If you work a lot with WordPress, it is always better to put the results into variables and then output them at the end, so you can use a filter.

That's why I would do it the same way Mark does. So always a single if, also because it is easier to read for others.

For all who work with PHP and WordPress, something like this could look like this:

/**
 * Here we define the description for the job names and output them.
 *
 * @param string $job_name
 * 
 * @return string
 */
function get_job_description( $job_name ) {

    $job_description = "I'm not sure, I'd google it";

    if ( 'painter' === $job_name ) {
        $job_description = 'Paints on canvas for art lovers';
    }

    if ( 'developer' === $job_name ) {
        $job_description = 'Writes code which runs on machines';
    }

    return apply_filters( 'job_description', $job_description, $job_name );
}

/**
 * Now other users can use WordPress for their projects, change or extend the description.
 * 
 * @param string $job_description
 * @param string $job_name
 *
 * @return string
 */ 
add_filter( 'job_description', function( $job_description, $job_name ) {

    if ( 'gamer' === $job_name ) {
        $job_description = 'Is a gamer and plays on pc master race';
    }

    return $job_description;
}, 10, 2 );

Well, I always try to build in a way that others with hooks can rework the function and read it at any time. Hence the individual IF blocks.