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.
18 playbooks · 509 guides · 96 articles · 13 linked practice labs ·skip to practice
Fast pattern recognition for the production failures engineers see most often.
18 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.
Debugging Cumulative Layout Shift (CLS): From Symptoms to Root Cause
A practical guide to diagnosing and fixing CLS issues in web performance, covering real-world causes, tools, and verification.
LCP Slow: How to Diagnose and Fix Largest Contentful Paint Issues
A practical guide to diagnosing and fixing slow Largest Contentful Paint (LCP) in production web apps.
Intersection Observer Callback Not Firing: Debugging Silent Failures
A practical guide to diagnosing why your IntersectionObserver callback never fires — covering root causes from thresholds to root margins, with real debugging commands and war stories.
Service Worker Serving Stale Cache: Diagnose and Fix
A guide to debugging when a service worker returns stale cached responses instead of fresh data from the network.
SAML SSO Login Fails After IdP Metadata Update
A complete debugging guide for SAML SSO login failures, covering certificate rotation, assertion validation, and clock skew issues.
OpenID Connect ID Token Validation Failure Debugging
A practical guide to diagnosing and fixing OpenID Connect ID token validation failures, covering signature verification, expiration, issuer mismatch, and audience checks.
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.
Spacemail Is Down: What the August 2026 Outage Teaches About Provider Failures
A concise status snapshot of the current Spacemail incident, followed by a practical engineering guide to provider-wide outages, regional failover, degraded modes, and safe recovery.