I have found that most technical people won't read a cover letter, HR will generally, but if there is an HR then it isn't an issue. Instead, use a quick 2-3 sentence description why you are applying and why you think you are a good fit.
And in the end it is a numbers game, as sebg pointed out, rinse and repeat.
I highly recommend customizing each note you send with your resume, don't ever use a "form" style. In the past I would even sometimes adjust my resume to highlight specific skills that are relevant, but that usually comes when you have a lot of varied experience and you need to draw peoples attention to specific skills.
And in the end it is a numbers game, as sebg pointed out, rinse and repeat.
I highly recommend customizing each note you send with your resume, don't ever use a "form" style. In the past I would even sometimes adjust my resume to highlight specific skills that are relevant, but that usually comes when you have a lot of varied experience and you need to draw peoples attention to specific skills.