We measured first, and the bottleneck was not where anyone expected. Tests are documentation that fails loudly when it goes stale. Naming things well saved us more time than any framework migration.
Getting started
Every retry needs a budget, otherwise it is just a slower outage. Tests are documentation that fails loudly when it goes stale. Feature flags are debt with an expiration date you must actually enforce.
The fastest query is the one you never send, but the second fastest has a good index. Feature flags are debt with an expiration date you must actually enforce.
The short version
The fastest query is the one you never send, but the second fastest has a good index. Caches are easy to add and surprisingly hard to remove. Tests are documentation that fails loudly when it goes stale.
- Measure p95 and p99, not just the mean
- Write the failure mode down before writing code
- Keep migrations reversible
- Delete dead code the same week
Latency percentiles tell a story that averages politely hide. The rollback plan should exist before the rollout plan is approved.
What worked
The fastest query is the one you never send, but the second fastest has a good index. Our on-call rotation improved the day we deleted half of the alerts. Caches are easy to add and surprisingly hard to remove. We measured first, and the bottleneck was not where anyone expected.
If the error message does not say what to do next, it is half an error message.
Feature flags are debt with an expiration date you must actually enforce. The rollback plan should exist before the rollout plan is approved.
Security is mostly about saying no to defaults that were convenient in 2010. Naming things well saved us more time than any framework migration.
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