Cron expressions that fire when you expect
The five fields are simple; the surprises are not. Step values anchored to the field, the day-of-month OR day-of-week rule, time zones, and why "every five hours" is not what */5 means.
· 6 min read
Guides
Longer pieces on the problems these tools sit next to — the reasoning a tool page cannot hold without getting in the way of the tool.
Planning VPC address space you will not regret
Subnetting is easy arithmetic and hard planning. How to size a VPC, why AWS takes five addresses per subnet, and the allocation habits that keep the next environment from needing a migration.
· 8 min read
Reading a JWT without trusting it
A JWT is signed, not encrypted — anyone holding one can read it. Here is what the three segments actually contain, why decoding is not verifying, and the four checks a verifier has to make.
· 7 min read