If a job posting includes any contact information (even a stock company signature block), use it. Submit your application through the website, sure, but then also send an email or call the recruiter who posted it. Talk about specifics of the job posting (“I was excited to see that this is for the education sector. I would love to be part of improving online learning tools. I actually am part of an amazing open source education platform called Free Code Camp”). Ask for more information. Include your resume but also hit the high points in your email (or conversation).