Skill · AI & Development

Full-Stack SaaS Builder & Architect

Full-Stack SaaS Builder & Architect is a Claude skill for AI & Development. Design production-grade SaaS architecture, schemas, and auth. It costs $12.99 on Agensi. It runs on any paid Claude plan. Part of the StrategistKit catalog of 190+ focused Claude skills.

Category: AI & Development
Deliverable: 1 .skill bundle
Outputs: —
Last updated: 13 Jun 2026

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Overview

What Full-Stack SaaS Builder & Architect does.

Tell the skill your stack, scale target, and non-negotiables — it works through ten architectural layers in a single session: data model and schema, RBAC and multi-tenancy strategy, REST or GraphQL API contract, frontend component structure, billing integration pattern, background job design, security posture, and performance baseline. Each layer is calibrated to what you actually specified, not a generic template. The session closes with an Architecture Decision Record, an annotated schema, an API spec skeleton, and a launch-day checklist you can hand to any developer on your team.

A realistic prompt looks like: 'B2B project-management tool, Next.js and Supabase, team-level RBAC, Stripe subscriptions with per-seat pricing, target 500 teams at launch, two-person founding team.' The skill surfaces the decisions that constrain you long-term — schema-level tenant isolation vs. row-level security, webhook idempotency keys, token refresh strategy — before they become expensive retrofits.

A sample output excerpt: ADR-001 — Tenant Isolation Strategy: Decision: row-level security via Supabase RLS policies on all tenant-scoped tables. Rationale: avoids schema-per-tenant migration complexity at sub-1,000-tenant scale; revisit at 10k tenants. Trade-offs: RLS policy drift risk — mitigated by policy unit tests in CI. Schema note: organisations.id as UUID FK on every user-facing table; no cross-tenant joins permitted at ORM layer. Billing note: Stripe Customer ID stored on organisations, not users — prevents duplicate subscription events on seat changes.

Who it's for

Solo founders and small engineering teams starting a SaaS build who need senior-architect-level structural decisions without a senior architect on payroll — and any technical lead who wants a structured second opinion on data model, auth, and API choices before the codebase locks them in.

How it works

Three steps. About two minutes.

Install

Add the .skill file to your Claude app. About 10 seconds.

Run it on your work

Invoke the skill and paste in your material.

Apply the output

Review, keep what works, and use it.

In depth

Why a Claude skill beats a prompt template.

A copy-paste prompt runs one static pass and stops. A skill is a bundled program — instructions, examples, and a workflow Claude runs as a unit: it asks for the right input, applies the same pattern every time, and returns the structured outputs above.

FAQ

Common questions.

What formats does the skill actually return?

It returns four structured artifacts: an Architecture Decision Record, an annotated data model, an API spec skeleton, and a launch-day deployment checklist. Format adapts to your request — you can ask for a copy-paste schema, a decision document, or a developer-ready checklist.

Do I have to specify a particular stack, or does it work with any?

You specify your stack at runtime — the skill adapts to whatever you bring. Common combinations like Next.js with Supabase, or a Node API with PostgreSQL, are handled well, but the architectural reasoning applies to any stack you describe.

What input does the skill need to give useful output?

At minimum: your tech stack, a rough scale target (e.g. expected users or tenants at launch), and your must-have features (multi-tenancy, billing, specific auth requirements). The more constraints you supply, the more specific the ADR and checklist become. You can say 'decide for me' and it proceeds with reasoned defaults.

Will this tell me what to build, or how to build it?

It focuses on how to build it structurally — the decisions that affect every line of code written after day one. It does not write production code, but the API spec skeleton and schema annotations are close enough to copy into a migration file or OpenAPI document.

Is this useful if I already have a partial architecture?

Yes. Describe what you have and what decisions are still open. The skill will audit the existing choices, flag risks (schema issues, missing idempotency, RBAC gaps), and fill in the gaps rather than starting from scratch.