diff --git a/Makefile b/Makefile
index da43c1de67a..e14ccf8dde7 100644
--- a/Makefile
+++ b/Makefile
@@ -83,3 +83,6 @@ release: pr
 changelog:
 	@echo "[+] Pre-generating CHANGELOG for tag: $$(git describe --abbrev=0 --tag)"
 	docker run -v "${PWD}":/workdir quay.io/git-chglog/git-chglog $$(git describe --abbrev=0 --tag).. > TMP_CHANGELOG.md
+
+mypy:
+	poetry run mypy aws_lambda_powertools
diff --git a/aws_lambda_powertools/logging/logger.py b/aws_lambda_powertools/logging/logger.py
index 689409d9813..72e22b38c7f 100644
--- a/aws_lambda_powertools/logging/logger.py
+++ b/aws_lambda_powertools/logging/logger.py
@@ -4,7 +4,7 @@
 import os
 import random
 import sys
-from typing import Any, Callable, Dict, Iterable, Optional, TypeVar, Union
+from typing import IO, Any, Callable, Dict, Iterable, Optional, TypeVar, Union
 
 import jmespath
 
@@ -171,7 +171,7 @@ def __init__(
         level: Union[str, int] = None,
         child: bool = False,
         sampling_rate: float = None,
-        stream: sys.stdout = None,
+        stream: IO[str] = None,
         logger_formatter: Optional[PowertoolsFormatter] = None,
         logger_handler: Optional[logging.Handler] = None,
         **kwargs,
@@ -363,7 +363,7 @@ def registered_handler(self) -> logging.Handler:
     @property
     def registered_formatter(self) -> Optional[PowertoolsFormatter]:
         """Convenience property to access logger formatter"""
-        return self.registered_handler.formatter
+        return self.registered_handler.formatter  # type: ignore
 
     def structure_logs(self, append: bool = False, **keys):
         """Sets logging formatting to JSON.
@@ -384,7 +384,7 @@ def structure_logs(self, append: bool = False, **keys):
             self.append_keys(**keys)
         else:
             log_keys = {**self._default_log_keys, **keys}
-            formatter = self.logger_formatter or LambdaPowertoolsFormatter(**log_keys)
+            formatter = self.logger_formatter or LambdaPowertoolsFormatter(**log_keys)  # type: ignore
             self.registered_handler.setFormatter(formatter)
 
     def set_correlation_id(self, value: str):
@@ -421,7 +421,7 @@ def _get_caller_filename():
 
 
 def set_package_logger(
-    level: Union[str, int] = logging.DEBUG, stream: sys.stdout = None, formatter: logging.Formatter = None
+    level: Union[str, int] = logging.DEBUG, stream: IO[str] = None, formatter: logging.Formatter = None
 ):
     """Set an additional stream handler, formatter, and log level for aws_lambda_powertools package logger.
 
diff --git a/aws_lambda_powertools/utilities/validation/base.py b/aws_lambda_powertools/utilities/validation/base.py
index ec4165f4876..ec63e39eb3c 100644
--- a/aws_lambda_powertools/utilities/validation/base.py
+++ b/aws_lambda_powertools/utilities/validation/base.py
@@ -1,5 +1,5 @@
 import logging
-from typing import Any, Dict, Optional
+from typing import Any, Dict, Optional, Union
 
 import fastjsonschema
 import jmespath
@@ -12,7 +12,7 @@
 logger = logging.getLogger(__name__)
 
 
-def validate_data_against_schema(data: Dict, schema: Dict, formats: Optional[Dict] = None):
+def validate_data_against_schema(data: Union[Dict, str], schema: Dict, formats: Optional[Dict] = None):
     """Validate dict data against given JSON Schema
 
     Parameters
@@ -41,7 +41,7 @@ def validate_data_against_schema(data: Dict, schema: Dict, formats: Optional[Dic
         raise SchemaValidationError(message)
 
 
-def unwrap_event_from_envelope(data: Dict, envelope: str, jmespath_options: Optional[Dict]) -> Any:
+def unwrap_event_from_envelope(data: Union[Dict, str], envelope: str, jmespath_options: Optional[Dict]) -> Any:
     """Searches data using JMESPath expression
 
     Parameters
diff --git a/mypy.ini b/mypy.ini
new file mode 100644
index 00000000000..42185a692ad
--- /dev/null
+++ b/mypy.ini
@@ -0,0 +1,13 @@
+[mypy]
+warn_return_any=False
+warn_unused_configs=True
+no_implicit_optional=True
+warn_redundant_casts=True
+warn_unused_ignores=True
+pretty = True
+show_column_numbers = True
+show_error_codes = True
+show_error_context = True
+
+[mypy-jmespath]
+ignore_missing_imports=True
diff --git a/poetry.lock b/poetry.lock
index 9a6f1fdbc04..adcf21ab460 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -616,6 +616,24 @@ python-versions = ">=3.5"
 [package.dependencies]
 mkdocs-material = ">=5.0.0"
 
+[[package]]
+name = "mypy"
+version = "0.910"
+description = "Optional static typing for Python"
+category = "dev"
+optional = false
+python-versions = ">=3.5"
+
+[package.dependencies]
+mypy-extensions = ">=0.4.3,<0.5.0"
+toml = "*"
+typed-ast = {version = ">=1.4.0,<1.5.0", markers = "python_version < \"3.8\""}
+typing-extensions = ">=3.7.4"
+
+[package.extras]
+dmypy = ["psutil (>=4.0)"]
+python2 = ["typed-ast (>=1.4.0,<1.5.0)"]
+
 [[package]]
 name = "mypy-extensions"
 version = "0.4.3"
@@ -1066,7 +1084,7 @@ pydantic = ["pydantic", "email-validator"]
 [metadata]
 lock-version = "1.1"
 python-versions = "^3.6.1"
-content-hash = "c07aad70013171c8bb000d163f997efef709189584089f68d471f69eb8bb38c0"
+content-hash = "d9c5750e95bd6f09037f407d2f94649c1c52b1d26ec8a50e52d1c9399e427cf9"
 
 [metadata.files]
 appdirs = [
@@ -1195,7 +1213,6 @@ flake8 = [
 ]
 flake8-black = [
     {file = "flake8-black-0.2.1.tar.gz", hash = "sha256:f26651bc10db786c03f4093414f7c9ea982ed8a244cec323c984feeffdf4c118"},
-    {file = "flake8_black-0.2.1-py3-none-any.whl", hash = "sha256:941514149cb8b489cb17a4bb1cf18d84375db3b34381bb018de83509437931a0"},
 ]
 flake8-bugbear = [
     {file = "flake8-bugbear-21.4.3.tar.gz", hash = "sha256:2346c81f889955b39e4a368eb7d508de723d9de05716c287dc860a4073dc57e7"},
@@ -1350,6 +1367,31 @@ mkdocs-material-extensions = [
     {file = "mkdocs-material-extensions-1.0.1.tar.gz", hash = "sha256:6947fb7f5e4291e3c61405bad3539d81e0b3cd62ae0d66ced018128af509c68f"},
     {file = "mkdocs_material_extensions-1.0.1-py3-none-any.whl", hash = "sha256:d90c807a88348aa6d1805657ec5c0b2d8d609c110e62b9dce4daf7fa981fa338"},
 ]
+mypy = [
+    {file = "mypy-0.910-cp35-cp35m-macosx_10_9_x86_64.whl", hash = "sha256:a155d80ea6cee511a3694b108c4494a39f42de11ee4e61e72bc424c490e46457"},
+    {file = "mypy-0.910-cp35-cp35m-manylinux1_x86_64.whl", hash = "sha256:b94e4b785e304a04ea0828759172a15add27088520dc7e49ceade7834275bedb"},
+    {file = "mypy-0.910-cp35-cp35m-manylinux2010_x86_64.whl", hash = "sha256:088cd9c7904b4ad80bec811053272986611b84221835e079be5bcad029e79dd9"},
+    {file = "mypy-0.910-cp35-cp35m-win_amd64.whl", hash = "sha256:adaeee09bfde366d2c13fe6093a7df5df83c9a2ba98638c7d76b010694db760e"},
+    {file = "mypy-0.910-cp36-cp36m-macosx_10_9_x86_64.whl", hash = "sha256:ecd2c3fe726758037234c93df7e98deb257fd15c24c9180dacf1ef829da5f921"},
+    {file = "mypy-0.910-cp36-cp36m-manylinux1_x86_64.whl", hash = "sha256:d9dd839eb0dc1bbe866a288ba3c1afc33a202015d2ad83b31e875b5905a079b6"},
+    {file = "mypy-0.910-cp36-cp36m-manylinux2010_x86_64.whl", hash = "sha256:3e382b29f8e0ccf19a2df2b29a167591245df90c0b5a2542249873b5c1d78212"},
+    {file = "mypy-0.910-cp36-cp36m-win_amd64.whl", hash = "sha256:53fd2eb27a8ee2892614370896956af2ff61254c275aaee4c230ae771cadd885"},
+    {file = "mypy-0.910-cp37-cp37m-macosx_10_9_x86_64.whl", hash = "sha256:b6fb13123aeef4a3abbcfd7e71773ff3ff1526a7d3dc538f3929a49b42be03f0"},
+    {file = "mypy-0.910-cp37-cp37m-manylinux1_x86_64.whl", hash = "sha256:e4dab234478e3bd3ce83bac4193b2ecd9cf94e720ddd95ce69840273bf44f6de"},
+    {file = "mypy-0.910-cp37-cp37m-manylinux2010_x86_64.whl", hash = "sha256:7df1ead20c81371ccd6091fa3e2878559b5c4d4caadaf1a484cf88d93ca06703"},
+    {file = "mypy-0.910-cp37-cp37m-win_amd64.whl", hash = "sha256:0aadfb2d3935988ec3815952e44058a3100499f5be5b28c34ac9d79f002a4a9a"},
+    {file = "mypy-0.910-cp38-cp38-macosx_10_9_x86_64.whl", hash = "sha256:ec4e0cd079db280b6bdabdc807047ff3e199f334050db5cbb91ba3e959a67504"},
+    {file = "mypy-0.910-cp38-cp38-manylinux1_x86_64.whl", hash = "sha256:119bed3832d961f3a880787bf621634ba042cb8dc850a7429f643508eeac97b9"},
+    {file = "mypy-0.910-cp38-cp38-manylinux2010_x86_64.whl", hash = "sha256:866c41f28cee548475f146aa4d39a51cf3b6a84246969f3759cb3e9c742fc072"},
+    {file = "mypy-0.910-cp38-cp38-win_amd64.whl", hash = "sha256:ceb6e0a6e27fb364fb3853389607cf7eb3a126ad335790fa1e14ed02fba50811"},
+    {file = "mypy-0.910-cp39-cp39-macosx_10_9_x86_64.whl", hash = "sha256:1a85e280d4d217150ce8cb1a6dddffd14e753a4e0c3cf90baabb32cefa41b59e"},
+    {file = "mypy-0.910-cp39-cp39-macosx_11_0_arm64.whl", hash = "sha256:42c266ced41b65ed40a282c575705325fa7991af370036d3f134518336636f5b"},
+    {file = "mypy-0.910-cp39-cp39-manylinux1_x86_64.whl", hash = "sha256:3c4b8ca36877fc75339253721f69603a9c7fdb5d4d5a95a1a1b899d8b86a4de2"},
+    {file = "mypy-0.910-cp39-cp39-manylinux2010_x86_64.whl", hash = "sha256:c0df2d30ed496a08de5daed2a9ea807d07c21ae0ab23acf541ab88c24b26ab97"},
+    {file = "mypy-0.910-cp39-cp39-win_amd64.whl", hash = "sha256:c6c2602dffb74867498f86e6129fd52a2770c48b7cd3ece77ada4fa38f94eba8"},
+    {file = "mypy-0.910-py3-none-any.whl", hash = "sha256:ef565033fa5a958e62796867b1df10c40263ea9ded87164d67572834e57a174d"},
+    {file = "mypy-0.910.tar.gz", hash = "sha256:704098302473cb31a218f1775a873b376b30b4c18229421e9e9dc8916fd16150"},
+]
 mypy-extensions = [
     {file = "mypy_extensions-0.4.3-py2.py3-none-any.whl", hash = "sha256:090fedd75945a69ae91ce1303b5824f428daf5a028d2f6ab8a299250a846f15d"},
     {file = "mypy_extensions-0.4.3.tar.gz", hash = "sha256:2d82818f5bb3e369420cb3c4060a7970edba416647068eb4c5343488a6c604a8"},
diff --git a/pyproject.toml b/pyproject.toml
index f7743f2eba2..58579dac1b6 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -52,6 +52,7 @@ flake8-bugbear = "^21.3.2"
 mkdocs-material = "^7.1.9"
 mkdocs-git-revision-date-plugin = "^0.3.1"
 mike = "^0.6.0"
+mypy = "^0.910"
 
 
 [tool.poetry.extras]