Some of your throwaway code is going to become permanent, and Noah Silvera thinks that can be fine. What decides whether it ever gets replaced is naming. Code nobody can follow does not get rewritten. It sits there because everyone is too scared to touch it.

"Some bottlenecks just can't be widened no matter what Sam Altman says." Noah Silvera did hand an AI agent a feature on deadline and it worked. It came back messy but correct enough to ship. She credits knowing the requirements well enough to write precise verification criteria.

"It will not matter if you deliver something if you deliver the wrong thing." Noah Silvera does the arithmetic. Skipping the research saves half a day. Fixing the same problem in production costs a day and a half. The client waits longer for what they actually needed.

Your product manager is relaying what another team told them, and so was that team. Noah Silvera calls it the line of telephone. Taking a requirement at face value means trusting all of it. She argues engineers own the outcome either way, so the floor is asking the client why.

Some iteration happens outside the codebase. Noah Silvera has spent six years at Super Good Software on clients who want everything fast and right the first time. She argues the cheapest way to avoid building the wrong thing is negotiating requirements before opening the editor.

Your production server is slow and nobody can tell you why. Charles Nutter attaches a tool to a running process and watches where the time goes, at one or two percent overhead. That tooling is a big reason JRuby users stay and comes from thousands of engineers improving the JVM.

"Some of them tell me they've been running JRuby for 15 years, and I never heard a word about it." Charles Nutter meets new JRuby users at every conference he attends. He funds the project himself now through Headius Enterprises, and those users are the reason it still ships.

"The top three complaints about JRuby are all startup time, basically." Charles Nutter thinks JRuby would be close to standard in Ruby shops today if that had been solved a decade ago. He also explains why the fix was never his to make and what the OpenJDK team changed recently.

It cost $50 to get in and 60 people showed up. Charles Nutter was a Java architect on government contracts when he sat in on that DC Ruby conference and understood every slide without ever writing Ruby. He went looking for a way to use it at work and found JRuby idle since 2001.

People hear "Ruby on the JVM" and immediately picture themselves writing Java. Charles Nutter has spent 20 years saying otherwise. JRuby is a full Ruby implementation, and a Rails or Hanami app comes straight over to run on better garbage collection and real parallel threads.