We've had over 500 resumes in just over a week for a job opening, so I've been reviewing a lot more resumes and had some more thoughts, in addition to this thread. As always, resume and interview advice is just one woman's opinion, take it or leave it, but in case it's helpful... https://twitter.com/creynoldsnc/status/946470954456244225
When applying for a job, follow the instructions to the letter. If they ask for a cover letter, one sentence in an email isn't enough. If they want things attached, send as an attachment. If they ask you to send to a certain email address, do so.
Read the job description and research the organization. You should address the organization and what they're listening to specifically in your cover letter. Why do you want to work THERE (not just anywhere)? Why are you perfect for this specific job?
(This one really matters. I read a few applications from Republicans who clearly didn't know what EMILY's List does and didn't want this job in particular.)
Your cover letter is your opportunity to sell yourself. It shouldn't be too long or too lofty, but it should show that you can write and it should address and challenge any ways in which your resume might make it seem like you're not a perfect fit.
In addition to doing your research, pay attention to the little details. For example, we're EMILY's List, not Emily's List. It's not a disqualifier, but it's always better to get it right and show that you're detail-oriented and working to get it right.
Just a matter of opinion, but send attachments, not links. Most IT folks have trained people well not to open unsolicited links.
Know that hiring ALWAYS takes longer than you or the employer want it to take. I've gotten emails asking for updates a few days or a week in, and with a ton of applicants, it just adds to the incoming and doesn't help us get to you faster.
Keep paying close attention to those instructions as the process moves on. If you're given a deadline for a next step (for example, a writing test), flag ASAP if you can't meet that deadline and do everything you can not to miss it.
Most important: did you see earlier where we got several hundred applicants for one job? Job hunting is hard. If you don't get this one, you WILL get one down the road. Remember that not getting THIS job doesn't mean you're not terrific and destined for something great. You are.