Karen McGrane gave a great talk about just this issue. She made the very valid point that many employment portals are neglected backwaters and don't have mobile

Karen McGrane gave a great talk about just this issue. She made the very valid point that many employment portals are neglected backwaters and don't have mobile friendly or responsive designs, making them unusable on phones. That effectively cuts off employers from huge chunks of potential employees and verges on not being equal-opportunity employers.