Arcetec SaaS Portfolio — Ten applications upgraded to React 19 and PostgreSQL 18

The challenge

Ten production applications shared an aging stack: React 18, Tailwind 3, Vite 5, PostgreSQL 16 and a version of Drizzle with a high-severity SQL injection advisory.

The solution

A common recipe was written with a baseline measured before and after, tested in a pilot and applied to all 10 applications: React 19, Tailwind 4, Vite 7, Drizzle 0.45, TypeScript 5.9, Node 24 and PostgreSQL 18. The pilot finished with 0 TypeScript errors, 949 tests and 109 end-to-end tests passing, without stopping operations.

Technologies used

• React
• PostgreSQL
• Vite
• Tailwind CSS
• Drizzle ORM
• TypeScript

Results

• 10 Applications upgraded
• 949 Passing tests — In the pilot
• 109 End-to-end tests — Without a single failure