# virtual424/job-listings-frontend-mentor- architecture

> Architecture diagram of the GitHub repository virtual424/job-listings-frontend-mentor-, generated by GitDiagram from its file tree, README and a sample of source files (last updated 2026-06-14). It is an AI-made overview: check details against the source.

- Interactive diagram: https://gitdiagram.com/virtual424/job-listings-frontend-mentor-
- Repository: https://github.com/virtual424/job-listings-frontend-mentor-

## Overview

1. **Project type**
   - This is a single-page, browser-only frontend challenge: a job listings board with category filtering.
   - There is no backend, API server, or build pipeline visible in the repo; the app runs from `index.html` with client-side CSS and JavaScript.

2. **Entry points**
   - `index.html` is the main document and the top-level structure for the page.
   - `style.css` provides all visual styling and responsive layout.
   - `index.js` contains the interactive behavior, primarily filtering and possibly rendering.

3. **Core UI regions**
   - The page is centered around a list of job cards.
   - Each job card presents company/job metadata and a set of filterable tags.
   - The UI likely also includes a “selected filters” area or control strip that appears once filters are chosen, since the challenge requires accumulating multiple active filters.

4. **Data layer**
   - `data.json` is included as an alternate data source for the same job listings content.
   - The README explicitly supports two implementation styles:
     - hardcoded listings in HTML using `data-*` attributes, or
     - dynamic rendering from `data.json`.
   - If `data.json` is used, the browser JS becomes the boundary that transforms raw job objects into DOM nodes.

5. **Filtering behavior**
   - The main interaction is tag-based filtering by role, level, language, and tool.
   - Selecting a tag adds it to the active filter set.
   - The displayed listings should be reduced to only those containing all selected filters, so the logic is an intersection match rather than a loose “any tag” search.

6. **State management**
   - The application state is small and likely lives entirely in memory in `index.js`.
   - The key state is the current list of active filters and the current visible job cards.
   - Clearing or removing a filter should trigger re-evaluation of the visible listings.

7. **Presentation and responsiveness**
   - `style.css` handles the desktop/mobile layout differences called out in the challenge.
   - The design assets in `design/` and images in `images/` provide the visual reference and icons/backgrounds.
   - Hover states are part of the interactive surface, so CSS is responsible for visual feedback on filter chips and any clickable controls.

8. **Design-system inputs**
   - `style-guide.md` likely defines the palette, typography, and spacing conventions used to match the Frontend Mentor mockup.
   - This acts as the visual contract between the static assets and the final implementation.

9. **Content and asset boundaries**
   - `images/` contains optimized static assets such as logos, backgrounds, and icons.
   - `design/` is reference-only and not part of runtime behavior.
   - These assets feed the UI layer but do not affect application logic.

10. **Likely runtime flow**
   - Browser loads `index.html`.
   - CSS applies the base and responsive layout.
   - JS either reads existing job markup or fetches/uses `data.json`, attaches click handlers to tags, and updates the DOM based on selected filters.
   - The visual result is a static-feeling interface with client-side filtering only.

11. **Architectural boundary to diagram**
   - The simplest diagram would show three layers:
     - static content/data (`index.html` and/or `data.json`)
     - interaction logic (`index.js`)
     - presentation (`style.css` plus assets from `images/`)
   - Everything happens inside the browser; there are no external services or persistent storage concerns.

Main entry points: [`index.js`](https://github.com/virtual424/job-listings-frontend-mentor-/blob/main/index.js) (Interaction logic), [`style.css`](https://github.com/virtual424/job-listings-frontend-mentor-/blob/main/style.css) (Stylesheet), [`index.html`](https://github.com/virtual424/job-listings-frontend-mentor-/blob/main/index.html) (Page shell), [`data.json`](https://github.com/virtual424/job-listings-frontend-mentor-/blob/main/data.json) (Job data)

## Diagram (Mermaid)

```mermaid
flowchart TD

subgraph group_presentation["Presentation"]
  node_board["Jobs board<br/>listing UI"]
  node_cards["Job cards<br/>listing items"]
  node_filters["Filter bar<br/>ui state"]
  node_css["Stylesheet<br/>css<br/>[style.css]"]
end

subgraph group_interaction["Interaction"]
  node_js["Interaction logic<br/>client script<br/>[index.js]"]
  node_state(("Active filters<br/>in-memory state"))
  node_match{{"Filter match<br/>predicate"}}
end

subgraph group_content["Content"]
  node_html["Page shell<br/>document<br/>[index.html]"]
  node_data[("Job data<br/>listings dataset<br/>[data.json]")]
end

subgraph group_assets["Assets"]
  node_guide["Style guide<br/>design spec<br/>[style-guide.md]"]
  node_images["Images<br/>static assets"]
  node_design["Mockup refs<br/>design assets"]
end

node_browser(("Browser app<br/>frontend runtime"))

node_browser -->|"loads"| node_html
node_browser -->|"applies"| node_css
node_browser -->|"executes"| node_js
node_html -->|"contains"| node_board
node_html -->|"uses"| node_images
node_board -->|"renders"| node_cards
node_board -->|"shows"| node_filters
node_js -->|"tracks"| node_state
node_js -->|"evaluates"| node_match
node_js -->|"updates"| node_cards
node_js -.->|"reads"| node_data
node_data -->|"feeds"| node_cards
node_state -->|"drives"| node_filters
node_match -->|"narrows"| node_cards
node_css -->|"styles"| node_board
node_css -->|"styles"| node_filters
node_css -->|"uses"| node_images
node_guide -.->|"informs"| node_css
node_design -.->|"references"| node_guide

click node_html "https://github.com/virtual424/job-listings-frontend-mentor-/blob/main/index.html"
click node_js "https://github.com/virtual424/job-listings-frontend-mentor-/blob/main/index.js"
click node_data "https://github.com/virtual424/job-listings-frontend-mentor-/blob/main/data.json"
click node_css "https://github.com/virtual424/job-listings-frontend-mentor-/blob/main/style.css"
click node_guide "https://github.com/virtual424/job-listings-frontend-mentor-/blob/main/style-guide.md"
click node_images "https://github.com/virtual424/job-listings-frontend-mentor-/tree/main/images"
click node_design "https://github.com/virtual424/job-listings-frontend-mentor-/tree/main/design"

classDef toneNeutral fill:#f8fafc,stroke:#334155,stroke-width:1.5px,color:#0f172a
classDef toneBlue fill:#dbeafe,stroke:#2563eb,stroke-width:1.5px,color:#172554
classDef toneAmber fill:#fef3c7,stroke:#d97706,stroke-width:1.5px,color:#78350f
classDef toneMint fill:#dcfce7,stroke:#16a34a,stroke-width:1.5px,color:#14532d
classDef toneRose fill:#ffe4e6,stroke:#e11d48,stroke-width:1.5px,color:#881337
classDef toneIndigo fill:#e0e7ff,stroke:#4f46e5,stroke-width:1.5px,color:#312e81
classDef toneTeal fill:#ccfbf1,stroke:#0f766e,stroke-width:1.5px,color:#134e4a
class node_board,node_cards,node_filters,node_css toneBlue
class node_js,node_state,node_match toneAmber
class node_html,node_data toneMint
class node_guide,node_images,node_design toneRose
class node_browser toneNeutral
```

## Components

### Presentation

Visual structure and styling

- **Jobs board**: listing UI · Main listings surface where jobs and filters are shown
- **Job cards**: listing items · Repeated job entry cards with metadata and tags
- **Filter bar**: ui state · Selected filters and clear/remove controls
- [Stylesheet](https://github.com/virtual424/job-listings-frontend-mentor-/blob/main/style.css): css · Responsive layout, visual styling, and hover states · `style.css`

### Interaction

Client-side behavior and state

- [Interaction logic](https://github.com/virtual424/job-listings-frontend-mentor-/blob/main/index.js): client script · Handles filtering, selection, and DOM updates · `index.js`
- **Active filters**: in-memory state · Current set of selected filter tags
- **Filter match**: predicate · Intersection logic that keeps only listings containing all active filters

### Content

Markup and listing data

- [Page shell](https://github.com/virtual424/job-listings-frontend-mentor-/blob/main/index.html): document · Top-level document and static page structure · `index.html`
- [Job data](https://github.com/virtual424/job-listings-frontend-mentor-/blob/main/data.json): listings dataset · Alternate structured source for job listings content · `data.json`

### Assets

Static visuals and design references

- [Style guide](https://github.com/virtual424/job-listings-frontend-mentor-/blob/main/style-guide.md): design spec · Typography, color, and spacing reference for the challenge · `style-guide.md`
- [Images](https://github.com/virtual424/job-listings-frontend-mentor-/tree/main/images): static assets · Logos, icons, and other UI graphics · `images`
- [Mockup refs](https://github.com/virtual424/job-listings-frontend-mentor-/tree/main/design): design assets · Reference visuals for matching the provided challenge design · `design`

### Other components

- **Browser app**: frontend runtime · Single-page job listings challenge running entirely in the browser

## Connections

- Browser app → Page shell: loads · The browser opens the single-page document
- Browser app → Stylesheet: applies · Stylesheet drives the page presentation
- Browser app → Interaction logic: executes · Client script initializes interactivity
- Page shell → Jobs board: contains · Document lays out the listings interface
- Page shell → Images: uses · Markup references static visuals and icons
- Jobs board → Job cards: renders · The board is composed of repeated job cards
- Jobs board → Filter bar: shows · The board includes the active filter controls
- Interaction logic → Active filters: tracks · Script maintains the selected filter set in memory
- Interaction logic → Filter match: evaluates · Filtering logic decides which listings remain visible
- Interaction logic → Job cards: updates · Script shows and hides cards based on filter results
- Interaction logic → Job data: reads · Optional structured listing data source
- Job data → Job cards: feeds · Job objects are transformed into rendered cards
- Active filters → Filter bar: drives · Selected tags determine the visible filter bar
- Filter match → Job cards: narrows · Only cards matching all active filters remain visible
- Stylesheet → Jobs board: styles · Layout and responsive behavior for the main surface
- Stylesheet → Filter bar: styles · Visual feedback for chips and controls
- Stylesheet → Images: uses · Styling works with the static UI assets
- Style guide → Stylesheet: informs · Design tokens and spacing guide the stylesheet
- Mockup refs → Style guide: references · Mockups support the visual specification