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Engineering notes on Rails, Ruby, AI and testing, and guides for founders who work with engineers.
A framework for comparing a fractional CTO with a full-time hire: which costs to count, how to model break-even with your own numbers, and when each model fits.
· Paul KeenThe invoice is the visible cost of a dev-shop project. The hidden ledger - your hours, the stalled launch, paying twice - is what breaks budgets. A four-phase fix.
Is Rails still a safe bet? What Rails 8 ships, how long each version gets security fixes, what Shopify says about running a huge Rails monolith, and the questions to ask before agreeing to a rewrite.

Build image diffusion models: Suhail Doshi (Playground) shares AI image generation strategies, text accuracy techniques, prompt engineering. Create graphic design tools for startups ✓

Technical skills get you hired. Mindset shapes how you learn and grow after that. Five mindset shifts for developers, with habits and an eight-week plan to practice them.
· Paul Keen
Starting a new business is no small feat, and having a solid plan can make all the difference.

Most early-stage failures come from misalignment rather than technology. How to build a single source of truth the whole team actually uses.

Marketplace jobs are really shaking things up in 2025. They're not like your typical 9-to-5 gigs.
Five signs a founder can spot without reading code: slow simple changes, no-go zones, endless technical meetings, rewrite talk, and a team that stops committing to dates.
· Paul Keen
What a fractional CTO and a full-time CTO each give a startup, what a full-time hire costs according to BLS data, and the questions that decide between them.
· Paul KeenJetThoughts 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.

A 30-minute call; pick a time.