# Project export: Skill Chain

This document was generated by HackStack to give an AI agent context about a hackathon project. Sections are labeled with their provenance; content marked as truncated was cut to keep this document small.

## Project metadata

- Hackathon: Cal Hacks 10.0
- Tagline: Skill Chain aims to redefine the job application process, making it more secure, transparent, and efficient for both job seekers and employers.
- Devpost: https://devpost.com/software/skill-chain
- GitHub: https://github.com/Yash-kumar7/CalHacks2023
- Result: winner (Best Use of XRP Ledger)
- Team: 0 GitHub contributor(s) — 

## Devpost submission (written by the team)

### Inspiration

The inspiration for Skill Chain came from the desire to create a more efficient and serious job application process. We wanted to reduce spam and ensure that applicants are genuinely interested in the positions they apply for. The concept is similar to Tinder, but with a twist - it’s for job applications!

### What it does

Skill Chain is a blockchain-based platform where users pay to apply for jobs. The application fee is automatically deducted when a user decides to apply for a job. If the applicant is not selected (left-swiped by the recruiter), the money is refunded. This innovative approach reduces spam and ensures that only serious candidates apply.

### How we built it

We built Skill Chain using the XRP Ledger for blockchain transactions and smart contracts, ensuring a secure and transparent process. The backend REST API was developed using Java Spring Boot, providing robust and scalable server-side software. For the frontend, we used the Angular framework to create a user-friendly interface.

### Challenges we ran into

Implementing the blockchain transactions and smart contracts on the XRP Ledger was a significant challenge due to its complexity. Additionally, integrating the frontend with the backend while ensuring data consistency and security was also a hurdle we had to overcome.

### Accomplishments we're proud of

We’re proud of developing a unique solution that addresses a real-world problem. The successful integration of different technologies (blockchain, backend, and frontend) to create a cohesive platform is a significant achievement for us.

### What we learned

Through this project, we learned about the practical implementation of blockchain technology and smart contracts. We also gained experience in backend and frontend development, and how to integrate them effectively.

### What's next

The next step for Skill Chain is to incorporate more advanced features, such as AI-based matching of applicants to jobs. We also plan to expand our user base and collaborate with more companies to offer a wider range of job opportunities.

## README (from the GitHub repository)

Skill Chain aims to redefine the job application process, making it more secure, transparent, and efficient for both job seekers and employers.


## Detected evidence (automated analysis)

Indexed codebase: 85 recognized source files, 101 KB.
- Angular (technology) — detected in the code
- CSS (language) — detected in the code
- Express (technology) — detected in the code
- HTML (language) — detected in the code
- Java (language) — detected in the code
- JavaScript (language) — detected in the code
- TypeScript (language) — detected in the code
- MongoDB (technology) — claimed on Devpost, not found in the code
- Redis (technology) — claimed on Devpost, not found in the code

## Codebase structure (from repository index)

### Files (102 of 102)

```
backend/.gitignore
backend/pom.xml
backend/src/main/java/com/backend/controller/AuthController.java
backend/src/main/java/com/backend/controller/JobSeekerController.java
backend/src/main/java/com/backend/controller/RecruiterController.java
backend/src/main/java/com/backend/controller/RippleIntegration.java
backend/src/main/java/com/backend/controller/UserDetailsController.java
backend/src/main/java/com/backend/exception/UserAlreadyExistsException.java
backend/src/main/java/com/backend/redis/RedisConfig.java
backend/src/main/java/com/backend/repository/JobApplicationRepository.java
backend/src/main/java/com/backend/repository/JobPostingRepository.java
backend/src/main/java/com/backend/repository/UserRepository.java
backend/src/main/java/com/backend/security/CorsConfig.java
backend/src/main/java/com/backend/security/SecurityConfig.java
backend/src/main/java/com/backend/service/impl/JobApplicationServiceImpl.java
backend/src/main/java/com/backend/service/impl/JobPostingServiceImpl.java
backend/src/main/java/com/backend/service/impl/UserServiceImpl.java
backend/src/main/java/com/backend/service/JobApplicationService.java
backend/src/main/java/com/backend/service/JobPostingService.java
backend/src/main/java/com/backend/service/UserService.java
backend/src/main/java/com/backend/SpringBootApplication.java
backend/src/main/java/com/backend/user/AreaOfInterest.java
backend/src/main/java/com/backend/user/JobApplication.java
backend/src/main/java/com/backend/user/JobPosting.java
backend/src/main/java/com/backend/user/RecruiterDetails.java
backend/src/main/java/com/backend/user/User.java
backend/src/main/java/com/backend/user/UserDetails.java
backend/src/main/java/com/backend/user/UserType.java
backend/src/main/resources/application.properties
frontend/.gitignore
frontend/.vscode/extensions.json
frontend/.vscode/launch.json
frontend/.vscode/tasks.json
frontend/angular.json
frontend/package.json
frontend/README.md
frontend/src/app/app-routing.module.ts
frontend/src/app/app.component.css
frontend/src/app/app.component.html
frontend/src/app/app.component.spec.ts
frontend/src/app/app.component.ts
frontend/src/app/app.module.ts
frontend/src/app/child/child.component.css
frontend/src/app/child/child.component.html
frontend/src/app/child/child.component.spec.ts
frontend/src/app/child/child.component.ts
frontend/src/app/dashboard/dashboard.component.css
frontend/src/app/dashboard/dashboard.component.html
frontend/src/app/dashboard/dashboard.component.spec.ts
frontend/src/app/dashboard/dashboard.component.ts
frontend/src/app/employer/employerdashboard/employerdashboard.component.css
frontend/src/app/employer/employerdashboard/employerdashboard.component.html
frontend/src/app/employer/employerdashboard/employerdashboard.component.spec.ts
frontend/src/app/employer/employerdashboard/employerdashboard.component.ts
frontend/src/app/employer/employerdetails/employerdetails.component.css
frontend/src/app/employer/employerdetails/employerdetails.component.html
frontend/src/app/employer/employerdetails/employerdetails.component.spec.ts
frontend/src/app/employer/employerdetails/employerdetails.component.ts
frontend/src/app/employer/explorecandidates/explorecandidates.component.css
frontend/src/app/employer/explorecandidates/explorecandidates.component.html
frontend/src/app/employer/explorecandidates/explorecandidates.component.spec.ts
frontend/src/app/employer/explorecandidates/explorecandidates.component.ts
frontend/src/app/employer/jobposting/jobposting.component.css
frontend/src/app/employer/jobposting/jobposting.component.html
frontend/src/app/employer/jobposting/jobposting.component.spec.ts
frontend/src/app/employer/jobposting/jobposting.component.ts
frontend/src/app/employer/jobview/jobview.component.css
frontend/src/app/employer/jobview/jobview.component.html
frontend/src/app/employer/jobview/jobview.component.spec.ts
frontend/src/app/employer/jobview/jobview.component.ts
frontend/src/app/login/login.component.css
frontend/src/app/login/login.component.html
frontend/src/app/login/login.component.spec.ts
frontend/src/app/login/login.component.ts
frontend/src/app/login/style.scss
frontend/src/app/pagenotfound/pagenotfound.component.css
frontend/src/app/pagenotfound/pagenotfound.component.html
frontend/src/app/pagenotfound/pagenotfound.component.spec.ts
frontend/src/app/pagenotfound/pagenotfound.component.ts
frontend/src/app/router-guard/check-guard.ts
frontend/src/app/services/common.services.ts
frontend/src/app/sidebar/sidebar.component.css
frontend/src/app/sidebar/sidebar.component.html
frontend/src/app/sidebar/sidebar.component.spec.ts
frontend/src/app/sidebar/sidebar.component.ts
frontend/src/app/signup/signup.component.css
frontend/src/app/signup/signup.component.html
frontend/src/app/signup/signup.component.spec.ts
frontend/src/app/signup/signup.component.ts
frontend/src/assets/.gitkeep
frontend/src/assets/index.pug
frontend/src/assets/style.scss
frontend/src/index.html
frontend/src/main.ts
frontend/src/styles.css
frontend/tsconfig.app.json
frontend/tsconfig.json
frontend/tsconfig.spec.json
README.md
XRP/.gitignore
XRP/package.json
XRP/server.js
```

### Dependencies

- frontend/package.json: @angular-devkit/build-angular@^16.2.8, @angular/animations@^16.2.0, @angular/cli@^16.2.8, @angular/common@^16.2.0, @angular/compiler@^16.2.0, @angular/compiler-cli@^16.2.0, @angular/core@^16.2.0, @angular/forms@^16.2.0, @angular/platform-browser@^16.2.0, @angular/platform-browser-dynamic@^16.2.0, @angular/router@^16.2.0, @types/jasmine@~4.3.0, cors@^2.8.5, jasmine-core@~4.6.0, karma@~6.4.0, karma-chrome-launcher@~3.2.0, karma-coverage@~2.2.0, karma-jasmine@~5.1.0, karma-jasmine-html-reporter@~2.1.0, rxjs@~7.8.0, tslib@^2.3.0, typescript@~5.1.3, zone.js@~0.13.0
- XRP/package.json: cors@^2.8.5, crypto@^1.0.1, express@^4.18.2, five-bells-condition@^5.0.1, nodemon@^3.0.1, xrpl@^2.13.0

### Recent commits (newest first)

- Update application.properties
- adding frontend code
- adding backend code
- Update README.md
- Create README.md
- 'commit'

## Key source files (fetched from GitHub, selected and truncated for size)

### XRP/package.json

```
{
  "name": "xrp",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "dependencies": {
    "cors": "^2.8.5",
    "crypto": "^1.0.1",
    "express": "^4.18.2",
    "five-bells-condition": "^5.0.1",
    "nodemon": "^3.0.1",
    "xrpl": "^2.13.0"
  }
}

```

### frontend/package.json

```
{
  "name": "frontend",
  "version": "0.0.0",
  "scripts": {
    "ng": "ng",
    "start": "ng serve",
    "build": "ng build",
    "watch": "ng build --watch --configuration development",
    "test": "ng test"
  },
  "private": true,
  "dependencies": {
    "@angular/animations": "^16.2.0",
    "@angular/common": "^16.2.0",
    "@angular/compiler": "^16.2.0",
    "@angular/core": "^16.2.0",
    "@angular/forms": "^16.2.0",
    "@angular/platform-browser": "^16.2.0",
    "@angular/platform-browser-dynamic": "^16.2.0",
    "@angular/router": "^16.2.0",
    "cors": "^2.8.5",
    "rxjs": "~7.8.0",
    "tslib": "^2.3.0",
    "zone.js": "~0.13.0"
  },
  "devDependencies": {
    "@angular-devkit/build-angular": "^16.2.8",
    "@angular/cli": "^16.2.8",
    "@angular/compiler-cli": "^16.2.0",
    "@types/jasmine": "~4.3.0",
    "jasmine-core": "~4.6.0",
    "karma": "~6.4.0",
    "karma-chrome-launcher": "~3.2.0",
    "karma-coverage": "~2.2.0",
    "karma-jasmine": "~5.1.0",
    "karma-jasmine-html-reporter": "~2.1.0",
    "typescript": "~5.1.3"
  }
}

```

### XRP/server.js

```javascript
const xrpl = require("xrpl");
const crypto = require('crypto');
const cc = require('five-bells-condition')
const express = require('express');
const app = express();

app.use(express.json());

app.get('/api', (req, res) => {
    res.status(200).json({"msg":"hello from api"});
    console.log('Hello World from shane api')
})

app.get('/api/makeaccount', async(req, res) => {
    const client = new xrpl.Client("wss://s.altnet.rippletest.net:51233")
    await client.connect()
    const fund_result = await client.fundWallet()
    const client_wallet = fund_result.wallet
    console.log(client_wallet)
    res.status(200).json({"s_key": client_wallet.seed});
})

app.post('/api/jobinterest', async(req, res) => {
    const {s_key_user, s_key_comp} = req.body
    console.log(s_key_user, s_key_comp);

    const client = new xrpl.Client("wss://s.altnet.rippletest.net:51233")
    await client.connect()
    const client_wallet = xrpl.Wallet.fromSeed(s_key_user)
    const company_wallet = xrpl.Wallet.fromSeed(s_key_comp)
  
    // Construct condition and fulfillment ---------------------------------------
    const preimageData = crypto.randomBytes(32);
    const myFulfillment = new cc.PreimageSha256();
    myFulfillment.setPreimage(preimageData);
    const conditionHex = myFulfillment.getConditionBinary().toString('hex').toUpperCase();

    // Set the escrow finish time --------------------------------------------------
    let finishAfter = new Date((new Date().getTime() / 1000)); // 0 day from now
    finishAfter = new Date(finishAfter * 1000);
    console.log("This escrow will finish after: ", finishAfter);


    console.log('Condition:', conditionHex);
    console.log('Fulfillment:', myFulfillment.serializeBinary().toString('hex').toUpperCase());

    // Prepare transaction -------------------------------------------------------
    const prepared = await client.autofill({
        "TransactionType": "EscrowCreate",
        "Account": /* "rwUovZSYAD6DtgAmMR3VxC8TtZAcHrJPLm", */  client_wallet.address,
        "Amount": xrpl.xrpToDrops("5"),
        "Destination": /* "rQDQytvKuTQ4MrvCBmo5f1WnZkV1dQuwox",  */ company_wallet.address,
        // "DestinationTag": 2023,
        "Condition": conditionHex,
        // "Fee": "12",
        "CancelAfter": xrpl.isoTimeToRippleTime(finishAfter.toISOString()), 
    })

    const max_ledger = prepared.LastLedgerSequence
    console.log("Prepared transaction instructions:", prepared)
    console.log("Transaction cost:", xrpl.dropsToXrp(prepared.Fee), "XRP")
    console.log("Transaction expires after ledger:", max_ledger)

    
    // Sign prepared instructions ------------------------------------------------
    const signed = client_wallet.sign(prepared)
    console.log("Identifying hash:", signed.hash)
    console.log("Signed blob:", signed.tx_blob)
    
    // Submit signed blob --------------------------------------------------------
    try {
        const submit_result = await client.submitAndWait(signed.tx_blob)
        const escrowSeq = submit_result.result.Sequence
        // submitAndWait() doesn't return until the transaction has a final result.
        // Raises XrplError if the transaction doesn't get confirmed by the network.
        // Does not handle disaster recovery.
        console.log("Transaction result:", submit_result)
        res.status(200).json({"msg":"transaction done", "escrowSeq": escrowSeq});
    } catch(err) {
        console.log("Error submitting transaction:", err)
        res.status(400).json({"msg":"transaction faiiled"});
    }

    // Disconnect when done (If you omit this, Node.js won't end the process)
    client.disconnect()
})

app.post('/api/jobdecisionchecked', async(req, res) => {
    const {s_key_user, sequence_num} = req.body

    const client = new xrpl.Client("wss://s.altnet.rippletest.net:51233")
    await client.connect()
    const client_wallet = xrpl.Wallet.fromSeed(s_key_user)

    const prepared = await client.autofill({
        "Account": client_wallet.address,
        "TransactionType": "EscrowCancel",
        "Owner": client_wallet.address,
        "OfferSequence": sequence_num,
    })

    const max_ledger = prepared.LastLedgerSequence
    console.log("Prepared transaction instructions:", prepared)
    console.log("Transaction cost:", xrpl.dropsToXrp(prepared.Fee), "XRP")
    console.log("Transaction expires after ledger:", max_ledger)

    
    // Sign prepared instructions ------------------------------------------------
    const signed = client_wallet.sign(prepared)
    console.log("Identifying hash:", signed.hash)
    console.log("Signed blob:", signed.tx_blob)
    
    // Submit signed blob --------------------------------------------------------
    try {
        const submit_result = await client.submitAndWait(signed.tx_blob)
        // submitAndWait() doesn't return until the transaction has a final result.
        // Raises XrplError if the transaction doesn't get confirmed by the network.
        // Does not handle disaster recovery.
        console.log("Transaction result:", submit_result)
        res.status(200).json({"msg":"transaction calcelation done"});
    } catch(err) {
        console.log("Error submitting transaction:", err)
        res.status(400).json({"msg":"transaction calcelation failed"});
    }

    // Disconnect when done (If you omit this, Node.js won't end the process)
    client.disconnect()
})

app.listen(4000, () => {
    console.log('Server listening on port 4000');  
});
```

### frontend/src/main.ts

```typescript
import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';

import { AppModule } from './app/app.module';


platformBrowserDynamic().bootstrapModule(AppModule)
  .catch(err => console.error(err));

```

### backend/pom.xml

```xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.7.18-SNAPSHOT</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>
	<groupId>com</groupId>
	<artifactId>backend</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<name>backend</name>
	<description>Project for hackathon</description>
	<properties>
		<java.version>11</java.version>
	</properties>
	<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-security</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-data-mongodb</artifactId>
		</dependency>

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-data-redis</artifactId>
		</dependency>

		<dependency>
			<groupId>redis.clients</groupId>
			<artifactId>jedis</artifactId>
		</dependency>

		<dependency>
			<groupId>org.hibernate.validator</groupId>
			<artifactId>hibernate-validator</artifactId>
		</dependency>

		<dependency>
		<groupId>org.apache.httpcomponents</groupId>
		<artifactId>httpclient</artifactId>
	</dependency>

		<dependency>
			<groupId>com.google.code.gson</groupId>
			<artifactId>gson</artifactId>
		</dependency>

		<dependency>
			<groupId>org.projectlombok</groupId>
			<artifactId>lombok</artifactId>
			<optional>true</optional>
		</dependency>

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>
        <dependency>
            <groupId>org.jetbrains</groupId>
            <artifactId>annotations</artifactId>
            <version>RELEASE</version>
            <scope>compile</scope>
        </dependency>
        <dependency>
            <groupId>com.jayway.jsonpath</groupId>
            <artifactId>json-path</artifactId>
        </dependency>
		<dependency>
			<groupId>com.jayway.jsonpath</groupId>
			<artifactId>json-path</artifactId>
		</dependency>
	</dependencies>

	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
		</plugins>
	</build>
	<repositories>
		<repository>
			<id>spring-milestones</id>
			<name>Spring Milestones</name>
			<url>https://repo.spring.io/milestone</url>
			<snapshots>
				<enabled>false</enabled>
			</snapshots>
		</repository>
		<repository>
			<id>spring-snapshots</id>
			<name>Spring Snapshots</name>
			<url>https://repo.spring.io/snapshot</url>
			<releases>
				<enabled>false</enabled>
			</releases>
		</repository>
	</repositories>
	<pluginRepositories>
		<pluginRepository>
			<id>spring-milestones</id>
			<name>Spring Milestones</name>
			<url>https://repo.spring.io/milestone</url>
			<snapshots>
				<enabled>false</enabled>
			</snapshots>
		</pluginRepository>
		<pluginRepository>
			<id>spring-snapshots</id>
			<name>Spring Snapshots</name>
			<url>https://repo.spring.io/snapshot</url>
			<releases>
				<enabled>false</enabled>
			</releases>
		</pluginRepository>
	</pluginRepositories>

</project>

```

### frontend/src/index.html

```html
<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>CalHacks FrontEnd</title>
  <base href="/">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="icon" type="image/x-icon" href="assets/logo.png">
</head>
<body>
  <app-root></app-root>
</body>
</html>

```

### frontend/src/styles.css

```css


@import url('https://fonts.googleapis.com/css?family=Raleway:400,700');

* {
	box-sizing: border-box;
	margin: 0;
	padding: 0;	
	font-family: Raleway, sans-serif;
}

body {
	background: linear-gradient(90deg, #C7C5F4, #776BCC);		
}

.container {
	display: flex;
	align-items: center;
	justify-content: center;
	min-height: 100vh;
}

.screen {		
	background: linear-gradient(90deg, #5D54A4, #7C78B8);		
	position: relative;	
	height: 600px;
	width: 360px;	
	box-shadow: 0px 0px 24px #5C5696;
}

.screen__content {
	z-index: 1;
	position: relative;	
	height: 100%;
}

.screen__background {		
	position: absolute;
	top: 0;
	left: 0;
	right: 0;
	bottom: 0;
	z-index: 0;
	-webkit-clip-path: inset(0 0 0 0);
	clip-path: inset(0 0 0 0);	
}

.screen__background__shape {
	transform: rotate(45deg);
	position: absolute;
}

.screen__background__shape1 {
	height: 520px;
	width: 520px;
	background: #FFF;	
	top: -50px;
	right: 120px;	
	border-radius: 0 72px 0 0;
}

.screen__background__shape2 {
	height: 220px;
	width: 220px;
	background: #6C63AC;	
	top: -172px;
	right: 0;	
	border-radius: 32px;
}

.screen__background__shape3 {
	height: 540px;
	width: 190px;
	background: linear-gradient(270deg, #5D54A4, #6A679E);
	top: -24px;
	right: 0;	
	border-radius: 32px;
}

.screen__background__shape4 {
	height: 400px;
	width: 200px;
	background: #7E7BB9;	
	top: 420px;
	right: 50px;	
	border-radius: 60px;
}

.login {
	width: 320px;
	padding: 30px;
	padding-top: 156px;
}

.login__field {
	padding: 20px 0px;	
	position: relative;	
}

.login__icon {
	position: absolute;
	top: 30px;
	color: #7875B5;
}

.login__input {
	border: none;
	border-bottom: 2px solid #D1D1D4;
	background: none;
	padding: 10px;
	padding-left: 24px;
	font-weight: 700;
	width: 75%;
	transition: .2s;
}

.login__input:active,
.login__input:focus,
.login__input:hover {
	outline: none;
	border-bottom-color: #6A679E;
}

.login__submit {
	background: #fff;
	font-size: 14px;
	margin-top: 30px;
	padding: 16px 20px;
	border-radius: 26px;
	border: 1px solid #D4D3E8;
	text-transform: uppercase;
	font-weight: 700;
	display: flex;
	align-items: center;
	width: 100%;
	color: #4C489D;
	box-shadow: 0px 2px 2px #5C5696;
	cursor: pointer;
	transition: .2s;
}

.login__submit:active,
.login__submit:focus,
.login__submit:hover {
	border-color: #6A679E;
	outline: none;
}

.button__icon {
	font-size: 24px;
	margin-left: auto;
	color: #7875B5;
}

.social-login {	
	position: absolute;
	height: 140px;
	width: 160px;
	text-align: center;
	bottom: 0px;
	right: 0px;
	color: #fff;
}

.social-icons {
	display: flex;
	align-items: center;
	justify-content: center;
}

.social-login__icon {
	padding: 20px 10px;
	color: #fff;
	text-decoration: none;	
	text-shadow: 0px 0px 8px #7875B5;
}

.social-login__icon:hover {
	transform: scale(1.5);	
}
```

### frontend/src/app/app-routing.module.ts

```typescript
import { NgModule } from '@angular/core';
import { RouterModule, Routes } from '@angular/router';

const routes: Routes = [];

@NgModule({
  imports: [RouterModule.forRoot(routes)],
  exports: [RouterModule]
})
export class AppRoutingModule { }

```

### frontend/src/app/app.component.ts

```typescript
import { Component } from '@angular/core';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})
export class AppComponent {
  title = 'frontend';
  constructor() {}

  // Function to toggle the sidebar
  toggleSidebar() {
    // You can implement the logic here to open or close the sidebar
    // You may use an Angular service or Input/Output to communicate with the sidebar component
  }
}

```

### frontend/src/app/app.component.html

```html
<!-- <div class="app-container">
  <app-sidebar></app-sidebar>
  <div class="content">
    <router-outlet></router-outlet>
  </div>
</div> 
<div class="header">
  <button (click)="toggleSidebar()">☰</button>
  <h1>MatchIntern</h1>
</div>

<div class="sidebar">
  <ul>
    <li><a routerLink="/home">Home</a></li>
    <li><a routerLink="/about">About</a></li>
    <li><a routerLink="/services">Services</a></li>
    <li><a routerLink="/contact">Contact</a></li>
  </ul>
</div>-->

<div class="content">
  <router-outlet></router-outlet>
</div>
```

[70 more indexed source files omitted to keep this export small. The full file list is in the Codebase structure section above.]