Tell how build automation, testing, and deployment are implemented in your previous project.

On the previous project, build, testing, and deployment automation was implemented using a CI/CD pipeline built on Jenkins.

1. Build: With each commit to the repository, Jenkins would run a build script that created a Python virtual environment, installed dependencies from requirements.txt, and assembled artifacts (such as packages or Docker images).

2. Testing: After building, automated tests were run using pytest. If the tests failed, the build was considered unsuccessful, and developers received notifications.

3. Deployment: Upon successful testing, Jenkins automatically deployed the application to a test server or staging environment. For production, a manual trigger with additional checks was used.

Example Jenkinsfile (simplified):

pipeline {
    agent any
    stages {
        stage('Build') {
            steps {
                sh 'python -m venv venv'
                sh './venv/bin/pip install -r requirements.txt'
            }
        }
        stage('Test') {
            steps {
                sh './venv/bin/pytest tests/'
            }
        }
        stage('Deploy') {
            when {
                branch 'main'
            }
            steps {
                sh './deploy.sh'
            }
        }
    }
}

Thus, the entire process from commit to deployment was highly automated, which improved the quality and speed of releasing new versions.