Blog

Notes on feature flags, releases, and engineering.

Feature Flag Anti-Patterns: 9 Mistakes Behind Real Outages

Nine feature flag anti-patterns behind real outages — Knight Capital's $460M loss, Slack's day-long cascade, Google Cloud's June 2025 crash. Each with a fix.
May 6, 2026 ·
- anti-patterns
- fundamentals
- incidents
Feature Flag Cleanup: A Playbook for Paying Down Flag Debt

73% of feature flags are never removed — one reused bit cost Knight Capital $460M. The four-step playbook to clean up flag debt safely.
April 27, 2026 ·
- cleanup
- debt
- fundamentals
Feature Flags vs Environment Variables: A Practical Guide

Env vars configure where the process runs; flags decide what each request sees. Decision rule, comparison table, and 4 production gotchas inside.
April 25, 2026 ·
- config
- fundamentals