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By oborchers
Review and build SaaS UIs following 12 research-backed design principles — accessibility, auth flows, data tables, forms, navigation, permissions, error states, performance patterns, theming, notifications, onboarding, and responsive layouts — with actionable code audits and fix suggestions
npx claudepluginhub oborchers/fractional-cto --plugin saas-design-principlesThis skill should be used when the user is building or reviewing accessibility (a11y), WCAG 2.2 AA compliance, keyboard navigation, focus management, screen reader support, ARIA attributes, color contrast, or SPA accessibility. Covers legal requirements, accessible component primitives, and the unique focus challenges of single-page applications.
This skill should be used when the user is building or reviewing login flows, magic links, SSO (SAML/OIDC), multi-factor authentication (MFA), OTP input fields, password reset, or session management. Covers the modern auth stack hierarchy, MFA fatigue prevention, session expiry UX, and GDPR compliance for authentication.
This skill should be used when the user is building or reviewing data tables, pagination, column alignment, bulk actions, sorting, filtering, row selection, or table-to-card responsive patterns. Covers the pagination vs infinite scroll decision, DataTable vs IndexTable patterns, and column default strategy.
This skill should be used when the user is building or reviewing theming systems, design tokens, dark mode implementation, CSS custom properties, color naming conventions, or theme switching architecture. Covers the three-tier token model (primitive/semantic/component), purpose-based naming, and the DTCG specification.
This skill should be used when the user is building or reviewing error states, validation errors, permission errors (403), session expiry warnings, offline handling, concurrent edit conflicts, rate limiting, or server error (500) recovery flows. Covers the full taxonomy of SaaS failure modes and graceful degradation patterns.
Uses power tools
Uses Bash, Write, or Edit tools
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Sign in to claimBased on adoption, maintenance, documentation, and repository signals. Not a security audit or endorsement.
Use this agent when creating user interfaces, designing components, building design systems, or improving visual aesthetics. This agent specializes in creating beautiful, functional interfaces that can be implemented quickly within 6-day sprints. Examples:\n\n<example>\nContext: Starting a new app or feature design
SaaS Builder Guide - Build production-ready SaaS from design to deployment with 11 skill guides, 5 AI agents, and beginner-friendly FAQ
SaaS business metrics and marketing analytics. CAC, LTV, MRR/ARR analysis, conversion funnels, ad spend optimization, and unit economics modeling.
59 expert skills for non-technical founders building SaaS with AI tools. Covers the full lifecycle: planning, design, build, database, integrations, AI features, security, testing, debugging, deployment, monitoring, plus marketing, pricing, growth, and business strategy.
Comprehensive UI/UX design plugin for mobile (iOS, Android, React Native) and web applications with design systems, accessibility, and modern patterns
UI/UX design intelligence. 107 styles, 127 palettes, 107 font pairings, 106 charts, 131 reasoning rules, 129 UX guidelines, 16 stacks (React, Next.js, Vue, Nuxt.js, Svelte, Astro, Angular, Remix, SolidJS, SwiftUI, React Native, Flutter, Tailwind, shadcn/ui, Jetpack Compose, Nuxt UI). 8 Python scripts: BM25 search, contrast checker, palette generator, token generator, type scale calculator, design system generator, UI auditor, CLI. Actions: plan, build, create, design, implement, review, fix, improve, optimize, enhance, refactor, check UI/UX code. Projects: website, landing page, dashboard, admin panel, e-commerce, SaaS, portfolio, blog, mobile app. Styles: glassmorphism, claymorphism, minimalism, brutalism, neumorphism, bento grid, dark mode, liquid glass, cyberpunk, spatial UI, data brutalism. Topics: color palette, accessibility, animation, layout, typography, font pairing, spacing, hover, shadow, gradient, design tokens, contrast checker.
Research-backed best practices for building modern, production-grade Python packages — project structure, pyproject.toml, typing, testing, CI/CD, documentation, versioning, API design, packaging, security, and developer experience
Transforms Claude Code conversation transcripts into polished, first-person blog posts through an interactive 5-stage pipeline — parse, triage, outline, draft, polish — with human editorial gates at every stage
Structured thinking methods that counteract LLM reasoning biases during problem exploration — first principles, inversion, constraint manipulation, perspective forcing, analogy search, and more, with user-gated parallel subagent exploration for deep dives
Zero-tolerance code pedantry — naming precision, casing law, structural symmetry, import discipline, and the obsessive details that separate clean code from correct code
Research-backed, opinionated guidance for designing world-class RESTful APIs — routes, naming, errors, auth, caching, webhooks, and more, distilled from Stripe, GitHub, Twilio, Shopify, Google, and Microsoft
No model invocation
Executes directly as bash, bypassing the AI model
No model invocation
Executes directly as bash, bypassing the AI model
Share bugs, ideas, or general feedback.
93 skills, 15 commands, and 16 agents across 11 plugins. Opinionated, research-backed Claude Code plugins for building SaaS products that ship.

Designed for Claude Code and Cowork. Skills compatible with other AI assistants.
Building a form? Skills activate automatically.
Need an API review? /api-review
Auditing code quality? /pedantic-review
Researching a topic? /research "your question"
Stress-testing a plan? /stress-test path/to/plan.md
Compressing your CLAUDE.md? /compress path/to/file.md
If this project helps you, star the repo.
Generic AI gives you suggestions. fractional-cto gives you standards.
Each skill encodes a proven engineering principle (naming precision, API design patterns, cloud governance) and enforces it the moment Claude detects relevant work. You get the rigor of Stripe's API design, Nielsen Norman's usability research, and production cloud architecture baked into every session. No bookshelf required.
The skills are deliberately opinionated. They don't present five options and ask you to choose. They tell you what to do, cite why, and show you the code. If you disagree, edit the skill. It's just markdown.
Every plugin activates the moment your Claude session starts. A session hook fires, reads the plugin's skill index, and injects it into context. From that point on, Claude knows what principles exist and when to apply them.

Each plugin carries review checklists, good/bad pattern comparisons, working code examples, and a dedicated reviewer agent for deeper audits.
# Step 1: Add the marketplace
/plugin marketplace add oborchers/fractional-cto
# Step 2: Install individual plugins
/plugin install saas-design-principles@fractional-cto
/plugin install visual-design-principles@fractional-cto
/plugin install api-design-principles@fractional-cto
/plugin install cloud-foundation-principles@fractional-cto
/plugin install pedantic-coder@fractional-cto
/plugin install python-package@fractional-cto
/plugin install deep-research@fractional-cto
/plugin install structured-brainstorming@fractional-cto
/plugin install retell@fractional-cto
/plugin install stress-test@fractional-cto
/plugin install markdown-compressor@fractional-cto
The skills/*/SKILL.md files follow the universal skill format and work with any tool that reads it. Commands and agents are Claude-specific.
| Tool | How to use | What works |
|---|---|---|
| Gemini CLI | Copy skill folders to .gemini/skills/ | Skills only |
| OpenCode | Copy skill folders to .opencode/skills/ | Skills only |
| Cursor | Copy skill folders to .cursor/skills/ | Skills only |
| Codex CLI | Copy skill folders to .codex/skills/ | Skills only |
| Kiro | Copy skill folders to .kiro/skills/ | Skills only |
# Example: copy all skills for Gemini CLI (project-level)
for plugin in */; do
[ -d "$plugin/skills" ] && cp -r "$plugin/skills/"* .gemini/skills/ 2>/dev/null
done
claude --plugin-dir /path/to/fractional-cto/<plugin-name>
Research-backed SaaS design principles drawn from Linear, Stripe, Shopify Polaris, and Nielsen Norman Group research.
Skills (13):