When someone cancels a SaaS subscription and vibe-codes a replacement, they're rebuilding the demo — not the platform. The fifteen CleenUI modules map out what the gap actually contains.
Read →Vertical-slice modules were the right organizational unit before AI coding tools existed. In 2026 they are also the right context unit — 18 worked examples of how a feature should be built, from UI to database, that agents can pattern-match against.
Read →A vertical-slice module is not a folder of related files. It is a complete system unit from UI to database. Understanding what that means in practice explains why AI tools generate more coherently into a modular codebase than into a flat one.
Read →M01–M20 are not stubs. Each module runs the full stack — UI to stored procedure. Here is what a vertical slice actually contains and why it matters for the first sprint.
Read →CleenUI ships 20 production-ready vertical-slice modules — M01 Security through M20 Contracts & E-Signature. Here is what each one covers and why the modular monolith shape matters more than the count.
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