I applied through a recruiter. The process took 3 weeks. I interviewed at Aiven (Sydney) in Feb 2021
Interview
There are 5 stages in interview process in 3 weeks. Basically most questions are easy to answer.
I suggest they advertise job title as python software engineer that could mostly fit to their interview questions.
Interview questions [1]
Question 1
Lots questions are about software engineering such as asking what is deadlock, garbage collector and concurrency. Also includes an assignment homework and live troubleshooting.