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Design OS Opus Composer

The Builder Method

The Builder Method is the process-oriented framework that guides everything in Builder Methods Pro—from design through build to refinement. This video establishes the mental model for working productively with AI while keeping your creativity and craft at the center.

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Pro

Claude Opus 4.5 vs. Google Gemini 3: Design & build an app

Let's compare Claude Opus 4.5 and Google Gemini 3 to see how they stack up when it comes to planning, designing frontend and backend for a new app! Plus how I evaluate new frontier models when they drop...

New

Design OS: First look!

The very first look at Design OS—a new free tool and process (coming soon) aimed at rethinking the design and planning process for new products.

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Pro

Cursor 2.0 Changed How I Work

Cursor 2.0 dropped last week, and unlike most recent AI updates, it's actually changed how I work. Two features in particular: Cursor's new Composer model that's 10-50x faster than any other coding model, and parallel agents that finally make running multiple autonomous builds practical. I'll show you Composer building and...

New

Building a PDF Invoice Generator using Cursor 2.0 & Composer

In this video, I show how to build a fully automated PDF invoice system in Rails—from Stripe test data to downloadable invoices—using Cursor 2.0 and their new Composer model.

Pro

Training & community for pro software developers building with AI.

Created by Brian Casel (that's me). I'm a career software developer, founder, and creator of Builder Methods and Agent OS, the system for spec-driven development with AI.

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