The Ultimate SaaS Tech Stack in 2025

Technology stacks are no longer about buzzwords — they’re about workflows. What helps you ship faster, scale easier, and iterate with confidence?

In this post, we’ll look at a lean, modern SaaS tech stack that balances speed, integration quality, and long-term maintainability.

• Frontend: Next.js 15 with the App Router, React 19, and full support for Server Components and layouts.
• Backend: Supabase for Postgres, edge functions, real-time APIs, and powerful SQL access.
• Styling: Tailwind CSS with dark mode support and design tokens powered by CSS variables.
• Authentication: Supabase Auth with social login, passwordless support, and SSR integration via @supabase/ssr.
• CMS: TinaCMS for editing content directly inside the app - fully integrated with markdown and JSON structures.
• UI Components: shadcn/ui + Lucide + headless primitives for accessibility and flexibility.
• State & Data: React 19 cache, SWR for API hooks, and local state via useState and useRef.
• Types: TypeScript with strict mode for type-safe DX.
• Hosting: Vercel for instant deploys, preview environments, and edge function support.

While the core setup is lean and opinionated, we also include optional tools to boost developer productivity:

• Lemon Squeezy – Subscription and licensing infrastructure for SaaS monetization.
• React Email – Transactional email templates powered by Tailwind CSS.
• Zod – Schema validation with strong TypeScript support.
• ESLint + Prettier + Husky – Consistent code formatting and pre-commit hooks.
• Playwright + Vitest – For integration and unit testing.

These are either built-in or easy to drop in when you scale beyond MVP.

This setup is battle-tested across real SaaS launches. It balances flexibility with structure: React’s latest features, a scalable backend, modern developer tools, and zero vendor lock-in.

If you're starting a new SaaS project in 2025, this stack can save you weeks of setup and help you scale with confidence.