You’re going to have way better luck if you tap your network and bypass the generic “apply here” submission queue.

Beyond that, for most companies I’m familiar with are feeding your application into a system. Submitting for a ton of roles is likely not getting you anything different than submitting for one and then having the recruiter route you to the best fit.

I believe you can apply over and over again for SWE jobs, there are lots of open positions but a few are hiring.

If you don't have any reference, you can contact directly to the recruiter