So it seems I said all the right things at the interview yesterday. The company just called me and offered me a job.
I told them I'd need to think about it over the weekend, but it seems pretty likely that I'll soon be a senior developer for Bibliotech.
So if you suddenly decide that you want to offer me a job, now would be a good time to do it :)
Slack has it's appeal but there is something to be said for being paid on a regular basis