So far I'm mostly limiting my search to organizations with single page applications, and unfortunately over time I've gotten comfortable with filling out applications through specific ATSes. So, for example if an employer uses Greenhouse, I know basically what to expect and how to fill stuff in.

Also, in case you didn't know, a job that shows up at for example boards.greenhouse.io may show up embedded at example.com/jobs?gh_jid=123 if you navigate to it through the employer's jobs page. It may not matter in the end but when that happens I prefer submitting through the example.com URL instead of the greenhouse.io URL. This is one reason I want a link directly to the employer's main site.