Give user Job or Resume Visibility Package on registration when using WP Job Manager Packages addon

functions.php

<?php
add_action( 'user_register', 'give_wpjmp_vis_job_user_package_on_registration' );
add_action( 'user_register', 'give_wpjmp_vis_resume_user_package_on_registration' );

/**
 * Give user custom Job Visibility Package on registration
 *
 *
 * @since @@version
 *
 * @param $user_id
 */
function give_wpjmp_vis_job_user_package_on_registration( $user_id ) {

	global $wpdb;

	if ( wpjmp_give_pack_check_user_role( 'employer', $user_id ) ) {
		$wpdb->insert(
			"{$wpdb->prefix}wpjmpack_user_packages",
			array(
				'user_id'          => $user_id,
				'product_id'       => 0,  // This should be set to the ID of a package in WooCommerce if you want it to show a package name!
				'package_type' => 'job_listing', // job_listing for job packages, resume for resume packages
				'handler'      => 'woocommerce', // !!! DO NOT CHANGE THIS VALUE !!!
				// Browse is either enabled or disabled (no limits exist for browse)
				'allow_browse' => 1, // 1 for enable - 0 for disable
				// Apply can have a limit if specified, otherwise set to zero (0) for unlimited
				'allow_apply'  => 1, // 1 for enable - 0 for disable
				'apply_limit'  => 5, // 0 for unlimited, this example sets it to max of 5 applications before requiring new package
				// View can have a limit if specified, otherwise set to zero (0) for unlimited
				'allow_view'   => 1, // 1 for enable - 0 for disable
				'view_limit'   => 0, // 0 for unlimited
			)
		);

	}
}

/**
 * Give user custom Resume Visibility Package on registration
 *
 *
 * @since @@version
 *
 * @param $user_id
 */
function give_wpjmp_vis_resume_user_package_on_registration( $user_id ) {

	global $wpdb;

	if ( wpjmp_give_pack_check_user_role( 'candidate', $user_id ) ) {
		$wpdb->insert(
			"{$wpdb->prefix}wpjmpack_user_packages",
			array(
				'user_id'      => $user_id,
				'product_id'   => 0,  // This should be set to the ID of a package in WooCommerce if you want it to show a package name!
				'package_type' => 'resume', // job_listing for job packages, resume for resume packages
				'handler'      => 'woocommerce', // !!! DO NOT CHANGE THIS VALUE !!!
				// Browse is either enabled or disabled (no limits exist for browse)
				'allow_browse' => 1, // 1 for enable - 0 for disable
				// Apply can have a limit if specified, otherwise set to zero (0) for unlimited
				'allow_contact' => 1, // 1 for enable - 0 for disable
				'contact_limit'  => 0, // 0 for unlimited
				// View can have a limit if specified, otherwise set to zero (0) for unlimited
				'allow_view'   => 1, // 1 for enable - 0 for disable
				'view_limit'   => 5, // 0 for unlimited, this example sets it to max of 5 resume views before requiring new package
				// View name can have a limit if specified, otherwise set to zero (0) for unlimited
				'allow_view_name'   => 1, // 1 for enable - 0 for disable
				'view_name_limit'   => 0, // 0 for unlimited
			)
		);

	}
}

/**
 * Check if user has specific role
 *
 *
 * @since @@version
 *
 * @param      $role
 * @param null $user_id
 *
 * @return bool
 */
function wpjmp_give_pack_check_user_role( $role, $user_id = null ) {

	if ( is_numeric( $user_id ) ) {
		$user = get_userdata( $user_id );
	} else {
		$user = wp_get_current_user();
	}

	if ( empty( $user ) ) {
		return false;
	}

	return in_array( $role, (array) $user->roles );
}

Example code for giving only Job Packages: https://gist.github.com/tripflex/140bfa98527080da16a2341954609c85