# jujin.dev

> A development field guide: imagine outcomes, compare options, decide, then instruct AI.

Read project context first. Do not re-ask confirmed decisions. Ask about unresolved product and project-level choices unless their scope is delegated. Choose internal implementation and document formats within agreed requirements yourself. Ask when behavior, cost or operating constraints are missing or change. Cite evidence; report access failures.

## Start here
- [Latest development startup guidelines](https://jujin.dev/ai/startup/latest.md)
- [Guideline versions and startup prompt](https://jujin.dev/en/start/)
- [Behavior rules](https://jujin.dev/ai/instructions.md)
- [Versioned multilingual catalog and aliases](https://jujin.dev/ai/catalog.json)
- [Concept catalog](https://jujin.dev/en/catalog/)
- [Guides](https://jujin.dev/en/guides/)
- [Project integration guide](https://jujin.dev/en/ai/)

English originals with Korean and Japanese translations. The catalog links current project choices and guides with their available translations and stale-revision markers. HTML pages remain localized. All Markdown links point to English originals; legacy localized Markdown URLs serve the same English content. Users can write requests in their preferred language; reply in the user's language.

## Planning & architecture
- [Architecture: boundaries and responsibilities](https://jujin.dev/en/guides/architecture.md): Agree on module roles and ownership; let AI work out the internal code.
- [Requirements: agree on what done means](https://jujin.dev/en/guides/srs.md): Describe the behavior; AI writes requirements and decision records.

## Development platforms
- [Astro, Hugo, Jekyll: three ways to ship HTML](https://jujin.dev/en/guides/static-sites.md): Pick for authoring and maintenance, not a benchmark trophy.
- [Language, library, framework, engine](https://jujin.dev/en/guides/tools.md): Stop comparing tools that do different jobs.

## Deployment platforms
- [Delivery and operations: where it runs, how it recovers](https://jujin.dev/en/guides/shipping.md): Choose target devices and operating constraints; AI plans the release procedure.

## Design
- [Name the layout you are pointing at](https://jujin.dev/en/guides/layout.md): Header, sidebar, grid, dialog: give your feedback coordinates.
- [Themes and fonts without fifty shades of almost](https://jujin.dev/en/guides/theme.md): Use shared tokens so one decision stays one decision.

## Monetization
- [Payment channels, PG, and merchant of record](https://jujin.dev/en/guides/payments.md): A payment button is the beginning of the paperwork.
- [Subscription, one-time payment, or ads?](https://jujin.dev/en/guides/revenue.md): Match the bill to the value. The pricing page cannot rescue the product.

## Layout


## Typography


## Architecture boundaries & dependencies
- [Clean architecture](https://jujin.dev/en/catalog/clean-architecture.md): Point source dependencies toward policy.
- [Hexagonal architecture](https://jujin.dev/en/catalog/hexagonal-architecture.md): Keep application behavior behind technology-independent ports.
- [Layered architecture](https://jujin.dev/en/catalog/layered-architecture.md): Separate responsibilities with explicit dependency rules.

## Service decomposition
- [Microservices](https://jujin.dev/en/catalog/microservices.md): Release capability services independently.
- [Modular monolith](https://jujin.dev/en/catalog/modular-monolith.md): Keep module ownership inside one release unit.
- [Monolith](https://jujin.dev/en/catalog/monolith.md): Release the server application as one unit.

## Static site generators
- [Astro](https://jujin.dev/en/catalog/astro.md): Static pages with optional islands.
- [Hugo](https://jujin.dev/en/catalog/hugo.md): Content and templates become files.
- [Jekyll](https://jujin.dev/en/catalog/jekyll.md): Ruby builds; hosting serves files.

## Web UI development tools
- [React](https://jujin.dev/en/catalog/react.md): State changes drive rendered labels.
- [Svelte](https://jujin.dev/en/catalog/svelte.md): Compile components; update at runtime.
- [Vue](https://jujin.dev/en/catalog/vue.md): Reactive state updates templates.

## Game engines
- [Godot](https://jujin.dev/en/catalog/godot.md): Nodes compose reusable scenes.
- [Unity](https://jujin.dev/en/catalog/unity.md): Components supply object behavior.
- [Unreal Engine](https://jujin.dev/en/catalog/unreal-engine.md): Actors combine components and events.

## Hosting execution models
- [Always-on server](https://jujin.dev/en/catalog/always-on-server.md): Process lifetime differs from data lifetime.
- [Serverless functions](https://jujin.dev/en/catalog/serverless-functions.md): Invocations use external durable state.
- [Static hosting](https://jujin.dev/en/catalog/static-hosting.md): Public files and private writes separate.

## Column composition
- [Multiple columns](https://jujin.dev/en/catalog/multiple-columns.md): Compare the same six resources.
- [Single column](https://jujin.dev/en/catalog/single-column.md): Compare the same six resources.
- [Two columns](https://jujin.dev/en/catalog/two-columns.md): Compare the same six resources.

## Content arrangement
- [List layout](https://jujin.dev/en/catalog/list-layout.md): Compare the same six resources.
- [Masonry](https://jujin.dev/en/catalog/masonry.md): Compare the same six resources.
- [Uniform grid](https://jujin.dev/en/catalog/uniform-grid.md): Compare the same six resources.

## Styles
- [Brutalism](https://jujin.dev/en/catalog/brutalism.md): Explore the same project workspace.
- [Flat design](https://jujin.dev/en/catalog/flat-design.md): Explore the same project workspace.
- [Glassmorphism](https://jujin.dev/en/catalog/glassmorphism.md): Explore the same project workspace.
- [Liquid Glass](https://jujin.dev/en/catalog/liquid-glass.md): Explore the same project workspace.
- [Material 3 Expressive](https://jujin.dev/en/catalog/material-3-expressive.md): Explore the same project workspace.
- [Minimalism](https://jujin.dev/en/catalog/minimalism.md): Explore the same project workspace.
- [Neobrutalism](https://jujin.dev/en/catalog/neobrutalism.md): Explore the same project workspace.
- [Neumorphism](https://jujin.dev/en/catalog/neumorphism.md): Explore the same project workspace.
- [Retro digital](https://jujin.dev/en/catalog/retro-digital.md): Explore the same project workspace.
- [Skeuomorphism](https://jujin.dev/en/catalog/skeuomorphism.md): Explore the same project workspace.
- [Tactile collage](https://jujin.dev/en/catalog/tactile-collage.md): Explore the same project workspace.

## Typeface shapes
- [Sans serif](https://jujin.dev/en/catalog/sans-serif.md): Compare the same text specimen.
- [Script](https://jujin.dev/en/catalog/script.md): Compare the same text specimen.
- [Serif](https://jujin.dev/en/catalog/serif.md): Compare the same text specimen.

## Character width
- [Monospace](https://jujin.dev/en/catalog/monospace.md): Compare the same text specimen.
- [Proportional](https://jujin.dev/en/catalog/proportional.md): Compare the same text specimen.

## Revenue sources
- [Advertising](https://jujin.dev/en/catalog/advertising.md): Advertisers fund placements around content.
- [Affiliate commissions](https://jujin.dev/en/catalog/affiliate-marketing.md): Qualifying referrals can earn a commission.
- [Customer direct payment](https://jujin.dev/en/catalog/direct-payment.md): Customers fund access to the product.
- [Sponsorship](https://jujin.dev/en/catalog/sponsorship.md): Supporters fund continued public work.
- [Transaction fees](https://jujin.dev/en/catalog/transaction-fees.md): A platform takes a share of a mediated sale.

## Billing methods
- [One-time payment](https://jujin.dev/en/catalog/one-time-payment.md): One charge for a defined entitlement.
- [Prepaid credits](https://jujin.dev/en/catalog/prepaid-credits.md): Buy a balance before consuming units.
- [Subscription](https://jujin.dev/en/catalog/subscription.md): Recurring billing with explicit access policies.
- [Usage-based billing](https://jujin.dev/en/catalog/usage-based.md): Meter units, then calculate the charge.

## Seller responsibility models
- [Direct seller model](https://jujin.dev/en/catalog/direct-seller.md): The product business remains the seller.
- [Merchant of record model](https://jujin.dev/en/catalog/merchant-of-record.md): A contracted seller handles covered transactions.

## Pricing models
- [Base fee plus overage](https://jujin.dev/en/catalog/base-plus-overage.md): Pay a base, then only for excess usage.
- [Feature-tiered pricing](https://jujin.dev/en/catalog/feature-tiered-pricing.md): Packages differ by included capabilities.
- [Flat-rate pricing](https://jujin.dev/en/catalog/flat-rate-pricing.md): A fixed price for a defined package.
- [Graduated pricing](https://jujin.dev/en/catalog/graduated-pricing.md): Each slice keeps its own unit price.
- [Per-seat pricing](https://jujin.dev/en/catalog/per-seat-pricing.md): Charge for each licensed seat.
- [Volume pricing](https://jujin.dev/en/catalog/volume-pricing.md): The final quantity selects one rate for all units.

## Free access strategies
- [Free trial](https://jujin.dev/en/catalog/free-trial.md): Evaluate paid features for a limited period.
- [Freemium](https://jujin.dev/en/catalog/freemium.md): A lasting free tier with optional paid features.

## In-app purchase types
- [Consumable purchase](https://jujin.dev/en/catalog/consumable-purchase.md): Purchased units decrease when used.
- [Non-consumable purchase](https://jujin.dev/en/catalog/non-consumable-purchase.md): A purchased entitlement survives repeated use.

## Ad formats
- [Banner ads](https://jujin.dev/en/catalog/banner-ads.md): A labeled ad region beside the main content.
- [Interstitial ads](https://jujin.dev/en/catalog/interstitial-ads.md): A full-screen ad at a natural transition.
- [Rewarded ads](https://jujin.dev/en/catalog/rewarded-ads.md): Optional participation with a stated completion reward.

Publishing these resources does not guarantee external AI compliance. Explicitly request reading and application.