_controller') as controller_mock:
+        controller_mock.post_a_post = Mock(return_value=None)
+        response = http_test_client.post('/posts', json=valid_post)
+        assert response.status_code == 200