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.
The Debugging Mindset: A Systematic Method for Finding Root Causes
A repeatable, hypothesis-driven approach to debugging that works for intermittent failures, performance regressions, and production incidents.
Analyzing a Core Dump: What to Do When Your Process Goes Silent
A core dump is your process's last scream. Here's how to make it talk.
Timeouts Every Engineer Gets Wrong (and How to Fix Them)
Most timeout bugs aren't logic errors — they're configuration failures. Here's how to stop treating timeouts as magic numbers and start engineering them deliberately.
Backpressure in Streaming Systems: When Your Pipeline Fights Back
Backpressure is the system's way of saying 'slow down.' Ignore it and you get OOM crashes, silent data loss, or cascading failures. Here's how to design for it.
Finding Memory Leaks Step by Step: A Systematic Approach
Memory leaks are the silent killers of long-running services. Here's a repeatable process to hunt them down, from heap dumps to production monitoring.