Notes on Idempotency
The property that makes retries safe is also the property that makes systems boring in the best way — and boring is the goal.
Architecture
3 posts.
A Static Blog for a Dollar a Month
S3, CloudFront and nothing else. Here is the exact stack, the parts that are easy to get wrong, and the bill to prove it is actually cheap.
A Small Caching Layer for a Slow API
One upstream call was taking 900ms and getting hit on every page load. Forty lines of cache took p95 latency from 910ms to 4ms.