I applied online. The process took 4 weeks.

• First was a call with the HR department, where we discussed my current position, my previous projects briefly, and Monzo itself.
• Then they failed to send me an invitation to my initial 30-minute interview with a developer. I've got a message from them that I missed the call, and they asked me to notify them if I was still interested in this role. We've scheduled another interview, and there were simple questions about Kafka and the scalability of systems.
• They sent me a home task which could be written in any language.
• Then there was an interview with 2 developers with screen sharing and describing the code.

After this call, I got a message that other developers wrote much stronger code and the interviewing process for me is over. They ignored my request to explain what could be improved, and I believe that the problem is that the task wasn't written in Go.

How do you understand what Kafka is?

What can be a bottleneck of your application?