Buglyst Blog
Learn to debug under pressure.
Playbooks for fast pattern recognition, guides for the full investigation, and articles for the engineering judgment around the edges.
17 playbooks · 509 guides · 95 articles · 12 linked practice labs ·skip to practice
Fast pattern recognition for the production failures engineers see most often.
17 playbooks
Debugging Env Var Issues
A concise checklist for incidents where local works but CI, staging, or production changes behavior.
Debugging Cache Stampedes
How to recognize and contain request spikes when cached data expires.
Debugging CORS Origin Bugs
A practical way to inspect origin parsing, credentials, and header behavior.
Debugging Retry Bugs
Retry issues often hide the first failure and create duplicate work.
Debugging Timezone Bugs
Time bugs usually live at day boundaries, DST changes, and unit conversions.
Debugging Pagination Bugs
Pagination bugs hide in boundary math, cursor reuse, and new records arriving between pages.
Structured investigations for the failure modes engineers meet in real systems.
Python Circular Import Error: Debugging the Dependency Cycle
A practical guide to diagnosing and fixing circular imports in Python, covering common causes, specific commands, and real-world scenarios.
Python GIL Debugging: When Threads Don't Really Run in Parallel
A practical guide to diagnosing performance problems caused by Python's Global Interpreter Lock (GIL) in multithreaded programs.
Python Memory Leak Profiling: Diagnosing Unbounded Growth in Production
A practical guide to identifying and fixing Python memory leaks using tracemalloc, objgraph, and heapy, with production-tested strategies.
Django ORM N+1 Query Debugging: Finding and Fixing Hidden Database Bloat
A hands-on guide to diagnosing and fixing N+1 query problems in Django ORM, with concrete tools and real server metrics.
Django Static Files Not Serving in Production
A practical debugging guide for when Django fails to serve static files (CSS, JS, images) in production, covering common misconfigurations and fixes.
Django Authentication Not Working: A Systematic Debugging Guide
Learn how to debug Django authentication failures — from session cookies to auth backends. Includes real-world incident with OAuth2.
Long-form thinking on debugging habits, observability, and the systems around the bug.
How to Debug a Regression: A Practical Walkthrough
A practical, step-by-step guide to finding and fixing regression bugs, with real-world examples and concrete commands you can run today.
The Cost of Not Reproducing Bugs: Why Local Debugging Saves Hours
Skipping local reproduction leads to wasted hours, broken deploys, and frustrated teams. Here's why it's non-negotiable and how to do it right.
Debugging an Unfamiliar Codebase: A Systematic Approach
A repeatable process for debugging code you didn't write — with specific techniques, tooling choices, and a war story from a production outage at 2 AM.
5 Questions to Ask Yourself Before Filing a Bug Report
A senior engineer's pre-flight checklist for bug reports — forged in the fire of a production incident that turned a 5-minute fix into a 3-hour hunt.
Binary Search for Bugs: Cutting Down Bisection Time with git bisect run
Automating git bisect with a script turns days of manual hunting into minutes. Here's how to build a reliable bisection harness for your codebase.
Reading a Call Stack: What Each Frame Actually Tells You
A call stack shows you the path your code took to crash. But most developers only look at the top frame. Here’s how to read the whole thing — including async traces, native frames, and minified code.