diff --git a/.pylintrc b/.pylintrc
index 9e6d02f..15373de 100644
--- a/.pylintrc
+++ b/.pylintrc
@@ -16,7 +16,7 @@ persistent=yes
 
 # List of plugins (as comma separated values of python modules names) to load,
 # usually to register additional checkers.
-load-plugins=
+load-plugins=pylint.extensions.docparams
 
 # Use multiple processes to speed up Pylint.
 jobs=1
diff --git a/.travis.yml b/.travis.yml
index 94638e2..3112564 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,46 +1,128 @@
 sudo: false
 language: python
 os: linux
-python:
-- 3.5
-- 3.6
-- &mainstream_python 3.7-dev
-- &pypy pypy3.5
 install:
 - &upgrade_python_toolset pip install --upgrade pip setuptools wheel
-- pip install tox-travis
-- pip install coveralls
-script: tox
+- &install_test_deps pip install --upgrade pytest pytest-sugar
+- &install_deps pip install -r CI_REQUIREMENTS.txt
+- pip install --upgrade pytest-cov coveralls
+
+_helpers:
+- &install_cython pip install --upgrade Cython
+- &build_package python setup.py bdist_wheel
+- &install_built pip install logwrap --no-index -f dist
+- &test_no_cov  py.test -vv test
+- &test_cythonized
+  install:
+  - *upgrade_python_toolset
+  - *install_test_deps
+  - *install_deps
+  - *install_cython
+  script:
+  - *build_package
+  - *install_built
+  - *test_no_cov
+  after_success: skip
+
+script:
+- pip install -e .
+- py.test -vv --cov-config .coveragerc --cov-report= --cov=logwrap test
+- coverage report -m --fail-under 87
 after_success:
 - coveralls
 
 jobs:
   fast_finish: true
   include:
+  - stage: test
+    name: "Python 3.5"
+    python: 3.5
+  - stage: test
+    name: "Python 3.6"
+    python: 3.6
+  - stage: test
+    name: "Python 3.7"
+    python: 3.7
+    dist: xenial
+    sudo: true
+  - stage: test
+    name: "PyPy3"
+    python: pypy3.5
+
+  - stage: Static analisys
+    name: "PyLint"
+    python: 3.6
+    services: []
+    install:
+    - *upgrade_python_toolset
+    - *install_deps
+    - pip install --upgrade "pylint >= 2.0"
+    script:
+    - pylint logwrap
+    after_success: skip
   - stage: Static analisys
+    name: "Bandit"
     python: 3.6
     services: []
     install:
     - *upgrade_python_toolset
-    - pip install tox
+    - pip install --upgrade bandit
     script:
-    - tox -e pylint,bandit,mypy
+    - bandit -r logwrap
+    after_success: skip
+  - stage: Static analisys
+    name: "MyPy"
+    python: 3.7
+    dist: xenial
+    sudo: true
+    services: []
+    install:
+    - *upgrade_python_toolset
+    - *install_deps
+    - pip install --upgrade "mypy >= 0.620"
+    script:
+    - mypy --strict logwrap
     after_success: skip
 
+  - stage: Test cythonized
+    name: "Python 3.5"
+    python: 3.5
+    <<: *test_cythonized
+  - stage: Test cythonized
+    name: "Python 3.6"
+    python: 3.6
+    <<: *test_cythonized
+  - stage: Test cythonized
+    name: "Python 3.7"
+    python: 3.7
+    dist: xenial
+    sudo: true
+    <<: *test_cythonized
+
   - stage: Code style check
-    python: *mainstream_python
-    services: []
+    name: "PEP8"
+    python: 3.6
+    install:
+    - *upgrade_python_toolset
+    - pip install --upgrade flake8
+    script:
+    - flake8
+    after_success: skip
+  - stage: Code style check
+    name: "PEP257"
+    python: 3.6
     install:
     - *upgrade_python_toolset
-    - pip install tox
+    - pip install --upgrade pydocstyle
     script:
-    - tox -e pep8,pep257
+    - pydocstyle logwrap
     after_success: skip
 
   - stage: deploy
     # This prevents job from appearing in test plan unless commit is tagged:
     if: tag IS present
-    python: *pypy
+    # Run on pypy to build not cythonized wheel
+    python: pypy3.5
     services:
     - docker
     install:
@@ -49,7 +131,7 @@ jobs:
     - ./tools/run_docker.sh "logwrap"
     before_deploy:
     - pip install -r build_requirements.txt
-    - python setup.py bdist_wheel
+    - *build_package
     deploy:
     - provider: pypi
       # `skip_cleanup: true` is required to preserve binary wheels, built
diff --git a/logwrap/_log_wrap.py b/logwrap/_log_wrap.py
index 9c13337..2a151a4 100644
--- a/logwrap/_log_wrap.py
+++ b/logwrap/_log_wrap.py
@@ -165,6 +165,10 @@ def bind_args_kwargs(
 
     :param sig: source signature
     :type sig: inspect.Signature
+    :param args: not keyworded arguments
+    :type args: tuple
+    :param kwargs: keyworded arguments
+    :type kwargs: dict
     :return: Iterator for bound parameters with all information about it
     :rtype: typing.Iterator[BoundParameter]
 
@@ -366,7 +370,9 @@ def log_call_args(self) -> bool:
     def log_call_args(self, val: bool) -> None:
         """Flag: log call arguments before call.
 
+        :param val: Enable flag
         :type val: bool
+        :raises TypeError: Value is not bool
         """
         if not isinstance(val, bool):
             raise TypeError(
@@ -389,7 +395,9 @@ def log_call_args_on_exc(self) -> bool:
     def log_call_args_on_exc(self, val: bool) -> None:
         """Flag: log call arguments on exception.
 
+        :param val: Enable flag
         :type val: bool
+        :raises TypeError: Value is not bool
         """
         if not isinstance(val, bool):
             raise TypeError(
@@ -412,7 +420,9 @@ def log_result_obj(self) -> bool:
     def log_result_obj(self, val: bool) -> None:
         """Flag: log result object.
 
+        :param val: Enable flag
         :type val: bool
+        :raises TypeError: Value is not bool
         """
         if not isinstance(val, bool):
             raise TypeError(
@@ -425,7 +435,7 @@ def log_result_obj(self, val: bool) -> None:
 
     @property
     def _logger(self) -> logging.Logger:
-        """logger instance.
+        """Logger instance.
 
         :rtype: logging.Logger
         """
@@ -506,9 +516,13 @@ def _get_func_args_repr(
     ) -> str:
         """Internal helper for reducing complexity of decorator code.
 
+        :param sig: function signature
         :type sig: inspect.Signature
+        :param args: not keyworded arguments
         :type args: tuple
+        :param kwargs: keyworded arguments
         :type kwargs: dict
+        :return: repr over function arguments
         :rtype: str
 
         .. versionchanged:: 3.3.0 Use pre- and post- processing of params during execution
diff --git a/logwrap/_repr_utils.py b/logwrap/_repr_utils.py
index ca66a3d..828f6cf 100644
--- a/logwrap/_repr_utils.py
+++ b/logwrap/_repr_utils.py
@@ -121,7 +121,9 @@ def _prepare_repr(
 ) -> typing.Iterator[ReprParameter]:
     """Get arguments lists with defaults.
 
+    :param func: Callable object to process
     :type func: typing.Union[types.FunctionType, types.MethodType]
+    :return: repr of callable parameter from signature
     :rtype: typing.Iterator[ReprParameter]
     """
     isfunction = isinstance(func, types.FunctionType)
@@ -192,6 +194,7 @@ def next_indent(self, indent: int, multiplier: int = 1) -> int:
         :type indent: int
         :param multiplier: step multiplier
         :type multiplier: int
+        :return: next indentation value
         :rtype: int
         """
         return indent + multiplier * self.indent_step
@@ -204,8 +207,11 @@ def _repr_callable(
     ) -> str:
         """Repr callable object (function or method).
 
+        :param src: Callable to process
         :type src: typing.Union[types.FunctionType, types.MethodType]
+        :param indent: start indentation
         :type indent: int
+        :return: Repr of function or method with signature.
         :rtype: str
         """
         raise NotImplementedError()  # pragma: no cover
@@ -219,9 +225,13 @@ def _repr_simple(
     ) -> str:
         """Repr object without iteration.
 
+        :param src: Source object
         :type src: typing.Any
+        :param indent: start indentation
         :type indent: int
+        :param no_indent_start: ignore indent
         :type no_indent_start: bool
+        :return: simple repr() over object
         :rtype: str
         """
         raise NotImplementedError()  # pragma: no cover
@@ -280,6 +290,7 @@ def _repr_iterable_items(
         :type src: typing.Iterable
         :param indent: start indentation
         :type indent: int
+        :return: repr of element in iterable item
         :rtype: typing.Iterator[str]
         """
         for elem in src:
@@ -427,9 +438,13 @@ def _repr_simple(
     ) -> str:
         """Repr object without iteration.
 
+        :param src: Source object
         :type src: typing.Any
+        :param indent: start indentation
         :type indent: int
+        :param no_indent_start: ignore indent
         :type no_indent_start: bool
+        :return: simple repr() over object, except strings (add prefix) and set (uniform py2/py3)
         :rtype: str
         """
         indent = 0 if no_indent_start else indent
@@ -458,6 +473,7 @@ def _repr_dict_items(
         :type src: dict
         :param indent: start indentation
         :type indent: int
+        :return: repr of key/value pair from dict
         :rtype: typing.Iterator[str]
         """
         max_len = max((len(repr(key)) for key in src)) if src else 0
@@ -481,8 +497,11 @@ def _repr_callable(
     ) -> str:
         """Repr callable object (function or method).
 
+        :param src: Callable to process
         :type src: typing.Union[types.FunctionType, types.MethodType]
+        :param indent: start indentation
         :type indent: int
+        :return: Repr of function or method with signature.
         :rtype: str
         """
         param_str = ""
@@ -545,6 +564,7 @@ def _repr_iterable_item(
         :type result: str
         :param suffix: suffix
         :type suffix: str
+        :return: formatted repr of "result" with prefix and suffix to explain type.
         :rtype: str
         """
         return (
@@ -600,9 +620,13 @@ def _repr_simple(
     ) -> str:
         """Repr object without iteration.
 
+        :param src: Source object
         :type src: typing.Any
+        :param indent: start indentation
         :type indent: int
+        :param no_indent_start: ignore indent
         :type no_indent_start: bool
+        :return: simple repr() over object, except strings (decode) and set (uniform py2/py3)
         :rtype: str
         """
         indent = 0 if no_indent_start else indent
@@ -631,7 +655,8 @@ def _repr_dict_items(
         :type src: dict
         :param indent: start indentation
         :type indent: int
-        :rtype: typing.Generator[str]
+        :return: repr of key/value pair from dict
+        :rtype: typing.Iterator[str]
         """
         max_len = max((len(str(key)) for key in src)) if src else 0
         for key, val in src.items():
@@ -654,8 +679,11 @@ def _repr_callable(
     ) -> str:
         """Repr callable object (function or method).
 
+        :param src: Callable to process
         :type src: typing.Union[types.FunctionType, types.MethodType]
+        :param indent: start indentation
         :type indent: int
+        :return: Repr of function or method with signature.
         :rtype: str
         """
         param_str = ""
@@ -718,6 +746,7 @@ def _repr_iterable_item(
         :type result: str
         :param suffix: suffix
         :type suffix: str
+        :return: formatted repr of "result" with prefix and suffix to explain type.
         :rtype: str
         """
         return (
diff --git a/setup.cfg b/setup.cfg
index 039d434..fb16d2d 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -40,8 +40,13 @@ exclude =
     __init__.py,
     docs
 ignore =
+show-pep8 = True
 show-source = True
 count = True
+max-line-length = 120
+
+[pydocstyle]
+ignore = D401, D203, D213
 
 [aliases]
 test=pytest
diff --git a/tox.ini b/tox.ini
index 0260c42..fbf59a1 100644
--- a/tox.ini
+++ b/tox.ini
@@ -65,9 +65,9 @@ commands = flake8
 
 [testenv:pep257]
 deps =
-    pep257
+    pydocstyle
 usedevelop = False
-commands = pep257 logwrap
+commands = pydocstyle logwrap
 
 [testenv:install]
 deps =
@@ -98,6 +98,9 @@ show-source = True
 count = True
 max-line-length = 120
 
+[pydocstyle]
+ignore = D401, D203, D213
+
 [testenv:docs]
 deps =
     sphinx