diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..7b62f12
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+__pycache__
+.vscode
\ No newline at end of file
diff --git a/poetry.lock b/poetry.lock
new file mode 100644
index 0000000..dee7d46
--- /dev/null
+++ b/poetry.lock
@@ -0,0 +1,203 @@
+[[package]]
+name = "atomicwrites"
+version = "1.4.0"
+description = "Atomic file writes."
+category = "main"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+
+[[package]]
+name = "attrs"
+version = "21.2.0"
+description = "Classes Without Boilerplate"
+category = "main"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+
+[package.extras]
+dev = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "mypy", "pytest-mypy-plugins", "zope.interface", "furo", "sphinx", "sphinx-notfound-page", "pre-commit"]
+docs = ["furo", "sphinx", "zope.interface", "sphinx-notfound-page"]
+tests = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "mypy", "pytest-mypy-plugins", "zope.interface"]
+tests_no_zope = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "mypy", "pytest-mypy-plugins"]
+
+[[package]]
+name = "colorama"
+version = "0.4.4"
+description = "Cross-platform colored terminal text."
+category = "main"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+
+[[package]]
+name = "iniconfig"
+version = "1.1.1"
+description = "iniconfig: brain-dead simple config-ini parsing"
+category = "main"
+optional = false
+python-versions = "*"
+
+[[package]]
+name = "packaging"
+version = "20.9"
+description = "Core utilities for Python packages"
+category = "main"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+
+[package.dependencies]
+pyparsing = ">=2.0.2"
+
+[[package]]
+name = "pluggy"
+version = "0.13.1"
+description = "plugin and hook calling mechanisms for python"
+category = "main"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+
+[package.extras]
+dev = ["pre-commit", "tox"]
+
+[[package]]
+name = "py"
+version = "1.10.0"
+description = "library with cross-python path, ini-parsing, io, code, log facilities"
+category = "main"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+
+[[package]]
+name = "pydantic"
+version = "1.8.2"
+description = "Data validation and settings management using python 3.6 type hinting"
+category = "main"
+optional = false
+python-versions = ">=3.6.1"
+
+[package.dependencies]
+typing-extensions = ">=3.7.4.3"
+
+[package.extras]
+dotenv = ["python-dotenv (>=0.10.4)"]
+email = ["email-validator (>=1.0.3)"]
+
+[[package]]
+name = "pyparsing"
+version = "2.4.7"
+description = "Python parsing module"
+category = "main"
+optional = false
+python-versions = ">=2.6, !=3.0.*, !=3.1.*, !=3.2.*"
+
+[[package]]
+name = "pytest"
+version = "6.2.4"
+description = "pytest: simple powerful testing with Python"
+category = "main"
+optional = false
+python-versions = ">=3.6"
+
+[package.dependencies]
+atomicwrites = {version = ">=1.0", markers = "sys_platform == \"win32\""}
+attrs = ">=19.2.0"
+colorama = {version = "*", markers = "sys_platform == \"win32\""}
+iniconfig = "*"
+packaging = "*"
+pluggy = ">=0.12,<1.0.0a1"
+py = ">=1.8.2"
+toml = "*"
+
+[package.extras]
+testing = ["argcomplete", "hypothesis (>=3.56)", "mock", "nose", "requests", "xmlschema"]
+
+[[package]]
+name = "toml"
+version = "0.10.2"
+description = "Python Library for Tom's Obvious, Minimal Language"
+category = "main"
+optional = false
+python-versions = ">=2.6, !=3.0.*, !=3.1.*, !=3.2.*"
+
+[[package]]
+name = "typing-extensions"
+version = "3.10.0.0"
+description = "Backported and Experimental Type Hints for Python 3.5+"
+category = "main"
+optional = false
+python-versions = "*"
+
+[metadata]
+lock-version = "1.1"
+python-versions = "^3.9"
+content-hash = "c5dca7477154be53f96d281ccd757e341315c748be9648e87a29098d47fa11af"
+
+[metadata.files]
+atomicwrites = [
+    {file = "atomicwrites-1.4.0-py2.py3-none-any.whl", hash = "sha256:6d1784dea7c0c8d4a5172b6c620f40b6e4cbfdf96d783691f2e1302a7b88e197"},
+    {file = "atomicwrites-1.4.0.tar.gz", hash = "sha256:ae70396ad1a434f9c7046fd2dd196fc04b12f9e91ffb859164193be8b6168a7a"},
+]
+attrs = [
+    {file = "attrs-21.2.0-py2.py3-none-any.whl", hash = "sha256:149e90d6d8ac20db7a955ad60cf0e6881a3f20d37096140088356da6c716b0b1"},
+    {file = "attrs-21.2.0.tar.gz", hash = "sha256:ef6aaac3ca6cd92904cdd0d83f629a15f18053ec84e6432106f7a4d04ae4f5fb"},
+]
+colorama = [
+    {file = "colorama-0.4.4-py2.py3-none-any.whl", hash = "sha256:9f47eda37229f68eee03b24b9748937c7dc3868f906e8ba69fbcbdd3bc5dc3e2"},
+    {file = "colorama-0.4.4.tar.gz", hash = "sha256:5941b2b48a20143d2267e95b1c2a7603ce057ee39fd88e7329b0c292aa16869b"},
+]
+iniconfig = [
+    {file = "iniconfig-1.1.1-py2.py3-none-any.whl", hash = "sha256:011e24c64b7f47f6ebd835bb12a743f2fbe9a26d4cecaa7f53bc4f35ee9da8b3"},
+    {file = "iniconfig-1.1.1.tar.gz", hash = "sha256:bc3af051d7d14b2ee5ef9969666def0cd1a000e121eaea580d4a313df4b37f32"},
+]
+packaging = [
+    {file = "packaging-20.9-py2.py3-none-any.whl", hash = "sha256:67714da7f7bc052e064859c05c595155bd1ee9f69f76557e21f051443c20947a"},
+    {file = "packaging-20.9.tar.gz", hash = "sha256:5b327ac1320dc863dca72f4514ecc086f31186744b84a230374cc1fd776feae5"},
+]
+pluggy = [
+    {file = "pluggy-0.13.1-py2.py3-none-any.whl", hash = "sha256:966c145cd83c96502c3c3868f50408687b38434af77734af1e9ca461a4081d2d"},
+    {file = "pluggy-0.13.1.tar.gz", hash = "sha256:15b2acde666561e1298d71b523007ed7364de07029219b604cf808bfa1c765b0"},
+]
+py = [
+    {file = "py-1.10.0-py2.py3-none-any.whl", hash = "sha256:3b80836aa6d1feeaa108e046da6423ab8f6ceda6468545ae8d02d9d58d18818a"},
+    {file = "py-1.10.0.tar.gz", hash = "sha256:21b81bda15b66ef5e1a777a21c4dcd9c20ad3efd0b3f817e7a809035269e1bd3"},
+]
+pydantic = [
+    {file = "pydantic-1.8.2-cp36-cp36m-macosx_10_9_x86_64.whl", hash = "sha256:05ddfd37c1720c392f4e0d43c484217b7521558302e7069ce8d318438d297739"},
+    {file = "pydantic-1.8.2-cp36-cp36m-manylinux1_i686.whl", hash = "sha256:a7c6002203fe2c5a1b5cbb141bb85060cbff88c2d78eccbc72d97eb7022c43e4"},
+    {file = "pydantic-1.8.2-cp36-cp36m-manylinux2014_i686.whl", hash = "sha256:589eb6cd6361e8ac341db97602eb7f354551482368a37f4fd086c0733548308e"},
+    {file = "pydantic-1.8.2-cp36-cp36m-manylinux2014_x86_64.whl", hash = "sha256:10e5622224245941efc193ad1d159887872776df7a8fd592ed746aa25d071840"},
+    {file = "pydantic-1.8.2-cp36-cp36m-win_amd64.whl", hash = "sha256:99a9fc39470010c45c161a1dc584997f1feb13f689ecf645f59bb4ba623e586b"},
+    {file = "pydantic-1.8.2-cp37-cp37m-macosx_10_9_x86_64.whl", hash = "sha256:a83db7205f60c6a86f2c44a61791d993dff4b73135df1973ecd9eed5ea0bda20"},
+    {file = "pydantic-1.8.2-cp37-cp37m-manylinux1_i686.whl", hash = "sha256:41b542c0b3c42dc17da70554bc6f38cbc30d7066d2c2815a94499b5684582ecb"},
+    {file = "pydantic-1.8.2-cp37-cp37m-manylinux2014_i686.whl", hash = "sha256:ea5cb40a3b23b3265f6325727ddfc45141b08ed665458be8c6285e7b85bd73a1"},
+    {file = "pydantic-1.8.2-cp37-cp37m-manylinux2014_x86_64.whl", hash = "sha256:18b5ea242dd3e62dbf89b2b0ec9ba6c7b5abaf6af85b95a97b00279f65845a23"},
+    {file = "pydantic-1.8.2-cp37-cp37m-win_amd64.whl", hash = "sha256:234a6c19f1c14e25e362cb05c68afb7f183eb931dd3cd4605eafff055ebbf287"},
+    {file = "pydantic-1.8.2-cp38-cp38-macosx_10_9_x86_64.whl", hash = "sha256:021ea0e4133e8c824775a0cfe098677acf6fa5a3cbf9206a376eed3fc09302cd"},
+    {file = "pydantic-1.8.2-cp38-cp38-manylinux1_i686.whl", hash = "sha256:e710876437bc07bd414ff453ac8ec63d219e7690128d925c6e82889d674bb505"},
+    {file = "pydantic-1.8.2-cp38-cp38-manylinux2014_i686.whl", hash = "sha256:ac8eed4ca3bd3aadc58a13c2aa93cd8a884bcf21cb019f8cfecaae3b6ce3746e"},
+    {file = "pydantic-1.8.2-cp38-cp38-manylinux2014_x86_64.whl", hash = "sha256:4a03cbbe743e9c7247ceae6f0d8898f7a64bb65800a45cbdc52d65e370570820"},
+    {file = "pydantic-1.8.2-cp38-cp38-win_amd64.whl", hash = "sha256:8621559dcf5afacf0069ed194278f35c255dc1a1385c28b32dd6c110fd6531b3"},
+    {file = "pydantic-1.8.2-cp39-cp39-macosx_10_9_x86_64.whl", hash = "sha256:8b223557f9510cf0bfd8b01316bf6dd281cf41826607eada99662f5e4963f316"},
+    {file = "pydantic-1.8.2-cp39-cp39-manylinux1_i686.whl", hash = "sha256:244ad78eeb388a43b0c927e74d3af78008e944074b7d0f4f696ddd5b2af43c62"},
+    {file = "pydantic-1.8.2-cp39-cp39-manylinux2014_i686.whl", hash = "sha256:05ef5246a7ffd2ce12a619cbb29f3307b7c4509307b1b49f456657b43529dc6f"},
+    {file = "pydantic-1.8.2-cp39-cp39-manylinux2014_x86_64.whl", hash = "sha256:54cd5121383f4a461ff7644c7ca20c0419d58052db70d8791eacbbe31528916b"},
+    {file = "pydantic-1.8.2-cp39-cp39-win_amd64.whl", hash = "sha256:4be75bebf676a5f0f87937c6ddb061fa39cbea067240d98e298508c1bda6f3f3"},
+    {file = "pydantic-1.8.2-py3-none-any.whl", hash = "sha256:fec866a0b59f372b7e776f2d7308511784dace622e0992a0b59ea3ccee0ae833"},
+    {file = "pydantic-1.8.2.tar.gz", hash = "sha256:26464e57ccaafe72b7ad156fdaa4e9b9ef051f69e175dbbb463283000c05ab7b"},
+]
+pyparsing = [
+    {file = "pyparsing-2.4.7-py2.py3-none-any.whl", hash = "sha256:ef9d7589ef3c200abe66653d3f1ab1033c3c419ae9b9bdb1240a85b024efc88b"},
+    {file = "pyparsing-2.4.7.tar.gz", hash = "sha256:c203ec8783bf771a155b207279b9bccb8dea02d8f0c9e5f8ead507bc3246ecc1"},
+]
+pytest = [
+    {file = "pytest-6.2.4-py3-none-any.whl", hash = "sha256:91ef2131a9bd6be8f76f1f08eac5c5317221d6ad1e143ae03894b862e8976890"},
+    {file = "pytest-6.2.4.tar.gz", hash = "sha256:50bcad0a0b9c5a72c8e4e7c9855a3ad496ca6a881a3641b4260605450772c54b"},
+]
+toml = [
+    {file = "toml-0.10.2-py2.py3-none-any.whl", hash = "sha256:806143ae5bfb6a3c6e736a764057db0e6a0e05e338b5630894a5f779cabb4f9b"},
+    {file = "toml-0.10.2.tar.gz", hash = "sha256:b3bda1d108d5dd99f4a20d24d9c348e91c4db7ab1b749200bded2f839ccbe68f"},
+]
+typing-extensions = [
+    {file = "typing_extensions-3.10.0.0-py2-none-any.whl", hash = "sha256:0ac0f89795dd19de6b97debb0c6af1c70987fd80a2d62d1958f7e56fcc31b497"},
+    {file = "typing_extensions-3.10.0.0-py3-none-any.whl", hash = "sha256:779383f6086d90c99ae41cf0ff39aac8a7937a9283ce0a414e5dd782f4c94a84"},
+    {file = "typing_extensions-3.10.0.0.tar.gz", hash = "sha256:50b6f157849174217d0656f99dc82fe932884fb250826c18350e159ec6cdf342"},
+]
diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 0000000..f8a4c21
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,16 @@
+[tool.poetry]
+name = "python-ddd"
+version = "0.1.0"
+description = ""
+authors = ["Przemysław Górecki <przemyslaw.gorecki@gmail.com>"]
+
+[tool.poetry.dependencies]
+python = "^3.9"
+pytest = "^6.2.4"
+pydantic = "^1.8.2"
+
+[tool.poetry.dev-dependencies]
+
+[build-system]
+requires = ["poetry-core>=1.0.0"]
+build-backend = "poetry.core.masonry.api"
diff --git a/src/conftest.py b/src/conftest.py
new file mode 100644
index 0000000..e69de29
diff --git a/src/modules/README.md b/src/modules/README.md
new file mode 100644
index 0000000..9d6462b
--- /dev/null
+++ b/src/modules/README.md
@@ -0,0 +1 @@
+This directory contains all modules related to bounded contexts.
\ No newline at end of file
diff --git a/src/modules/listing/domain/entities.py b/src/modules/listing/domain/entities.py
new file mode 100644
index 0000000..54ee642
--- /dev/null
+++ b/src/modules/listing/domain/entities.py
@@ -0,0 +1,5 @@
+from seedwork.domain.entities import Entity
+
+
+class AuctionItem(Entity):
+    pass
\ No newline at end of file
diff --git a/src/modules/listing/domain/events.py b/src/modules/listing/domain/events.py
new file mode 100644
index 0000000..368b67d
--- /dev/null
+++ b/src/modules/listing/domain/events.py
@@ -0,0 +1,7 @@
+from seedwork.domain.events import DomainEvent
+
+
+class DraftCreatedEvent(DomainEvent):
+    pass
+
+
diff --git a/src/modules/listing/domain/rules.py b/src/modules/listing/domain/rules.py
new file mode 100644
index 0000000..59cad8b
--- /dev/null
+++ b/src/modules/listing/domain/rules.py
@@ -0,0 +1,9 @@
+from seedwork.domain.rules import BusinessRule
+from seedwork.domain.value_objects import Currency
+
+class AuctionItemPriceMustBeGreaterThanZero(BusinessRule):
+    message = "Price must be greater that zero"
+    price: Currency
+
+    def is_broken(self) -> bool:
+        return self.price <= 0
\ No newline at end of file
diff --git a/src/modules/listing/tests/domain/test_rules.py b/src/modules/listing/tests/domain/test_rules.py
new file mode 100644
index 0000000..8b1f6b1
--- /dev/null
+++ b/src/modules/listing/tests/domain/test_rules.py
@@ -0,0 +1,11 @@
+from modules.listing.domain.rules import AuctionItemPriceMustBeGreaterThanZero
+
+
+def test_AuctionItemPriceMustBeGreaterThanZero_rule():
+    rule = AuctionItemPriceMustBeGreaterThanZero(price=1)
+    assert not rule.is_broken()
+
+
+def test_AuctionItemPriceMustBeGreaterThanZero_rule_is_broken():
+    rule = AuctionItemPriceMustBeGreaterThanZero(price=0)
+    assert rule.is_broken()
diff --git a/src/pytest.ini b/src/pytest.ini
new file mode 100644
index 0000000..e69de29
diff --git a/src/seedwork/README.md b/src/seedwork/README.md
new file mode 100644
index 0000000..39df327
--- /dev/null
+++ b/src/seedwork/README.md
@@ -0,0 +1,6 @@
+A **framework** is supposed to be a part-baked application that you extend in controlled ways to provide what you need. A **seedwork** is some minimal functionality that you modify however you like to get what you need. Of course this means that there's no way for you to get common updates to the seedwork, once you grow it you own it. 
+
+
+References:
+
+- https://martinfowler.com/bliki/Seedwork.html
\ No newline at end of file
diff --git a/src/seedwork/application/command.py b/src/seedwork/application/command.py
new file mode 100644
index 0000000..5295335
--- /dev/null
+++ b/src/seedwork/application/command.py
@@ -0,0 +1,5 @@
+from pydantic import BaseModel
+
+
+class Command(BaseModel):
+    pass
\ No newline at end of file
diff --git a/src/seedwork/domain/entities.py b/src/seedwork/domain/entities.py
new file mode 100644
index 0000000..c39e2ed
--- /dev/null
+++ b/src/seedwork/domain/entities.py
@@ -0,0 +1,2 @@
+class Entity:
+    pass
\ No newline at end of file
diff --git a/src/seedwork/domain/events.py b/src/seedwork/domain/events.py
new file mode 100644
index 0000000..33e894c
--- /dev/null
+++ b/src/seedwork/domain/events.py
@@ -0,0 +1,5 @@
+from pydantic import BaseModel
+
+
+class DomainEvent(BaseModel):
+    pass
\ No newline at end of file
diff --git a/src/seedwork/domain/exceptions.py b/src/seedwork/domain/exceptions.py
new file mode 100644
index 0000000..a5a6453
--- /dev/null
+++ b/src/seedwork/domain/exceptions.py
@@ -0,0 +1,6 @@
+class DomainException(Exception):
+    pass
+
+
+class BusinessRuleValidationException(DomainException):
+    pass
\ No newline at end of file
diff --git a/src/seedwork/domain/rules.py b/src/seedwork/domain/rules.py
new file mode 100644
index 0000000..eaa0ba3
--- /dev/null
+++ b/src/seedwork/domain/rules.py
@@ -0,0 +1,11 @@
+from pydantic import BaseModel
+
+
+class BusinessRule(BaseModel):
+    message: str = "This is an error message for broken business rule"
+
+    def get_message(self) -> str:
+        return self.message
+
+    def is_broken(self) -> bool:
+        pass
\ No newline at end of file
diff --git a/src/seedwork/domain/value_objects.py b/src/seedwork/domain/value_objects.py
new file mode 100644
index 0000000..1614333
--- /dev/null
+++ b/src/seedwork/domain/value_objects.py
@@ -0,0 +1,2 @@
+class Currency(int):
+    pass
\ No newline at end of file
diff --git a/src/seedwork/infrastructure/repository.py b/src/seedwork/infrastructure/repository.py
new file mode 100644
index 0000000..c9d3b1a
--- /dev/null
+++ b/src/seedwork/infrastructure/repository.py
@@ -0,0 +1,2 @@
+class Repository:
+    pass
\ No newline at end of file