# jujin.dev

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

Read project context first. Do not re-ask confirmed decisions. Before explicit scoped delegation, ask about every unresolved choice, even with a strong recommendation. Cite evidence; report access failures.

## Start here
- [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 every published translation and marks stale revisions. Drafts are excluded. A missing translation is not an English duplicate at a translated URL.

## Planning & architecture
- [Design decisions that leave a paper trail](https://jujin.dev/en/guides/adr.md): Record why a choice won, and when it should stop winning.
- [Architecture without acronym worship](https://jujin.dev/en/guides/architecture.md): Use SOLID and GRASP to reason about change, not to win acronym bingo.
- [OOAD: give each object a job](https://jujin.dev/en/guides/ooad.md): Model behavior and ownership before drawing a forest of classes.
- [SRS: make ‘done’ mean something](https://jujin.dev/en/guides/srs.md): Turn a wish into requirements someone can actually test.

## Data structures
- [Array, list, map, set: pick by operation](https://jujin.dev/en/guides/collections.md): Order, lookup, and uniqueness are different jobs.

## 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
- [Runtime, distribution, hosting: three questions](https://jujin.dev/en/guides/shipping.md): ‘Deploy it’ is not a complete address.

## 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


## Requirements expression


## Architecture boundaries & dependencies


## Service decomposition


## Abstract collections


## Sequential storage structures


## Processing order


## Static site generators


## Web UI development tools


## Game engines


## Hosting execution models


## Release replacement


## Column composition


## Content arrangement


## Styles


## Typeface shapes


## Character width


## Revenue sources


## Billing methods


## Seller responsibility models


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