I applied online, and the process took two weeks.
The process was:
I only made it to the HM interview, and the dude really made it seem like he was only working there in hopes that the fusion energy, if successful, would leave him rich. The rejection email said that nothing that I said in projects was impressive and that I didn't know how to navigate through problems as an engineer. This is a junior position too. It was a very blunt rejection, but it seems about right for a startup wanting to advance into probably an IPO stage.
We talked about my projects, what I did, and how I work around deadlines.
The following metrics were computed from 1 interview experience for the Helion Energy Firmware Engineer role.
Helion Energy's interview process for their Firmware Engineer roles is extremely selective, failing the vast majority of engineers.
Candidates reported having very negative feelings for Helion Energy's Firmware Engineer interview process.