Software Needs to Be Operated Decades Longer Than You Write It

>In a declarative system, you express what you want the system to do. You don't tell the system how it should do those things.

This is a well solved problem.

Spreadsheets are the worlds most popular programming environment. They implement purely functional declarative programming systems that can easily span decades.

Easy to comprehend, easy to debug, for the most part.

Only if you're lucky. Most software dies or gets completely rewritten within just a few years as languages, trends, and operational realities (SSL/TLS/security updates) wash over the digital landscape.

Inspired by a recent tweet from Werner Vogels this blog explores what it takes to have our software operated for decades after we write it.

And the data is often immortal