Open-Source SaaS Boilerplate

Skip the infrastructure. Ship your features.

A production-ready monorepo with auth, multi-tenant, RBAC, and an integrated AI team. Build your SaaS in minutes, not months.

< 5 min

to first feature

Zero config

clone and dev

Day one

production-ready

Everything you need to ship

From authentication to AI-powered development, all the infrastructure is handled so you can focus on your business.

Full-Stack TypeScript

TanStack Start frontend with NestJS + Fastify backend, all in a single monorepo powered by TurboRepo.

Auth & Users

Better Auth with email/password, OAuth providers, and session management. Ready out of the box.

Multi-Tenant

Row-Level Security on PostgreSQL. Organization hierarchy with complete tenant isolation.

Roles & Permissions

Fine-grained RBAC with roles and permissions. Control access at every level of your application.

End-to-End Type Safety

Shared types across frontend and backend. Strict TypeScript everywhere, catch bugs before they ship.

Monorepo Architecture

TurboRepo with shared packages for UI, config, and types. One codebase, maximum reuse.

Internationalization

Paraglide JS for compile-time i18n. Type-safe translations with zero runtime overhead.

AI-Powered Dev

Integrated AI team with Claude Code. Specs, reviews, and implementation — all AI-assisted.

Your AI development team

Two categories of AI agents work alongside you to build and operate your SaaS.

Development Agents

Help build your SaaS

Dev

Feature implementation

Review

Code review & quality

Test

Tests & coverage

Deploy

CI/CD & deployments

Product

Specs & ownership

Ops

Monitoring & infra

Frontend

UI/UX specialist

Backend

API & database specialist

Runtime Agents

Interact with your deployed product

Domain

Business automation

Personas

Test user flows

Integration

External services

Universal CLI generated from OpenAPI specs — any AI or human can interact with your API.

Developer experience first

Strong conventions and strict quality gates so you can move fast with confidence.

Strict TDD

Tests before code, always. Vitest for unit & integration, Playwright for E2E.

Quality Gates

Lint, types, tests, coverage, and review — all required before merge.

Docs as Code

MDX documentation in the repo. API docs auto-generated from OpenAPI.

Modern Tooling

Biome for linting & formatting. Bun for blazing-fast builds.

Built with modern tech

Frontend

React 19TanStack StartTanStack RouterTailwind CSS 4Radix UIParaglide JS

Backend

NestJSFastifyDrizzle ORMPostgreSQLBetter Auth

Tooling

BunTurboRepoBiomeVitestPlaywrightGitHub Actions

0+

Built-in Features

0%

Type Safe

0+

UI Components

0

Integrations

Ready to build?

Clone the repo and ship your first feature in under 5 minutes.

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