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Engineering notes on Rails, Ruby, AI and testing, and guides for founders who work with engineers.

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railsstartupengineering

Should You Let Them Build It in Rails?

You cannot judge a framework you cannot read, and comparing frameworks across ecosystems mostly produces noise. Here is what a non-technical founder can actually check when someone proposes Ruby on Rails.

· Paul Keen
foundersnon-technical-founderprototyping

Have an App Idea? Here's Where to Start

Turn your app idea into a clear concept and a small prototype. A practical guide for non-technical founders, with rough sketches and AI prompts you can copy.

· Paul Keen
aiagentsengineering

Autonomous Agent Teams Are Real. Measured Success Runs 13% to 59%.

Six multi-agent frameworks, measured across coding and reasoning benchmarks. Then the pattern both the loudest sceptic and the loudest proponent ended up agreeing on: many agents may think, one agent writes.

· Paul Keen
aiengineeringcode-review

"Generate Then Verify" Moved Your Work. It Didn't Remove It.

81% of engineering teams report spending more time in code review since adopting AI tools. The advice assumes checking is the cheap half. Measurement says that is where the hours went.

· Paul Keen
aicode-reviewstartup

Your AI Reviewer Approved It. Did It Read Its Own Report?

Our AI code reviewer found a SQL injection, described it accurately, and set the verdict to approve in the same response. Here is what we changed.

aistartupcode-review

Your Dev Shop Says the Code Was Reviewed. By What?

Copilot now takes part in more than one in five code reviews on GitHub. The research says AI reviewers earn their keep - and that the tuning which makes them usable suppressed about a fifth of real vulnerabilities on a standard benchmark.

· Paul Keen
testingqualityci

Your Link Checker Is Probably Checking Nothing

We planted eight defects in our own CI. Three were caught. One gate was skipping 133,874 of 149,516 links and reporting green. Here is the command that proves it.

· Paul Keen
aihiringstartup

What Senior Devs Catch That AI Misses

A change swapped a made-up number for a confident, wrong explanation of how Propshaft works. Spotting the difference is the thing you are actually hiring for.

· Paul Keen
contentaistartup

How to Audit Content You Didn't Write

A fake think tank published 100+ reports built to be repeated by chatbots, behind a $900,000 government contract. The same economics reached your blog. Four checks you can run.

· Paul Keen
rubyrailsai

What RubyLLM Retries, and For How Long

RubyLLM retries POSTs that Faraday would not, and honors Retry-After with no upper bound. A 429 can park a Rails request for as long as the provider says.

· JetThoughts Team

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JetThoughts has been building software since 2008. Book a call, or write to sales@jetthoughts.com. You'll leave the call with a written one-page scope within 2 working days.

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Paul KeenFounder

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