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.
Fixing TypeScript Project References Build Errors
A practical guide to diagnosing and resolving build errors in TypeScript project references, covering configuration mismatches, circular dependencies, and composite project issues.
Debugging TypeScript Enums: Unexpected Runtime Behavior with Reverse Mappings
A concrete guide to debugging TypeScript enum reverse mappings, numeric vs string enum pitfalls, and runtime surprises that look like bugs but aren't.
Debugging PostgreSQL Deadlocks: From Detection to Fix
A practical guide to identifying, diagnosing, and resolving PostgreSQL deadlocks with real-world examples and specific commands.
Postgres Index Not Being Used by Query Planner
A practical guide to diagnosing why PostgreSQL's query planner ignores an index and how to force it when appropriate.
Row Lock Contention with SELECT FOR UPDATE in PostgreSQL
A deep guide to diagnosing and fixing row lock contention caused by SELECT FOR UPDATE queries in PostgreSQL, including queue buildup, deadlocks, and performance degradation.
PostgreSQL Connection Pool Exhaustion: Debugging When All Connections Are Taken
A practical guide to diagnosing and fixing Postgres connection pool exhaustion with real-world commands and patterns.
Long-form thinking on debugging habits, observability, and the systems around the bug.
Logs, Traces, and the Lies They Tell: Debugging a Stuck Queue in Production
A single stuck queue brought down an entire checkout flow. Here's how we traced the failure across services, what the logs didn't say, and the tools that finally showed the truth.
Pair Debugging: How to Debug Together Without Killing Each Other
Pair debugging sounds great on paper. In practice, it's easy to step on each other's toes, go silent, or fight over the keyboard. Here's how to make it work.
Debugging with AI Tools: What Worked and What Didn't in Production
After a year of using GPT-4, Copilot, and Claude to hunt production bugs, here's what actually helped — and what sent me down dead ends.
How to Debug Legacy Code Without Losing Your Mind
A pragmatic approach to debugging code you didn't write, with techniques for tracing execution, isolating side effects, and making safe edits.
Debugging Feature Flag Rollouts: Tracing the Live-at-5 Incident
A misconfigured feature flag triggered a cascading failure in production. Here's how we traced the root cause and built a better debugging toolkit.
How to Ask for Debugging Help Without Wasting Everyone's Time
Asking for debugging help is a skill. Here's how to provide enough context, show your work, and frame the problem so others can actually help you.