Django, React, Flutter, Python scripting and more
68 articles
Memory leaks in long-running Python applications can slowly degrade performance and eventually crash services. Learn how to use Python's built-in tracemalloc module to identify memory growth, locate problematic allocations, and fix leaks before they impact production.
Many JavaScript developers are surprised when Array.sort() produces unexpected ordering for numbers. Learn why the default sorting behavior works this way, how compare functions solve the problem, and best practices for reliable sorting.
Receiving a CVE report against your open source project can be stressful, but a professional and transparent response can strengthen trust in your software. Learn how to investigate, validate, fix, and communicate security vulnerabilities effectively.
Custom Django middleware can unintentionally break authentication, causing users to appear logged out, lose session data, or encounter unexpected permission errors on specific routes. Learn how to diagnose and fix these issues effectively.
Your useEffect is running twice on every mount and you have no idea why. It's not a bug in your code — React 18 does this on purpose in development. Here's what's happening and how to handle it correctly.
Getting "Excel xlsx file; not supported" after upgrading xlrd? Since xlrd 2.0 removed support for xlsx files, many Python scripts suddenly broke. Learn why this happens, how to fix it using openpyxl, and the best approaches for reading modern Excel files in Python.
Async applications can appear responsive until a hidden deadlock causes tasks to wait forever. Learn how asyncio deadlocks happen, how to detect them early, and how to prevent application freezes in production.
Wondering why your setTimeout() callback executes later than expected in Node.js? Learn how event loop blocking occurs, how timers actually work, and practical techniques to prevent delayed execution.
As open-source projects grow, changelogs can become overwhelming collections of minor commits. Learn how to reduce changelog noise, highlight meaningful changes, and create release notes that users actually read.
Learn why Flutter Platform Channel calls can block the main UI thread, how native code execution affects rendering performance, and proven techniques for building responsive Flutter applications.
Django REST Framework (DRF) makes it easy to build powerful APIs, but performance issues can quickly emerge as your application grows. Slow database queries, inefficient serializers, missing indexes, and lack of caching can significantly impact API response times and user experience.
Learn why boto3 S3 uploads can silently overwrite existing files, how Amazon S3 handles object keys, and practical techniques to prevent accidental data loss in production systems.