# Scaling a Javascript Application from 0 to a Brazilian users
summary
Builds CareerOS from MVP to adoption by 50+ universities, raises $800k after four initial paying customers, and ships with React, Vite, TanStack, Firebase and many third‑party libs. Enforces modular, DDD-style modules and wraps external tools with facade wrappers so libraries can be swapped. Fixes a dev-mode CSS injection bug that trims 200KB of bundle, implements route-splitting plus a service-worker versioning strategy to avoid broken dynamic imports, and adds CI/CD, Storybook and weekly bug‑squash sprints.
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chapters (15)
- 0:00From senior to co-founder
- 3:52Validating ideas
- 7:27Choosing the right stack
- 10:40Wrapping third-party libs
- 13:51Building component library
- 14:33Fixing hot reload slowdown
- 16:42Cache busting in React
- 19:14Fixing buggy app with policy
- 20:39Automating releases with GitHub Actions
- 21:44Onboarding with Cursor and PR templates
- 22:49Scaling to 50 universities
- 24:56Scaling advice for juniors
- 26:00Internationalization with AI
- 27:24Balancing performance, UX, security
- 29:13Closing and Q&A
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