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    Full-Stack SaaS Application Builder

    1

    Full-Stack SaaS Application Builder Architect and implement full-stack SaaS applications with multi-tenancy, Stripe billing, and production-ready security.

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    Full-Stack SaaS Application Builder

    Full-Stack SaaS Application Builder

    Example session with this skill installed

    Build a B2B task management SaaS using Next.js, Tailwind, and PostgreSQL. I need multi-tenancy, a Stripe subscription flow with Basic/Pro tiers, and a dashboard for team tasks.

    • Read your context and instructions
    • Compiled the full-stack saas application

    I have designed the architecture for your B2B Task Management SaaS. The system uses a shared-database, isolated-schema approach for multi-tenancy and implements a robust Stripe webhook handler for subscription lifecycle management.

    SaaS Architecture and Implementation

    ComponentImplementation Detail
    FrontendNext.js 14 App Router, Tailwind CSS, Shadcn/UI components
    BackendNext.js Server Actions, Zod validation, Prisma ORM
    DatabasePostgreSQL with Organization and Member (RBAC) tables
    AuthNextAuth.js with Middleware-based tenant protection
    BillingStripe Integration (Basic/Pro tiers) with webhook idempotency
    // src/lib/stripe/webhook-handler.ts
import { stripe } from './config';
import { prisma } from '@/lib/db';

export async function handleSubscriptionChange(event: any) {
  const session = event.data.object;
  const orgId = session.metadata.orgId;

  const status = session.status; // trialing, active, past_due, canceled
  
  await prisma.organization.update({
    where: { id: orgId },
    data: { 
      subscriptionStatus: status,
      stripeCustomerId: session.customer,
      planTier: session.metadata.planTier 
    }
  });
}

    -- prisma/migrations/01_init_tenancy.sql
CREATE TABLE "Organization" (
    "id" TEXT PRIMARY KEY,
    "name" TEXT NOT NULL,
    "stripeCustomerId" TEXT UNIQUE,
    "subscriptionStatus" TEXT DEFAULT 'trialing'
);

CREATE TABLE "Task" (
    "id" TEXT PRIMARY KEY,
    "orgId" TEXT NOT NULL,
    "title" TEXT NOT NULL,
    "status" TEXT DEFAULT 'todo',
    FOREIGN KEY ("orgId") REFERENCES "Organization"("id")
);

CREATE INDEX "idx_task_org" ON "Task"("orgId");

    Next steps

    1. Copy the .env.example to .env and add your STRIPE_SECRET_KEY and DATABASE_URL.
    2. Run npx prisma migrate dev to initialize the multi-tenant schema.
    3. Start the local development server and navigate to /api/webhooks/stripe to test the billing flow.

    Connects securely to your tools. The creator never sees your data.

    About this skill

    Building a SaaS application involves managing dozens of moving parts, from tenant isolation and database migrations to complex subscription lifecycles. This skill eliminates the fragmentation of building features in isolation by acting as a Principal Architect to deliver a cohesive, production-ready system. It bridges the gap between a product brief and a maintainable repository by enforcing rigorous engineering standards across the entire stack.

    What it does

    • Architects systems by designing multi-tenant structures, data models, and API contracts based on your product brief.
    • Builds vertical slices including responsive frontends, secure backend services, and persistent database schemas.
    • Implements billing workflows for Stripe or other providers, handling webhooks, trials, and feature entitlements.
    • Enforces security through server-side authorization, role-based access control, and tenant boundaries.
    • Generates test suites covering unit, integration, and end-to-end scenarios for core user journeys.

    How it works

    1. Discovery: Provide your product requirements, target users, and preferred stack to generate a scope and assumptions register.
    2. Architecture: Review the proposed stack, database schema, and deployment topology tailored to your constraints.
    3. Implementation: The agent scaffolds the repository, writing migrations, components, and domain services.
    4. Validation: Run the included test pyramid and security checks to verify isolation and edge-case handling.

    Frameworks & tools

    Works with React, Next.js, Vue, Node.js, Python, FastAPI, and PostgreSQL. Integrates with Stripe for billing and various auth providers for session management.

    Why this beats prompting it yourself

    Generic prompts often result in disconnected code snippets and "happy path" logic that breaks in production. This skill follows a 12-phase delivery framework that ensures database migrations, billing webhooks, and tenant security are integrated, not just mentioned.

    Use cases

    • MVP Scaffolding: Rapidly move from an idea to a working codebase with auth and billing.
    • System Refactoring: Audit an existing stack to add tenant isolation and robust error handling.
    • Billing Integration: Implement complex subscription states like past_due, trialing, and proration logic.
    • Security Hardening: Enforce object-level authorization and audit logging across an entire API.

    Known limitations

    Does not perform live production deployments or execute destructive migrations without explicit permission. Billing logic requires a sandbox environment for validation.

    Requires manual environment variable setup. Does not perform live production deployments or execute destructive migrations. Payment validation requires provider sandbox credentials.

    How to use

    1. 1

      Connect your agent to the Agensi MCP

      Copy the prompt and paste it into Claude, ChatGPT, Cursor or any agent that supports MCP. It sets up the connection for you. Manual setup

    2. 2

      Sign in to Agensi

      Your agent shows a sign-in link. Sign in and click Allow.

    3. 3

      Ask for what you need

      Your agent loads this skill and uses it on your task. It always asks before any payment.

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    Listed7 days ago

    What's inside

    Frequently Asked Questions

    This skill handles the complex logic of multi-tenancy, Stripe subscription states, and production-grade security, ensuring your SaaS isn't just a UI but a scalable, secure business application.

    The skill supports modern full-stack frameworks including React, Next.js, and Vue for frontends, alongside Node.js, Python (FastAPI), and PostgreSQL for robust backend and data management.

    Yes, the agent is designed to audit existing codebases to implement missed security layers, such as role-based access control (RBAC) and tenant isolation, or to integrate complex billing lifecycles.

    You will receive the full AI agent skill configuration, the 12-phase delivery framework, and documentation on how to initialize the discovery and implementation process.

    The agent generates a comprehensive 'test pyramid' including unit, integration, and end-to-end tests to ensure that billing webhooks and tenant boundaries function correctly before you go live.

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