I applied online. The process took 3 weeks. I interviewed at Fly.io (Madrid) in Oct 2023
Interview
They give you access to a private repository where you have to fix a piece of code following their requirements and then you need to respond to some questions related to troubleshooting and your approach to face problems and users/customers requests.
Interview questions [1]
Question 1
How to fix a Ruby project that is unfinished to make it send a test email.