diff --git a/.github/workflows/pylint.yml b/.github/workflows/pylint.yml
new file mode 100644
index 0000000..50465f4
--- /dev/null
+++ b/.github/workflows/pylint.yml
@@ -0,0 +1,27 @@
+name: Lint (pylint)
+
+on:
+  pull_request:
+    types: [opened, synchronize, reopened]
+
+jobs:
+  pylint:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: '3.11'
+          cache: 'pip'
+
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install -r requirements-dev.txt
+
+      - name: Run pylint
+        run: |
+          pylint rglob setup.py features
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..5727e45
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,11 @@
+.PHONY: lint
+
+lint:
+	@echo "Running pylint on package, setup, and tests..."
+	pylint rglob setup.py features
+
+.PHONY: dev-setup
+
+dev-setup:
+	@echo "Installing dev dependencies (pylint, behave)..."
+	pip install -r requirements-dev.txt
diff --git a/features/steps/steps.py b/features/steps/steps.py
index fa86af3..825740d 100644
--- a/features/steps/steps.py
+++ b/features/steps/steps.py
@@ -117,7 +117,9 @@ def count_lines_in_files(context, file_type: str) -> None:
 
 @then("I should find {expected_line_count:d} lines")
 def check_line_count(context, expected_line_count: int) -> None:
-    assert context.line_count == expected_line_count, f"Expected {expected_line_count} lines, but found {context.line_count}"
+    assert context.line_count == expected_line_count, (
+        f"Expected {expected_line_count} lines, but found {context.line_count}"
+    )
 
 @when("I change the current working directory to the root directory")
 def change_cwd_to_root(context) -> None:
@@ -129,4 +131,6 @@ def use_rglob_(context, file_type: str) -> None:
 
 @then("I should find {expected_num_files:d} files")
 def check_found_files(context, expected_num_files: int) -> None:
-    assert len(context.found_files) == expected_num_files, f"Expected {expected_num_files} files, but found {len(context.found_files)}"
\ No newline at end of file
+    assert len(context.found_files) == expected_num_files, (
+        f"Expected {expected_num_files} files, but found {len(context.found_files)}"
+    )
diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 0000000..272ae4e
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,9 @@
+[tool.pylint.main]
+recursive = true
+
+[tool.pylint.messages_control]
+disable = []
+
+[tool.pylint.format]
+max-line-length = 100
+
diff --git a/requirements-dev.txt b/requirements-dev.txt
new file mode 100644
index 0000000..78df6b8
--- /dev/null
+++ b/requirements-dev.txt
@@ -0,0 +1,3 @@
+pylint
+behave
+
diff --git a/rglob/__init__.py b/rglob/__init__.py
index ca2caf7..be89892 100644
--- a/rglob/__init__.py
+++ b/rglob/__init__.py
@@ -1 +1,15 @@
-from rglob.rglob import *
+"""Public API for rglob package."""
+
+from rglob.rglob import *  # noqa: F401,F403 re-export convenience
+
+__all__ = [
+    # re-exported from rglob.rglob
+    "rglob",
+    "rglob_",
+    "lcount",
+    "tsize",
+    "kilobytes",
+    "megabytes",
+    "gigabytes",
+    "terabytes",
+]
diff --git a/rglob/cli.py b/rglob/cli.py
index 0bddf57..20583bc 100644
--- a/rglob/cli.py
+++ b/rglob/cli.py
@@ -1,8 +1,20 @@
+"""Command-line interface for rglob helpers."""
+
 import argparse
 import os
-from rglob import rglob, lcount, tsize, kilobytes, megabytes, gigabytes, terabytes
+from rglob import (
+    rglob,
+    lcount,
+    tsize,
+    kilobytes,
+    megabytes,
+    gigabytes,
+    terabytes,
+)
+
+def main() -> None:
+    """Parse arguments and execute rglob CLI commands."""
 
-def main():
     parser = argparse.ArgumentParser(
         description="Recursive file operations.",
         epilog=(
@@ -16,20 +28,41 @@ def main():
     # Find command
     find_parser = subparsers.add_parser("find", help="Find files recursively.")
     find_parser.add_argument("pattern", help="The glob pattern to match.")
-    find_parser.add_argument("--base", default=os.getcwd(), help="The base directory to search in.")
+    find_parser.add_argument(
+        "--base", default=os.getcwd(), help="The base directory to search in."
+    )
 
     # Line count command
-    lcount_parser = subparsers.add_parser("lcount", help="Count lines in files recursively.")
+    lcount_parser = subparsers.add_parser(
+        "lcount", help="Count lines in files recursively."
+    )
     lcount_parser.add_argument("pattern", help="The glob pattern to match.")
-    lcount_parser.add_argument("--base", default=os.getcwd(), help="The base directory to search in.")
-    lcount_parser.add_argument("--no-empty", action="store_true", help="Exclude empty lines.")
-    lcount_parser.add_argument("--no-comments", action="store_true", help="Exclude comment lines (starting with #).")
+    lcount_parser.add_argument(
+        "--base", default=os.getcwd(), help="The base directory to search in."
+    )
+    lcount_parser.add_argument(
+        "--no-empty", action="store_true", help="Exclude empty lines."
+    )
+    lcount_parser.add_argument(
+        "--no-comments",
+        action="store_true",
+        help="Exclude comment lines (starting with #).",
+    )
 
     # Total size command
-    tsize_parser = subparsers.add_parser("tsize", help="Calculate the total size of files recursively.")
+    tsize_parser = subparsers.add_parser(
+        "tsize", help="Calculate the total size of files recursively."
+    )
     tsize_parser.add_argument("pattern", help="The glob pattern to match.")
-    tsize_parser.add_argument("--base", default=os.getcwd(), help="The base directory to search in.")
-    tsize_parser.add_argument("--unit", default="mb", choices=["kb", "mb", "gb", "tb"], help="The unit to display the size in.")
+    tsize_parser.add_argument(
+        "--base", default=os.getcwd(), help="The base directory to search in."
+    )
+    tsize_parser.add_argument(
+        "--unit",
+        default="mb",
+        choices=["kb", "mb", "gb", "tb"],
+        help="The unit to display the size in.",
+    )
 
     args = parser.parse_args()
 
@@ -43,11 +76,15 @@ def main():
             filter_funcs.append(lambda line: line.strip())
         if args.no_comments:
             filter_funcs.append(lambda line: not line.strip().startswith("#"))
-        
+
         def combined_filter(line):
             return all(f(line) for f in filter_funcs)
 
-        count = lcount(args.base, args.pattern, func=combined_filter if filter_funcs else lambda x: True)
+        count = lcount(
+            args.base,
+            args.pattern,
+            func=combined_filter if filter_funcs else (lambda _line: True),
+        )
         print(f"Total lines: {count}")
     elif args.command == "tsize":
         unit_funcs = {
diff --git a/rglob/rglob.py b/rglob/rglob.py
index 3f37e1f..e2e4415 100644
--- a/rglob/rglob.py
+++ b/rglob/rglob.py
@@ -1,84 +1,127 @@
-"""
-Recursive Glob Module
-Methods:
-	rglob(base, pattern)
-	rglob_(pattern)
-	lcount(base, pattern, func=lambda x : True)
-	tsize(base, pattern, func=lambda x : (x / math.pow(2.0, 20))
-"""
-import math
+"""Lightweight recursive glob helpers for files, line counts, and sizes."""
+
+from __future__ import annotations
+
 import glob
+import math
 import os
+from typing import Callable, Iterable, List
+
+
+def kilobytes(value: float) -> float:
+    """Convert bytes to kilobytes (KiB)."""
+
+    return value / math.pow(2.0, 10.0)
+
+
+def megabytes(value: float) -> float:
+    """Convert bytes to megabytes (MiB)."""
+
+    return value / math.pow(2.0, 20.0)
+
+
+def gigabytes(value: float) -> float:
+    """Convert bytes to gigabytes (GiB)."""
+
+    return value / math.pow(2.0, 30.0)
+
+
+def terabytes(value: float) -> float:
+    """Convert bytes to terabytes (TiB)."""
+
+    return value / math.pow(2.0, 40.0)
+
+
+def _get_dirs(base: str) -> List[str]:
+    """Return immediate sub-paths under base that are directories."""
+
+    return [
+        path for path in glob.iglob(os.path.join(base, "*")) if os.path.isdir(path)
+    ]
+
+
+def _count(files: Iterable[str], func: Callable[[str], bool]) -> int:
+    """Count lines across files that satisfy predicate func."""
+
+    total = 0
+    for path in files:
+        with open(path, "r", encoding="utf-8", errors="ignore") as handle:
+            total += sum(1 for line in handle if func(line))
+    return total
+
+
+def _sum(files: Iterable[str]) -> int:
+    """Sum sizes of file paths (ignores directories)."""
+
+    total_size = 0
+    for path in files:
+        if not os.path.isdir(path):
+            total_size += os.path.getsize(path)
+    return total_size
+
+
+def rglob(base: str, pattern: str) -> list[str]:
+    """Recursive glob starting in specified directory."""
+
+    matches: list[str] = []
+    matches.extend(glob.glob(os.path.join(base, pattern)))
+    dirs = _get_dirs(base)
+    if dirs:
+        for dpath in dirs:
+            matches.extend(rglob(dpath, pattern))
+    return matches
+
+
+def rglob_(pattern: str) -> list[str]:
+    """Recursive glob using the current working directory as base."""
+
+    return rglob(os.getcwd(), pattern)
+
+
+def lcount(
+    base: str, pattern: str, func: Callable[[str], bool] = lambda _line: True
+) -> int:
+    """Count number of lines across files found matching pattern.
+
+    Params:
+        base: root directory to start the search
+        pattern: pattern for glob to match (e.g. "*.py")
+        func: boolean filter function applied per line
+            example: lambda line: bool(line.strip())  # don't count empty lines
+            default: lambda line: True
+    """
+
+    all_files = rglob(base, pattern)
+    return _count(all_files, func)
+
+
+def tsize(base: str, pattern: str, func: Callable[[float], float] = megabytes) -> float:
+    """Sum and return the total size of every file found from glob(base, pattern).
+
+    Params:
+        base: root directory to start the search
+        pattern: pattern for glob to match (e.g. "*.py")
+        func: unit prefix conversion function
+            example: lambda x: x / math.pow(2.0, 20.0)  # megabytes
+            default: megabytes
+    """
+
+    all_files = rglob(base, pattern)
+    total_size = _sum(all_files)
+    return func(total_size)
 
-kilobytes = lambda x : (x / math.pow(2.0, 10.0))
-megabytes = lambda x : (x / math.pow(2.0, 20.0))
-gigabytes = lambda x : (x / math.pow(2.0, 30.0))
-terabytes = lambda x : (x / math.pow(2.0, 40.0))
-
-def _getDirs(base):
-	return [x for x in glob.iglob(os.path.join( base, '*')) if os.path.isdir(x) ]
-
-def _count(files, func):
-	lines = 0
-	for f in files:
-		lines += sum([1 for l in open(f) if func(l)])
-	return lines
-
-def _sum(files):
-	total_size = 0
-	for f in files:
-		if not os.path.isdir(f):
-			total_size += os.path.getsize(f)
-	return total_size
-
-
-def rglob(base, pattern):
-	""" Recursive glob starting in specified directory """
-	flist = []
-	flist.extend(glob.glob(os.path.join(base,pattern)))
-	dirs = _getDirs(base)
-	if len(dirs):
-		for d in dirs:
-			flist.extend(rglob(os.path.join(base,d), pattern))
-	return flist
-
-def rglob_(pattern):
-	""" Performs a recursive glob in the current working directory """
-	return rglob(os.getcwd(), pattern)
-
-def lcount(base, pattern, func = lambda x : True):
-	""" Counts the number of lines in each file found matching pattern.
-		Params:
-			base - root directory to start the search
-			pattern - pattern for glob to match (i.e '*.py')
-			func - boolean filter function
-				example: lambda x : True if len(x.strip()) else False #don't count empty lines
-				default: lambda x : True
-	"""
-	all_files = rglob(base, pattern)
-	return _count(all_files, func)
-
-def tsize(base, pattern, func = megabytes ):
-	""" Sums and returns the total size of every file found from glob(base,pattern)
-		Params:
-			base - root directory to start the search
-			pattern - pattern for glob to match (i.e '*.py')
-			func - unit prefix conversion function
-				example: lambda x : (x / math.pow(2.0,20.0)) # megabytes
-				default: func = megabytes 
-	""" 
-	all_files = rglob(base, pattern)
-	total_size = _sum(all_files)
-	return func(total_size)
 
 if __name__ == "__main__":
-	#filter out empty lines and comments
-	filterFunc = lambda x : True if (len(x.strip()) and x.strip()[0] != '#') else False
-    
-	pyFiles = rglob(os.path.dirname(__file__), "*.py")
-	print(" {} total lines".format(_count(pyFiles, filterFunc)))
-	
-	pyFiles_ = rglob_("*.py")
-	print(" {} total lines".format(_count(pyFiles_, filterFunc)))
-	print(" {} total lines".format(lcount(os.path.dirname(__file__), "*.py", filterFunc)))
-	
+    # Filter out empty lines and comments.
+    def filter_func(line: str) -> bool:
+        """Return True for non-empty, non-comment lines."""
+        return bool(line.strip()) and not line.strip().startswith("#")
+
+    py_files = rglob(os.path.dirname(__file__), "*.py")
+    print(f"{_count(py_files, filter_func)} total lines")
+
+    py_files_cwd = rglob_("*.py")
+    print(f"{_count(py_files_cwd, filter_func)} total lines")
+    print(
+        f"{lcount(os.path.dirname(__file__), '*.py', filter_func)} total lines"
+    )
diff --git a/setup.py b/setup.py
index 4ac5cc9..ca1eaa6 100644
--- a/setup.py
+++ b/setup.py
@@ -1,6 +1,7 @@
 #!/usr/bin/env python
+"""Package configuration for rglob."""
 
-from setuptools import setup, Extension
+from setuptools import setup
 
 setup(name='rglob',
       version='1.7',