Start by not calling them Snr Engs. That makes it sound like you don't value them and view them as a comodity that you can't be arsed to write out completely. Not to mention, it won't come up in a search when active, motivated candidates are looking for new opportunities.
This is not just a nitpick. If someone emailed me looking for a "Snr Eng", the email is getting deleted and flagged as spam.