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.
Null Pointer from Kotlin Platform Types in Java Interop
A guide to debugging NullPointerException from platform types when calling Java code from Kotlin. Covers root causes, diagnosis, and fixes.
Android ANR (Application Not Responding) Debugging: From Input Dispatch to Watchdog Timeouts
A field guide for Android engineers on diagnosing and fixing Application Not Responding (ANR) errors, covering input dispatch, broadcast receivers, and service timeouts.
Debugging Excessive Recomposition in Jetpack Compose
A deep dive into identifying and fixing unnecessary recompositions in Jetpack Compose, covering state hoisting, stable types, and common anti-patterns.
Swift Retain Cycles in Closures: How to Find and Fix Them
A guide to diagnosing, fixing, and preventing retain cycles caused by closures in Swift, with real-world debugging steps and a detailed incident story.
SwiftUI View Not Updating When State Changes: A Field Guide
Your SwiftUI view stays stuck even though @State or @Published values change. This guide covers the real reasons—wrong view identity, unnecessary equatable conformance, and publishers on background queues—and how to fix them.
Swift Actor Data Race Concurrency Debugging: Real-World Race Conditions in Actors
A practical guide to debugging data races in Swift actors, covering reentrancy, priority inversion, and actor-isolated state corruption with real crash logs and diagnostic steps.
Long-form thinking on debugging habits, observability, and the systems around the bug.
Debugging Webhook Delivery Failures: What the Logs Don't Tell You
HTTP 200 doesn't mean your webhook was processed. A practical guide to the network and middleware layers that silently drop webhooks.
Debugging HTTP Headers with curl: From Basic Flags to Packet-Level Inspection
A practical guide to inspecting HTTP request and response headers with curl, covering basic flags, debugging tricky issues, and understanding what your headers are really doing.
Debugging WebSocket Real-Time Features: Packet Loss, Reconnect Storms, and Silent Failures
WebSocket debugging goes beyond console.log. I cover packet capture with tcpdump, reconnect backoff strategies, and a war story about a silent failure that took down a production chat feature.
Rest API Design Mistakes That Inject Bugs Into Your System
Most API bugs aren't in the implementation—they're baked into the contract. Here are the design errors I've seen cause the most production incidents.
Blameless Postmortems: How We Fixed Root Causes Without Firing Anyone
A practical guide to running postmortems that focus on systemic failures, not individual mistakes. Includes a real incident breakdown from a production database outage.
Chaos Engineering at 3 AM: When Our Kubernetes Cluster Lost Its DNS
We ran a chaos experiment on our Kubernetes cluster and found a subtle DNS misconfiguration that would have caused a cascading failure. Here's how we did it and what we learned.