JobBoardWP: Custom fields on job posting form

functions.php

// Please replace 'my-custom-key' to your real meta key
// there can be more than 1 custom meta fields


function jb_custom_job_data( $data, $job_id ) {
	$data['my-custom-key'] = get_post_meta( $job_id, 'my-custom-key', true );
	return $data;
}
add_filter( 'jb-job-raw-data', 'jb_custom_job_data', 10, 2 );


function my_custom_validation( $posting_form, $user_id ) {
	if ( empty( $_POST['my-custom-key'] ) ) {
		$posting_form->add_error( 'my-custom-key', __( 'My custom field\'s label name cannot be empty', 'jobboardwp' ) );
	}
}
add_action( 'jb-job-submission-validation', 'my_custom_validation', 10, 2 );


function my_custom_job_data_submitted( $job_data, $posting_form ) {
	$job_data['meta_input']['my-custom-key'] = sanitize_text_field( $_POST['my-custom-key'] );
	return $job_data;
}
add_filter( 'jb_job_submitted_data', 'my_custom_job_data_submitted', 10, 2 );

// If you extends company data

function my_custom_user_company_data( $company_data, $user_id ) {
	$company_data['my_custom_key'] = get_user_meta( $user_id, 'jb_company_my_custom_key', true );
	return $company_data;
}
add_filter( 'jb-user-company-data', 'my_custom_user_company_data', 10, 2 );

function my_custom_job_company_data( $company_data, $job_id ) {
	$company_data['my_custom_key'] = get_post_meta( $job_id, 'jb-company-my_custom_key', true );
	return $company_data;
}
add_filter( 'jb-job-company-data', 'my_custom_job_company_data', 10, 2 );


function my_custom_save_user_company_data( $data, $job_id ) {
	$data['my_custom_key'] = sanitize_text_field( $_POST['company_my_custom_key'] );
	return $data;
}
add_filter( 'jb-save-job-user-company-data', 'my_custom_save_user_company_data', 10, 2 );

job-submission.php

/*line:41*/
$job_my_custom_key = '{default_value}'; // basic default value which we may show on the form after first loading
$company_my_custom_key = '{default_value}'; // basic default value which we may show on the form after first loading

/*line:61*/
if ( is_user_logged_in() ) {
	$c_data = JB()->common()->user()->get_company_data();
	
	/*...some other data above...*/
	$company_my_custom_key = $c_data['my_custom_key'];
	/*...some other data below...*/

}

/*line:71*/
if ( $edit ) {
	$data = JB()->common()->job()->get_raw_data( $jb_job_submission['job']->ID );	// getting job's data on edit
	/*...some other data above...*/
	$job_my_custom_key = $data['my-custom-key'];
	/*...some other data below...*/
}


/*line:223*/

$sections['job-details']['fields'][] = [
	'type'      => 'text', // can be 'hidden', 'media', 'text', 'location_autocomplete', 'password', 'select', 'conditional_radio', 'wp_editor
	'label'     => __( 'My custom key\'s label', 'jobboardwp' ),
	'id'        => 'my-custom-key',
	'required'  => true, // set true if required
	'value'     => $job_my_custom_key,
];

$sections['company-details']['fields'][] = [
	'type'      => 'text', // can be 'hidden', 'media', 'text', 'location_autocomplete', 'password', 'select', 'conditional_radio', 'wp_editor
	'label'     => __( 'Company My custom key\'s label', 'jobboardwp' ),
	'id'        => 'company_my_custom_key',
	'required'  => true, // set true if required
	'value'     => $company_my_custom_key,
];

Hi @L422Y

You may find the base file in wp-content/plugins/jobboardwp/templates/job-submission.php path. Then copy it to your theme/child-theme and then add necessary customizations.

Please take a look at this doc for more details and templates mapping. https://docs.jobboardwp.com/article/1570-templates-structure