It looks like the cofounders of Outco, an interview prep bootcamp, have cofounded Apply Pass. They have also recruited some Outco employees to work at Apply Pass. Apply Pass is some kind of platform that automates the job application process for software engineer jobs.

I haven't used Exponent myself enough, but it's not a competitor to these services I mentioned above. Disclosure, my co-founder does know the founder of Exponent. It's a good complement for a more expensive high touch service like the above. Perhaps competing with Udemy DS&A courses, or Structy, or other cheaper monthly tools. Their mock interviews are competitive with Interviewing.io so I would look at them for one off interviews perhaps. My opinion is their core emphasis is more in PM than SWE but they do have modules for SWEs too.