diff --git a/.editorconfig b/.editorconfig
new file mode 100644
index 0000000..2fc89cc
--- /dev/null
+++ b/.editorconfig
@@ -0,0 +1,20 @@
+# .editorconfig
+
+# Check http://editorconfig.org for more information
+# top-most .editorconfig file
+root = true
+# Unix-style newlines with a newline ending every file
+[*]
+end_of_line = lf
+insert_final_newline = true
+charset = utf-8
+trim_trailing_whitespace = true
+indent_style = space
+[*.py]
+indent_size = 4
+[Makefile]
+indent_style = tab
+[*.md]
+trim_trailing_whitespace = false
+[*.{yaml,yml}]
+indent_size = 2
\ No newline at end of file
diff --git a/.flake8 b/.flake8
new file mode 100644
index 0000000..09a7db6
--- /dev/null
+++ b/.flake8
@@ -0,0 +1,4 @@
+# .flake8
+[flake8]
+max-line-length = 88
+extend-ignore = E203
diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
new file mode 100644
index 0000000..8f044f5
--- /dev/null
+++ b/.github/workflows/lint.yml
@@ -0,0 +1,39 @@
+---
+name: Linting
+
+on:
+  pull_request:
+    branches:
+      - main
+      - develop
+  push:
+    branches:
+      - main
+      - develop
+
+jobs:
+  Linting:
+    runs-on: ubuntu-latest
+    steps:
+      # check-out repo
+      - name: Checkout repository
+        uses: actions/checkout@v3
+        with:
+          ref: ${{ github.head_ref }}
+      # install poetry
+      - name: Install poetry
+        run: pipx install poetry==1.2.0
+      # set-up python with cache
+      - name: Setup Python 3.10
+        uses: actions/setup-python@v4
+        with:
+          python-version: '3.10'
+          cache: 'poetry'
+      # install requirements (including dev dependencies)
+      - name: Install requirements
+        run: poetry install --with lint
+      # run linters
+      - name: Run linters
+        run: |
+          set -o pipefail
+          poetry run make lint
diff --git a/.github/workflows/build_release.yml b/.github/workflows/test_build_dev.old
similarity index 97%
rename from .github/workflows/build_release.yml
rename to .github/workflows/test_build_dev.old
index 57cbd00..e56583f 100644
--- a/.github/workflows/build_release.yml
+++ b/.github/workflows/test_build_dev.old
@@ -1,10 +1,13 @@
-name: "Test, Build, Publish: Main"
+name: "Test, Build, Publish: Dev"
 
 on: 
   push:
     branches:
-      - main
+      - develop
   pull_request:
+    branches:
+      - develop
+
 
 jobs:
   build:
diff --git a/.github/workflows/test_build_main.old b/.github/workflows/test_build_main.old
new file mode 100644
index 0000000..167cd29
--- /dev/null
+++ b/.github/workflows/test_build_main.old
@@ -0,0 +1,100 @@
+name: "Test, Build, Publish: Main"
+
+on: 
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: ["3.10", "3.9", "3.8"]
+    steps:
+    - uses: actions/checkout@v3.3.0
+    
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v4.5.0
+      with:
+        python-version: ${{ matrix.python-version }}
+    
+    - name: Install dependencies
+      run: |
+        python${{ matrix.python-version }} -m venv env
+        source env/bin/activate
+        python -m pip install --upgrade pip setuptools
+        python -m pip install ".[dev]"
+    
+    - name: "Static analysis: pylint"
+      run: |
+        source env/bin/activate
+        pylint -d C0301 $(git ls-files '*.py')
+
+    - name: "Static analysis: mypy"
+      run: |
+        source env/bin/activate
+        python -m mypy src/which_plates/*.py
+
+    - name: "Static analysis: flake8"
+      run: |
+        source env/bin/activate
+        flake8 --statistics --count --max-line-length=130 --max-complexity 8 src/which_plates/*.py
+
+    - name: "Static analysis: safety"
+      run: |
+        source env/bin/activate
+        safety check
+
+    - name: "Test: pytest"
+      run: |
+        source env/bin/activate
+        pytest --cov which_plates --junitxml=pytest.xml --cov-report=term-missing:skip-covered src/which_plates/tests/ | tee pytest-coverage.txt
+    
+    - name: Pytest coverage comment
+      uses: MishaKav/pytest-coverage-comment@main
+      with:
+        pytest-coverage-path: ./pytest-coverage.txt
+        junitxml-path: ./pytest.xml
+
+  release:
+      needs: build
+      if: github.event_name == 'push' && github.ref == 'refs/heads/main'
+      runs-on: ubuntu-latest
+      strategy:
+        matrix:
+          python-version: ["3.10"]
+      steps:
+        - uses: actions/checkout@v3
+          with:
+            fetch-depth: 0
+
+        - name: Install dependencies
+          run: |
+            python${{ matrix.python-version }} -m venv env
+            source env/bin/activate
+            python -m pip install --upgrade pip setuptools
+            python -m pip install ".[dev]"
+
+        - name: Build package
+          run: |
+            source env/bin/activate
+            python -m build
+
+        - name: Archive package
+          uses: actions/upload-artifact@v3
+          with:
+            name: which_plates
+            path: dist/
+
+        - name: Publish distribution to PyPI
+          uses: pypa/gh-action-pypi-publish@v1.6.4
+          if: github.repository == 'iandday/whichPlates' && matrix.python-version == '3.10' && github.event_name == 'push')
+          with:
+            password: ${{ secrets.PYPI_API_TOKEN }}
+  
+  
\ No newline at end of file
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..67b2936
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,24 @@
+format-black:
+	@black .
+
+format-isort:
+	@isort .
+
+lint-black:
+	@black . --check
+
+lint-isort:
+	@isort . --check
+
+lint-flake8:
+	@flake8 .
+
+lint-mypy:
+	@mypy ./src
+
+lint-mypy-report:
+	@mypy ./src --html-report ./mypy_html
+
+format: format-black format-isort
+
+lint: lint-black lint-isort lint-flake8 lint-mypy
diff --git a/poetry.lock b/poetry.lock
new file mode 100644
index 0000000..3b9a1be
--- /dev/null
+++ b/poetry.lock
@@ -0,0 +1,369 @@
+# This file is automatically @generated by Poetry 1.4.2 and should not be changed by hand.
+
+[[package]]
+name = "black"
+version = "23.3.0"
+description = "The uncompromising code formatter."
+category = "dev"
+optional = false
+python-versions = ">=3.7"
+files = [
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+mypy-extensions = ">=0.4.3"
+packaging = ">=22.0"
+pathspec = ">=0.9.0"
+platformdirs = ">=2"
+tomli = {version = ">=1.1.0", markers = "python_version < \"3.11\""}
+
+[package.extras]
+colorama = ["colorama (>=0.4.3)"]
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+jupyter = ["ipython (>=7.8.0)", "tokenize-rt (>=3.2.0)"]
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+[[package]]
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+category = "dev"
+optional = false
+python-versions = ">=3.7"
+files = [
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+
+[[package]]
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+category = "dev"
+optional = false
+python-versions = ">=3.8.1"
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+pycodestyle = ">=2.10.0,<2.11.0"
+pyflakes = ">=3.0.0,<3.1.0"
+
+[[package]]
+name = "isort"
+version = "5.12.0"
+description = "A Python utility / library to sort Python imports."
+category = "dev"
+optional = false
+python-versions = ">=3.8.0"
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+plugins = ["setuptools"]
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+
+[[package]]
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+category = "main"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, != 3.4.*"
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+    {file = "packaging-23.0.tar.gz", hash = "sha256:b6ad297f8907de0fa2fe1ccbd26fdaf387f5f47c7275fedf8cce89f99446cf97"},
+]
+
+[[package]]
+name = "pathspec"
+version = "0.11.1"
+description = "Utility library for gitignore style pattern matching of file paths."
+category = "dev"
+optional = false
+python-versions = ">=3.7"
+files = [
+    {file = "pathspec-0.11.1-py3-none-any.whl", hash = "sha256:d8af70af76652554bd134c22b3e8a1cc46ed7d91edcdd721ef1a0c51a84a5293"},
+    {file = "pathspec-0.11.1.tar.gz", hash = "sha256:2798de800fa92780e33acca925945e9a19a133b715067cf165b8866c15a31687"},
+]
+
+[[package]]
+name = "platformdirs"
+version = "3.2.0"
+description = "A small Python package for determining appropriate platform-specific dirs, e.g. a \"user data dir\"."
+category = "dev"
+optional = false
+python-versions = ">=3.7"
+files = [
+    {file = "platformdirs-3.2.0-py3-none-any.whl", hash = "sha256:ebe11c0d7a805086e99506aa331612429a72ca7cd52a1f0d277dc4adc20cb10e"},
+    {file = "platformdirs-3.2.0.tar.gz", hash = "sha256:d5b638ca397f25f979350ff789db335903d7ea010ab28903f57b27e1b16c2b08"},
+]
+
+[package.extras]
+docs = ["furo (>=2022.12.7)", "proselint (>=0.13)", "sphinx (>=6.1.3)", "sphinx-autodoc-typehints (>=1.22,!=1.23.4)"]
+test = ["appdirs (==1.4.4)", "covdefaults (>=2.3)", "pytest (>=7.2.2)", "pytest-cov (>=4)", "pytest-mock (>=3.10)"]
+
+[[package]]
+name = "pycodestyle"
+version = "2.10.0"
+description = "Python style guide checker"
+category = "dev"
+optional = false
+python-versions = ">=3.6"
+files = [
+    {file = "pycodestyle-2.10.0-py2.py3-none-any.whl", hash = "sha256:8a4eaf0d0495c7395bdab3589ac2db602797d76207242c17d470186815706610"},
+    {file = "pycodestyle-2.10.0.tar.gz", hash = "sha256:347187bdb476329d98f695c213d7295a846d1152ff4fe9bacb8a9590b8ee7053"},
+]
+
+[[package]]
+name = "pyflakes"
+version = "3.0.1"
+description = "passive checker of Python programs"
+category = "dev"
+optional = false
+python-versions = ">=3.6"
+files = [
+    {file = "pyflakes-3.0.1-py2.py3-none-any.whl", hash = "sha256:ec55bf7fe21fff7f1ad2f7da62363d749e2a470500eab1b555334b67aa1ef8cf"},
+    {file = "pyflakes-3.0.1.tar.gz", hash = "sha256:ec8b276a6b60bd80defed25add7e439881c19e64850afd9b346283d4165fd0fd"},
+]
+
+[[package]]
+name = "tomli"
+version = "2.0.1"
+description = "A lil' TOML parser"
+category = "dev"
+optional = false
+python-versions = ">=3.7"
+files = [
+    {file = "tomli-2.0.1-py3-none-any.whl", hash = "sha256:939de3e7a6161af0c887ef91b7d41a53e7c5a1ca976325f429cb46ea9bc30ecc"},
+    {file = "tomli-2.0.1.tar.gz", hash = "sha256:de526c12914f0c550d15924c62d72abc48d6fe7364aa87328337a31007fe8a4f"},
+]
+
+[[package]]
+name = "typing-extensions"
+version = "4.5.0"
+description = "Backported and Experimental Type Hints for Python 3.7+"
+category = "dev"
+optional = false
+python-versions = ">=3.7"
+files = [
+    {file = "typing_extensions-4.5.0-py3-none-any.whl", hash = "sha256:fb33085c39dd998ac16d1431ebc293a8b3eedd00fd4a32de0ff79002c19511b4"},
+    {file = "typing_extensions-4.5.0.tar.gz", hash = "sha256:5cb5f4a79139d699607b3ef622a1dedafa84e115ab0024e0d9c044a9479ca7cb"},
+]
+
+[metadata]
+lock-version = "2.0"
+python-versions = "^3.10"
+content-hash = "aa27745952c781981691ecc60303b6eb1dbfdb43cbd020a4835375b00ca1a456"
diff --git a/pyproject.toml b/pyproject.toml
index 8878fec..a331347 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,53 @@
+[tool.poetry]
+name = "which_plates"
+version = "0.1.0"
+description = ""
+authors = ["Ian Day <ian@ianday.me>"]
+readme = "README.md"
+packages = [{include = "which_plates"}]
+homepage = "https://github.com/iandday/whichPlates"
+repository = "https://github.com/iandday/whichPlates"
+license = "GNUv2"
+
+[tool.poetry.dependencies]
+python = "^3.10"
+lxml = "^4.9.2"
+
+
+[tool.poetry.group.lint.dependencies]
+isort = "^5.12.0"
+black = "^23.3.0"
+flake8 = "^6.0.0"
+mypy = "^1.2.0"
+
 [build-system]
-requires = [
-    "setuptools>=66",
-    "wheel"
-]
-build-backend = "setuptools.build_meta"
\ No newline at end of file
+requires = ["poetry-core"]
+build-backend = "poetry.core.masonry.api"
+
+[tool.isor]
+profile = "black"
+
+[tool.mypy]
+# 3rd party import
+ignore_missing_imports = true
+# dynamic typing
+disallow_any_unimported = true
+disallow_any_expr = false
+disallow_any_decorated = false
+disallow_any_explicit = true
+disallow_any_generics = false
+disallow_subclassing_any = true
+# platform
+python_version = "3.10"
+# untyped
+disallow_untyped_calls = true
+disallow_untyped_defs = true
+disallow_incomplete_defs = true
+disallow_untyped_decorators = true
+# None and Optional
+no_implicit_optional = true
+# Warnings
+warn_return_any = false
+warn_unreachable = true
+# Misc
+pretty = true
diff --git a/src/which_plates/__init__.py b/src/which_plates/__init__.py
index eeb1431..1bb6ec6 100644
--- a/src/which_plates/__init__.py
+++ b/src/which_plates/__init__.py
@@ -1,7 +1,11 @@
 """ initialize """
 
-from .functions import round_num, calc_plates
+from .functions import calc_plates, round_num
 from .main import main
-from .version import __version__  # noqa: F401
 
-__all__ = ['round_num', 'calc_plates', 'main', ]
+__all__ = [
+    "round_num",
+    "calc_plates",
+    "main",
+]
+__version__ = "0.1.0"
diff --git a/src/which_plates/main.py b/src/which_plates/main.py
index 6dafa19..4aab4b0 100644
--- a/src/which_plates/main.py
+++ b/src/which_plates/main.py
@@ -1,12 +1,14 @@
 """ main function for which_plates"""
 
 import sys
+
 from . import functions
 
 
-def main_function(bar_weight, rep_max, available_plates, percentages):
-    """main function
-    """
+def main_function(
+    bar_weight: int, rep_max: int, available_plates: list, percentages: list
+) -> int:
+    """main function"""
 
     set_count = 1
     used_plates = {}
@@ -15,16 +17,18 @@ def main_function(bar_weight, rep_max, available_plates, percentages):
         used_plates[plates] = 0
 
     for percent in percentages:
-
         # calculate plate weight needed for current percentage
         plate_weight = functions.round_num((rep_max * percent) - bar_weight)
 
         if plate_weight <= 0:
-            print('    Computed weight less than bar weight, try again')
+            print("    Computed weight less than bar weight, try again")
         else:
             total_weight = round(plate_weight + bar_weight)
             weight = round(plate_weight)
-            print(F"Set {set_count} @ {percent * 100}%: {total_weight}lbs, {weight}lbs in plates")  # noqa: E501
+            perc = percent * 100
+            print(
+                f"Set {set_count} @ {perc}%: {total_weight}lbs, {weight}lbs in plates"
+            )  # noqa: E501
 
         plates = functions.calc_plates(plate_weight, available_plates)
         for p_weight, p_count in plates.items():
@@ -35,23 +39,22 @@ def main_function(bar_weight, rep_max, available_plates, percentages):
     # Print summary
     for p_weight, p_count in used_plates.items():
         if p_count:
-            print(F'     {p_weight}: {p_count}')
+            print(f"     {p_weight}: {p_count}")
 
     return 0
 
 
-def main():
+def main() -> int:
     """function with no inputs to allow use as a console script"""
 
     available_plates = [45, 35, 25, 15, 10, 5, 2.5]
     bar_weight = int(input("Bar Weight:"))
     rep_max = int(input("One rep max:"))
     raw_list = input("Percentages for each set, space separated: ").split()
-    percentages = [float(n)/100 for n in raw_list if n.isdigit()]
+    percentages = [float(n) / 100 for n in raw_list if n.isdigit()]
 
     sys.exit(main_function(bar_weight, rep_max, available_plates, percentages))
 
 
 if __name__ == "__main__":
-
     main()
diff --git a/src/which_plates/tests/test_functions.py b/src/which_plates/tests/test_functions.py
index 6ec3c8b..182c9a8 100644
--- a/src/which_plates/tests/test_functions.py
+++ b/src/which_plates/tests/test_functions.py
@@ -2,34 +2,32 @@
 
 import pytest
 
-from which_plates.functions import round_num, calc_plates
+from which_plates.functions import calc_plates, round_num
 
 
-
-
-def test_round_num_float():
-    '''Float input'''
+def test_round_num_float() -> None:
+    """Float input"""
     result = round_num(16.5)
     assert result == 20
 
 
-def test_round_num_int():
-    '''Integer input'''
+def test_round_num_int() -> None:
+    """Integer input"""
     result = round_num(16)
     assert result == 20
 
 
-def test_round_num_string():
-    '''String input'''
+def test_round_num_string() -> None:
+    """String input"""
 
     with pytest.raises(SystemExit) as pytest_wrapped_e:
-        round_num('g')
+        round_num("g")  # type: ignore[arg-type]
     assert pytest_wrapped_e.type == SystemExit
     assert pytest_wrapped_e.value.code == 1
 
 
-def test_calc_plates_int_and_list():
-    '''expected input'''
+def test_calc_plates_int_and_list() -> None:
+    """expected input"""
     result = calc_plates(200, [45, 35, 25, 15, 10, 5, 2.5])
     assert isinstance(result, dict)
-    assert result == { 45: 4, 10: 2 }
+    assert result == {45: 4, 10: 2}
diff --git a/src/which_plates/tests/test_main.py b/src/which_plates/tests/test_main.py
index 77a8ff9..032fd1b 100644
--- a/src/which_plates/tests/test_main.py
+++ b/src/which_plates/tests/test_main.py
@@ -1,31 +1,31 @@
-'''test main.py'''
+"""test main.py"""
 
 import pytest
 
-from which_plates.main import  main, main_function
+from which_plates.main import main, main_function
 
 
-def test_main(monkeypatch):
-    ''' test main'''
+def test_main(monkeypatch) -> None:  # type: ignore[no-untyped-def]
+    """test main"""
 
     # fake inputs
     bar_weight = 45
     total_weight = 245
-    percentages = '50 75 95'
+    percentages = "50 75 95"
     answers = iter([bar_weight, total_weight, percentages])
-    monkeypatch.setattr('builtins.input', lambda name: next(answers))
+    monkeypatch.setattr("builtins.input", lambda name: next(answers))
 
     with pytest.raises(SystemExit) as excinfo:
         main()
-    assert excinfo.value.code ==0
+    assert excinfo.value.code == 0
 
 
-def test_main_function():
-    '''test main_function'''
+def test_main_function() -> None:
+    """test main_function"""
 
     bar_weight = 45
     total_weight = 245
-    percentages = [.50, .75, .95]
+    percentages = [0.50, 0.75, 0.95]
     available_plates = [45, 35, 25, 15, 10, 5, 2.5]
 
     result = main_function(bar_weight, total_weight, available_plates, percentages)
diff --git a/src/which_plates/version.py b/src/which_plates/version.py
deleted file mode 100644
index ec9ba16..0000000
--- a/src/which_plates/version.py
+++ /dev/null
@@ -1,2 +0,0 @@
-"""version"""
-__version__ = '0.0.2'