diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
index a81d7d6c..2e6d18f1 100644
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@@ -21,18 +21,53 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - name: api-rate-limiter
-            type: python
-            path: PROJECTS/advanced/api-rate-limiter
-          - name: dns-lookup
-            type: python
-            path: PROJECTS/beginner/dns-lookup
+          # Python (ruff) - Beginner
+          - name: caesar-cipher
+            type: ruff
+            path: PROJECTS/beginner/caesar-cipher
           - name: keylogger
-            type: python
+            type: ruff
             path: PROJECTS/beginner/keylogger
-          - name: docker-security-audit
-            type: go
-            path: PROJECTS/beginner/docker-security-audit
+          - name: dns-lookup
+            type: ruff
+            path: PROJECTS/beginner/dns-lookup
+          - name: metadata-scrubber-tool
+            type: ruff
+            path: PROJECTS/beginner/metadata-scrubber-tool
+          - name: network-traffic-analyzer
+            type: ruff
+            path: PROJECTS/beginner/network-traffic-analyzer
+          - name: base64-tool
+            type: ruff
+            path: PROJECTS/beginner/base64-tool
+          - name: c2-beacon-backend
+            type: ruff
+            path: PROJECTS/beginner/c2-beacon/backend
+          # Python (ruff) - Intermediate
+          - name: api-security-scanner-backend
+            type: ruff
+            path: PROJECTS/intermediate/api-security-scanner/backend
+          - name: siem-dashboard-backend
+            type: ruff
+            path: PROJECTS/intermediate/siem-dashboard/backend
+          # Python (ruff) - Advanced
+          - name: bug-bounty-platform-backend
+            type: ruff
+            path: PROJECTS/advanced/bug-bounty-platform/backend
+          - name: encrypted-p2p-chat-backend
+            type: ruff
+            path: PROJECTS/advanced/encrypted-p2p-chat/backend
+          - name: api-rate-limiter
+            type: ruff
+            path: PROJECTS/advanced/api-rate-limiter
+          - name: ai-threat-detection-backend
+            type: ruff
+            path: PROJECTS/advanced/ai-threat-detection/backend
+          # Python (ruff) - Templates
+          - name: fullstack-template-backend
+            type: ruff
+            path: TEMPLATES/fullstack-template/backend
+          # Biome (frontend)
           - name: bug-bounty-platform-frontend
             type: biome
             path: PROJECTS/advanced/bug-bounty-platform/frontend
@@ -51,6 +86,10 @@ jobs:
           - name: fullstack-template-frontend
             type: biome
             path: TEMPLATES/fullstack-template/frontend
+          # Go
+          - name: docker-security-audit
+            type: go
+            path: PROJECTS/beginner/docker-security-audit
 
     defaults:
       run:
@@ -60,28 +99,16 @@ jobs:
     - name: Checkout code
       uses: actions/checkout@v4
 
-    # Python Setup
+    # Ruff Setup
     - name: Set up Python
-      if: matrix.type == 'python'
+      if: matrix.type == 'ruff'
       uses: actions/setup-python@v5
       with:
         python-version: '3.12'
 
-    - name: Cache pip dependencies
-      if: matrix.type == 'python'
-      uses: actions/cache@v4
-      with:
-        path: ~/.cache/pip
-        key: ${{ runner.os }}-pip-${{ matrix.name }}-${{ hashFiles(format('{0}/pyproject.toml', matrix.path)) }}
-        restore-keys: |
-          ${{ runner.os }}-pip-${{ matrix.name }}-
-          ${{ runner.os }}-pip-
-
-    - name: Install Python dependencies
-      if: matrix.type == 'python'
-      run: |
-        python -m pip install --upgrade pip
-        pip install -e ".[dev]"
+    - name: Install ruff
+      if: matrix.type == 'ruff'
+      run: pip install ruff
 
     # Biome Setup
     - name: Setup Node.js
@@ -118,24 +145,9 @@ jobs:
         go-version: '1.21'
         cache-dependency-path: ${{ matrix.path }}/go.sum
 
-    # Python Linting
-    - name: Run pylint
-      if: matrix.type == 'python'
-      id: pylint
-      run: |
-        echo "Running pylint..."
-        if pylint . > pylint-output.txt 2>&1; then
-          echo "PYLINT_PASSED=true" >> $GITHUB_ENV
-          echo "No pylint errors found!"
-        else
-          echo "PYLINT_PASSED=false" >> $GITHUB_ENV
-          echo "Pylint found issues!"
-        fi
-        cat pylint-output.txt
-      continue-on-error: true
-
+    # Ruff Linting
     - name: Run ruff
-      if: matrix.type == 'python'
+      if: matrix.type == 'ruff'
       id: ruff
       run: |
         echo "Running ruff check..."
@@ -149,21 +161,6 @@ jobs:
         cat ruff-output.txt
       continue-on-error: true
 
-    - name: Run mypy
-      if: matrix.type == 'python'
-      id: mypy
-      run: |
-        echo "Running mypy..."
-        if mypy . > mypy-output.txt 2>&1; then
-          echo "MYPY_PASSED=true" >> $GITHUB_ENV
-          echo "No mypy errors found"
-        else
-          echo "MYPY_PASSED=false" >> $GITHUB_ENV
-          echo "Mypy found issues"
-        fi
-        cat mypy-output.txt
-      continue-on-error: true
-
     # Biome Linting
     - name: Run Biome
       if: matrix.type == 'biome'
@@ -196,30 +193,14 @@ jobs:
         cat golangci-output.txt
       continue-on-error: true
 
-    # Create Summary for Python
-    - name: Create Python Lint Summary
-      if: matrix.type == 'python' && github.event_name == 'pull_request'
+    # Create Summary for Ruff
+    - name: Create Ruff Lint Summary
+      if: matrix.type == 'ruff' && github.event_name == 'pull_request'
       run: |
         {
           echo "## Lint Results: ${{ matrix.name }}"
           echo ''
 
-          # Pylint Status
-          if [[ "${{ env.PYLINT_PASSED }}" == "true" ]]; then
-            echo '### Pylint: **Passed**'
-            echo 'No pylint issues found.'
-          else
-            echo '### Pylint: **Issues Found**'
-            echo '<details><summary>View pylint output</summary>'
-            echo ''
-            echo '```'
-            head -100 pylint-output.txt
-            echo '```'
-            echo '</details>'
-          fi
-          echo ''
-
-          # Ruff Status
           if [[ "${{ env.RUFF_PASSED }}" == "true" ]]; then
             echo '### Ruff: **Passed**'
             echo 'No ruff issues found.'
@@ -234,23 +215,7 @@ jobs:
           fi
           echo ''
 
-          # Mypy Status
-          if [[ "${{ env.MYPY_PASSED }}" == "true" ]]; then
-            echo '### Mypy: **Passed**'
-            echo 'No mypy issues found.'
-          else
-            echo '### Mypy: **Issues Found**'
-            echo '<details><summary>View mypy output</summary>'
-            echo ''
-            echo '```'
-            head -100 mypy-output.txt
-            echo '```'
-            echo '</details>'
-          fi
-          echo ''
-
-          # Overall Summary
-          if [[ "${{ env.PYLINT_PASSED }}" == "true" ]] && [[ "${{ env.RUFF_PASSED }}" == "true" ]] && [[ "${{ env.MYPY_PASSED }}" == "true" ]]; then
+          if [[ "${{ env.RUFF_PASSED }}" == "true" ]]; then
             echo '---'
             echo '### All checks passed!'
           else
@@ -269,7 +234,6 @@ jobs:
           echo "## Lint Results: ${{ matrix.name }}"
           echo ''
 
-          # Biome Status
           if [[ "${{ env.BIOME_PASSED }}" == "true" ]]; then
             echo '### Biome: **Passed**'
             echo 'No Biome issues found.'
@@ -284,7 +248,6 @@ jobs:
           fi
           echo ''
 
-          # Overall Summary
           if [[ "${{ env.BIOME_PASSED }}" == "true" ]]; then
             echo '---'
             echo '### All checks passed!'
@@ -304,7 +267,6 @@ jobs:
           echo "## Lint Results: ${{ matrix.name }}"
           echo ''
 
-          # golangci-lint Status
           if [[ "${{ env.GOLANGCI_PASSED }}" == "true" ]]; then
             echo '### golangci-lint: **Passed**'
             echo 'No golangci-lint issues found.'
@@ -319,7 +281,6 @@ jobs:
           fi
           echo ''
 
-          # Overall Summary
           if [[ "${{ env.GOLANGCI_PASSED }}" == "true" ]]; then
             echo '---'
             echo '### All checks passed!'
@@ -344,9 +305,9 @@ jobs:
     # Exit with proper status
     - name: Check lint status
       run: |
-        if [[ "${{ matrix.type }}" == "python" ]]; then
-          if [[ "${{ env.PYLINT_PASSED }}" == "false" ]] || [[ "${{ env.RUFF_PASSED }}" == "false" ]] || [[ "${{ env.MYPY_PASSED }}" == "false" ]]; then
-            echo "Python lint checks failed"
+        if [[ "${{ matrix.type }}" == "ruff" ]]; then
+          if [[ "${{ env.RUFF_PASSED }}" == "false" ]]; then
+            echo "Ruff lint checks failed"
             exit 1
           fi
         elif [[ "${{ matrix.type }}" == "biome" ]]; then
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index eaae4495..8ee84f61 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -1,16 +1,95 @@
 repos:
-  # Python Backend Ruff Checks
+  # Python Ruff Checks
   - repo: https://github.com/astral-sh/ruff-pre-commit
-    rev: v0.15.0
+    rev: v0.15.1
     hooks:
+      # Beginner projects
       - id: ruff
-        name: ruff check (backend)
+        name: ruff check (caesar-cipher)
         args: [--fix, --exit-non-zero-on-fix]
-        files: ^PROJECTS/api-security-scanner/backend/
-        exclude: ^PROJECTS/api-security-scanner/backend/(\.venv|__pycache__|\.pytest_cache)/
+        files: ^PROJECTS/beginner/caesar-cipher/
+        exclude: (\.venv|__pycache__|\.pytest_cache)/
 
+      - id: ruff
+        name: ruff check (keylogger)
+        args: [--fix, --exit-non-zero-on-fix]
+        files: ^PROJECTS/beginner/keylogger/
+        exclude: (\.venv|__pycache__|\.pytest_cache)/
 
-      # TODO: add additional ruff checks for remaining projects
+      - id: ruff
+        name: ruff check (dns-lookup)
+        args: [--fix, --exit-non-zero-on-fix]
+        files: ^PROJECTS/beginner/dns-lookup/
+        exclude: (\.venv|__pycache__|\.pytest_cache)/
+
+      - id: ruff
+        name: ruff check (metadata-scrubber-tool)
+        args: [--fix, --exit-non-zero-on-fix]
+        files: ^PROJECTS/beginner/metadata-scrubber-tool/
+        exclude: (\.venv|__pycache__|\.pytest_cache)/
+
+      - id: ruff
+        name: ruff check (network-traffic-analyzer)
+        args: [--fix, --exit-non-zero-on-fix]
+        files: ^PROJECTS/beginner/network-traffic-analyzer/
+        exclude: (\.venv|__pycache__|\.pytest_cache)/
+
+      - id: ruff
+        name: ruff check (base64-tool)
+        args: [--fix, --exit-non-zero-on-fix]
+        files: ^PROJECTS/beginner/base64-tool/
+        exclude: (\.venv|__pycache__|\.pytest_cache)/
+
+      - id: ruff
+        name: ruff check (c2-beacon backend)
+        args: [--fix, --exit-non-zero-on-fix]
+        files: ^PROJECTS/beginner/c2-beacon/backend/
+        exclude: (\.venv|__pycache__|\.pytest_cache)/
+
+      # Intermediate projects
+      - id: ruff
+        name: ruff check (api-security-scanner backend)
+        args: [--fix, --exit-non-zero-on-fix]
+        files: ^PROJECTS/intermediate/api-security-scanner/backend/
+        exclude: (\.venv|__pycache__|\.pytest_cache)/
+
+      - id: ruff
+        name: ruff check (siem-dashboard backend)
+        args: [--fix, --exit-non-zero-on-fix]
+        files: ^PROJECTS/intermediate/siem-dashboard/backend/
+        exclude: (\.venv|__pycache__|\.pytest_cache)/
+
+      # Advanced projects
+      - id: ruff
+        name: ruff check (bug-bounty-platform backend)
+        args: [--fix, --exit-non-zero-on-fix]
+        files: ^PROJECTS/advanced/bug-bounty-platform/backend/
+        exclude: (\.venv|__pycache__|\.pytest_cache)/
+
+      - id: ruff
+        name: ruff check (encrypted-p2p-chat backend)
+        args: [--fix, --exit-non-zero-on-fix]
+        files: ^PROJECTS/advanced/encrypted-p2p-chat/backend/
+        exclude: (\.venv|__pycache__|\.pytest_cache)/
+
+      - id: ruff
+        name: ruff check (api-rate-limiter)
+        args: [--fix, --exit-non-zero-on-fix]
+        files: ^PROJECTS/advanced/api-rate-limiter/
+        exclude: (\.venv|__pycache__|\.pytest_cache)/
+
+      - id: ruff
+        name: ruff check (ai-threat-detection backend)
+        args: [--fix, --exit-non-zero-on-fix]
+        files: ^PROJECTS/advanced/ai-threat-detection/backend/
+        exclude: (\.venv|__pycache__|\.pytest_cache)/
+
+      # Templates
+      - id: ruff
+        name: ruff check (fullstack-template backend)
+        args: [--fix, --exit-non-zero-on-fix]
+        files: ^TEMPLATES/fullstack-template/backend/
+        exclude: (\.venv|__pycache__|\.pytest_cache)/
 
 
       # TODO: add golangci checks for GO projects
diff --git a/PROJECTS/advanced/ai-threat-detection/backend/app/core/detection/rules.py b/PROJECTS/advanced/ai-threat-detection/backend/app/core/detection/rules.py
index 92b41e8f..04a86c77 100644
--- a/PROJECTS/advanced/ai-threat-detection/backend/app/core/detection/rules.py
+++ b/PROJECTS/advanced/ai-threat-detection/backend/app/core/detection/rules.py
@@ -115,7 +115,7 @@ class RuleEngine:
 
         for trule in _THRESHOLD_RULES:
             value = features.get(trule.feature_key, 0)
-            if isinstance(value, (int, float)) and value > trule.threshold:
+            if isinstance(value, int | float) and value > trule.threshold:
                 matched.append((trule.name, trule.score))
 
         if not matched:
diff --git a/PROJECTS/advanced/ai-threat-detection/backend/tests/test_api.py b/PROJECTS/advanced/ai-threat-detection/backend/tests/test_api.py
index 8441e262..45b33567 100644
--- a/PROJECTS/advanced/ai-threat-detection/backend/tests/test_api.py
+++ b/PROJECTS/advanced/ai-threat-detection/backend/tests/test_api.py
@@ -26,7 +26,7 @@ async def test_health_returns_200() -> None:
     data = response.json()
     assert data["status"] == "healthy"
     assert "uptime_seconds" in data
-    assert isinstance(data["uptime_seconds"], (int, float))
+    assert isinstance(data["uptime_seconds"], int | float)
     assert "pipeline_running" in data
 
 
diff --git a/PROJECTS/advanced/api-rate-limiter/examples/app.py b/PROJECTS/advanced/api-rate-limiter/examples/app.py
index 142af93c..1b0ffd8d 100644
--- a/PROJECTS/advanced/api-rate-limiter/examples/app.py
+++ b/PROJECTS/advanced/api-rate-limiter/examples/app.py
@@ -6,7 +6,6 @@ app.py
 from __future__ import annotations
 
 import uvicorn
-from typing import Annotated
 from contextlib import asynccontextmanager
 
 from fastapi import (
@@ -17,7 +16,6 @@ from fastapi import (
 from fastapi_420 import (
     RateLimiter,
     RateLimiterSettings,
-    RateLimitMiddleware,
     ScopedRateLimiter,
     FingerprintSettings,
     StorageSettings,
diff --git a/PROJECTS/advanced/api-rate-limiter/tests/conftest.py b/PROJECTS/advanced/api-rate-limiter/tests/conftest.py
index 0473431c..9370889f 100644
--- a/PROJECTS/advanced/api-rate-limiter/tests/conftest.py
+++ b/PROJECTS/advanced/api-rate-limiter/tests/conftest.py
@@ -10,15 +10,12 @@ import time
 from collections.abc import AsyncGenerator, Generator
 from dataclasses import dataclass, field
 from typing import Any
-from unittest.mock import MagicMock
 
 import pytest
 from fastapi import FastAPI, Request
 from httpx import ASGITransport, AsyncClient
 from starlette.testclient import TestClient
 
-from fastapi_420.algorithms import create_algorithm
-from fastapi_420.algorithms.base import BaseAlgorithm
 from fastapi_420.algorithms.fixed_window import FixedWindowAlgorithm
 from fastapi_420.algorithms.sliding_window import SlidingWindowAlgorithm
 from fastapi_420.algorithms.token_bucket import TokenBucketAlgorithm
@@ -50,7 +47,6 @@ from fastapi_420.types import (
     RateLimitKey,
     RateLimitResult,
     RateLimitRule,
-    StorageType,
     TokenBucketState,
     WindowState,
 )
@@ -687,7 +683,7 @@ def rate_limiter_settings(
 
 
 @pytest.fixture
-async def memory_storage() -> AsyncGenerator[MemoryStorage, None]:
+async def memory_storage() -> AsyncGenerator[MemoryStorage]:
     """
     Create and manage MemoryStorage instance
     """
@@ -791,8 +787,7 @@ async def circuit_breaker() -> CircuitBreaker:
 async def rate_limiter(
     rate_limiter_settings: RateLimiterSettings,
     memory_storage: MemoryStorage,
-) -> AsyncGenerator[RateLimiter,
-                    None]:
+) -> AsyncGenerator[RateLimiter]:
     """
     Create and manage RateLimiter instance
     """
@@ -922,8 +917,7 @@ async def test_app_with_limiter(
 
 
 @pytest.fixture
-async def async_client(test_app: FastAPI) -> AsyncGenerator[AsyncClient,
-                                                            None]:
+async def async_client(test_app: FastAPI) -> AsyncGenerator[AsyncClient]:
     """
     Create async HTTP client for testing
     """
@@ -937,8 +931,7 @@ async def async_client(test_app: FastAPI) -> AsyncGenerator[AsyncClient,
 @pytest.fixture
 async def rate_limited_client(
     test_app_with_limiter: FastAPI,
-) -> AsyncGenerator[AsyncClient,
-                    None]:
+) -> AsyncGenerator[AsyncClient]:
     """
     Create async HTTP client with rate limiting
     """
@@ -950,7 +943,7 @@ async def rate_limited_client(
 
 
 @pytest.fixture
-def sync_client(test_app: FastAPI) -> Generator[TestClient, None, None]:
+def sync_client(test_app: FastAPI) -> Generator[TestClient]:
     """
     Create sync test client
     """
diff --git a/PROJECTS/advanced/api-rate-limiter/tests/test_algorithms.py b/PROJECTS/advanced/api-rate-limiter/tests/test_algorithms.py
index 70d68e6a..681966d5 100644
--- a/PROJECTS/advanced/api-rate-limiter/tests/test_algorithms.py
+++ b/PROJECTS/advanced/api-rate-limiter/tests/test_algorithms.py
@@ -4,7 +4,6 @@ test_algorithms.py
 """
 from __future__ import annotations
 
-import time
 
 import pytest
 
@@ -17,7 +16,6 @@ from fastapi_420.types import Algorithm
 
 from tests.conftest import (
     WINDOW_MINUTE,
-    WINDOW_SECOND,
     RuleFactory,
 )
 
@@ -75,8 +73,8 @@ class TestSlidingWindowAlgorithm:
         storage = MemoryStorage()
         rule = RuleFactory.per_minute(100)
 
-        for i in range(50):
-            result = await algo.check(storage, f"multi_key", rule)
+        for _i in range(50):
+            result = await algo.check(storage, "multi_key", rule)
             assert result.allowed is True
 
         assert result.remaining == 50
diff --git a/PROJECTS/advanced/api-rate-limiter/tests/test_fingerprinting.py b/PROJECTS/advanced/api-rate-limiter/tests/test_fingerprinting.py
index 09a68b9a..d0d3bbff 100644
--- a/PROJECTS/advanced/api-rate-limiter/tests/test_fingerprinting.py
+++ b/PROJECTS/advanced/api-rate-limiter/tests/test_fingerprinting.py
@@ -67,7 +67,7 @@ class TestIPExtractor:
     def test_ipv6_custom_prefix_length(self) -> None:
         extractor = IPExtractor(ipv6_prefix_length = 48)
         request = RequestFactory.create(client_ip = TEST_IP_V6)
-        raw_ip, normalized_ip = extractor.extract(request)
+        _, normalized_ip = extractor.extract(request)
 
         assert "::" in normalized_ip or normalized_ip != TEST_IP_V6
 
@@ -75,7 +75,7 @@ class TestIPExtractor:
         extractor = IPExtractor()
         ipv4_mapped = "::ffff:192.168.1.100"
         request = RequestFactory.create(client_ip = ipv4_mapped)
-        raw_ip, normalized_ip = extractor.extract(request)
+        _, normalized_ip = extractor.extract(request)
 
         assert normalized_ip == "192.168.1.100"
 
@@ -323,7 +323,7 @@ class TestAuthExtractor:
         extractor = AuthExtractor(hash_identifiers = False)
         request = RequestFactory.with_auth(
             auth_type = "bearer",
-            token = "invalid"
+            token = "invalid"  # noqa: S106
         )
         identifier = extractor.extract(request)
 
diff --git a/PROJECTS/advanced/api-rate-limiter/tests/test_limiter.py b/PROJECTS/advanced/api-rate-limiter/tests/test_limiter.py
index 3694f7b6..874f1a92 100644
--- a/PROJECTS/advanced/api-rate-limiter/tests/test_limiter.py
+++ b/PROJECTS/advanced/api-rate-limiter/tests/test_limiter.py
@@ -10,11 +10,9 @@ from fastapi_420.config import RateLimiterSettings
 from fastapi_420.exceptions import EnhanceYourCalm, HTTP_420_ENHANCE_YOUR_CALM
 from fastapi_420.limiter import RateLimiter
 from fastapi_420.storage import MemoryStorage
-from fastapi_420.types import Algorithm, FingerprintLevel
+from fastapi_420.types import Algorithm
 
 from tests.conftest import (
-    WINDOW_MINUTE,
-    DEFAULT_LIMIT_REQUESTS,
     RequestFactory,
 )
 
diff --git a/PROJECTS/advanced/api-rate-limiter/tests/test_storage.py b/PROJECTS/advanced/api-rate-limiter/tests/test_storage.py
index 349b7245..397196df 100644
--- a/PROJECTS/advanced/api-rate-limiter/tests/test_storage.py
+++ b/PROJECTS/advanced/api-rate-limiter/tests/test_storage.py
@@ -15,8 +15,6 @@ from fastapi_420.types import StorageType
 
 from tests.conftest import (
     WINDOW_MINUTE,
-    WINDOW_SECOND,
-    DEFAULT_LIMIT_REQUESTS,
 )
 
 
@@ -163,7 +161,6 @@ class TestMemoryStorageSlidingWindow:
         previous_window = current_window - 1
 
         prev_key = f"{key}:{previous_window}"
-        curr_key = f"{key}:{current_window}"
 
         storage._windows[prev_key] = storage._windows.__class__().__class__
         from fastapi_420.storage.memory import WindowEntry
@@ -360,7 +357,6 @@ class TestMemoryStorageCleanup:
         storage = MemoryStorage(cleanup_interval = 1)
         await storage.start_cleanup_task()
 
-        task = storage._cleanup_task
         await storage.close()
 
         assert storage._cleanup_task is None
diff --git a/PROJECTS/advanced/bug-bounty-platform/backend/app/config.py b/PROJECTS/advanced/bug-bounty-platform/backend/app/config.py
index 77261727..89cafe19 100644
--- a/PROJECTS/advanced/bug-bounty-platform/backend/app/config.py
+++ b/PROJECTS/advanced/bug-bounty-platform/backend/app/config.py
@@ -188,9 +188,8 @@ class Settings(BaseSettings):
         """
         Enforce security constraints in production environment.
         """
-        if self.ENVIRONMENT == Environment.PRODUCTION:
-            if self.DEBUG:
-                raise ValueError("DEBUG must be False in production")
+        if self.ENVIRONMENT == Environment.PRODUCTION and self.DEBUG:
+            raise ValueError("DEBUG must be False in production")
         return self
 
 
diff --git a/PROJECTS/advanced/bug-bounty-platform/backend/app/factory.py b/PROJECTS/advanced/bug-bounty-platform/backend/app/factory.py
index c8f790e4..87024b26 100644
--- a/PROJECTS/advanced/bug-bounty-platform/backend/app/factory.py
+++ b/PROJECTS/advanced/bug-bounty-platform/backend/app/factory.py
@@ -12,7 +12,7 @@ from fastapi.responses import JSONResponse
 from slowapi import _rate_limit_exceeded_handler
 from slowapi.errors import RateLimitExceeded
 
-from config import settings, Environment, API_PREFIX
+from config import settings, API_PREFIX
 from core.database import sessionmanager
 from core.exceptions import BaseAppException
 from core.logging import configure_logging
@@ -74,8 +74,6 @@ def create_app() -> FastAPI:
     """
     Application factory
     """
-    is_production = settings.ENVIRONMENT == Environment.PRODUCTION
-
     app = FastAPI(
         title = settings.APP_NAME,
         summary = settings.APP_SUMMARY,
diff --git a/PROJECTS/advanced/encrypted-p2p-chat/backend/app/api/encryption.py b/PROJECTS/advanced/encrypted-p2p-chat/backend/app/api/encryption.py
index 1a30faf2..355e7504 100644
--- a/PROJECTS/advanced/encrypted-p2p-chat/backend/app/api/encryption.py
+++ b/PROJECTS/advanced/encrypted-p2p-chat/backend/app/api/encryption.py
@@ -4,7 +4,6 @@ Encryption endpoints for X3DH prekey bundles
 """
 
 import logging
-from typing import Optional
 from uuid import UUID
 
 from fastapi import APIRouter, Depends, status
diff --git a/PROJECTS/beginner/c2-beacon/backend/tests/conftest.py b/PROJECTS/beginner/c2-beacon/backend/tests/conftest.py
index 196689ea..2acc3424 100644
--- a/PROJECTS/beginner/c2-beacon/backend/tests/conftest.py
+++ b/PROJECTS/beginner/c2-beacon/backend/tests/conftest.py
@@ -3,7 +3,6 @@ AngelaMos | 2026
 conftest.py
 """
 
-import tempfile
 from pathlib import Path
 
 import pytest
diff --git a/PROJECTS/beginner/c2-beacon/backend/tests/test_encoding.py b/PROJECTS/beginner/c2-beacon/backend/tests/test_encoding.py
index 4c4027f8..02ee1842 100644
--- a/PROJECTS/beginner/c2-beacon/backend/tests/test_encoding.py
+++ b/PROJECTS/beginner/c2-beacon/backend/tests/test_encoding.py
@@ -3,7 +3,6 @@ AngelaMos | 2026
 test_encoding.py
 """
 
-import pytest
 
 from core.encoding import decode, encode, xor_bytes
 
diff --git a/PROJECTS/beginner/c2-beacon/backend/tests/test_protocol.py b/PROJECTS/beginner/c2-beacon/backend/tests/test_protocol.py
index a837c453..53604bde 100644
--- a/PROJECTS/beginner/c2-beacon/backend/tests/test_protocol.py
+++ b/PROJECTS/beginner/c2-beacon/backend/tests/test_protocol.py
@@ -8,7 +8,6 @@ import pytest
 from core.models import CommandType
 from core.protocol import Message, MessageType, pack, unpack
 
-
 TEST_KEY = "test-protocol-key"
 
 
diff --git a/PROJECTS/beginner/c2-beacon/backend/tests/test_tasking.py b/PROJECTS/beginner/c2-beacon/backend/tests/test_tasking.py
index 631639cd..8d56f224 100644
--- a/PROJECTS/beginner/c2-beacon/backend/tests/test_tasking.py
+++ b/PROJECTS/beginner/c2-beacon/backend/tests/test_tasking.py
@@ -172,11 +172,12 @@ class TestTaskManager:
             await asyncio.sleep(0.1)
             await task_manager.submit(_make_task("delayed"), db)
 
-        asyncio.create_task(delayed_submit())
+        background_task = asyncio.create_task(delayed_submit())
         retrieved = await asyncio.wait_for(
             task_manager.get_next("beacon-t"), timeout=2.0
         )
         assert retrieved.id == "delayed"
+        await background_task
 
     def test_remove_queue(self, task_manager: TaskManager) -> None:
         """
diff --git a/PROJECTS/beginner/dns-lookup/dnslookup/resolver.py b/PROJECTS/beginner/dns-lookup/dnslookup/resolver.py
index 31a121b5..165b94d1 100644
--- a/PROJECTS/beginner/dns-lookup/dnslookup/resolver.py
+++ b/PROJECTS/beginner/dns-lookup/dnslookup/resolver.py
@@ -9,10 +9,7 @@ from __future__ import annotations
 
 import asyncio
 import time
-from dataclasses import (
-    dataclass,
-    field
-)
+from dataclasses import dataclass, field
 from enum import StrEnum
 from typing import Any
 
diff --git a/PROJECTS/beginner/metadata-scrubber-tool/scripts/generate_png_tests.py b/PROJECTS/beginner/metadata-scrubber-tool/scripts/generate_png_tests.py
index 7cab3219..ac1a6d6b 100644
--- a/PROJECTS/beginner/metadata-scrubber-tool/scripts/generate_png_tests.py
+++ b/PROJECTS/beginner/metadata-scrubber-tool/scripts/generate_png_tests.py
@@ -5,7 +5,6 @@ from pathlib import Path
 
 from PIL import Image, PngImagePlugin
 
-
 dest_dir = Path("tests/assets/test_images")
 
 # Generate 45 PNG images with various metadata
diff --git a/PROJECTS/beginner/metadata-scrubber-tool/src/commands/read.py b/PROJECTS/beginner/metadata-scrubber-tool/src/commands/read.py
index c827b0da..01ba37ff 100644
--- a/PROJECTS/beginner/metadata-scrubber-tool/src/commands/read.py
+++ b/PROJECTS/beginner/metadata-scrubber-tool/src/commands/read.py
@@ -15,7 +15,6 @@ from src.services.metadata_factory import MetadataFactory
 from src.utils.display import print_metadata_table
 from src.utils.get_target_files import get_target_files
 
-
 console = Console()
 log = logging.getLogger("metadata-scrubber")
 
diff --git a/PROJECTS/beginner/metadata-scrubber-tool/src/commands/scrub.py b/PROJECTS/beginner/metadata-scrubber-tool/src/commands/scrub.py
index ef6f3b1c..c580f33e 100644
--- a/PROJECTS/beginner/metadata-scrubber-tool/src/commands/scrub.py
+++ b/PROJECTS/beginner/metadata-scrubber-tool/src/commands/scrub.py
@@ -27,7 +27,6 @@ from src.services.batch_processor import BatchProcessor
 from src.utils.display import print_batch_summary
 from src.utils.get_target_files import get_target_files
 
-
 console = Console()
 log = logging.getLogger("metadata-scrubber")
 
diff --git a/PROJECTS/beginner/metadata-scrubber-tool/src/commands/verify.py b/PROJECTS/beginner/metadata-scrubber-tool/src/commands/verify.py
index 2b40810f..f0a99c9b 100644
--- a/PROJECTS/beginner/metadata-scrubber-tool/src/commands/verify.py
+++ b/PROJECTS/beginner/metadata-scrubber-tool/src/commands/verify.py
@@ -14,7 +14,6 @@ from rich.console import Console
 from src.services.metadata_factory import MetadataFactory
 from src.services.report_generator import ReportGenerator
 
-
 console = Console()
 log = logging.getLogger("metadata-scrubber")
 
diff --git a/PROJECTS/beginner/metadata-scrubber-tool/src/core/png_metadata.py b/PROJECTS/beginner/metadata-scrubber-tool/src/core/png_metadata.py
index f970a28a..30cf78d9 100644
--- a/PROJECTS/beginner/metadata-scrubber-tool/src/core/png_metadata.py
+++ b/PROJECTS/beginner/metadata-scrubber-tool/src/core/png_metadata.py
@@ -91,7 +91,7 @@ class PngProcessor:
                 if key in ("icc_profile", "exif", "transparency", "gamma"):
                     continue
 
-                if isinstance(value, (str, bytes)):
+                if isinstance(value, str | bytes):
                     found_metadata = True
                     if isinstance(value, bytes):
                         try:
diff --git a/PROJECTS/beginner/metadata-scrubber-tool/src/services/batch_processor.py b/PROJECTS/beginner/metadata-scrubber-tool/src/services/batch_processor.py
index b7bee94a..222452de 100644
--- a/PROJECTS/beginner/metadata-scrubber-tool/src/services/batch_processor.py
+++ b/PROJECTS/beginner/metadata-scrubber-tool/src/services/batch_processor.py
@@ -19,7 +19,6 @@ from rich.console import Console
 
 from src.services.metadata_factory import MetadataFactory
 
-
 log = logging.getLogger("metadata-scrubber")
 console = Console()
 
diff --git a/PROJECTS/beginner/metadata-scrubber-tool/src/utils/display.py b/PROJECTS/beginner/metadata-scrubber-tool/src/utils/display.py
index 04ea030b..531d8e4f 100644
--- a/PROJECTS/beginner/metadata-scrubber-tool/src/utils/display.py
+++ b/PROJECTS/beginner/metadata-scrubber-tool/src/utils/display.py
@@ -15,7 +15,6 @@ from rich.text import Text
 
 from src.utils.formatter import clean_value
 
-
 console = Console()
 
 
diff --git a/PROJECTS/beginner/metadata-scrubber-tool/tests/e2e/test_read_command.py b/PROJECTS/beginner/metadata-scrubber-tool/tests/e2e/test_read_command.py
index bc4cb48a..4640b6ec 100644
--- a/PROJECTS/beginner/metadata-scrubber-tool/tests/e2e/test_read_command.py
+++ b/PROJECTS/beginner/metadata-scrubber-tool/tests/e2e/test_read_command.py
@@ -22,7 +22,6 @@ from tests.conftest import (
     get_xlsx_test_file,
 )
 
-
 runner = CliRunner()
 
 # Test file paths (cross-platform)
diff --git a/PROJECTS/beginner/metadata-scrubber-tool/tests/e2e/test_scrub_command.py b/PROJECTS/beginner/metadata-scrubber-tool/tests/e2e/test_scrub_command.py
index d9e77734..b00cb35c 100644
--- a/PROJECTS/beginner/metadata-scrubber-tool/tests/e2e/test_scrub_command.py
+++ b/PROJECTS/beginner/metadata-scrubber-tool/tests/e2e/test_scrub_command.py
@@ -22,7 +22,6 @@ from tests.conftest import (
     get_xlsx_test_file,
 )
 
-
 runner = CliRunner()
 
 # Test file paths (cross-platform)
diff --git a/PROJECTS/beginner/metadata-scrubber-tool/tests/e2e/test_verify_command.py b/PROJECTS/beginner/metadata-scrubber-tool/tests/e2e/test_verify_command.py
index 0d9592ac..0da4bad0 100644
--- a/PROJECTS/beginner/metadata-scrubber-tool/tests/e2e/test_verify_command.py
+++ b/PROJECTS/beginner/metadata-scrubber-tool/tests/e2e/test_verify_command.py
@@ -13,7 +13,6 @@ from typer.testing import CliRunner
 
 from src.main import app
 
-
 runner = CliRunner()
 
 
diff --git a/PROJECTS/beginner/metadata-scrubber-tool/tests/integration/test_metadata_factory.py b/PROJECTS/beginner/metadata-scrubber-tool/tests/integration/test_metadata_factory.py
index 78a62220..bd46ac79 100644
--- a/PROJECTS/beginner/metadata-scrubber-tool/tests/integration/test_metadata_factory.py
+++ b/PROJECTS/beginner/metadata-scrubber-tool/tests/integration/test_metadata_factory.py
@@ -44,7 +44,7 @@ def test_read_image_metadata(x):
     assert handler.metadata == metadata
     assert isinstance(metadata, dict)
 
-    if isinstance(handler, (JpegProcessor, PngProcessor)):
+    if isinstance(handler, JpegProcessor | PngProcessor):
         assert (
             handler.tags_to_delete is not None or handler.text_keys_to_delete is not None
         )
diff --git a/PROJECTS/beginner/network-traffic-analyzer/tests/test_filters.py b/PROJECTS/beginner/network-traffic-analyzer/tests/test_filters.py
index 8ecf2c4a..eda0abf3 100644
--- a/PROJECTS/beginner/network-traffic-analyzer/tests/test_filters.py
+++ b/PROJECTS/beginner/network-traffic-analyzer/tests/test_filters.py
@@ -91,7 +91,7 @@ class TestFilterBuilder:
         Verify OR operator joins expressions
         """
         result = (
-            FilterBuilder().port(80).port(443).build(operator = "or")
+            FilterBuilder().port(80).port(443).build(operator="or")
         )
         assert result == "port 80 or port 443"
 
@@ -137,14 +137,14 @@ class TestCombineFilters:
         """
         Verify multiple filters combine with AND
         """
-        result = combine_filters(["tcp", "port 80"], operator = "and")
+        result = combine_filters(["tcp", "port 80"], operator="and")
         assert result == "(tcp) and (port 80)"
 
     def test_combine_multiple_or(self):
         """
         Verify multiple filters combine with OR
         """
-        result = combine_filters(["port 80", "port 443"], operator = "or")
+        result = combine_filters(["port 80", "port 443"], operator="or")
         assert result == "(port 80) or (port 443)"
 
 
diff --git a/PROJECTS/beginner/network-traffic-analyzer/tests/test_models.py b/PROJECTS/beginner/network-traffic-analyzer/tests/test_models.py
index 73e691c6..1f68ebc4 100644
--- a/PROJECTS/beginner/network-traffic-analyzer/tests/test_models.py
+++ b/PROJECTS/beginner/network-traffic-analyzer/tests/test_models.py
@@ -5,6 +5,7 @@ test_models.py
 Basic happy path tests for data models
 """
 
+
 import pytest
 
 from netanal.models import (
@@ -43,16 +44,16 @@ class TestPacketInfo:
         Verify PacketInfo stores all fields correctly
         """
         packet = PacketInfo(
-            timestamp = 1234567890.123,
-            src_ip = "192.168.1.1",
-            dst_ip = "192.168.1.2",
-            protocol = Protocol.TCP,
-            size = 1500,
-            src_port = 443,
-            dst_port = 54321,
+            timestamp=1234567890.123,
+            src_ip="192.168.1.1",
+            dst_ip="192.168.1.2",
+            protocol=Protocol.TCP,
+            size=1500,
+            src_port=443,
+            dst_port=54321,
         )
 
-        assert packet.timestamp == 1234567890.123
+        assert packet.timestamp == pytest.approx(1234567890.123)
         assert packet.src_ip == "192.168.1.1"
         assert packet.dst_ip == "192.168.1.2"
         assert packet.protocol == Protocol.TCP
@@ -65,11 +66,11 @@ class TestPacketInfo:
         Verify optional fields default to None
         """
         packet = PacketInfo(
-            timestamp = 0.0,
-            src_ip = "10.0.0.1",
-            dst_ip = "10.0.0.2",
-            protocol = Protocol.ICMP,
-            size = 64,
+            timestamp=0.0,
+            src_ip="10.0.0.1",
+            dst_ip="10.0.0.2",
+            protocol=Protocol.ICMP,
+            size=64,
         )
 
         assert packet.src_port is None
@@ -99,16 +100,16 @@ class TestCaptureConfig:
         Verify custom configuration is stored correctly
         """
         config = CaptureConfig(
-            interface = "eth0",
-            bpf_filter = "tcp port 80",
-            packet_count = 100,
-            timeout_seconds = 30.0,
+            interface="eth0",
+            bpf_filter="tcp port 80",
+            packet_count=100,
+            timeout_seconds=30.0,
         )
 
         assert config.interface == "eth0"
         assert config.bpf_filter == "tcp port 80"
         assert config.packet_count == 100
-        assert config.timeout_seconds == 30.0
+        assert config.timeout_seconds == pytest.approx(30.0)
 
 
 class TestEndpointStats:
@@ -119,7 +120,7 @@ class TestEndpointStats:
         """
         Verify total_packets and total_bytes computed properties
         """
-        endpoint = EndpointStats(ip_address = "192.168.1.100")
+        endpoint = EndpointStats(ip_address="192.168.1.100")
         endpoint.packets_sent = 50
         endpoint.packets_received = 30
         endpoint.bytes_sent = 5000
@@ -149,36 +150,36 @@ class TestCaptureStatistics:
         Verify duration_seconds computed property
         """
         stats = CaptureStatistics(
-            start_time = 1000.0,
-            end_time = 1010.0,
+            start_time=1000.0,
+            end_time=1010.0,
         )
 
-        assert stats.duration_seconds == 10.0
+        assert stats.duration_seconds == pytest.approx(10.0)
 
     def test_average_bandwidth(self):
         """
         Verify average_bandwidth calculation (bytes/second)
         """
         stats = CaptureStatistics(
-            start_time = 1000.0,
-            end_time = 1010.0,
-            total_bytes = 10000,
+            start_time=1000.0,
+            end_time=1010.0,
+            total_bytes=10000,
         )
 
-        assert stats.average_bandwidth == 1000.0
+        assert stats.average_bandwidth == pytest.approx(1000.0)
 
     def test_protocol_percentages(self):
         """
         Verify get_protocol_percentages returns correct distribution
         """
-        stats = CaptureStatistics(total_packets = 100)
+        stats = CaptureStatistics(total_packets=100)
         stats.protocol_distribution[Protocol.TCP] = 70
         stats.protocol_distribution[Protocol.UDP] = 30
 
         percentages = stats.get_protocol_percentages()
 
-        assert percentages[Protocol.TCP] == 70.0
-        assert percentages[Protocol.UDP] == 30.0
+        assert percentages[Protocol.TCP] == pytest.approx(70.0)
+        assert percentages[Protocol.UDP] == pytest.approx(30.0)
 
     def test_top_talkers(self):
         """
@@ -186,15 +187,15 @@ class TestCaptureStatistics:
         """
         stats = CaptureStatistics()
 
-        endpoint1 = EndpointStats(ip_address = "192.168.1.1")
+        endpoint1 = EndpointStats(ip_address="192.168.1.1")
         endpoint1.bytes_sent = 1000
         endpoint1.bytes_received = 500
 
-        endpoint2 = EndpointStats(ip_address = "192.168.1.2")
+        endpoint2 = EndpointStats(ip_address="192.168.1.2")
         endpoint2.bytes_sent = 5000
         endpoint2.bytes_received = 2000
 
-        endpoint3 = EndpointStats(ip_address = "192.168.1.3")
+        endpoint3 = EndpointStats(ip_address="192.168.1.3")
         endpoint3.bytes_sent = 100
         endpoint3.bytes_received = 50
 
@@ -202,7 +203,7 @@ class TestCaptureStatistics:
         stats.endpoints["192.168.1.2"] = endpoint2
         stats.endpoints["192.168.1.3"] = endpoint3
 
-        top = stats.get_top_talkers(limit = 2)
+        top = stats.get_top_talkers(limit=2)
 
         assert len(top) == 2
         assert top[0].ip_address == "192.168.1.2"
diff --git a/PROJECTS/intermediate/api-security-scanner/backend/core/database.py b/PROJECTS/intermediate/api-security-scanner/backend/core/database.py
index d90feeae..3f6e273c 100644
--- a/PROJECTS/intermediate/api-security-scanner/backend/core/database.py
+++ b/PROJECTS/intermediate/api-security-scanner/backend/core/database.py
@@ -28,7 +28,7 @@ SessionLocal = sessionmaker(
 Base = declarative_base()
 
 
-def get_db() -> Generator[Session, None, None]:
+def get_db() -> Generator[Session]:
     """
     FastAPI dependency for database sessions
     """
diff --git a/PROJECTS/intermediate/siem-dashboard/backend/app/engine/normalizer.py b/PROJECTS/intermediate/siem-dashboard/backend/app/engine/normalizer.py
index 968db07c..184bf0e8 100644
--- a/PROJECTS/intermediate/siem-dashboard/backend/app/engine/normalizer.py
+++ b/PROJECTS/intermediate/siem-dashboard/backend/app/engine/normalizer.py
@@ -4,7 +4,8 @@ normalizer.py
 """
 
 from datetime import datetime, UTC
-from typing import Any, Callable
+from typing import Any
+from collections.abc import Callable
 
 from app.models.LogEvent import SourceType