Building a startup is one challenge; scaling it is a whole different game. Dan Neciu, Staff Engineer at CareerOS, shares a practical, experience-driven story about growing a JavaScript app from zero to thousands of users in over two years. This talk dives into real technical hurdles they faced, solutions they applied, and lessons learned along the way. If you want honest insights on scaling JavaScript applications in the real world, this session is for you. #JavaScriptScaling #StartupJourney #DanNeciu #React #FrontendNation #FEN2025 Get ready for practical tips from the frontlines of scaling apps to meet real user demand. 💻 Read our blog: https://frontendnation.com/blog 🎟️ Sign up for Frontend Nation 2026 to stay updated: https://frontendnation.com/ 💜 Special thanks to all our event sponsors for 2025: Diamond Sponsors AG Grid: https://www.ag-grid.com/charts/?utm_source=frontend-nation&utm_medium=logo&utm_campaign=frontend-nation-sponsorship-2025 BitterBrains: https://bitterbrains.com/ Vue School: https://vueschool.io/ Certificates.dev: https://certificates.dev/ InstantDev: https://instantdev.io/ Platinum Sponsors Cypress: https://www.cypress.io/ Sentry: https://sentry.io/signup/?utm_source=event&utm_medium=sponsored-event&utm_campaign=general-fy26q2-evergreen&utm_content=signup-frontendnation2025-signup JavaScript Cert: https://certificates.dev/javascript Vue.js Cert: https://certificates.dev/vuejs/ Angular Cert: https://certificates.dev/angular React Cert: https://certificates.dev/react Nuxt Cert: https://certificates.dev/nuxt TypeScript Cert: https://certificates.dev/typescript Agorify: https://agorify.com/ Gold Sponsors Mastering Nuxt: https://masteringnuxt.com/ Mastering Pinia: https://masteringpinia.com/ LevelUp DX: https://levelupdx.com/