Build Once, Launch Ten Times: The Rails Engine SaaS Strategy
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Solo developers building multiple SaaS products waste time re-implementing the same boilerplate (auth, billing, multi-tenancy, UI) for each new project. Using a mountable Rails Engine as a shared 'SaaS Core' gem solves this: build authentication, Stripe billing, team models, and ViewComponent UI once, then mount the engine into any new project. Local development uses Gemfile's `path:` option for instant feedback. Bugs fixed in the engine propagate to all projects via `bundle update`, and new ideas launch with a professional foundation in minutes rather than days.
Table of contents
What is a Rails Engine?STEP 1: Generate the EngineSTEP 2: Add the “Boring” SaaS LogicSTEP 3: Shared UI (The Design System)STEP 4: The Local Development WorkflowWhy this is the ultimate Solopreneur hackSummary62 Impressions